diff --git a/ISSUE_TEMPLATE.md b/ISSUE_TEMPLATE.md
index 155ea8d3..b1ddccb1 100644
--- a/ISSUE_TEMPLATE.md
+++ b/ISSUE_TEMPLATE.md
@@ -1,12 +1,13 @@
-If you are reporting an issue that involves any JSX (e.g.
-<div>{`${example}`}</div>), PLEASE PLEASE PLEASE make sure you have properly
+*Requisite minimal reproducible example, formatted as plain text :*
+
+<hr>
+
+#### Optional: concerning jsx.
+PLEASE PLEASE PLEASE make sure you have properly
 setup and are sourcing this plugin https://github.com/mxw/vim-jsx
 
 WE DO NOT support JSX automatically, you need another plugin to add get this
 functionality.
 
-If applicable, include a snippet of code that we can easily copy and paste that
-replicates your bug.
-
 Make sure the bug still exists if you disable all other javascript plugins
 except the one noted above, mxw/vim-jsx
diff --git a/README.md b/README.md
index 08ccdfed..81accf8c 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,12 @@ improved indentation.
 
 ## Installation
 
+### Install with native package manager
+
+      git clone https://github.com/pangloss/vim-javascript.git ~/.vim/pack/vim-javascript/start/vim-javascript
+
+since Vim 8.
+
 ### Install with [pathogen](https://github.com/tpope/vim-pathogen)
 
       git clone https://github.com/pangloss/vim-javascript.git ~/.vim/bundle/vim-javascript
@@ -51,14 +57,18 @@ Default Value: 0
 
 -----------------
 
-```
-set foldmethod=syntax
+```vim
+augroup javascript_folding
+    au!
+    au FileType javascript setlocal foldmethod=syntax
+augroup END
 ```
 
-Enables code folding based on our syntax file.
+Enables code folding for javascript based on our syntax file.
 
-Please note this can have a dramatic effect on performance and because it is a
-global vim option, we do not set it ourselves.
+Please note this can have a dramatic effect on performance. In some terminals
+this may cause hangs during pasting. If you are affected by this, using
+a different foldmethod (such as indent) may provide a better experience.
 
 
 ## Concealing Characters
@@ -96,7 +106,10 @@ OR if you wish to toggle concealing you may wish to bind a command such as the f
 * `:h cino-star`
 * `:h cino-(`
 * `:h cino-w`
+* `:h cino-W`
 * `:h cino-U`
+* `:h cino-m`
+* `:h cino-M`
 * `:h 'indentkeys'`
 
 ## Contributing
diff --git a/extras/flow.vim b/extras/flow.vim
index af883ac8..b34d7101 100644
--- a/extras/flow.vim
+++ b/extras/flow.vim
@@ -1,36 +1,42 @@
 syntax region  jsFlowDefinition     contained                        start=/:/    end=/\%(\s*[,=;)\n]\)\@=/ contains=@jsFlowCluster containedin=jsParen
 syntax region  jsFlowArgumentDef    contained                        start=/:/    end=/\%(\s*[,)]\|=>\@!\)\@=/ contains=@jsFlowCluster
-syntax region  jsFlowArray          contained matchgroup=jsFlowNoise start=/\[/   end=/\]/        contains=@jsFlowCluster
-syntax region  jsFlowObject         contained matchgroup=jsFlowNoise start=/{/    end=/}/         contains=@jsFlowCluster
-syntax region  jsFlowParens         contained matchgroup=jsFlowNoise start=/(/  end=/)/ contains=@jsFlowCluster
+syntax region  jsFlowArray          contained matchgroup=jsFlowNoise start=/\[/   end=/\]/        contains=@jsFlowCluster,jsComment fold
+syntax region  jsFlowObject         contained matchgroup=jsFlowNoise start=/{/    end=/}/         contains=@jsFlowCluster,jsComment fold
+syntax region  jsFlowExactObject    contained matchgroup=jsFlowNoise start=/{|/   end=/|}/       contains=@jsFlowCluster,jsComment fold
+syntax region  jsFlowParens         contained matchgroup=jsFlowNoise start=/(/  end=/)/ contains=@jsFlowCluster nextgroup=jsFlowArrow skipwhite keepend extend fold
 syntax match   jsFlowNoise          contained /[:;,<>]/
 syntax keyword jsFlowType           contained boolean number string null void any mixed JSON array Function object array bool class
-syntax keyword jsFlowTypeof         contained typeof skipempty skipempty nextgroup=jsFlowTypeCustom,jsFlowType
-syntax match   jsFlowTypeCustom     contained /[0-9a-zA-Z_.]*/ skipwhite skipempty nextgroup=jsFlowGroup
-syntax region  jsFlowGroup          contained matchgroup=jsFlowNoise start=/</ end=/>/ contains=@jsFlowCluster
-syntax region  jsFlowArrowArguments contained matchgroup=jsFlowNoise start=/(/  end=/)\%(\s*=>\)\@=/ oneline skipwhite skipempty nextgroup=jsFlowArrow contains=@jsFlowCluster
+syntax keyword jsFlowTypeof         contained typeof skipempty skipwhite nextgroup=jsFlowTypeCustom,jsFlowType
+syntax match   jsFlowTypeCustom     contained /[0-9a-zA-Z_.]*/ skipwhite skipempty nextgroup=jsFlowGeneric
+syntax region  jsFlowGeneric                  matchgroup=jsFlowNoise start=/\k\@<=</ end=/>/ contains=@jsFlowCluster containedin=@jsExpression,jsFlowDeclareBlock
+syntax region  jsFlowGeneric        contained matchgroup=jsFlowNoise start=/</ end=/>(\@=/ oneline contains=@jsFlowCluster containedin=@jsExpression,jsFlowDeclareBlock
+syntax region  jsFlowObjectGeneric  contained matchgroup=jsFlowNoise start=/\k\@<=</ end=/>/ contains=@jsFlowCluster nextgroup=jsFuncArgs
 syntax match   jsFlowArrow          contained /=>/ skipwhite skipempty nextgroup=jsFlowType,jsFlowTypeCustom,jsFlowParens
-syntax match   jsFlowMaybe          contained /?/ skipwhite skipempty nextgroup=jsFlowType,jsFlowTypeCustom,jsFlowParens,jsFlowArrowArguments,jsFlowObject,jsFlowReturnObject
 syntax match   jsFlowObjectKey      contained /[0-9a-zA-Z_$?]*\(\s*:\)\@=/ contains=jsFunctionKey,jsFlowMaybe skipwhite skipempty nextgroup=jsObjectValue containedin=jsObject
 syntax match   jsFlowOrOperator     contained /|/ skipwhite skipempty nextgroup=@jsFlowCluster
-syntax keyword jsFlowImportType     contained type skipwhite skipempty nextgroup=jsModuleAsterisk,jsModuleKeyword,jsModuleGroup
+syntax keyword jsFlowImportType     contained type typeof skipwhite skipempty nextgroup=jsModuleAsterisk,jsModuleKeyword,jsModuleGroup
 syntax match   jsFlowWildcard       contained /*/
 
-syntax match   jsFlowReturn         contained /:\s*/ contains=jsFlowNoise skipwhite skipempty nextgroup=@jsFlowReturnCluster
-syntax region  jsFlowReturnObject   contained matchgroup=jsFlowNoise start=/{/    end=/}/  contains=@jsFlowCluster skipwhite skipempty nextgroup=jsFuncBlock,jsFlowReturnOrOp
-syntax region  jsFlowReturnArray    contained matchgroup=jsFlowNoise start=/\[/   end=/\]/ contains=@jsFlowCluster skipwhite skipempty nextgroup=jsFuncBlock,jsFlowReturnOrOp
-syntax region  jsFlowReturnParens   contained matchgroup=jsFlowNoise start=/(/    end=/)/  contains=@jsFlowCluster skipwhite skipempty nextgroup=jsFuncBlock,jsFlowReturnOrOp
-syntax match   jsFlowReturnKeyword  contained /\k\+/ contains=jsFlowType,jsFlowTypeCustom skipwhite skipempty nextgroup=jsFlowReturnGroup,jsFuncBlock,jsFlowReturnOrOp
-syntax match   jsFlowReturnMaybe    contained /?/ skipwhite skipempty nextgroup=jsFlowReturnKeyword
+syntax match   jsFlowReturn         contained /:\s*/ contains=jsFlowNoise skipwhite skipempty nextgroup=@jsFlowReturnCluster,jsFlowArrow,jsFlowReturnParens
+syntax region  jsFlowReturnObject   contained matchgroup=jsFlowNoise start=/{/    end=/}/  contains=@jsFlowCluster skipwhite skipempty nextgroup=jsFuncBlock,jsFlowReturnOrOp extend fold
+syntax region  jsFlowReturnArray    contained matchgroup=jsFlowNoise start=/\[/   end=/\]/ contains=@jsFlowCluster skipwhite skipempty nextgroup=jsFuncBlock,jsFlowReturnOrOp fold
+syntax region  jsFlowReturnParens   contained matchgroup=jsFlowNoise start=/(/    end=/)/  contains=@jsFlowCluster skipwhite skipempty nextgroup=jsFuncBlock,jsFlowReturnOrOp,jsFlowReturnArrow fold
+syntax match   jsFlowReturnArrow    contained /=>/ skipwhite skipempty nextgroup=@jsFlowReturnCluster
+syntax match   jsFlowReturnKeyword  contained /\k\+/ contains=jsFlowType,jsFlowTypeCustom skipwhite skipempty nextgroup=jsFlowReturnGroup,jsFuncBlock,jsFlowReturnOrOp,jsFlowReturnArray
+syntax match   jsFlowReturnMaybe    contained /?/ skipwhite skipempty nextgroup=jsFlowReturnKeyword,jsFlowReturnObject,jsFlowReturnParens
 syntax region  jsFlowReturnGroup    contained matchgroup=jsFlowNoise start=/</ end=/>/ contains=@jsFlowCluster skipwhite skipempty nextgroup=jsFuncBlock,jsFlowReturnOrOp
 syntax match   jsFlowReturnOrOp     contained /\s*|\s*/ skipwhite skipempty nextgroup=@jsFlowReturnCluster
 syntax match   jsFlowWildcardReturn contained /*/ skipwhite skipempty nextgroup=jsFuncBlock
+syntax keyword jsFlowTypeofReturn   contained typeof skipempty skipwhite nextgroup=@jsFlowReturnCluster
 
-syntax region  jsFlowFunctionGroup  contained matchgroup=jsFlowNoise start=/</ end=/>/ contains=@jsFlowCluster skipwhite skipempty nextgroup=jsFuncArgs
-syntax region  jsFlowClassGroup     contained matchgroup=jsFlowNoise start=/</ end=/>/ contains=@jsFlowCluster skipwhite skipempty nextgroup=jsClassBlock
+syntax region  jsFlowFunctionGroup      contained matchgroup=jsFlowNoise start=/</ end=/>/ contains=@jsFlowCluster skipwhite skipempty nextgroup=jsFuncArgs
+syntax region  jsFlowClassGroup         contained matchgroup=jsFlowNoise start=/</ end=/>/ contains=@jsFlowCluster skipwhite skipempty nextgroup=jsClassBlock
+syntax region  jsFlowClassFunctionGroup contained matchgroup=jsFlowNoise start=/</ end=/>/ contains=@jsFlowCluster skipwhite skipempty nextgroup=jsFuncArgs
+syntax match   jsFlowObjectFuncName contained /\<\K\k*<\@=/ skipwhite skipempty nextgroup=jsFlowObjectGeneric containedin=jsObject
 
-syntax region  jsFlowTypeStatement                                   start=/type\%(\s\+\k\)\@=/    end=/=\@=/ contains=jsFlowTypeOperator oneline skipwhite skipempty nextgroup=jsFlowTypeValue keepend
-syntax region  jsFlowTypeValue      contained                        start=/=/       end=/[;\n]/ contains=@jsExpression,jsFlowGroup,jsFlowMaybe
+syntax region  jsFlowTypeStatement                                   start=/\(opaque\s\+\)\?type\%(\s\+\k\)\@=/    end=/=\@=/ contains=jsFlowTypeOperator oneline skipwhite skipempty nextgroup=jsFlowTypeValue keepend
+syntax region  jsFlowTypeValue      contained     matchgroup=jsFlowNoise start=/=/ end=/\%(;\|\n\%(\s*|\)\@!\)/ contains=@jsFlowCluster,jsFlowGeneric,jsFlowMaybe
+syntax match   jsFlowTypeOperator   contained /=/ containedin=jsFlowTypeValue
 syntax match   jsFlowTypeOperator   contained /=/
 syntax keyword jsFlowTypeKeyword    contained type
 
@@ -38,14 +44,17 @@ syntax keyword jsFlowDeclare                  declare skipwhite skipempty nextgr
 syntax match   jsFlowClassProperty  contained /\<[0-9a-zA-Z_$]*\>:\@=/ skipwhite skipempty nextgroup=jsFlowClassDef containedin=jsClassBlock
