Feature Request: Module level mocking #51164
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jasonwilliams
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feature request
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When I was searching for a workaround, how to mock imports with the native test runner I found this looking very similar: https://github.com/nodejs/node/blob/main/test/es-module/test-esm-loader-mock.mjs I can't tell if this is already integrated, just missing the new types in @types/node? |
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It's already possible to mock things as the test linked below using the experimental Customization Hook API (https://nodejs.org/api/module.html#customization-hooks). Note that it should work only on Node.js 18.19+/20.6+. Here are the files to set it up, and as you can see, it's only using public APIs: https://github.com/nodejs/node/blob/6a5394ea7dc62b044ed826a7c8d18506ab532b96/test/fixtures/es-module-loaders/mock.mjs |
What is the problem this feature will solve?
Currently you can't mock external or built-in modules which makes it difficult if you code imports a module that may run some side-effects and you have no control over it.
There may be some built in modules which you need to stub out but don't have access to during a test run.
What is the feature you are proposing to solve the problem?
Allowing us to use the built-in test runner to mock modules entirely.
There has already been some work in this by @cjihrig
I think the biggest things missing before I can open a PR are related to ESM loaders and are tracked in #49472 and #49473.
Both of those issues look to be resolved now, I don't know what the current blockers are for this
What alternatives have you considered?
No response
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