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JestRuntime:-Using scriptTransformer cache in jest-runner #13735

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Merged
merged 3 commits into from
Jan 7, 2023
Merged

JestRuntime:-Using scriptTransformer cache in jest-runner #13735

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3ec9e05
Using scriptTransformer cache in jest-runner
Biki-das Jan 5, 2023
503d86f
Removed transformed files import
Biki-das Jan 5, 2023
99093ae
Removed the if condition and Added the changelog
Biki-das Jan 7, 2023
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Using scriptTransformer cache in jest-runner
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@Biki-das
Biki-das committed Jan 5, 2023
commit 3ec9e057e34a0cb71d0b0b3c9e895f54947beecb
38 changes: 14 additions & 24 deletions packages/jest-runtime/src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -1574,23 +1574,18 @@ export default class Runtime {
return source;
}

let transformedFile: TransformResult | undefined =
this._fileTransforms.get(filename);

if (transformedFile) {
return transformedFile.code;
}

transformedFile = this._scriptTransformer.transform(
const transformedFile = this._scriptTransformer.transform(
filename,
this._getFullTransformationOptions(options),
source,
);

this._fileTransforms.set(filename, {
...transformedFile,
wrapperLength: this.constructModuleWrapperStart().length,
});
if (this._fileTransforms.get(filename)?.code !== transformedFile.code) {
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I think you can remove this if and just always populate the cache. Then it's a single set instead of a single get and sometimes an additional set

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yeah that way we can prevent the additional set

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@SimenB SimenB Jan 6, 2023 •
edited
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a set isn't more expensive than get (just the extra spread in the object). and a single set is less expensive than get and set

this._fileTransforms.set(filename, {
...transformedFile,
wrapperLength: this.constructModuleWrapperStart().length,
});
}

if (transformedFile.sourceMapPath) {
this._sourceMapRegistry.set(filename, transformedFile.sourceMapPath);
Expand All @@ -1608,23 +1603,18 @@ export default class Runtime {
return source;
}

let transformedFile: TransformResult | undefined =
this._fileTransforms.get(filename);

if (transformedFile) {
return transformedFile.code;
}

transformedFile = await this._scriptTransformer.transformAsync(
const transformedFile = await this._scriptTransformer.transformAsync(
filename,
this._getFullTransformationOptions(options),
source,
);

this._fileTransforms.set(filename, {
...transformedFile,
wrapperLength: 0,
});
if (this._fileTransforms.get(filename)?.code !== transformedFile.code) {
this._fileTransforms.set(filename, {
...transformedFile,
wrapperLength: 0,
});
}

if (transformedFile.sourceMapPath) {
this._sourceMapRegistry.set(filename, transformedFile.sourceMapPath);
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