 syntax region  jsFlowClassDef       contained start=/:/    end=/\%(\s*[,=;)\n]\)\@=/ contains=@jsFlowCluster skipwhite skipempty nextgroup=jsClassValue
 
-syntax region  jsFlowModule         contained start=/module/ end=/{\@=/ skipempty skipempty nextgroup=jsFlowDeclareBlock contains=jsString
-syntax region  jsFlowInterface      contained start=/interface/ end=/{\@=/ skipempty skipempty nextgroup=jsFlowInterfaceBlock contains=@jsFlowCluster
-syntax region  jsFlowDeclareBlock   contained matchgroup=jsFlowNoise start=/{/ end=/}/ contains=jsFlowDeclare,jsFlowNoise
+syntax region  jsFlowModule         contained start=/module/ end=/\%({\|:\)\@=/ skipempty skipwhite nextgroup=jsFlowDeclareBlock contains=jsString
+syntax region  jsFlowInterface      contained start=/interface/ end=/{\@=/ skipempty skipwhite nextgroup=jsFlowInterfaceBlock contains=@jsFlowCluster
+syntax region  jsFlowDeclareBlock   contained matchgroup=jsFlowNoise start=/{/ end=/}/ contains=jsFlowDeclare,jsFlowNoise fold
 
-syntax region jsFlowInterfaceBlock  contained matchgroup=jsFlowNoise start=/{/ end=/}/ contains=jsObjectKey,jsObjectKeyString,jsObjectKeyComputed,jsObjectSeparator,jsObjectFuncName,jsObjectMethodType,jsGenerator,jsComment,jsObjectStringKey,jsSpreadExpression,jsFlowNoise keepend
+syntax match   jsFlowMaybe          contained /?/
+syntax region  jsFlowInterfaceBlock contained matchgroup=jsFlowNoise start=/{/ end=/}/ contains=jsObjectKey,jsObjectKeyString,jsObjectKeyComputed,jsObjectSeparator,jsObjectFuncName,jsFlowObjectFuncName,jsObjectMethodType,jsGenerator,jsComment,jsObjectStringKey,jsSpreadExpression,jsFlowNoise,jsFlowParens,jsFlowGeneric keepend fold
 
-syntax cluster jsFlowReturnCluster            contains=jsFlowNoise,jsFlowReturnObject,jsFlowReturnArray,jsFlowReturnKeyword,jsFlowReturnGroup,jsFlowReturnMaybe,jsFlowReturnOrOp,jsFlowWildcardReturn
-syntax cluster jsFlowCluster                  contains=jsFlowArray,jsFlowObject,jsFlowNoise,jsFlowTypeof,jsFlowType,jsFlowGroup,jsFlowArrowArguments,jsFlowMaybe,jsFlowParens,jsFlowOrOperator,jsFlowWildcard
+syntax region  jsFlowParenAnnotation contained start=/:/ end=/[,=)]\@=/ containedin=jsParen contains=@jsFlowCluster
+
+syntax cluster jsFlowReturnCluster            contains=jsFlowNoise,jsFlowReturnObject,jsFlowReturnArray,jsFlowReturnKeyword,jsFlowReturnGroup,jsFlowReturnMaybe,jsFlowReturnOrOp,jsFlowWildcardReturn,jsFlowReturnArrow,jsFlowTypeofReturn
+syntax cluster jsFlowCluster                  contains=jsFlowArray,jsFlowObject,jsFlowExactObject,jsFlowNoise,jsFlowTypeof,jsFlowType,jsFlowGeneric,jsFlowMaybe,jsFlowParens,jsFlowOrOperator,jsFlowWildcard
 
 if version >= 508 || !exists("did_javascript_syn_inits")
   if version < 508
@@ -60,22 +69,27 @@ if version >= 508 || !exists("did_javascript_syn_inits")
   HiLink jsFlowType               Type
   HiLink jsFlowTypeCustom         PreProc
   HiLink jsFlowTypeof             PreProc
+  HiLink jsFlowTypeofReturn       PreProc
   HiLink jsFlowArray              PreProc
   HiLink jsFlowObject             PreProc
+  HiLink jsFlowExactObject        PreProc
   HiLink jsFlowParens             PreProc
-  HiLink jsFlowGroup              PreProc
+  HiLink jsFlowGeneric            PreProc
+  HiLink jsFlowObjectGeneric      jsFlowGeneric
   HiLink jsFlowReturn             PreProc
+  HiLink jsFlowParenAnnotation    PreProc
   HiLink jsFlowReturnObject       jsFlowReturn
   HiLink jsFlowReturnArray        jsFlowArray
   HiLink jsFlowReturnParens       jsFlowParens
-  HiLink jsFlowReturnGroup        jsFlowGroup
+  HiLink jsFlowReturnGroup        jsFlowGeneric
   HiLink jsFlowFunctionGroup      PreProc
   HiLink jsFlowClassGroup         PreProc
-  HiLink jsFlowArrowArguments     PreProc
+  HiLink jsFlowClassFunctionGroup PreProc
   HiLink jsFlowArrow              PreProc
+  HiLink jsFlowReturnArrow        PreProc
   HiLink jsFlowTypeStatement      PreProc
   HiLink jsFlowTypeKeyword        PreProc
-  HiLink jsFlowTypeOperator       PreProc
+  HiLink jsFlowTypeOperator       Operator
   HiLink jsFlowMaybe              PreProc
   HiLink jsFlowReturnMaybe        PreProc
   HiLink jsFlowClassProperty      jsClassProperty
@@ -84,9 +98,12 @@ if version >= 508 || !exists("did_javascript_syn_inits")
   HiLink jsFlowInterface          PreProc
   HiLink jsFlowNoise              Noise
   HiLink jsFlowObjectKey          jsObjectKey
-  HiLink jsFlowOrOperator         PreProc
+  HiLink jsFlowOrOperator         jsOperator
   HiLink jsFlowReturnOrOp         jsFlowOrOperator
   HiLink jsFlowWildcard           PreProc
   HiLink jsFlowWildcardReturn     PreProc
+  HiLink jsFlowImportType         PreProc
+  HiLink jsFlowTypeValue          PreProc
+  HiLink jsFlowObjectFuncName     jsObjectFuncName
   delcommand HiLink
 endif
diff --git a/extras/jsdoc.vim b/extras/jsdoc.vim
index 6acb8640..a7189d1b 100644
--- a/extras/jsdoc.vim
+++ b/extras/jsdoc.vim
@@ -6,11 +6,11 @@ syntax match  jsDocTags         contained "@\(alias\|api\|augments\|borrows\|cla
 " tags containing type and param
 syntax match  jsDocTags         contained "@\(arg\|argument\|cfg\|param\|property\|prop\|typedef\)\>" skipwhite nextgroup=jsDocType
 " tags containing type but no param
-syntax match  jsDocTags         contained "@\(callback\|define\|enum\|external\|implements\|this\|type\|return\|returns\)\>" skipwhite nextgroup=jsDocTypeNoParam
+syntax match  jsDocTags         contained "@\(callback\|define\|enum\|external\|implements\|this\|type\|return\|returns\|yields\)\>" skipwhite nextgroup=jsDocTypeNoParam
 " tags containing references
 syntax match  jsDocTags         contained "@\(lends\|see\|tutorial\)\>" skipwhite nextgroup=jsDocSeeTag
 " other tags (no extra syntax)
-syntax match  jsDocTags         contained "@\(abstract\|access\|accessor\|author\|classdesc\|constant\|const\|constructor\|copyright\|deprecated\|desc\|description\|dict\|event\|example\|file\|file[oO]verview\|final\|function\|global\|ignore\|inheritDoc\|inner\|instance\|interface\|license\|localdoc\|method\|mixin\|nosideeffects\|override\|overview\|preserve\|private\|protected\|public\|readonly\|since\|static\|struct\|todo\|summary\|undocumented\|virtual\)\>"
+syntax match  jsDocTags         contained "@\(abstract\|access\|accessor\|async\|author\|classdesc\|constant\|const\|constructor\|copyright\|deprecated\|desc\|description\|dict\|event\|example\|file\|file[oO]verview\|final\|function\|global\|ignore\|inherit[dD]oc\|inner\|instance\|interface\|license\|localdoc\|method\|mixin\|nosideeffects\|override\|overview\|preserve\|private\|protected\|public\|readonly\|since\|static\|struct\|todo\|summary\|undocumented\|virtual\)\>"
 
 syntax region jsDocType         contained matchgroup=jsDocTypeBrackets start="{" end="}" contains=jsDocTypeRecord oneline skipwhite nextgroup=jsDocParam
 syntax match  jsDocType         contained "\%(#\|\"\|\w\|\.\|:\|\/\)\+" skipwhite nextgroup=jsDocParam
@@ -18,7 +18,8 @@ syntax region jsDocTypeRecord   contained start=/{/ end=/}/ contains=jsDocTypeRe
 syntax region jsDocTypeRecord   contained start=/\[/ end=/\]/ contains=jsDocTypeRecord extend
 syntax region jsDocTypeNoParam  contained start="{" end="}" oneline
 syntax match  jsDocTypeNoParam  contained "\%(#\|\"\|\w\|\.\|:\|\/\)\+"
-syntax match  jsDocParam        contained "\%(#\|\$\|-\|'\|\"\|{.\{-}}\|\w\|\.\|:\|\/\|\[.\{-}]\|=\)\+"
+syntax match  jsDocParam        contained "\%(#\|\$\|-\|'\|\"\|{.\{-}}\|\w\|\~\|\.\|:\|\/\|\[.\{-}]\|=\)\+"
+
 syntax region jsDocSeeTag       contained matchgroup=jsDocSeeTag start="{" end="}" contains=jsDocTags
 
 if version >= 508 || !exists("did_javascript_syn_inits")
diff --git a/ftdetect/flow.vim b/ftdetect/flow.vim
new file mode 100644
index 00000000..3f1ea65b
--- /dev/null
+++ b/ftdetect/flow.vim
@@ -0,0 +1 @@
+autocmd BufNewFile,BufRead *.flow setfiletype flow
diff --git a/ftdetect/javascript.vim b/ftdetect/javascript.vim
index d481d988..00487326 100644
--- a/ftdetect/javascript.vim
+++ b/ftdetect/javascript.vim
@@ -1,17 +1,8 @@
-au BufNewFile,BufRead *.{js,jsm,es,es6},Jakefile setf javascript
-
-fun! s:SourceFlowSyntax()
-  if !exists('javascript_plugin_flow') && !exists('b:flow_active') &&
-        \ search('\v\C%^\_s*%(//\s*|/\*[ \t\n*]*)\@flow>','nw')
-    runtime extras/flow.vim
-    let b:flow_active = 1
-  endif
-endfun
-au FileType javascript au BufRead,BufWritePost <buffer> call s:SourceFlowSyntax()
-
 fun! s:SelectJavascript()
   if getline(1) =~# '^#!.*/bin/\%(env\s\+\)\?node\>'
     set ft=javascript
   endif
 endfun
-au BufNewFile,BufRead * call s:SelectJavascript()
+
+autocmd BufNewFile,BufRead *.{js,mjs,cjs,jsm,es,es6},Jakefile setfiletype javascript
+autocmd BufNewFile,BufRead * call s:SelectJavascript()
diff --git a/indent/javascript.vim b/indent/javascript.vim
index 3705df1b..b754e282 100644
--- a/indent/javascript.vim
+++ b/indent/javascript.vim
@@ -2,7 +2,7 @@
 " Language: Javascript
 " Maintainer: Chris Paul ( https://github.com/bounceme )
 " URL: https://github.com/pangloss/vim-javascript
-" Last Change: May 30, 2017
+" Last Change: December 4, 2017
 
 " Only load this indent file when no other was loaded.
 if exists('b:did_indent')
@@ -10,10 +10,6 @@ if exists('b:did_indent')
 endif
 let b:did_indent = 1
 
-" indent correctly if inside <script>
-" vim/vim@690afe1 for the switch from cindent
-let b:html_indent_script1 = 'inc'
-
 " Now, set up our indentation expression and keys that trigger it.
 setlocal indentexpr=GetJavascriptIndent()
 setlocal autoindent nolisp nosmartindent
@@ -23,14 +19,7 @@ setlocal indentkeys+=0],0)
 "       "+norm! gg=G" '+%print' '+:q!' testfile.js \
 "       | diff -uBZ testfile.js -
 
-let b:undo_indent = 'setlocal indentexpr< smartindent< autoindent< indentkeys<'
-
-" Regex of syntax group names that are or delimit string or are comments.
-let b:syng_strcom = get(b:,'syng_strcom','string\|comment\|regex\|special\|doc\|template\%(braces\)\@!')
-let b:syng_str = get(b:,'syng_str','string\|template\|special')
-" template strings may want to be excluded when editing graphql:
-" au! Filetype javascript let b:syng_str = '^\%(.*template\)\@!.*string\|special'
-" au! Filetype javascript let b:syng_strcom = '^\%(.*template\)\@!.*string\|comment\|regex\|special\|doc'
+let b:undo_indent = 'setlocal indentexpr< smartindent< autoindent< indentkeys< lisp<'
 
 " Only define the function once.
 if exists('*GetJavascriptIndent')
@@ -40,6 +29,23 @@ endif
 let s:cpo_save = &cpo
 set cpo&vim
 
+" indent correctly if inside <script>
+" vim/vim@690afe1 for the switch from cindent
+" overridden with b:html_indent_script1
+call extend(g:,{'html_indent_script1': 'inc'},'keep')
+
+" Regex of syntax group names that are or delimit string or are comments.
