diff --git a/doc/api/assert.md b/doc/api/assert.md index 058aff858be8e5..bcb8479114d960 100644 --- a/doc/api/assert.md +++ b/doc/api/assert.md @@ -7,6 +7,57 @@ The `assert` module provides a simple set of assertion tests that can be used to test invariants. +A `strict` and a `legacy` mode exist, while it is recommended to only use +[`strict mode`][]. + +For more information about the used equality comparisons see +[MDN's guide on equality comparisons and sameness][mdn-equality-guide]. + +## Strict mode + + +When using the `strict mode`, any `assert` function will use the equality used in +the strict function mode. So [`assert.deepEqual()`][] will, for example, work the +same as [`assert.deepStrictEqual()`][]. + +It can be accessed using: + +```js +const assert = require('assert').strict; +``` + +## Legacy mode + +> Stability: 0 - Deprecated: Use strict mode instead. + +When accessing `assert` directly instead of using the `strict` property, the +[Abstract Equality Comparison][] will be used for any function without a +"strict" in its name (e.g. [`assert.deepEqual()`][]). + +It can be accessed using: + +```js +const assert = require('assert'); +``` + +It is recommended to use the [`strict mode`][] instead as the +[Abstract Equality Comparison][] can often have surprising results. Especially +in case of [`assert.deepEqual()`][] as the used comparison rules there are very +lax. + +E.g. + +```js +// WARNING: This does not throw an AssertionError! +assert.deepEqual(/a/gi, new Date()); +``` + ## assert(value[, message])