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always throw when add missing helpers #10208

merged 1 commit into from Jul 12, 2019


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@tanhauhau tanhauhau commented Jul 12, 2019

Q                       A
Fixed Issues? Fixes #10187
Patch: Bug Fix? 👍
Major: Breaking Change?
Minor: New Feature?
Tests Added + Pass? Yes
Documentation PR Link
Any Dependency Changes?
License MIT

The problem with current addHelper is that this line will get execute first, before knowing whether the helper existed:

// 2) will short circuit if `this.declarations[name]` exists
const declar = this.declarations[name];
if (declar) return t.cloneNode(declar);

// 1) will set this.declarations[name] no matter helper exists
const uid = (this.declarations[name] = this.scope.generateUidIdentifier(

so i added a helpers.ensure(name) before (1).

Since loadHelper is cached, it's okay to call it multiple times.

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@babel-bot babel-bot commented Jul 12, 2019

Build successful! You can test your changes in the REPL here:

@existentialism existentialism merged commit f5ca058 into babel:master Jul 12, 2019
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@nicolo-ribaudo nicolo-ribaudo commented Jul 12, 2019

Related: #10200

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5 participants