+let s:bvars = {
+      \ 'syng_strcom': 'string\|comment\|regex\|special\|doc\|template\%(braces\)\@!',
+      \ 'syng_str': 'string\|template\|special' }
+" template strings may want to be excluded when editing graphql:
+" au! Filetype javascript let b:syng_str = '^\%(.*template\)\@!.*string\|special'
+" au! Filetype javascript let b:syng_strcom = '^\%(.*template\)\@!.*string\|comment\|regex\|special\|doc'
+
+function s:GetVars()
+  call extend(b:,extend(s:bvars,{'js_cache': [0,0,0]}),'keep')
+endfunction
+
 " Get shiftwidth value
 if exists('*shiftwidth')
   function s:sw()
@@ -55,343 +61,317 @@ endif
 " matches before pos.
 let s:z = has('patch-7.4.984') ? 'z' : ''
 
-let s:syng_com = 'comment\|doc'
 " Expression used to check whether we should skip a match with searchpair().
-let s:skip_expr = "s:syn_at(line('.'),col('.')) =~? b:syng_strcom"
+let s:skip_expr = "s:SynAt(line('.'),col('.')) =~? b:syng_strcom"
+let s:in_comm = s:skip_expr[:-14] . "'comment\\|doc'"
 
+let s:rel = has('reltime')
 " searchpair() wrapper
-if has('reltime')
-  function s:GetPair(start,end,flags,skip,time,...)
-    return searchpair('\m'.a:start,'','\m'.a:end,a:flags,a:skip,max([prevnonblank(v:lnum) - 2000,0] + a:000),a:time)
+if s:rel
+  function s:GetPair(start,end,flags,skip)
+    return searchpair('\m'.a:start,'','\m'.a:end,a:flags,a:skip,s:l1,a:skip ==# 's:SkipFunc()' ? 2000 : 200)
   endfunction
 else
-  function s:GetPair(start,end,flags,skip,...)
-    return searchpair('\m'.a:start,'','\m'.a:end,a:flags,a:skip,max([prevnonblank(v:lnum) - 1000,get(a:000,1)]))
+  function s:GetPair(start,end,flags,skip)
+    return searchpair('\m'.a:start,'','\m'.a:end,a:flags,a:skip,s:l1)
   endfunction
 endif
 
-function s:syn_at(l,c)
-  let pos = join([a:l,a:c],',')
-  if has_key(s:synId_cache,pos)
-    return s:synId_cache[pos]
+function s:SynAt(l,c)
+  let byte = line2byte(a:l) + a:c - 1
+  let pos = index(s:synid_cache[0], byte)
+  if pos == -1
+    let s:synid_cache[:] += [[byte], [synIDattr(synID(a:l, a:c, 0), 'name')]]
   endif
-  let s:synId_cache[pos] = synIDattr(synID(a:l,a:c,0),'name')
-  return s:synId_cache[pos]
+  return s:synid_cache[1][pos]
 endfunction
 
-function s:parse_cino(f)
-  let [cin, divider, n] = [strridx(&cino,a:f), 0, '']
-  if cin == -1
-    return
-  endif
-  let [sign, cstr] = &cino[cin+1] == '-' ? [-1, &cino[cin+2:]] : [1, &cino[cin+1:]]
-  for c in split(cstr,'\zs')
-    if c == '.' && !divider
+function s:ParseCino(f)
+  let [s, n, divider] = [strridx(&cino, a:f)+1, '', 0]
+  while s && &cino[ s ] =~ '[^,]'
+    if &cino[ s ] == '.'
       let divider = 1
-    elseif c ==# 's'
-      if n is ''
-        let n = s:sw()
-      else
-        let n = str2nr(n) * s:sw()
+    elseif &cino[ s ] ==# 's'
+      if n !~ '\d'
+        return n . s:sw() + 0
       endif
+      let n = str2nr(n) * s:sw()
       break
-    elseif c =~ '\d'
-      let [n, divider] .= [c, 0]
     else
-      break
+      let [n, divider] .= [&cino[ s ], 0]
     endif
-  endfor
-  return sign * str2nr(n) / max([str2nr(divider),1])
+    let s += 1
+  endwhile
+  return str2nr(n) / max([divider, 1])
 endfunction
 
-" Optimized {skip} expr, used only once per GetJavascriptIndent() call
-function s:skip_func()
-  if s:topCol == 1 || line('.') < s:scriptTag
-    return {} " E728, used as limit condition for loops and searchpair()
-  endif
-  let s:topCol = col('.')
-  if getline('.') =~ '\%<'.s:topCol.'c\/.\{-}\/\|\%>'.s:topCol.'c[''"]\|\\$'
+" Optimized {skip} expr, only callable from the search loop which
+" GetJavascriptIndent does to find the containing [[{(] (side-effects)
+function s:SkipFunc()
+  if s:top_col == 1
+    throw 'out of bounds'
+  elseif s:check_in
+    if eval(s:skip_expr)
+      return 1
+    endif
+    let s:check_in = 0
+  elseif getline('.') =~ '\%<'.col('.').'c\/.\{-}\/\|\%>'.col('.').'c[''"]\|\\$'
     if eval(s:skip_expr)
-      let s:topCol = 0
+      return 1
     endif
-    return !s:topCol
-  elseif s:checkIn || search('\m`\|\${\|\*\/','nW'.s:z,s:looksyn)
-    let s:checkIn = eval(s:skip_expr)
-    if s:checkIn
-      let s:topCol = 0
+  elseif search('\m`\|\${\|\*\/','nW'.s:z,s:looksyn)
+    if eval(s:skip_expr)
+      let s:check_in = 1
+      return 1
     endif
+  else
+    let s:synid_cache[:] += [[line2byte('.') + col('.') - 1], ['']]
   endif
-  let s:looksyn = line('.')
-  return s:checkIn
+  let [s:looksyn, s:top_col] = getpos('.')[1:2]
 endfunction
 
-function s:alternatePair()
-  let [l:pos, pat, l:for] = [getpos('.'), '[][(){};]', 2]
-  while search('\m'.pat,'bW')
-    let tok = s:skip_func() ? '' : s:looking_at()
-    if tok is ''
-      continue
-    elseif tok == ';'
+function s:AlternatePair()
+  let [pat, l:for] = ['[][(){};]', 2]
+  while s:SearchLoop(pat,'bW','s:SkipFunc()')
+    if s:LookingAt() == ';'
       if !l:for
-        if s:GetPair('{','}','bW','s:skip_func()',2000) > 0
+        if s:GetPair('{','}','bW','s:SkipFunc()')
           return
         endif
+        break
       else
         let [pat, l:for] = ['[{}();]', l:for - 1]
-        continue
-      endif
-    elseif tok =~ '[])}]'
-      if s:GetPair(escape(tr(tok,'])}','[({'),'['), tok,'bW','s:skip_func()',2000) > 0
-        continue
       endif
     else
-      return
+      let idx = stridx('])}',s:LookingAt())
+      if idx == -1
+        return
+      elseif !s:GetPair(['\[','(','{'][idx],'])}'[idx],'bW','s:SkipFunc()')
+        break
+      endif
     endif
-    break
   endwhile
-  call setpos('.',l:pos)
+  throw 'out of bounds'
 endfunction
 
 function s:Nat(int)
-  return max([a:int,0])
+  return a:int * (a:int > 0)
 endfunction
 
-function s:looking_at()
+function s:LookingAt()
   return getline('.')[col('.')-1]
 endfunction
 
-function s:token()
-  return s:looking_at() =~ '\k' ? expand('<cword>') : s:looking_at()
+function s:Token()
+  return s:LookingAt() =~ '\k' ? expand('<cword>') : s:LookingAt()
 endfunction
 
-function s:previous_token()
-  let l:pos = getpos('.')
+function s:PreviousToken(...)
+  let [l:pos, tok] = [getpos('.'), '']
   if search('\m\k\{1,}\|\S','ebW')
-    if (strpart(getline('.'),col('.')-2,2) == '*/' || line('.') != l:pos[1] &&
-          \ getline('.')[:col('.')-1] =~ '\/\/') && s:syn_at(line('.'),col('.')) =~? s:syng_com
-      while search('\m\S\ze\_s*\/[/*]','bW')
-        if s:syn_at(line('.'),col('.')) !~? s:syng_com
-          return s:token()
-        endif
-      endwhile
+    if getline('.')[col('.')-2:col('.')-1] == '*/'
+      if eval(s:in_comm) && !s:SearchLoop('\S\ze\_s*\/[/*]','bW',s:in_comm)
+        call setpos('.',l:pos)
+      else
+        let tok = s:Token()
+      endif
     else
-      return s:token()
+      let two = a:0 || line('.') != l:pos[1] ? strridx(getline('.')[:col('.')],'//') + 1 : 0
+      if two && eval(s:in_comm)
+        call cursor(0,two)
+        let tok = s:PreviousToken(1)
+        if tok is ''
+          call setpos('.',l:pos)
+        endif
+      else
+        let tok = s:Token()
+      endif
     endif
-    call setpos('.',l:pos)
   endif
-  return ''
+  return tok
+endfunction
+
+function s:Pure(f,...)
+  return eval("[call(a:f,a:000),cursor(a:firstline,".col('.').")][0]")
 endfunction
 
-function s:__previous_token()
-  let l:pos = getpos('.')
-  let ret = s:previous_token()
-  call setpos('.',l:pos)
-  return ret
+function s:SearchLoop(pat,flags,expr)
+  return s:GetPair(a:pat,'\_$.',a:flags,a:expr)
 endfunction
 
-function s:expr_col()
-  let [bal, l:pos] = [0, getpos('.')]
-  while bal < 1 && search('\m[{}?:;]','bW',s:scriptTag)
-    let tok = eval(s:skip_expr) ? '' : s:looking_at()
-    if tok is ''
-      continue
-    elseif tok == ':'
-      if getpos('.')[1:2] == [l:pos[1],l:pos[2]-1]
-        let bal = 1
+function s:ExprCol()
+  if getline('.')[col('.')-2] == ':'
+    return 1
+  endif
+  let bal = 0
+  while s:SearchLoop('[{}?:]','bW',s:skip_expr)
+    if s:LookingAt() == ':'
+      let bal -= !search('\m:\%#','bW')
+    elseif s:LookingAt() == '?'
+      if getline('.')[col('.'):col('.')+1] =~ '^\.\d\@!'
+        " ?. conditional chain, not ternary start
+      elseif !bal
+        return 1
       else
-        let bal -= strpart(getline('.'),col('.')-2,3) !~ '::'
+        let bal += 1
       endif
-    elseif tok == '?'
-      let bal += 1
-    elseif tok == '{' && !s:IsBlock()
-      let bal = 1
-    elseif tok != '}' || s:GetPair('{','}','bW',s:skip_expr,200) < 1
+    elseif s:LookingAt() == '{'
+      return !s:IsBlock()
+    elseif !s:GetPair('{','}','bW',s:skip_expr)
       break
     endif
   endwhile
-  call setpos('.',l:pos)
-  return s:Nat(bal)
 endfunction
 
 " configurable regexes that define continuation lines, not including (, {, or [.
 let s:opfirst = '^' . get(g:,'javascript_opfirst',
-      \ '\C\%([<>=,?^%|*/&]\|\([-.:+]\)\1\@!\|!=\|in\%(stanceof\)\=\>\)')
+      \ '\C\%([<>=,.?^%|/&]\|\([-:+]\)\1\@!\|\*\+\|!=\|in\%(stanceof\)\=\>\)')
 let s:continuation = get(g:,'javascript_continuation',
       \ '\C\%([<=,.~!?/*^%|&:]\|+\@<!+\|-\@<!-\|=\@<!>\|\<\%(typeof\|new\|delete\|void\|in\|instanceof\|await\)\)') . '$'
 
-function s:continues(ln,con)
-  let tok = matchstr(a:con[-15:],s:continuation)
-  if tok isnot ''
-    call cursor(a:ln,strlen(a:con))
-    if tok =~ '[/>]'
-      return s:syn_at(a:ln,col('.')) !~? (tok == '>' ? 'jsflow\|^html' : 'regex')
-    elseif tok =~ '\l'
-      return s:previous_token() != '.'
-    elseif tok == ':'
-      return s:expr_col()
-    endif
-    return 1
+function s:Continues()
+  let tok = matchstr(strpart(getline('.'),col('.')-15,15),s:continuation)
+  if tok =~ '[a-z:]'
+    return tok == ':' ? s:ExprCol() : s:PreviousToken() != '.'
