Fixes for Flow on Classes

Author: amadeus

extras/flow.vim

@@ -12,6 +12,7 @@ syntax match   jsFlowNoise          contained /[:;,<>]/
 syntax cluster jsFlowCluster        contains=jsFlowType,jsFlowArray,jsFlowObject,jsFlowNoise
 syntax keyword jsFlowStorageClass   contained const var let
 syntax region  jsFlowParenRegion    contained start=/:\s*(/ end=/)\%(\s*:\)\@=/ oneline contains=@jsFlowCluster skipwhite skipempty nextgroup=jsObjectValue
+syntax region  jsFlowClass          contained matchgroup=jsFlowNoise start=/</ end=/>/ oneline contains=@jsFlowCluster skipwhite skipempty nextgroup=jsClassBlock
 
 if version >= 508 || !exists("did_javascript_syn_inits")
   if version < 508
@@ -26,6 +27,7 @@ if version >= 508 || !exists("did_javascript_syn_inits")
   HiLink jsFlowDeclareBlock       PreProc
   HiLink jsFlowObject             PreProc
   HiLink jsFlowParenRegion        PreProc
+  HiLink jsFlowClass              PreProc
   HiLink jsFlowType               Type
   HiLink jsFlowDeclareKeyword     Type
   HiLink jsFlowNoise              Noise

syntax/javascript.vim

@@ -165,7 +165,7 @@ exe 'syntax match jsArrowFunction /=>/      skipwhite skipempty nextgroup=jsFunc
 syntax keyword jsClassKeywords          contained extends class
 syntax match   jsClassNoise             contained /\./
 syntax match   jsClassMethodDefinitions contained /\%(get\|set\|static\)\%( \k\+\)\@=/ skipwhite skipempty nextgroup=jsFuncName,jsClassProperty
-syntax match   jsClassDefinition        /\<class\>\%( [a-zA-Z_$][0-9a-zA-Z_$ \n.]*\)*/ contains=jsClassKeywords,jsClassNoise skipwhite skipempty nextgroup=jsClassBlock
+syntax match   jsClassDefinition        /\<class\>\%( [a-zA-Z_$][0-9a-zA-Z_$ \n.]*\)*/ contains=jsClassKeywords,jsClassNoise skipwhite skipempty nextgroup=jsClassBlock,jsFlowClass
 syntax match   jsDecorator              contained "@" nextgroup=jsDecoratorFunction
 syntax match   jsDecoratorFunction      contained "[a-zA-Z_][a-zA-Z0-9_.]*"
 syntax match   jsClassProperty          contained /\<[0-9a-zA-Z_$]*\>\(\s*=\)\@=/ skipwhite skipempty nextgroup=jsClassValue