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[TypeScript] SyntaxError on array destructuring #10066

jj-choi opened this issue Jun 7, 2019 · 3 comments


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commented Jun 7, 2019

Bug Report

Current Behavior
SyntaxError: Unexpected type cast in parameter position

Input Code

[x as Foo] = arr

Expected behavior/code
no error

Babel Configuration (.babelrc, package.json, cli command)
@babel/parser with typescript plugin


  • Babel version(s): 7.4.5
  • Node/npm version: Node 11.13 / npm 6.7

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commented Jun 7, 2019

Hey @jj-choi! 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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commented Jun 14, 2019

I don't think it's a valid typescript syntax: TypeScript playground


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commented Jun 17, 2019

Its a valid assignment statement.

function foo (arr: [number]) {
    let x;
    [x as number] = arr;
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