+  elseif tok !~ '[/>]'
+    return tok isnot ''
   endif
-endfunction
-
-function s:Trim(ln)
-  let pline = substitute(getline(a:ln),'\s*$','','')
-  let l:max = max([strridx(pline,'//'), strridx(pline,'/*')])
-  while l:max != -1 && s:syn_at(a:ln, strlen(pline)) =~? s:syng_com
-    let pline = pline[: l:max]
-    let l:max = max([strridx(pline,'//'), strridx(pline,'/*')])
-    let pline = substitute(pline[:-2],'\s*$','','')
-  endwhile
-  return pline
-endfunction
-
-" Find line above 'lnum' that isn't empty or in a comment
-function s:PrevCodeLine(lnum)
-  let l:n = prevnonblank(a:lnum)
-  while l:n
-    if getline(l:n) =~ '^\s*\/[/*]'
-      if (stridx(getline(l:n),'`') != -1 || getline(l:n-1)[-1:] == '\') &&
-            \ s:syn_at(l:n,1) =~? b:syng_str
-        break
-      endif
-      let l:n = prevnonblank(l:n-1)
-    elseif stridx(getline(l:n), '*/') != -1 && s:syn_at(l:n,1) =~? s:syng_com
-      for l:n in range(l:n-1, s:Nat(l:n-(&cino =~ '\*' ? s:parse_cino('*') : 70)-1), -1)
-        if stridx(getline(l:n),'/*') != -1
-          break
-        endif
-      endfor
-    else
-      break
-    endif
-  endwhile
-  return l:n
+  return s:SynAt(line('.'),col('.')) !~? (tok == '>' ? 'jsflow\|^html' : 'regex')
 endfunction
 
 " Check if line 'lnum' has a balanced amount of parentheses.
-function s:Balanced(lnum)
+function s:Balanced(lnum,line)
   let l:open = 0
-  let l:line = getline(a:lnum)
-  let pos = match(l:line, '[][(){}]', 0)
+  let pos = match(a:line, '[][(){}]')
   while pos != -1
-    if s:syn_at(a:lnum,pos + 1) !~? b:syng_strcom
-      let l:open += match(' ' . l:line[pos],'[[({]')
+    if s:SynAt(a:lnum,pos + 1) !~? b:syng_strcom
+      let l:open += matchend(a:line[pos],'[[({]')
       if l:open < 0
         return
       endif
     endif
-    let pos = match(l:line, (l:open ?
-          \ '['.matchstr(['][','()','{}'],l:line[pos]).']' :
-          \ '[][(){}]'), pos + 1)
+    let pos = match(a:line, !l:open ? '[][(){}]' : '()' =~ a:line[pos] ?
+          \ '[()]' : '{}' =~ a:line[pos] ? '[{}]' : '[][]', pos + 1)
   endwhile
   return !l:open
 endfunction
 
-function s:OneScope(lnum)
-  let pline = s:Trim(a:lnum)
-  call cursor(a:lnum,strlen(pline))
-  let kw = 'else do'
-  if pline[-1:] == ')' && s:GetPair('(', ')', 'bW', s:skip_expr, 100) > 0
-    if s:previous_token() =~# '^\%(await\|each\)$'
-      call s:previous_token()
-      let kw = 'for'
-    else
-      let kw = 'for if let while with'
-    endif
+function s:OneScope()
+  if s:LookingAt() == ')' && s:GetPair('(', ')', 'bW', s:skip_expr)
+    let tok = s:PreviousToken()
+    return (count(split('for if let while with'),tok) ||
+          \ tok =~# '^await$\|^each$' && s:PreviousToken() ==# 'for') &&
+          \ s:Pure('s:PreviousToken') != '.' && !(tok == 'while' && s:DoWhile())
+  elseif s:Token() =~# '^else$\|^do$'
+    return s:Pure('s:PreviousToken') != '.'
+  elseif strpart(getline('.'),col('.')-2,2) == '=>'
+    call cursor(0,col('.')-1)
+    return s:PreviousToken() != ')' || s:GetPair('(', ')', 'bW', s:skip_expr)
   endif
-  return pline[-2:] == '=>' || index(split(kw),s:token()) != -1 &&
-        \ s:__previous_token() != '.' && !s:doWhile()
 endfunction
 
-function s:doWhile()
-  if expand('<cword>') ==# 'while'
-    let l:pos = searchpos('\m\<','cbW')
-    while search('\m\C[{}]\|\<\%(do\|while\)\>','bW')
-      if !eval(s:skip_expr)
-        if (s:looking_at() == '}' && s:GetPair('{','}','bW',s:skip_expr,200) > 0 ?
-              \ s:previous_token() : s:token()) ==# 'do' && s:IsBlock()
+function s:DoWhile()
+  let cpos = searchpos('\m\<','cbW')
+  while s:SearchLoop('\C[{}]\|\<\%(do\|while\)\>','bW',s:skip_expr)
+    if s:LookingAt() =~ '\a'
+      if s:Pure('s:IsBlock')
+        if s:LookingAt() ==# 'd'
           return 1
         endif
         break
       endif
-    endwhile
-    call setpos('.',l:pos)
-  endif
+    elseif s:LookingAt() != '}' || !s:GetPair('{','}','bW',s:skip_expr)
+      break
+    endif
+  endwhile
+  call call('cursor',cpos)
 endfunction
 
-" returns braceless levels started by 'i' and above lines * &sw. 'num' is the
-" lineNr which encloses the entire context, 'cont' if whether line 'i' + 1 is
-" a continued expression, which could have started in a braceless context
-function s:iscontOne(i,num,cont)
-  let [l:i, l:num, bL] = [a:i, a:num + !a:num, 0]
-  let pind = a:num ? indent(l:num) + s:sw() : 0
-  let ind = indent(l:i) + (a:cont ? 0 : s:sw())
-  while l:i >= l:num && (ind > pind || l:i == l:num)
-    if indent(l:i) < ind && s:OneScope(l:i)
-      let bL += s:sw()
-      let l:i = line('.')
-    elseif !a:cont || bL || ind < indent(a:i)
+" returns total offset from braceless contexts. 'num' is the lineNr which
+" encloses the entire context, 'cont' if whether a:firstline is a continued
+" expression, which could have started in a braceless context
+function s:IsContOne(cont)
+  let [l:num, pind] = b:js_cache[1] ?
+        \ [b:js_cache[1], indent(b:js_cache[1]) + s:sw()] : [1,0]
+  let [ind, b_l] = [indent('.') + !a:cont, 0]
+  while line('.') > l:num && ind > pind || line('.') == l:num
+    if indent('.') < ind && s:OneScope()
+      let b_l += 1
+    elseif !a:cont || b_l || ind < indent(a:firstline)
+      break
+    else
+      call cursor(0,1)
+    endif
+    let ind = min([ind, indent('.')])
+    if s:PreviousToken() is ''
       break
     endif
-    let ind = min([ind, indent(l:i)])
-    let l:i = s:PrevCodeLine(l:i - 1)
   endwhile
-  return bL
+  return b_l
+endfunction
+
+function s:IsSwitch()
+  return search(printf('\m\C\%%%dl\%%%dc%s',b:js_cache[1],b:js_cache[2],
+        \ '{\_s*\%(\%(\/\/.*\_$\|\/\*\_.\{-}\*\/\)\@>\_s*\)*\%(case\|default\)\>'),'nW'.s:z)
 endfunction
 
 " https://github.com/sweet-js/sweet.js/wiki/design#give-lookbehind-to-the-reader
 function s:IsBlock()
-  let l:n = line('.')
-  let tok = s:previous_token()
-  if match(s:stack,'\cxml\|jsx') != -1 && s:syn_at(line('.'),col('.')-1) =~? 'xml\|jsx'
+  let tok = s:PreviousToken()
+  if join(s:stack) =~? 'xml\|jsx' && s:SynAt(line('.'),col('.')-1) =~? 'xml\|jsx'
+    let s:in_jsx = 1
     return tok != '{'
   elseif tok =~ '\k'
     if tok ==# 'type'
-      return s:__previous_token() !~# '^\%(im\|ex\)port$'
+      return s:Pure('eval',"s:PreviousToken() !~# '^\\%(im\\|ex\\)port$' || s:PreviousToken() == '.'")
+    elseif tok ==# 'of'
+      return s:Pure('eval',"!s:GetPair('[[({]','[])}]','bW',s:skip_expr) || s:LookingAt() != '(' ||"
+            \ ."s:{s:PreviousToken() ==# 'await' ? 'Previous' : ''}Token() !=# 'for' || s:PreviousToken() == '.'")
     endif
-    return index(split('return const let import export extends yield default delete var await void typeof throw case new of in instanceof')
-          \ ,tok) < (line('.') != l:n) || s:__previous_token() == '.'
+    return index(split('return const let import export extends yield default delete var await void typeof throw case new in instanceof')
+          \ ,tok) < (line('.') != a:firstline) || s:Pure('s:PreviousToken') == '.'
   elseif tok == '>'
-    return getline('.')[col('.')-2] == '=' || s:syn_at(line('.'),col('.')) =~? 'jsflow\|^html'
+    return getline('.')[col('.')-2] == '=' || s:SynAt(line('.'),col('.')) =~? 'jsflow\|^html'
   elseif tok == '*'
-    return s:__previous_token() == ':'
+    return s:Pure('s:PreviousToken') == ':'
   elseif tok == ':'
-    return !s:expr_col()
+    return s:Pure('eval',"s:PreviousToken() =~ '^\\K\\k*$' && !s:ExprCol()")
   elseif tok == '/'
-    return s:syn_at(line('.'),col('.')) =~? 'regex'
+    return s:SynAt(line('.'),col('.')) =~? 'regex'
+  elseif tok !~ '[=~!<,.?^%|&([]'
+    return tok !~ '[-+]' || line('.') != a:firstline && getline('.')[col('.')-2] == tok
   endif
-  return tok !~ '[=~!<,.?^%|&([]' &&
-        \ (tok !~ '[-+]' || l:n != line('.') && getline('.')[col('.')-2] == tok)
 endfunction
 
 function GetJavascriptIndent()
-  let b:js_cache = get(b:,'js_cache',[0,0,0])
-  let s:synId_cache = {}
-  " Get the current line.
+  call s:GetVars()
+  let s:synid_cache = [[],[]]
   let l:line = getline(v:lnum)
   " use synstack as it validates syn state and works in an empty line
-  let s:stack = map(synstack(v:lnum,1),"synIDattr(v:val,'name')")
-  let syns = get(s:stack,-1,'')
+  let s:stack = [''] + map(synstack(v:lnum,1),"synIDattr(v:val,'name')")
 
   " start with strings,comments,etc.
-  if syns =~? s:syng_com
-    if l:line =~ '^\s*\*'
-      return cindent(v:lnum)
-    elseif l:line !~ '^\s*\/[/*]'
-      return -1
+  if s:stack[-1] =~? 'comment\|doc'
+    if l:line !~ '^\s*\/[/*]'
+      return l:line =~ '^\s*\*' ? cindent(v:lnum) : -1
     endif
-  elseif syns =~? b:syng_str
-    if b:js_cache[0] == v:lnum - 1 && s:Balanced(v:lnum-1)
+  elseif s:stack[-1] =~? b:syng_str
+    if b:js_cache[0] == v:lnum - 1 && s:Balanced(v:lnum-1,getline(v:lnum-1))
       let b:js_cache[0] = v:lnum
     endif
     return -1
   endif
-  let l:lnum = s:PrevCodeLine(v:lnum - 1)
-  if !l:lnum
+
+  let nest = get(get(b:,'hi_indent',{}),'blocklnr')
+  let s:l1 = max([0, prevnonblank(v:lnum) - (s:rel ? 2000 : 1000), nest])
+  call cursor(v:lnum,1)
+  if s:PreviousToken() is ''
     return
   endif
+  let [l:lnum, lcol, pline] = getpos('.')[1:2] + [getline('.')[:col('.')-1]]
 
   let l:line = substitute(l:line,'^\s*','','')
+  let l:line_s = l:line[0]
   if l:line[:1] == '/*'
     let l:line = substitute(l:line,'^\%(\/\*.\{-}\*\/\s*\)*','','')
   endif
@@ -400,61 +380,97 @@ function GetJavascriptIndent()
   endif
 
   " the containing paren, bracket, or curly. Many hacks for performance
-  let [ s:scriptTag, idx ] = [ get(get(b:,'hi_indent',{}),'blocklnr'),
-        \ index([']',')','}'],l:line[0]) ]
-  if b:js_cache[0] >= l:lnum && b:js_cache[0] < v:lnum &&
-        \ (b:js_cache[0] > l:lnum || s:Balanced(l:lnum))
-    call call('cursor',b:js_cache[2] ? b:js_cache[1:] : [v:lnum,1])
+  call cursor(v:lnum,1)
+  let idx = index([']',')','}'],l:line[0])
+  if b:js_cache[0] > l:lnum && b:js_cache[0] < v:lnum ||
+        \ b:js_cache[0] == l:lnum && s:Balanced(l:lnum,pline)
+    call call('cursor',b:js_cache[1:])
   else
-    call cursor(v:lnum,1)
-    let [s:looksyn, s:checkIn, s:topCol] = [v:lnum - 1, 0, 0]
-    if idx != -1
-      call s:GetPair(['\[','(','{'][idx],'])}'[idx],'bW','s:skip_func()',2000)
-    elseif getline(v:lnum) !~ '^\S' && syns =~? 'block'
-      call s:GetPair('{','}','bW','s:skip_func()',2000)
-    else
-      call s:alternatePair()
-    endif
+    let [s:looksyn, s:top_col, s:check_in, s:l1] = [v:lnum - 1,0,0,
+          \ max([s:l1, &smc ? search('\m^.\{'.&smc.',}','nbW',s:l1 + 1) + 1 : 0])]
+    try
+      if idx != -1
+        call s:GetPair(['\[','(','{'][idx],'])}'[idx],'bW','s:SkipFunc()')
+      elseif getline(v:lnum) !~ '^\S' && s:stack[-1] =~? 'block\|^jsobject$'
+        if !s:GetPair('{','}','bW','s:SkipFunc()') && s:stack[-1] ==# 'jsObject'
+          return indent(l:lnum)
+        endif
+      else
+        call s:AlternatePair()
+      endif
+    catch /^\Cout of bounds$/
+      call cursor(v:lnum,1)
+    endtry
+    let b:js_cache[1:] = line('.') == v:lnum ? [0,0] : getpos('.')[1:2]
   endif
 
-  let b:js_cache = [v:lnum] + (line('.') == v:lnum ? [s:scriptTag,0] : getpos('.')[1:2])
-  let num = b:js_cache[1]
+  let [b:js_cache[0], num] = [v:lnum, b:js_cache[1]]
 
-  let [numInd, isOp, bL, l:switch_offset] = [s:Nat(indent(num)),0,0,0]
-  if !b:js_cache[2] || s:looking_at() == '{' && s:IsBlock()
-    let [ilnum, pline] = [line('.'), s:Trim(l:lnum)]
-    if b:js_cache[2] && s:looking_at() == ')' && s:GetPair('(',')','bW',s:skip_expr,100) > 0
+  let [num_ind, is_op, b_l, l:switch_offset, s:in_jsx] = [s:Nat(indent(num)),0,0,0,0]
+  if !num || s:LookingAt() == '{' && s:IsBlock()
+    let ilnum = line('.')
