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I'm working in PhpStorm on a Vue 2 / TypeScript project where whenever I want to include return types on functions I get "Types are not supported by current JavaScript version":

Types are not supported by current JavaScript version

On "Preferences > Languages and Frameworks > JavaScript", I have ECMAScript 6+ selected:

selected

I've tried restarting the IDE to no avail.

Any ideas?

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  • 4
    JavaScript doesn't have type annotations. You need to use Flow or TypeScript or (potentially) other things that allow for using types. Commented May 19, 2021 at 8:39
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    just modify file extension. replace js with ts Commented May 19, 2021 at 9:11
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    Such a weird error message really. I mean, it is as if types are just about to be supported in the nearest version of JavaScript. Commented May 19, 2021 at 9:12
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    @DimaParzhitsky I agree. VSCode has the better one Type annotations can only be used in TypeScript files Commented May 19, 2021 at 9:14

2 Answers 2

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Ah, apparently I was misled by the wording of the error message. Simply adding <script lang="ts"> inside my vue files has fixed it.

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1 Comment

exactly - without lang attribute, the <script> language is assumed to be javascript, thus the message
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I had the same error, but it happened because I was writing Typescript code in a .js file instead of .ts file.

  1. Rename .js to .ts
  2. Make sure you have the Javascript language version set to ECMAScript 6+ under Languages & Frameworks > Javascript in your Jetbrain IDE.
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1 Comment

thanks Hyder! this helped me in Webstorm. My extension was .js instead of .ts out of habit.

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