fix: skip merging large input sourcemaps #10890
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JLHwung
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PR: Bug Fix 🐛
| // when `lastComment` is non-null, EXTERNAL_SOURCEMAP_REGEX must have matches | ||
| const match: [string, string] = (EXTERNAL_SOURCEMAP_REGEX.exec( | ||
| lastComment, | ||
| ): any); |
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Is this guaranteed to never return null?
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Yes because the capturing group
([^\s'"`]+)
has a + quantifier, if the whole regex passed, the capturing group must not be null.
|
@nicolo-ribaudo Correct. I have tested on |
nicolo-ribaudo
approved these changes
Dec 18, 2019
existentialism
approved these changes
Dec 19, 2019
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This PR addresses #10875 where a large input source map is consumed and causing OOM error. It is not an ideal fix but still preserve basic support for practical size input source map.
Note that #10885 misidentified the memory bottleneck. But I preserve the change here since we need to detect the source map file size.
Ideally the mergeSourceMap in babel generator should operate in a streaming mode. But this does not fit in a patch release.
I don't consider it as a regression since in 7.6.4 the
inputSourceMapis not working properly on external sourcemaps.@artisb45 @midgethoen Though the URL does not change, here is a new fix. You can download it and overwrite
node_modules/@babel/core/lib/transformation/normalize-file.js.