+    if num && !s:in_jsx && s:LookingAt() == ')' && s:GetPair('(',')','bW',s:skip_expr)
       if ilnum == num
-        let [num, numInd] = [line('.'), indent('.')]
+        let [num, num_ind] = [line('.'), indent('.')]
       endif
-      if idx == -1 && s:previous_token() ==# 'switch' && s:previous_token() != '.'
-        let l:switch_offset = &cino !~ ':' ? s:sw() : s:parse_cino(':')
+      if idx == -1 && s:PreviousToken() ==# 'switch' && s:IsSwitch()
+        let l:switch_offset = &cino !~ ':' ? s:sw() : s:ParseCino(':')
         if pline[-1:] != '.' && l:line =~# '^\%(default\|case\)\>'
-          return s:Nat(numInd + l:switch_offset)
+          return s:Nat(num_ind + l:switch_offset)
         elseif &cino =~ '='
-          let l:case_offset = s:parse_cino('=')
+          let l:case_offset = s:ParseCino('=')
+        endif
+      endif
+    endif
+    if idx == -1 && pline[-1:] !~ '[{;]'
+      call cursor(l:lnum, lcol)
+      let sol = matchstr(l:line,s:opfirst)
+      if sol is '' || sol == '/' && s:SynAt(v:lnum,
+            \ 1 + len(getline(v:lnum)) - len(l:line)) =~? 'regex'
+        if s:Continues()
+          let is_op = s:sw()
         endif
+      elseif num && sol =~# '^\%(in\%(stanceof\)\=\|\*\)$' &&
+            \ s:LookingAt() == '}' && s:GetPair('{','}','bW',s:skip_expr) &&
+            \ s:PreviousToken() == ')' && s:GetPair('(',')','bW',s:skip_expr) &&
+            \ (s:PreviousToken() == ']' || s:LookingAt() =~ '\k' &&
+            \ s:{s:PreviousToken() == '*' ? 'Previous' : ''}Token() !=# 'function')
+        return num_ind + s:sw()
+      else
+        let is_op = s:sw()
       endif
+      call cursor(l:lnum, lcol)
+      let b_l = s:Nat(s:IsContOne(is_op) - (!is_op && l:line =~ '^{')) * s:sw()
     endif
-    if idx == -1 && pline[-1:] !~ '[{;]' && syns !~? 'classblock'
-      let isOp = (l:line =~# s:opfirst || s:continues(l:lnum,pline)) * s:sw()
-      let bL = s:iscontOne(l:lnum,b:js_cache[1],isOp)
-      let bL -= (bL && l:line[0] == '{') * s:sw()
+  elseif idx == -1 && s:LookingAt() == '(' && &cino =~ '(' &&
+        \ (search('\m\S','nbW',num) || s:ParseCino('U'))
+    let pval = s:ParseCino('(')
+    if !pval
+      let [Wval, vcol] = [s:ParseCino('W'), virtcol('.')]
+      if search('\m'.get(g:,'javascript_indent_W_pat','\S'),'W',num)
+        return s:ParseCino('w') ? vcol : virtcol('.')-1
+      endif
+      return Wval ? s:Nat(num_ind + Wval) : vcol
     endif
-  elseif idx == -1 && getline(b:js_cache[1])[b:js_cache[2]-1] == '(' && &cino =~ '('
-    let pval = s:parse_cino('(')
-    return !pval || !search('\m\S','nbW',num) && !s:parse_cino('U') ?
-          \ (s:parse_cino('w') ? 0 : -!!search('\m\S','W'.s:z,num)) + virtcol('.') :
-          \ s:Nat(numInd + pval + s:GetPair('(',')','nbrmW',s:skip_expr,100,num) * s:sw())
+    return s:Nat(num_ind + pval + searchpair('\m(','','\m)','nbrmW',s:skip_expr,num) * s:sw())
   endif
 
   " main return
   if l:line =~ '^[])}]\|^|}'
-    return numInd
+    if l:line_s == ')'
+      if s:ParseCino('M')
+        return indent(l:lnum)
+      elseif num && &cino =~# 'm' && !s:ParseCino('m')
+        return virtcol('.') - 1
+      endif
+    endif
+    return num_ind
   elseif num
-    return s:Nat(numInd + get(l:,'case_offset',s:sw()) + l:switch_offset + bL + isOp)
+    return s:Nat(num_ind + get(l:,'case_offset',s:sw()) + l:switch_offset + b_l + is_op)
+  elseif nest
+    return indent(nextnonblank(nest+1)) + b_l + is_op
   endif
-  return bL + isOp
+  return b_l + is_op
 endfunction
 
 let &cpo = s:cpo_save
diff --git a/syntax/flow.vim b/syntax/flow.vim
new file mode 100644
index 00000000..3f972183
--- /dev/null
+++ b/syntax/flow.vim
@@ -0,0 +1,2 @@
+runtime syntax/javascript.vim
+runtime extras/flow.vim
diff --git a/syntax/javascript.vim b/syntax/javascript.vim
index 959e5780..02b0c78c 100644
--- a/syntax/javascript.vim
+++ b/syntax/javascript.vim
@@ -13,7 +13,7 @@ if !exists("main_syntax")
 endif
 
 " Dollar sign is permitted anywhere in an identifier
-if v:version > 704 || v:version == 704 && has('patch1142')
+if (v:version > 704 || v:version == 704 && has('patch1142')) && main_syntax == 'javascript'
   syntax iskeyword @,48-57,_,192-255,$
 else
   setlocal iskeyword+=$
@@ -24,74 +24,69 @@ syntax sync fromstart
 " syntax case ignore
 syntax case match
 
-syntax match   jsNoise          /[:,\;]\{1}/
-syntax match   jsNoise          /[\.]\{1}/ skipwhite skipempty nextgroup=jsObjectProp,jsFuncCall,jsPrototype,jsTaggedTemplate
-syntax match   jsObjectProp     contained /\<[a-zA-Z_$][0-9a-zA-Z_$]*\>/
-syntax match   jsFuncCall       /\k\+\%(\s*(\)\@=/
+syntax match   jsNoise          /[:;]/
+syntax match   jsNoise          /,/ skipwhite skipempty nextgroup=@jsExpression
+syntax match   jsDot            /\./ skipwhite skipempty nextgroup=jsObjectProp,jsFuncCall,jsPrototype,jsTaggedTemplate
+syntax match   jsObjectProp     contained /\<\K\k*/
+syntax match   jsFuncCall       /\<\K\k*\ze[\s\n]*(/
 syntax match   jsParensError    /[)}\]]/
 
 " Program Keywords
 syntax keyword jsStorageClass   const var let skipwhite skipempty nextgroup=jsDestructuringBlock,jsDestructuringArray,jsVariableDef
-syntax match   jsVariableDef    contained /\k\+/ skipwhite skipempty nextgroup=jsFlowDefinition
-syntax keyword jsOperator       delete instanceof typeof void new in of skipwhite skipempty nextgroup=@jsExpression
-syntax match   jsOperator       /[\!\|\&\+\-\<\>\=\%\/\*\~\^]\{1}/ skipwhite skipempty nextgroup=@jsExpression
+syntax match   jsVariableDef    contained /\<\K\k*/ skipwhite skipempty nextgroup=jsFlowDefinition
+syntax keyword jsOperatorKeyword delete instanceof typeof void new in skipwhite skipempty nextgroup=@jsExpression
+syntax keyword jsOf             of skipwhite skipempty nextgroup=@jsExpression
+syntax match   jsOperator       "[-!|&+<>=%/*~^]" skipwhite skipempty nextgroup=@jsExpression
 syntax match   jsOperator       /::/ skipwhite skipempty nextgroup=@jsExpression
 syntax keyword jsBooleanTrue    true
 syntax keyword jsBooleanFalse   false
 
 " Modules
 syntax keyword jsImport                       import skipwhite skipempty nextgroup=jsModuleAsterisk,jsModuleKeyword,jsModuleGroup,jsFlowImportType
-syntax keyword jsExport                       export skipwhite skipempty nextgroup=@jsAll,jsModuleGroup,jsExportDefault,jsModuleAsterisk,jsModuleKeyword
-syntax match   jsModuleKeyword      contained /\k\+/ skipwhite skipempty nextgroup=jsModuleAs,jsFrom,jsModuleComma
+syntax keyword jsExport                       export skipwhite skipempty nextgroup=@jsAll,jsModuleGroup,jsExportDefault,jsModuleAsterisk,jsModuleKeyword,jsFlowTypeStatement
+syntax match   jsModuleKeyword      contained /\<\K\k*/ skipwhite skipempty nextgroup=jsModuleAs,jsFrom,jsModuleComma
 syntax keyword jsExportDefault      contained default skipwhite skipempty nextgroup=@jsExpression
 syntax keyword jsExportDefaultGroup contained default skipwhite skipempty nextgroup=jsModuleAs,jsFrom,jsModuleComma
 syntax match   jsModuleAsterisk     contained /\*/ skipwhite skipempty nextgroup=jsModuleKeyword,jsModuleAs,jsFrom
 syntax keyword jsModuleAs           contained as skipwhite skipempty nextgroup=jsModuleKeyword,jsExportDefaultGroup
 syntax keyword jsFrom               contained from skipwhite skipempty nextgroup=jsString
-syntax match   jsModuleComma        contained /,/ skipwhite skipempty nextgroup=jsModuleKeyword,jsModuleAsterisk,jsModuleGroup
+syntax match   jsModuleComma        contained /,/ skipwhite skipempty nextgroup=jsModuleKeyword,jsModuleAsterisk,jsModuleGroup,jsFlowTypeKeyword
 
 " Strings, Templates, Numbers
-syntax region  jsString           start=+"+  skip=+\\\("\|$\)+  end=+"\|$+  contains=jsSpecial,@Spell extend
-syntax region  jsString           start=+'+  skip=+\\\('\|$\)+  end=+'\|$+  contains=jsSpecial,@Spell extend
-syntax region  jsTemplateString   start=+`+  skip=+\\\(`\|$\)+  end=+`+     contains=jsTemplateExpression,jsSpecial,@Spell extend
-syntax match   jsTaggedTemplate   /\k\+\%(`\)\@=/ nextgroup=jsTemplateString
-syntax match   jsNumber           /\<\d\+\%([eE][+-]\=\d\+\)\=\>\|\<0[bB][01]\+\>\|\<0[oO]\o\+\>\|\<0[xX]\x\+\>/
+syntax region  jsString           start=+\z(["']\)+  skip=+\\\%(\z1\|$\)+  end=+\z1+ end=+$+  contains=jsSpecial extend
+syntax region  jsTemplateString   start=+`+  skip=+\\`+  end=+`+     contains=jsTemplateExpression,jsSpecial extend
+syntax match   jsTaggedTemplate   /\<\K\k*\ze`/ nextgroup=jsTemplateString
+syntax match   jsNumber           /\c\<\%(\d\+\%(e[+-]\=\d\+\)\=\|0b[01]\+\|0o\o\+\|0x\%(\x\|_\)\+\)n\=\>/
 syntax keyword jsNumber           Infinity
-syntax match   jsFloat            /\<\%(\d\+\.\d\+\|\d\+\.\|\.\d\+\)\%([eE][+-]\=\d\+\)\=\>/
+syntax match   jsFloat            /\c\<\%(\d\+\.\d\+\|\d\+\.\|\.\d\+\)\%(e[+-]\=\d\+\)\=\>/
 
 " Regular Expressions
-syntax match   jsSpecial            contained "\v\\%(0|\\x\x\{2\}\|\\u\x\{4\}\|\c[A-Z]|.)"
