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WebStorm doesn't yet include predefined libraries for EcmaScript6, so  the types introduced in ES6 API are not known to it. Please follow

https://youtrack.jetbrains.com/issue/WEB-11478 for updates.
As a workaround I can suggest creating a new .js file with the  corresponding stubs and passing it to WebStorm (as a javascript  library).Open  plugins\JavaScriptLanguage\lib\JavaScriptLanguage.jar!\com\intellij\lang\javascript\index\predefined\EcmaScript.js  file in editor to see what such stubs may look like

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