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Interpose.js is an open-source JavaScript library for intercepting and wrapping function calls. It is aimed at developers who need to add cross-cutting behavior such as logging, authorization, metrics, or argument transformation without changing the original functions.
💡 Pick it when you want dependency-free, language-level interception with broad object and function coverage.
Proxy is a software pattern that controls access to another object, acting as a surrogate or placeholder.
💡 Pick it when interception is mainly for tests and you also need mature spies, stubs, mocks, and fake timers.
Standalone test spies, stubs and mocks for JavaScript.
Thorsten Lorenz and contributors
💡 Pick it when your main need is replacing Node.js CommonJS dependencies during isolated tests.
Proxyquire is a Node.js testing library for replacing dependencies loaded through CommonJS require calls. It is aimed at developers testing modules in...
testdouble.js contributors
💡 Pick it for a focused, readable test-double API instead of production-oriented function interception.
testdouble.js is a JavaScript test-double library for creating stubs, spies, and verification-based mocks. It is intended for developers who want expressive test...
Kasper Peeters and contributors
💡 Pick it when you need module-level mocking across CommonJS, ES modules, or bundler-based test setups.
Rewiremock is a JavaScript module-mocking library that replaces dependencies at load time. It targets Node.js and bundler-based projects that need flexible mocking...
AspectJS contributors
💡 Pick it when you need typed, class-oriented AOP across a larger TypeScript application.
AspectJS is a TypeScript aspect-oriented programming framework for applying reusable advice to classes and methods. It is aimed at TypeScript teams that...
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