jhnns/rewire

Health v2 · maintenance only

Adoption not part of the score

3093 stars · 128 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

rewire is a Node.js library that adds special setter and getter methods to CommonJS modules so tests can inject mocks, override private variables, and patch globals. It acts like require() but exposes __set__, __get__, and __with__ for modifying module internals during unit tests.

Use cases

• inject mocks for required modules like fs in unit tests
• inspect and override private variables of a module
• mock globals like process or console within a single module
• revert monkey-patched changes after a test runs
• test node.js modules with hard-to-mock dependencies

When to choose

• you test CommonJS Node.js modules and need to stub their internal dependencies
• you want to access or override module-private variables in tests
• you need scoped global mocking that doesn't leak to other modules

When to avoid

• your project uses ES modules, which rewire does not support
• you prefer dependency injection via constructor parameters or a DI framework
• you want modern alternatives like proxyquire or esm mocking

Facets

library · maturity active

mocking testing testing developer-tools backend monkey-patching dependency-injection unit-testing commonjs nodejs javascript

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