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[Reopen]_typeof function in generated code calls itself before it is defined (T7149) #10662

shrinktofit opened this issue Nov 6, 2019 · 2 comments


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@shrinktofit shrinktofit commented Nov 6, 2019

It's a reopen of ISSUE #4125.

I have found a reproducible example. My transform code:

const babel = require('@babel/core');
const fs = require('fs');
(async () => {
	const result = await babel.transformFileAsync('predefine.ts', {
		presets: [
		    ["@babel/preset-env", { modules: 'umd' }],
	fs.writeFileSync("_typeof_out.js", result.code);

Generated code:

babel version: 7.6.4
transform-modules-umd version:7.7.0, but 7.2.0 does not reference _typeof before declare it



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@babel-bot babel-bot commented Nov 6, 2019

Hey @shrinktofit! 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 community that typically always has someone willing to help. You can sign-up here for an invite."


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@shrinktofit shrinktofit commented Nov 6, 2019

The error disappear if the original source doesn't contains typeof keyword.

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