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feat(jest-runtime): share cacheFS between runtime and transformer #10901

Merged
merged 2 commits into from Dec 5, 2020
Merged

feat(jest-runtime): share cacheFS between runtime and transformer #10901

merged 2 commits into from Dec 5, 2020

Commits on Dec 5, 2020

  1. feat(jest-runtime): share cacheFS between runtime and transformer 

    Pass `cacheFS` from `jest-runtime` to `ScriptTransformer`. When `getCacheKey` or `process` is invoked, this `cacheFS` is passed in through transform options

If a transformer does module resolution and reads files, it should populate `cacheFS` so that Jest avoids reading the same files again, improving performance. `cacheFS` stores entries of <file path, file contents>

Closes #10898
    @ahnpnl
    ahnpnl committed Dec 5, 2020
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  2. Update CodeTransformation.md

    @SimenB
    SimenB committed Dec 5, 2020
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