+syntax match   jsSpecial            contained "\v\\%(x\x\x|u%(\x{4}|\{\x{4,5}})|c\u|.)"
 syntax region  jsTemplateExpression contained matchgroup=jsTemplateBraces start=+${+ end=+}+ contains=@jsExpression keepend
-syntax region  jsRegexpCharClass    contained start=+\[+ skip=+\\.+ end=+\]+
-syntax match   jsRegexpBoundary     contained "\v%(\<@![\^$]|\\[bB])"
-syntax match   jsRegexpBackRef      contained "\v\\[1-9][0-9]*"
-syntax match   jsRegexpQuantifier   contained "\v\\@<!%([?*+]|\{\d+%(,|,\d+)?})\??"
-syntax match   jsRegexpOr           contained "\v\<@!\|"
-syntax match   jsRegexpMod          contained "\v\(@<=\?[:=!>]"
-syntax region  jsRegexpGroup        contained start="\\\@<!(" skip="\\.\|\[\(\\.\|[^]]\)*\]" end="\\\@<!)" contains=jsRegexpCharClass,@jsRegexpSpecial keepend
-if v:version > 703 || v:version == 603 && has("patch1088")
-  syntax region  jsRegexpString   start=+\%(\%(\%(return\|case\)\s\+\)\@50<=\|\%(\%([)\]"']\|\d\|\w\)\s*\)\@50<!\)/\(\*\|/\)\@!+ skip=+\\.\|\[\%(\\.\|[^]]\)*\]+ end=+/[gimyu]\{,5}+ contains=jsRegexpCharClass,jsRegexpGroup,@jsRegexpSpecial oneline keepend extend
-else
-  syntax region  jsRegexpString   start=+\%(\%(\%(return\|case\)\s\+\)\@<=\|\%(\%([)\]"']\|\d\|\w\)\s*\)\@<!\)/\(\*\|/\)\@!+ skip=+\\.\|\[\%(\\.\|[^]]\)*\]+ end=+/[gimyu]\{,5}+ contains=jsRegexpCharClass,jsRegexpGroup,@jsRegexpSpecial oneline keepend extend
-endif
+syntax region  jsRegexpCharClass    contained start=+\[+ skip=+\\.+ end=+\]+ contains=jsSpecial extend
+syntax match   jsRegexpBoundary     contained "\v\c[$^]|\\b"
+syntax match   jsRegexpBackRef      contained "\v\\[1-9]\d*"
+syntax match   jsRegexpQuantifier   contained "\v[^\\]%([?*+]|\{\d+%(,\d*)?})\??"lc=1
+syntax match   jsRegexpOr           contained "|"
+syntax match   jsRegexpMod          contained "\v\(\?[:=!>]"lc=1
+syntax region  jsRegexpGroup        contained start="[^\\]("lc=1 skip="\\.\|\[\(\\.\|[^]]\+\)\]" end=")" contains=jsRegexpCharClass,@jsRegexpSpecial keepend
+syntax region  jsRegexpString   start=+\%(\%(\<return\|\<typeof\|\_[^)\]'"[:blank:][:alnum:]_$]\)\s*\)\@<=/\ze[^*/]+ skip=+\\.\|\[[^]]\{1,}\]+ end=+/[gimyus]\{,6}+ contains=jsRegexpCharClass,jsRegexpGroup,@jsRegexpSpecial oneline keepend extend
 syntax cluster jsRegexpSpecial    contains=jsSpecial,jsRegexpBoundary,jsRegexpBackRef,jsRegexpQuantifier,jsRegexpOr,jsRegexpMod
 
 " Objects
-syntax match   jsObjectKey         contained /\<[0-9a-zA-Z_$]*\>\(\s*:\)\@=/ contains=jsFunctionKey skipwhite skipempty nextgroup=jsObjectValue
-syntax match   jsObjectColon       contained /:/ skipwhite skipempty
-syntax region  jsObjectKeyString   contained start=+"+  skip=+\\\("\|$\)+  end=+"\|$+  contains=jsSpecial,@Spell skipwhite skipempty nextgroup=jsObjectValue
-syntax region  jsObjectKeyString   contained start=+'+  skip=+\\\('\|$\)+  end=+'\|$+  contains=jsSpecial,@Spell skipwhite skipempty nextgroup=jsObjectValue
+syntax match   jsObjectShorthandProp contained /\<\k*\ze\s*/ skipwhite skipempty nextgroup=jsObjectSeparator
+syntax match   jsObjectKey         contained /\<\k*\ze\s*:/ contains=jsFunctionKey skipwhite skipempty nextgroup=jsObjectValue
+syntax region  jsObjectKeyString   contained start=+\z(["']\)+  skip=+\\\%(\z1\|$\)+  end=+\z1\|$+  contains=jsSpecial skipwhite skipempty nextgroup=jsObjectValue
 syntax region  jsObjectKeyComputed contained matchgroup=jsBrackets start=/\[/ end=/]/ contains=@jsExpression skipwhite skipempty nextgroup=jsObjectValue,jsFuncArgs extend
 syntax match   jsObjectSeparator   contained /,/
-syntax region  jsObjectValue       contained matchgroup=jsNoise start=/:/ end=/\%(,\|}\)\@=/ contains=@jsExpression extend
-syntax match   jsObjectFuncName    contained /\<[a-zA-Z_$][0-9a-zA-Z_$]*\>[\r\n\t ]*(\@=/ skipwhite skipempty nextgroup=jsFuncArgs
-syntax match   jsFunctionKey       contained /\<[a-zA-Z_$][0-9a-zA-Z_$]*\>\(\s*:\s*function\s*\)\@=/
-syntax match   jsObjectMethodType  contained /\%(get\|set\)\%( \k\+\)\@=/ skipwhite skipempty nextgroup=jsObjectFuncName
-syntax region  jsObjectStringKey   contained start=+"+  skip=+\\\("\|$\)+  end=+"\|$+  contains=jsSpecial,@Spell extend skipwhite skipempty nextgroup=jsFuncArgs,jsObjectValue
-syntax region  jsObjectStringKey   contained start=+'+  skip=+\\\('\|$\)+  end=+'\|$+  contains=jsSpecial,@Spell extend skipwhite skipempty nextgroup=jsFuncArgs,jsObjectValue
+syntax region  jsObjectValue       contained matchgroup=jsObjectColon start=/:/ end=/[,}]\@=/ contains=@jsExpression extend
+syntax match   jsObjectFuncName    contained /\<\K\k*\ze\_s*(/ skipwhite skipempty nextgroup=jsFuncArgs
+syntax match   jsFunctionKey       contained /\<\K\k*\ze\s*:\s*function\>/
+syntax match   jsObjectMethodType  contained /\<[gs]et\ze\s\+\K\k*/ skipwhite skipempty nextgroup=jsObjectFuncName
+syntax region  jsObjectStringKey   contained start=+\z(["']\)+  skip=+\\\%(\z1\|$\)+  end=+\z1\|$+  contains=jsSpecial extend skipwhite skipempty nextgroup=jsFuncArgs,jsObjectValue
 
 exe 'syntax keyword jsNull      null             '.(exists('g:javascript_conceal_null')      ? 'conceal cchar='.g:javascript_conceal_null       : '')
-exe 'syntax keyword jsReturn    return contained '.(exists('g:javascript_conceal_return')    ? 'conceal cchar='.g:javascript_conceal_return     : '').' skipwhite skipempty nextgroup=@jsExpression'
+exe 'syntax keyword jsReturn    return contained '.(exists('g:javascript_conceal_return')    ? 'conceal cchar='.g:javascript_conceal_return     : '').' skipwhite nextgroup=@jsExpression'
 exe 'syntax keyword jsUndefined undefined        '.(exists('g:javascript_conceal_undefined') ? 'conceal cchar='.g:javascript_conceal_undefined  : '')
 exe 'syntax keyword jsNan       NaN              '.(exists('g:javascript_conceal_NaN')       ? 'conceal cchar='.g:javascript_conceal_NaN        : '')
 exe 'syntax keyword jsPrototype prototype        '.(exists('g:javascript_conceal_prototype') ? 'conceal cchar='.g:javascript_conceal_prototype  : '')
@@ -99,25 +94,26 @@ exe 'syntax keyword jsThis      this             '.(exists('g:javascript_conceal
 exe 'syntax keyword jsSuper     super  contained '.(exists('g:javascript_conceal_super')     ? 'conceal cchar='.g:javascript_conceal_super      : '')
 
 " Statement Keywords
-syntax match   jsBlockLabel              /\<[a-zA-Z_$][0-9a-zA-Z_$]*\>\s*::\@!/    contains=jsNoise skipwhite skipempty nextgroup=jsBlock
-syntax match   jsBlockLabelKey contained /\<[a-zA-Z_$][0-9a-zA-Z_$]*\>\%(\s*\%(;\|\n\)\)\@=/
-syntax keyword jsStatement    contained with yield debugger
-syntax keyword jsStatement    contained break continue skipwhite skipempty nextgroup=jsBlockLabelKey
-syntax keyword jsConditional            if             skipwhite skipempty nextgroup=jsParenIfElse
-syntax keyword jsConditional            else           skipwhite skipempty nextgroup=jsCommentIfElse,jsIfElseBlock
-syntax keyword jsConditional            switch         skipwhite skipempty nextgroup=jsParenSwitch
-syntax keyword jsRepeat                 while for      skipwhite skipempty nextgroup=jsParenRepeat,jsForAwait
-syntax keyword jsDo                     do             skipwhite skipempty nextgroup=jsRepeatBlock
+syntax match   jsBlockLabel              /\<\K\k*\s*::\@!/    contains=jsNoise skipwhite skipempty nextgroup=jsBlock
+syntax match   jsBlockLabelKey contained /\<\K\k*\ze\s*\_[;]/
+syntax keyword jsStatement     contained with yield debugger
+syntax keyword jsStatement     contained break continue skipwhite skipempty nextgroup=jsBlockLabelKey
+syntax keyword jsConditional            if              skipwhite skipempty nextgroup=jsParenIfElse
+syntax keyword jsConditional            else            skipwhite skipempty nextgroup=jsCommentIfElse,jsIfElseBlock
+syntax keyword jsConditional            switch          skipwhite skipempty nextgroup=jsParenSwitch
+syntax keyword jsWhile                  while           skipwhite skipempty nextgroup=jsParenWhile
+syntax keyword jsFor                    for             skipwhite skipempty nextgroup=jsParenFor,jsForAwait
+syntax keyword jsDo                     do              skipwhite skipempty nextgroup=jsRepeatBlock
 syntax region  jsSwitchCase   contained matchgroup=jsLabel start=/\<\%(case\|default\)\>/ end=/:\@=/ contains=@jsExpression,jsLabel skipwhite skipempty nextgroup=jsSwitchColon keepend
-syntax keyword jsTry                    try            skipwhite skipempty nextgroup=jsTryCatchBlock
-syntax keyword jsFinally      contained finally        skipwhite skipempty nextgroup=jsFinallyBlock
-syntax keyword jsCatch        contained catch          skipwhite skipempty nextgroup=jsParenCatch
+syntax keyword jsTry                    try             skipwhite skipempty nextgroup=jsTryCatchBlock
+syntax keyword jsFinally      contained finally         skipwhite skipempty nextgroup=jsFinallyBlock
+syntax keyword jsCatch        contained catch           skipwhite skipempty nextgroup=jsParenCatch,jsTryCatchBlock
 syntax keyword jsException              throw
 syntax keyword jsAsyncKeyword           async await
-syntax match   jsSwitchColon   contained /::\@!/       skipwhite skipempty nextgroup=jsSwitchBlock
+syntax match   jsSwitchColon   contained /::\@!/        skipwhite skipempty nextgroup=jsSwitchBlock
 
 " Keywords
-syntax keyword jsGlobalObjects      Array Boolean Date Function Iterator Number Object Symbol Map WeakMap Set RegExp String Proxy Promise Buffer ParallelArray ArrayBuffer DataView Float32Array Float64Array Int16Array Int32Array Int8Array Uint16Array Uint32Array Uint8Array Uint8ClampedArray JSON Math console document window Intl Collator DateTimeFormat NumberFormat fetch
+syntax keyword jsGlobalObjects     ArrayBuffer Array BigInt BigInt64Array BigUint64Array Float32Array Float64Array Int16Array Int32Array Int8Array Uint16Array Uint32Array Uint8Array Uint8ClampedArray Boolean Buffer Collator DataView Date DateTimeFormat Function Intl Iterator JSON Map Set WeakMap WeakRef WeakSet Math Number NumberFormat Object ParallelArray Promise Proxy Reflect RegExp String Symbol Uint8ClampedArray WebAssembly console document fetch window
 syntax keyword jsGlobalNodeObjects  module exports global process __dirname __filename
 syntax match   jsGlobalNodeObjects  /\<require\>/ containedin=jsFuncCall
 syntax keyword jsExceptions         Error EvalError InternalError RangeError ReferenceError StopIteration SyntaxError TypeError URIError
@@ -141,89 +137,92 @@ syntax keyword jsHtmlEvents     onblur onclick oncontextmenu ondblclick onfocus
 
 " Code blocks
 syntax region  jsBracket                      matchgroup=jsBrackets            start=/\[/ end=/\]/ contains=@jsExpression,jsSpreadExpression extend fold
-syntax region  jsParen                        matchgroup=jsParens              start=/(/  end=/)/  contains=@jsAll extend fold
-syntax region  jsParenDecorator     contained matchgroup=jsParensDecorator     start=/(/  end=/)/  contains=@jsAll extend fold
-syntax region  jsParenIfElse        contained matchgroup=jsParensIfElse        start=/(/  end=/)/  contains=@jsAll skipwhite skipempty nextgroup=jsCommentIfElse,jsIfElseBlock extend fold
