power-assert-js/power-assert

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

2807 stars · 49 forks observed · 2026-08-28

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

Power Assert is a JavaScript assertion library that provides descriptive assertion failure messages through the standard Node.js assert interface, requiring only a simple `assert(any_expression)` call. It works by transforming test code at build time (via Babel plugins, browserify transforms, webpack loaders, or CLI tools) to instrument expressions and show intermediate values in failure output.

Use cases

• show descriptive assertion failure messages in JavaScript tests
• avoid memorizing many assertion library APIs
• debug failing test expressions with intermediate values
• enhance standard Node.js assert with power-assert output
• use power-assert in browser-side tests
• integrate power-assert with Babel, webpack, browserify, grunt, or gulp

When to choose

• you want rich assertion failure messages without learning a new assertion API
• you prefer writing plain expressions with standard assert over specialized assertion methods
• you want a drop-in enhancement for Node.js assert that is easy to remove later
• you need assertion output in both server-side and browser-side tests

When to avoid

• you cannot or do not want to add a code transpilation step to your test pipeline
• you need a modern, actively developed assertion library with frequent updates
• you prefer assertion libraries with many built-in matchers like Chai or Jest expect
• you work outside the JavaScript/Node.js ecosystem

Facets

library · maturity maintenance

testing developer-tools testing developer-tools browser cross-platform assertion-library power-assert test-assertions descriptive-assertion-messages code-transformation babel-plugin javascript-testing javascript nodejs

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