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fix(@angular-devkit/build-angular): transform remapped sourcemap into a plain object #22220

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Nov 23, 2021
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fix(@angular-devkit/build-angular): transform remapped sourcemap into a plain object #22220

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14 changes: 10 additions & 4 deletions 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 @@ -239,10 +239,16 @@ export default custom<ApplicationPresetOptions>(() => {
// `@ampproject/remapping` source map objects but both are compatible with Webpack.
// This method for merging is used because it provides more accurate output
// and is faster while using less memory.
result.map = remapping(
[result.map as SourceMapInput, inputSourceMap as SourceMapInput],
() => null,
) as typeof result.map;
result.map = {
// Convert the SourceMap back to simple plain object.
// This is needed because otherwise code-coverage will fail with `don't know how to turn this value into a node`
// Which is thrown by Babel if it is invoked again from `istanbul-lib-instrument`.
// https://github.com/babel/babel/blob/780aa48d2a34dc55f556843074b6aed45e7eabeb/packages/babel-types/src/converters/valueToNode.ts#L115-L130
...(remapping(
[result.map as SourceMapInput, inputSourceMap as SourceMapInput],
() => null,
) as typeof result.map),
};
}

return result;
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