-syntax region  jsParenRepeat        contained matchgroup=jsParensRepeat        start=/(/  end=/)/  contains=@jsAll skipwhite skipempty nextgroup=jsCommentRepeat,jsRepeatBlock extend fold
-syntax region  jsParenSwitch        contained matchgroup=jsParensSwitch        start=/(/  end=/)/  contains=@jsAll skipwhite skipempty nextgroup=jsSwitchBlock extend fold
+syntax region  jsParen                        matchgroup=jsParens              start=/(/  end=/)/  contains=@jsExpression extend fold nextgroup=jsFlowDefinition
+syntax region  jsParenDecorator     contained matchgroup=jsParensDecorator     start=/(/  end=/)/  contains=@jsExpression extend fold
+syntax region  jsParenIfElse        contained matchgroup=jsParensIfElse        start=/(/  end=/)/  contains=@jsExpression skipwhite skipempty nextgroup=jsCommentIfElse,jsIfElseBlock,jsReturn extend fold
+syntax region  jsParenWhile         contained matchgroup=jsParensWhile         start=/(/  end=/)/  contains=@jsExpression skipwhite skipempty nextgroup=jsCommentRepeat,jsRepeatBlock,jsReturn extend fold
+syntax region  jsParenFor           contained matchgroup=jsParensFor           start=/(/  end=/)/  contains=@jsExpression,jsStorageClass,jsOf skipwhite skipempty nextgroup=jsCommentRepeat,jsRepeatBlock,jsReturn extend fold
+syntax region  jsParenSwitch        contained matchgroup=jsParensSwitch        start=/(/  end=/)/  contains=@jsExpression skipwhite skipempty nextgroup=jsSwitchBlock extend fold
 syntax region  jsParenCatch         contained matchgroup=jsParensCatch         start=/(/  end=/)/  skipwhite skipempty nextgroup=jsTryCatchBlock extend fold
 syntax region  jsFuncArgs           contained matchgroup=jsFuncParens          start=/(/  end=/)/  contains=jsFuncArgCommas,jsComment,jsFuncArgExpression,jsDestructuringBlock,jsDestructuringArray,jsRestExpression,jsFlowArgumentDef skipwhite skipempty nextgroup=jsCommentFunction,jsFuncBlock,jsFlowReturn extend fold
 syntax region  jsClassBlock         contained matchgroup=jsClassBraces         start=/{/  end=/}/  contains=jsClassFuncName,jsClassMethodType,jsArrowFunction,jsArrowFuncArgs,jsComment,jsGenerator,jsDecorator,jsClassProperty,jsClassPropertyComputed,jsClassStringKey,jsAsyncKeyword,jsNoise extend fold
-syntax region  jsFuncBlock          contained matchgroup=jsFuncBraces          start=/{/  end=/}/  contains=@jsAll,jsBlock extend fold
-syntax region  jsIfElseBlock        contained matchgroup=jsIfElseBraces        start=/{/  end=/}/  contains=@jsAll,jsBlock extend fold
-syntax region  jsTryCatchBlock      contained matchgroup=jsTryCatchBraces      start=/{/  end=/}/  contains=@jsAll,jsBlock skipwhite skipempty nextgroup=jsCatch,jsFinally extend fold
-syntax region  jsFinallyBlock       contained matchgroup=jsFinallyBraces       start=/{/  end=/}/  contains=@jsAll,jsBlock extend fold
-syntax region  jsSwitchBlock        contained matchgroup=jsSwitchBraces        start=/{/  end=/}/  contains=@jsAll,jsBlock,jsSwitchCase extend fold
-syntax region  jsRepeatBlock        contained matchgroup=jsRepeatBraces        start=/{/  end=/}/  contains=@jsAll,jsBlock extend fold
-syntax region  jsDestructuringBlock contained matchgroup=jsDestructuringBraces start=/{/  end=/}/  contains=jsDestructuringProperty,jsDestructuringAssignment,jsDestructuringNoise,jsDestructuringPropertyComputed,jsSpreadExpression,jsComment extend fold
-syntax region  jsDestructuringArray contained matchgroup=jsDestructuringBraces start=/\[/ end=/\]/ contains=jsDestructuringPropertyValue,jsNoise,jsDestructuringProperty,jsSpreadExpression,jsComment extend fold
-syntax region  jsObject             contained matchgroup=jsObjectBraces        start=/{/  end=/}/  contains=jsObjectKey,jsObjectKeyString,jsObjectKeyComputed,jsObjectSeparator,jsObjectFuncName,jsObjectMethodType,jsGenerator,jsComment,jsObjectStringKey,jsSpreadExpression,jsDecorator,jsAsyncKeyword extend fold
+syntax region  jsFuncBlock          contained matchgroup=jsFuncBraces          start=/{/  end=/}/  contains=@jsAll extend fold
+syntax region  jsIfElseBlock        contained matchgroup=jsIfElseBraces        start=/{/  end=/}/  contains=@jsAll extend fold
+syntax region  jsTryCatchBlock      contained matchgroup=jsTryCatchBraces      start=/{/  end=/}/  contains=@jsAll skipwhite skipempty nextgroup=jsCatch,jsFinally extend fold
+syntax region  jsFinallyBlock       contained matchgroup=jsFinallyBraces       start=/{/  end=/}/  contains=@jsAll extend fold
+syntax region  jsSwitchBlock        contained matchgroup=jsSwitchBraces        start=/{/  end=/}/  contains=@jsAll,jsSwitchCase extend fold
+syntax region  jsRepeatBlock        contained matchgroup=jsRepeatBraces        start=/{/  end=/}/  contains=@jsAll extend fold
+syntax region  jsDestructuringBlock contained matchgroup=jsDestructuringBraces start=/{/  end=/}/  contains=jsDestructuringProperty,jsDestructuringAssignment,jsDestructuringNoise,jsDestructuringPropertyComputed,jsSpreadExpression,jsComment nextgroup=jsFlowDefinition extend fold
+syntax region  jsDestructuringArray contained matchgroup=jsDestructuringBraces start=/\[/ end=/\]/ contains=jsDestructuringPropertyValue,jsDestructuringNoise,jsDestructuringProperty,jsSpreadExpression,jsDestructuringBlock,jsDestructuringArray,jsComment nextgroup=jsFlowDefinition extend fold
+syntax region  jsObject             contained matchgroup=jsObjectBraces        start=/{/  end=/}/  contains=jsObjectKey,jsObjectKeyString,jsObjectKeyComputed,jsObjectShorthandProp,jsObjectSeparator,jsObjectFuncName,jsObjectMethodType,jsGenerator,jsComment,jsObjectStringKey,jsSpreadExpression,jsDecorator,jsAsyncKeyword,jsTemplateString extend fold
 syntax region  jsBlock                        matchgroup=jsBraces              start=/{/  end=/}/  contains=@jsAll,jsSpreadExpression extend fold
-syntax region  jsModuleGroup        contained matchgroup=jsModuleBraces        start=/{/ end=/}/   contains=jsModuleKeyword,jsModuleComma,jsModuleAs,jsComment skipwhite skipempty nextgroup=jsFrom
+syntax region  jsModuleGroup        contained matchgroup=jsModuleBraces        start=/{/ end=/}/   contains=jsModuleKeyword,jsModuleComma,jsModuleAs,jsComment,jsFlowTypeKeyword skipwhite skipempty nextgroup=jsFrom fold
 syntax region  jsSpreadExpression   contained matchgroup=jsSpreadOperator      start=/\.\.\./ end=/[,}\]]\@=/ contains=@jsExpression
 syntax region  jsRestExpression     contained matchgroup=jsRestOperator        start=/\.\.\./ end=/[,)]\@=/
-syntax region  jsTernaryIf                    matchgroup=jsTernaryIfOperator   start=/?/  end=/\%(:\|[\}]\@=\)/  contains=@jsExpression extend skipwhite skipempty nextgroup=@jsExpression
+syntax region  jsTernaryIf                    matchgroup=jsTernaryIfOperator   start=/?:\@!/  end=/\%(:\|}\@=\)/  contains=@jsExpression extend skipwhite skipempty nextgroup=@jsExpression
+" These must occur here or they will be override by jsTernaryIf
+syntax match   jsOperator           /?\.\ze\_D/
+syntax match   jsOperator           /??/ skipwhite skipempty nextgroup=@jsExpression
 
-syntax match   jsGenerator            contained /\*/ skipwhite skipempty nextgroup=jsFuncName,jsFuncArgs
-syntax match   jsFuncName             contained /\<[a-zA-Z_$][0-9a-zA-Z_$]*\>/ skipwhite skipempty nextgroup=jsFuncArgs,jsFlowFunctionGroup
+syntax match   jsGenerator            contained /\*/ skipwhite skipempty nextgroup=jsFuncName,jsFuncArgs,jsFlowFunctionGroup
+syntax match   jsFuncName             contained /\<\K\k*/ skipwhite skipempty nextgroup=jsFuncArgs,jsFlowFunctionGroup
 syntax region  jsFuncArgExpression    contained matchgroup=jsFuncArgOperator start=/=/ end=/[,)]\@=/ contains=@jsExpression extend
 syntax match   jsFuncArgCommas        contained ','
 syntax keyword jsArguments            contained arguments
-syntax keyword jsForAwait             contained await skipwhite skipempty nextgroup=jsParenRepeat
+syntax keyword jsForAwait             contained await skipwhite skipempty nextgroup=jsParenFor
 
 " Matches a single keyword argument with no parens
-syntax match   jsArrowFuncArgs  /\k\+\s*\%(=>\)\@=/ skipwhite contains=jsFuncArgs skipwhite skipempty nextgroup=jsArrowFunction extend
+syntax match   jsArrowFuncArgs  /\<\K\k*\ze\s*=>/ skipwhite contains=jsFuncArgs skipwhite skipempty nextgroup=jsArrowFunction extend
 " Matches a series of arguments surrounded in parens
-syntax match   jsArrowFuncArgs  /([^()]*)\s*\(=>\)\@=/ contains=jsFuncArgs skipempty skipwhite nextgroup=jsArrowFunction extend
+syntax match   jsArrowFuncArgs  /([^()]*)\ze\s*=>/ contains=jsFuncArgs skipempty skipwhite nextgroup=jsArrowFunction extend
 
-exe 'syntax match jsFunction /\<function\>/ skipwhite skipempty nextgroup=jsGenerator,jsFuncName,jsFuncArgs skipwhite '.(exists('g:javascript_conceal_function')       ? 'conceal cchar='.g:javascript_conceal_function : '')
-exe 'syntax match jsArrowFunction /=>/      skipwhite skipempty nextgroup=jsFuncBlock,jsCommentFunction               '.(exists('g:javascript_conceal_arrow_function') ? 'conceal cchar='.g:javascript_conceal_arrow_function : '')
-exe 'syntax match jsArrowFunction /()\s*\(=>\)\@=/   skipwhite skipempty nextgroup=jsArrowFunction                    '.(exists('g:javascript_conceal_noarg_arrow_function') ? 'conceal cchar='.g:javascript_conceal_noarg_arrow_function : '').(' contains=jsArrowFuncArgs')
-exe 'syntax match jsArrowFunction /_\s*\(=>\)\@=/    skipwhite skipempty nextgroup=jsArrowFunction                    '.(exists('g:javascript_conceal_underscore_arrow_function') ? 'conceal cchar='.g:javascript_conceal_underscore_arrow_function : '')
+exe 'syntax match jsFunction /\<function\>/      skipwhite skipempty nextgroup=jsGenerator,jsFuncName,jsFuncArgs,jsFlowFunctionGroup skipwhite '.(exists('g:javascript_conceal_function') ? 'conceal cchar='.g:javascript_conceal_function : '')
+exe 'syntax match jsArrowFunction /=>/           skipwhite skipempty nextgroup=jsFuncBlock,jsCommentFunction '.(exists('g:javascript_conceal_arrow_function') ? 'conceal cchar='.g:javascript_conceal_arrow_function : '')
+exe 'syntax match jsArrowFunction /()\ze\s*=>/   skipwhite skipempty nextgroup=jsArrowFunction '.(exists('g:javascript_conceal_noarg_arrow_function') ? 'conceal cchar='.g:javascript_conceal_noarg_arrow_function : '')
+exe 'syntax match jsArrowFunction /_\ze\s*=>/    skipwhite skipempty nextgroup=jsArrowFunction '.(exists('g:javascript_conceal_underscore_arrow_function') ? 'conceal cchar='.g:javascript_conceal_underscore_arrow_function : '')
 
 " Classes
 syntax keyword jsClassKeyword           contained class
 syntax keyword jsExtendsKeyword         contained extends skipwhite skipempty nextgroup=@jsExpression
 syntax match   jsClassNoise             contained /\./
-syntax match   jsClassMethodType        contained /\%(get\|set\|static\)\%( \k\+\)\@=/ skipwhite skipempty nextgroup=jsAsyncKeyword,jsFuncName,jsClassProperty
-syntax region  jsClassDefinition                  start=/\<class\>/ end=/\(\<extends\>\s\+\)\@<!{\@=/ contains=jsClassKeyword,jsExtendsKeyword,jsClassNoise,@jsExpression skipwhite skipempty nextgroup=jsCommentClass,jsClassBlock,jsFlowClassGroup
