diff --git a/extras/flow.vim b/extras/flow.vim
index 6ae9b901..3b4036da 100644
--- a/extras/flow.vim
+++ b/extras/flow.vim
@@ -1,15 +1,18 @@
 syntax region  jsFlowTypeStatement            start=/type/    end=/=/     oneline skipwhite skipempty nextgroup=jsFlowTypeObject
 syntax region  jsFlowDeclareBlock             start=/declare/ end=/[;\n]/ oneline contains=jsFlow,jsFlowDeclareKeyword,jsFlowStorageClass
 syntax region  jsFlow                         start=/:/       end=/\%(\%([),=;\n]\|{\%(.*}\)\@!\|\%({.*}\)\@<=\s*{\)\@=\|void\)/ contains=@jsFlowCluster oneline skipwhite skipempty nextgroup=jsFuncBlock
-syntax region  jsFlowReturn         contained start=/:/       end=/\%(\S\s*\%({\)\@=\|\n\)/ contains=@jsFlowCluster oneline skipwhite skipempty nextgroup=jsFuncBlock keepend
-syntax region  jsFlowTypeObject     contained start=/{/       end=/}/     skipwhite skipempty nextgroup=jsFunctionBlock extend
+syntax region  jsFlowReturn         contained start=/:/       end=/\%(\S\s*\%({\%(.*}\)\@!\)\@=\|\n\)/ contains=@jsFlowCluster oneline skipwhite skipempty nextgroup=jsFuncBlock keepend
+syntax region  jsFlowTypeObject     contained start=/{/       end=/}/ contains=jsFlowTypeKey skipwhite skipempty nextgroup=jsFunctionBlock extend
+syntax match   jsFlowTypeKey        contained /\<[0-9a-zA-Z_$?]*\>\(\s*:\)\@=/ skipwhite skipempty nextgroup=jsFlowTypeValue
+syntax region  jsFlowTypeValue      contained matchgroup=jsFlowNoise start=/:/       end=/[,}]/ contains=@jsFlowCluster
 syntax region  jsFlowObject         contained matchgroup=jsFlowNoise start=/{/       end=/}/     oneline contains=@jsFlowCluster
 syntax region  jsFlowArray          contained matchgroup=jsFlowNoise start=/\[/      end=/\]/    oneline contains=@jsFlowCluster
+syntax region  jsFlowArrow          contained matchgroup=jsFlowNoise start=/(/       end=/)\s*=>/     oneline contains=@jsFlowCluster
 syntax keyword jsFlowDeclareKeyword contained declare
 syntax keyword jsFlowType           contained boolean number string null void any mixed JSON array function object Array
 syntax match   jsFlowClassProperty  contained /\<[0-9a-zA-Z_$]*\>:\@=/ skipwhite skipempty nextgroup=jsFlow
 syntax match   jsFlowNoise          contained /[:;,<>]/
-syntax cluster jsFlowCluster        contains=jsFlowType,jsFlowArray,jsFlowObject,jsFlowNoise
+syntax cluster jsFlowCluster        contains=jsFlowType,jsFlowArray,jsFlowObject,jsFlowNoise,jsFlowArrow
 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
@@ -28,6 +31,9 @@ if version >= 508 || !exists("did_javascript_syn_inits")
   HiLink jsFlowObject             PreProc
   HiLink jsFlowParenRegion        PreProc
   HiLink jsFlowClass              PreProc
+  HiLink jsFlowTypeObject         PreProc
+  HiLink jsFlowTypeKey            PreProc
+  HiLink jsFlowTypeValue          PreProc
   HiLink jsFlowClassProperty      jsClassProperty
   HiLink jsFlowType               Type
   HiLink jsFlowDeclareKeyword     Type