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feat: pass conditions when resolving modules #11859

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Sep 13, 2021
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10 changes: 7 additions & 3 deletions packages/jest-runtime/src/index.ts
Original file line number Diff line number Diff line change
Expand Up @@ -173,7 +173,7 @@ const supportsNodeColonModulePrefixInImport = (() => {
return stdout === 'true';
})();

// consider "node" condition as well - maybe switching on `global.window` in the test env?
// consider `node` & `browser` condition as well - maybe switching on `global.window` in the test env?
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@nicolo-ribaudo nicolo-ribaudo Sep 10, 2021

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Maybe they could be enabled by jest-environment-* packages? I don't know if the internal architecture makes it impossible, but from my (external, user) point of view it's what makes more sense.

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@SimenB SimenB Sep 10, 2021

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Definitely a possibility! Main worry is browser meaning either ESM or CJS, but I guess we can add the option and just not use it ourselves for now

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I'll open up a separate PR with that after landing this 🙂

const esmConditions = ['import', 'default'];
const cjsConditions = ['require', 'default'];

Expand Down Expand Up @@ -299,8 +299,12 @@ export default class Runtime {
this._virtualMocks,
filePath,
undefined,
// is this correct?
{conditions: cjsConditions},
// shouldn't really matter, but in theory this will make sure the caching is correct
{
conditions: this.unstable_shouldLoadAsEsm(filePath)
? esmConditions
: cjsConditions,
},
);
this._transitiveShouldMock.set(moduleID, false);
}
Expand Down