-syntax match   jsClassProperty          contained /\<[0-9a-zA-Z_$]*\>\(\s*=\)\@=/ skipwhite skipempty nextgroup=jsClassValue
-syntax region  jsClassValue             contained start=/=/ end=/\%(;\|}\|\n\)\@=/ contains=@jsExpression
+syntax match   jsClassFuncName          contained /\<\K\k*\ze\s*[(<]/ skipwhite skipempty nextgroup=jsFuncArgs,jsFlowClassFunctionGroup
+syntax match   jsClassMethodType        contained /\<\%([gs]et\|static\)\ze\s\+\K\k*/ skipwhite skipempty nextgroup=jsAsyncKeyword,jsClassFuncName,jsClassProperty
+syntax region  jsClassDefinition                  start=/\<class\>/ end=/\(\<extends\>\s\+\)\@<!{\@=/ contains=jsClassKeyword,jsExtendsKeyword,jsClassNoise,@jsExpression,jsFlowClassGroup skipwhite skipempty nextgroup=jsCommentClass,jsClassBlock,jsFlowClassGroup
+syntax match   jsClassProperty          contained /\<\K\k*\ze\s*[=;]/ skipwhite skipempty nextgroup=jsClassValue,jsFlowClassDef
+syntax region  jsClassValue             contained start=/=/ end=/\_[;}]\@=/ contains=@jsExpression
 syntax region  jsClassPropertyComputed  contained matchgroup=jsBrackets start=/\[/ end=/]/ contains=@jsExpression skipwhite skipempty nextgroup=jsFuncArgs,jsClassValue extend
-syntax match   jsClassFuncName          contained /\<[a-zA-Z_$][0-9a-zA-Z_$]*\>\%(\s*(\)\@=/ skipwhite skipempty nextgroup=jsFuncArgs
-syntax region  jsClassStringKey         contained start=+"+  skip=+\\\("\|$\)+  end=+"\|$+  contains=jsSpecial,@Spell extend skipwhite skipempty nextgroup=jsFuncArgs
-syntax region  jsClassStringKey         contained start=+'+  skip=+\\\('\|$\)+  end=+'\|$+  contains=jsSpecial,@Spell extend skipwhite skipempty nextgroup=jsFuncArgs
+syntax region  jsClassStringKey         contained start=+\z(["']\)+  skip=+\\\%(\z1\|$\)+  end=+\z1\|$+  contains=jsSpecial extend skipwhite skipempty nextgroup=jsFuncArgs
 
 " Destructuring
-syntax match   jsDestructuringPropertyValue     contained /\<[0-9a-zA-Z_$]*\>/
-syntax match   jsDestructuringProperty          contained /\<[0-9a-zA-Z_$]*\>\(\s*=\)\@=/ skipwhite skipempty nextgroup=jsDestructuringValue
-syntax match   jsDestructuringAssignment        contained /\<[0-9a-zA-Z_$]*\>\(\s*:\)\@=/ skipwhite skipempty nextgroup=jsDestructuringValueAssignment
+syntax match   jsDestructuringPropertyValue     contained /\k\+/
+syntax match   jsDestructuringProperty          contained /\k\+\ze\s*=/ skipwhite skipempty nextgroup=jsDestructuringValue
+syntax match   jsDestructuringAssignment        contained /\k\+\ze\s*:/ skipwhite skipempty nextgroup=jsDestructuringValueAssignment
 syntax region  jsDestructuringValue             contained start=/=/ end=/[,}\]]\@=/ contains=@jsExpression extend
 syntax region  jsDestructuringValueAssignment   contained start=/:/ end=/[,}=]\@=/ contains=jsDestructuringPropertyValue,jsDestructuringBlock,jsNoise,jsDestructuringNoise skipwhite skipempty nextgroup=jsDestructuringValue extend
-syntax match   jsDestructuringNoise             contained /[,\[\]]/
-syntax region  jsDestructuringPropertyComputed  contained matchgroup=jsBrackets start=/\[/ end=/]/ contains=@jsExpression skipwhite skipempty nextgroup=jsDestructuringValue,jsDestructuringNoise extend fold
+syntax match   jsDestructuringNoise             contained /[,[\]]/
+syntax region  jsDestructuringPropertyComputed  contained matchgroup=jsDestructuringBraces start=/\[/ end=/]/ contains=@jsExpression skipwhite skipempty nextgroup=jsDestructuringValue,jsDestructuringValueAssignment,jsDestructuringNoise extend fold
 
 " Comments
-syntax keyword jsCommentTodo    contained TODO FIXME XXX TBD
-syntax region  jsComment        start=/\/\// end=/$/ contains=jsCommentTodo,@Spell extend keepend
-syntax region  jsComment        start=/\/\*/  end=/\*\// contains=jsCommentTodo,@Spell fold extend keepend
+syntax keyword jsCommentTodo    contained TODO FIXME XXX TBD NOTE
+syntax region  jsComment        start=+//+ end=/$/ contains=jsCommentTodo,@Spell extend keepend
+syntax region  jsComment        start=+/\*+  end=+\*/+ contains=jsCommentTodo,@Spell fold extend keepend
 syntax region  jsEnvComment     start=/\%^#!/ end=/$/ display
 
 " Specialized Comments - These are special comment regexes that are used in
 " odd places that maintain the proper nextgroup functionality. It sucks we
 " can't make jsComment a skippable type of group for nextgroup
-syntax region  jsCommentFunction    contained start=/\/\// end=/$/    contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsFuncBlock,jsFlowReturn extend keepend
-syntax region  jsCommentFunction    contained start=/\/\*/ end=/\*\// contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsFuncBlock,jsFlowReturn fold extend keepend
-syntax region  jsCommentClass       contained start=/\/\// end=/$/    contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsClassBlock,jsFlowClassGroup extend keepend
-syntax region  jsCommentClass       contained start=/\/\*/ end=/\*\// contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsClassBlock,jsFlowClassGroup fold extend keepend
-syntax region  jsCommentIfElse      contained start=/\/\// end=/$/    contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsIfElseBlock extend keepend
-syntax region  jsCommentIfElse      contained start=/\/\*/ end=/\*\// contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsIfElseBlock fold extend keepend
-syntax region  jsCommentRepeat      contained start=/\/\// end=/$/    contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsRepeatBlock extend keepend
-syntax region  jsCommentRepeat      contained start=/\/\*/ end=/\*\// contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsRepeatBlock fold extend keepend
+syntax region  jsCommentFunction    contained start=+//+ end=/$/    contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsFuncBlock,jsFlowReturn extend keepend
+syntax region  jsCommentFunction    contained start=+/\*+ end=+\*/+ contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsFuncBlock,jsFlowReturn fold extend keepend
+syntax region  jsCommentClass       contained start=+//+ end=/$/    contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsClassBlock,jsFlowClassGroup extend keepend
+syntax region  jsCommentClass       contained start=+/\*+ end=+\*/+ contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsClassBlock,jsFlowClassGroup fold extend keepend
+syntax region  jsCommentIfElse      contained start=+//+ end=/$/    contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsIfElseBlock extend keepend
+syntax region  jsCommentIfElse      contained start=+/\*+ end=+\*/+ contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsIfElseBlock fold extend keepend
+syntax region  jsCommentRepeat      contained start=+//+ end=/$/    contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsRepeatBlock extend keepend
+syntax region  jsCommentRepeat      contained start=+/\*+ end=+\*/+ contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsRepeatBlock fold extend keepend
 
 " Decorators
 syntax match   jsDecorator                    /^\s*@/ nextgroup=jsDecoratorFunction
-syntax match   jsDecoratorFunction  contained /[a-zA-Z_][a-zA-Z0-9_.]*/ nextgroup=jsParenDecorator
+syntax match   jsDecoratorFunction  contained /\h[a-zA-Z0-9_.]*/ nextgroup=jsParenDecorator
 
 if exists("javascript_plugin_jsdoc")
   runtime extras/jsdoc.vim
@@ -237,8 +236,8 @@ if exists("javascript_plugin_flow")
   runtime extras/flow.vim
 endif
 
-syntax cluster jsExpression  contains=jsBracket,jsParen,jsObject,jsTernaryIf,jsTaggedTemplate,jsTemplateString,jsString,jsRegexpString,jsNumber,jsFloat,jsOperator,jsBooleanTrue,jsBooleanFalse,jsNull,jsFunction,jsArrowFunction,jsGlobalObjects,jsExceptions,jsFutureKeys,jsDomErrNo,jsDomNodeConsts,jsHtmlEvents,jsFuncCall,jsUndefined,jsNan,jsPrototype,jsBuiltins,jsNoise,jsClassDefinition,jsArrowFunction,jsArrowFuncArgs,jsParensError,jsComment,jsArguments,jsThis,jsSuper,jsDo,jsForAwait
-syntax cluster jsAll         contains=@jsExpression,jsStorageClass,jsConditional,jsRepeat,jsReturn,jsStatement,jsException,jsTry,jsAsyncKeyword,jsNoise,jsBlockLabel
+syntax cluster jsExpression  contains=jsBracket,jsParen,jsObject,jsTernaryIf,jsTaggedTemplate,jsTemplateString,jsString,jsRegexpString,jsNumber,jsFloat,jsOperator,jsOperatorKeyword,jsBooleanTrue,jsBooleanFalse,jsNull,jsFunction,jsArrowFunction,jsGlobalObjects,jsExceptions,jsFutureKeys,jsDomErrNo,jsDomNodeConsts,jsHtmlEvents,jsFuncCall,jsUndefined,jsNan,jsPrototype,jsBuiltins,jsNoise,jsClassDefinition,jsArrowFunction,jsArrowFuncArgs,jsParensError,jsComment,jsArguments,jsThis,jsSuper,jsDo,jsForAwait,jsAsyncKeyword,jsStatement,jsDot
+syntax cluster jsAll         contains=@jsExpression,jsStorageClass,jsConditional,jsWhile,jsFor,jsReturn,jsException,jsTry,jsNoise,jsBlockLabel,jsBlock
 
 " Define the default highlighting.
 " For version 5.7 and earlier: only when not done already
@@ -253,6 +252,8 @@ if version >= 508 || !exists("did_javascript_syn_inits")
   HiLink jsComment              Comment
   HiLink jsEnvComment           PreProc
   HiLink jsParensIfElse         jsParens
+  HiLink jsParensWhile          jsParensRepeat
+  HiLink jsParensFor            jsParensRepeat
   HiLink jsParensRepeat         jsParens
   HiLink jsParensSwitch         jsParens
   HiLink jsParensCatch          jsParens
@@ -278,6 +279,8 @@ if version >= 508 || !exists("did_javascript_syn_inits")
   HiLink jsBranch               Conditional
   HiLink jsLabel                Label
   HiLink jsReturn               Statement
+  HiLink jsWhile                jsRepeat
+  HiLink jsFor                  jsRepeat
   HiLink jsRepeat               Repeat
   HiLink jsDo                   Repeat
   HiLink jsStatement            Statement
@@ -292,11 +295,13 @@ if version >= 508 || !exists("did_javascript_syn_inits")
   HiLink jsGenerator            jsFunction
   HiLink jsArrowFuncArgs        jsFuncArgs
   HiLink jsFuncName             Function
+  HiLink jsFuncCall             Function
   HiLink jsClassFuncName        jsFuncName
   HiLink jsObjectFuncName       Function
   HiLink jsArguments            Special
   HiLink jsError                Error
   HiLink jsParensError          Error
+  HiLink jsOperatorKeyword      jsOperator
   HiLink jsOperator             Operator
   HiLink jsOf                   Operator
   HiLink jsStorageClass         StorageClass
@@ -313,6 +318,7 @@ if version >= 508 || !exists("did_javascript_syn_inits")
   HiLink jsBooleanFalse         Boolean
   HiLink jsObjectColon          jsNoise
   HiLink jsNoise                Noise
+  HiLink jsDot                  Noise
   HiLink jsBrackets             Noise
   HiLink jsParens               Noise
   HiLink jsBraces               Noise
@@ -347,6 +353,7 @@ if version >= 508 || !exists("did_javascript_syn_inits")
   HiLink jsParensDecorator      jsParens
   HiLink jsFuncArgOperator      jsFuncArgs
   HiLink jsClassProperty        jsObjectKey
+  HiLink jsObjectShorthandProp  jsObjectKey
   HiLink jsSpreadOperator       Operator
   HiLink jsRestOperator         Operator
   HiLink jsRestExpression       jsFuncArgs