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fake this type for function this argument is not handled #10138

jounii opened this issue Jun 28, 2019 · 1 comment


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commented Jun 28, 2019

Bug Report

Current Behavior

If providing Typescript function fake this type ('s-new-in-TypeScript#specifying-the-type-of-this-for-functions) it is treated as real argument even though it should be omitted. Current functionality makes it impossible to type this.

function fakethis(this: any, ...args: any[]) {

Expected behavior/code

As per Typescript typings, the "this: any" argument should be treated as it was not there and "...args" should contain all given arguments and not just starting from the second argument.


  • Babel version(s): 7.0.0-bridge.0
  • Node/npm version: v12.4.0
  • OS: macOS 10.14.5
  • How you are using Babel: React Native metro

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commented Jun 28, 2019

Hey @jounii! We really appreciate you taking the time to report an issue. The collaborators
on this project attempt to help as many people as possible, but we're a limited number of volunteers,
so it's possible this won't be addressed swiftly.

If you need any help, or just have general Babel or JavaScript questions, we have a vibrant Slack
that typically always has someone willing to help. You can sign-up here
for an invite.

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