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feat: pass ESM options to transformers #9597

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merged 1 commit into from Apr 5, 2020
Merged

feat: pass ESM options to transformers #9597

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1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -3,6 +3,7 @@
### Features

- `[babel-jest]` Support passing `supportsDynamicImport` and `supportsStaticESM` ([#9766](https://github.com/facebook/jest/pull/9766))
- `[jest-runtime, @jest/transformer]` Support passing `supportsDynamicImport` and `supportsStaticESM` ([#9597](https://github.com/facebook/jest/pull/9597))

### Fixes

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16 changes: 14 additions & 2 deletions packages/jest-runtime/src/index.ts
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Expand Up @@ -52,6 +52,14 @@ type HasteMapOptions = {

type InternalModuleOptions = {
isInternalModule: boolean;
supportsDynamicImport: boolean;
supportsStaticESM: boolean;
};

const defaultTransformOptions: InternalModuleOptions = {
isInternalModule: false,
supportsDynamicImport: false,
supportsStaticESM: false,
};

type InitialModule = Partial<Module> &
Expand Down Expand Up @@ -368,7 +376,11 @@ class Runtime {
}

requireInternalModule<T = unknown>(from: Config.Path, to?: string): T {
return this.requireModule(from, to, {isInternalModule: true});
return this.requireModule(from, to, {
isInternalModule: true,
supportsDynamicImport: false,
supportsStaticESM: false,
});
}

requireActual<T = unknown>(from: Config.Path, moduleName: string): T {
Expand Down Expand Up @@ -493,7 +505,7 @@ class Runtime {
}

private _getFullTransformationOptions(
options: InternalModuleOptions | undefined,
options: InternalModuleOptions = defaultTransformOptions,
): TransformationOptions {
return {
...options,
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76 changes: 61 additions & 15 deletions packages/jest-transform/src/ScriptTransformer.ts
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Expand Up @@ -90,6 +90,8 @@ export default class ScriptTransformer {
fileData: string,
filename: Config.Path,
instrument: boolean,
supportsDynamicImport: boolean,
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I made them non-optional for all private methods and default false for the public ones

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should ideally use options objects, as 2-3 boolean flag inputs are quite confusing

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Generally agree, but IIRC functions with more arguments are optimized better than the ones with object arguments, and this is kinda hot path

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potentially we could add separate functions? the es module path can be async (or rather, always is) as well, so that might tie nicely into #9504. Then we could ditch the supportsDynamicImport option since that works for both esm and cjs (and can be async) and just vary on the static version

supportsStaticESM: boolean,
): string {
const configString = this._cache.configString;
const transformer = this._getTransformer(filename);
Expand All @@ -101,8 +103,8 @@ export default class ScriptTransformer {
config: this._config,
instrument,
rootDir: this._config.rootDir,
supportsDynamicImport: false,
supportsStaticESM: false,
supportsDynamicImport,
supportsStaticESM,
}),
)
.update(CACHE_VERSION)
Expand All @@ -122,13 +124,21 @@ export default class ScriptTransformer {
filename: Config.Path,
content: string,
instrument: boolean,
supportsDynamicImport: boolean,
supportsStaticESM: boolean,
): Config.Path {
const baseCacheDir = HasteMap.getCacheFilePath(
this._config.cacheDirectory,
'jest-transform-cache-' + this._config.name,
VERSION,
);
const cacheKey = this._getCacheKey(content, filename, instrument);
const cacheKey = this._getCacheKey(
content,
filename,
instrument,
supportsDynamicImport,
supportsStaticESM,
);
// Create sub folders based on the cacheKey to avoid creating one
// directory with many files.
const cacheDir = path.join(baseCacheDir, cacheKey[0] + cacheKey[1]);
Expand Down Expand Up @@ -193,13 +203,19 @@ export default class ScriptTransformer {
return transform;
}

