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fix(@angular-devkit/build-angular): ensure native async is downlevelled in third-party libraries #21552

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Aug 11, 2021
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fix(@angular-devkit/build-angular): ensure native async is downlevelled in third-party libraries #21552

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6 changes: 5 additions & 1 deletion packages/angular_devkit/build_angular/src/babel/webpack-loader.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -67,7 +67,11 @@ export default custom<AngularCustomOptions>(() => {
if (esTarget !== undefined) {
if (esTarget < ScriptTarget.ES2015) {
customOptions.forceES5 = true;
} else if (esTarget >= ScriptTarget.ES2017) {
} else if (esTarget >= ScriptTarget.ES2017 || /\.[cm]?js$/.test(this.resourcePath)) {
// Application code (TS files) will only contain native async if target is ES2017+.
// However, third-party libraries can regardless of the target option.
// APF packages with code in [f]esm2015 directories is downlevelled to ES2015 and
// will not have native async.
customOptions.forceAsyncTransformation =
!/[\\\/][_f]?esm2015[\\\/]/.test(this.resourcePath) && source.includes('async');
}
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