Attempt some semblance of better typescript highlighting

vim/after/syntax/javascript.vim

@@ -0,0 +1,37 @@
+" Remove interface from future keys
+syn clear   jsFutureKeys
+syn keyword jsFutureKeys      final implements goto long synchronized volatile transient float boolean protected abstract native double short char enum throws byte int package
+
+syn keyword tsAccessibility   public private
+syn keyword tsPrimitives      string any number object
+syn keyword tsInterface       interface nextgroup=tsInterfaceType,jsExtend skipwhite
+syn keyword jsExtend          extends nextgroup=tsInterfaceType skipwhite
+syn match   tsInterfaceType   /\w\+/ nextgroup=jsBlock skipwhite contained
+
+syn keyword jsExport          export nextgroup=@jsAll,jsModuleGroup,jsExportDefault,jsModuleAsterisk,jsModuleKeyword,jsFlowTypeStatement,tsInterface  skipwhite skipempty
+syn region  jsClassBlock      matchgroup=jsClassBraces start=/{/ end=/}/  contained extend fold contains=jsClassFuncName,jsClassMethodType,jsArrowFunction,jsArrowFuncArgs,jsComment,jsGenerator,jsDecorator,jsClassProperty,jsClassPropertyComputed,jsClassStringKey,jsAsyncKeyword,jsNoise,tsAccessibility
+syn region  jsFuncArgs        matchgroup=jsFuncParens start=/(/ end=/)/  contains=jsFuncArgCommas,jsComment,jsFuncArgExpression,jsDestructuringBlock,jsDestructuringArray,jsRestExpression,jsFlowArgumentDef,tsVariableType nextgroup=jsCommentFunction,jsFuncBlock,jsFlowReturn,tsFuncReturnType skipwhite skipempty contained extend fold
+"syn region jsCommentFunction start=+//+ end=/$/  contained keepend extend contains=jsCommentTodo,@Spell nextgroup=jsFuncBlock,jsFlowReturn skipwhite skipempty start=+/\*+ end=+\*/+  contained keepend extend fold contains=jsCommentTodo,@Spell nextgroup=jsFuncBlock,jsFlowReturn skipwhite skipempty
+"syn match  jsClassFuncName   /\<\K\k*\ze\s*[(<]/  nextgroup=jsFuncArgs,jsFlowClassFunctionGroup skipwhite contained skipempty
+syn match   jsVariableDef     /\<\K\k*/  nextgroup=jsFlowDefinition,tsVariableType skipwhite skipempty contained
+syn match   jsBlockLabel      /\<\K\k*?\?\s*::\@!/  contains=jsNoise nextgroup=jsBlock skipwhite skipempty
+
+syn match   tsVariableType    /:\s\+\w\+\(.\w\+\)*/ nextgroup=jsFlowDefinition contains=tsTypeDecl,tsType skipwhite contained
+syn match   tsFuncReturnType  /:\s\+\w\+\(.\w\+\)*/ nextgroup=jsCommentFunction,jsFuncBlock,jsFlowReturn,jsFuncBraces contains=tsTypeDecl,tsType skipwhite contained
+syn match   tsTypeDecl        /:/ contained nextgroup=tsType
+syn match   tsType            /\w\+(\.\w\+)*/ contained
+
+" Override the default definitions, adding/removing as necessary
+syn cluster jsAll           contains=@jsExpression,jsStorageClass,jsConditional,jsRepeat,jsReturn,jsException,jsTry,jsNoise,jsBlockLabel,tsPrimitives
+
+hi link jsObjectKey Special
+hi link jsClassDefinition Type
+hi link jsFutureKeys Keyword
+hi link tsInterface Keyword
+hi link tsAccessibility Keyword
+hi link jsExtend Keyword
+hi link tsInterfaceType Type
+hi link tsPrimitives Special
+hi link tsType Type
+hi link tsFuncReturnType tsType
+hi link tsVariableType tsType