private _instrumentFile(filename: Config.Path, content: string): string {
private _instrumentFile(
filename: Config.Path,
content: string,
supportsDynamicImport: boolean,
supportsStaticESM: boolean,
): string {
const result = babelTransform(content, {
auxiliaryCommentBefore: ' istanbul ignore next ',
babelrc: false,
caller: {
name: '@jest/transform',
supportsStaticESM: false,
supportsDynamicImport,
supportsStaticESM,
},
configFile: false,
filename,
Expand Down Expand Up @@ -243,14 +259,23 @@ export default class ScriptTransformer {
this._getTransformer(filepath);
}

// TODO: replace third argument with TransformOptions in Jest 26
transformSource(
filepath: Config.Path,
content: string,
instrument: boolean,
supportsDynamicImport = false,
supportsStaticESM = false,
): TransformResult {
const filename = this._getRealPath(filepath);
const transform = this._getTransformer(filename);
const cacheFilePath = this._getFileCachePath(filename, content, instrument);
const cacheFilePath = this._getFileCachePath(
filename,
content,
instrument,
supportsDynamicImport,
supportsStaticESM,
);
let sourceMapPath: Config.Path | null = cacheFilePath + '.map';
// Ignore cache if `config.cache` is set (--no-cache)
let code = this._config.cache ? readCodeCacheFile(cacheFilePath) : null;
Expand Down Expand Up @@ -287,8 +312,8 @@ export default class ScriptTransformer {
if (transform && shouldCallTransform) {
const processed = transform.process(content, filename, this._config, {
instrument,
supportsDynamicImport: false,
supportsStaticESM: false,
supportsDynamicImport,
supportsStaticESM,
});

if (typeof processed === 'string') {
Expand Down Expand Up @@ -323,7 +348,12 @@ export default class ScriptTransformer {
}

if (!transformWillInstrument && instrument) {
code = this._instrumentFile(filename, transformed.code);
code = this._instrumentFile(
filename,
transformed.code,
supportsDynamicImport,
supportsStaticESM,
);
} else {
code = transformed.code;
}
Expand All @@ -350,12 +380,16 @@ export default class ScriptTransformer {

private _transformAndBuildScript(
filename: Config.Path,
options: Options | null,
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seems to have been a bug, it was never passed null 🤷‍♂

options: Options,
instrument: boolean,
fileSource?: string,
): TransformResult {
const isInternalModule = !!(options && options.isInternalModule);
const isCoreModule = !!(options && options.isCoreModule);
const {
isCoreModule,
isInternalModule,
supportsDynamicImport,
supportsStaticESM,
} = options;
const content = stripShebang(
fileSource || fs.readFileSync(filename, 'utf8'),
);
Expand All @@ -375,6 +409,8 @@ export default class ScriptTransformer {
filename,
content,
instrument,
supportsDynamicImport,
supportsStaticESM,
);

code = transformedSource.code;
Expand Down Expand Up @@ -431,8 +467,12 @@ export default class ScriptTransformer {
options: Options,
fileSource: string,
): string {
const isInternalModule = options.isInternalModule;
const isCoreModule = options.isCoreModule;
const {
isCoreModule,
isInternalModule,
supportsDynamicImport,
supportsStaticESM,
} = options;
const willTransform =
!isInternalModule && !isCoreModule && this.shouldTransform(filename);

Expand All @@ -441,6 +481,8 @@ export default class ScriptTransformer {
filename,
fileSource,
false,
supportsDynamicImport,
supportsStaticESM,
);
return transformedJsonSource;
}
Expand Down Expand Up @@ -469,7 +511,11 @@ export default class ScriptTransformer {
(code, filename) => {
try {
transforming = true;
return this.transformSource(filename, code, false).code || code;
return (
// we might wanna do `supportsDynamicImport` at some point
this.transformSource(filename, code, false, false, false).code ||
code
);
} finally {
transforming = false;
}
Expand Down