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+# assert
+
+[![Build Status](https://travis-ci.org/browserify/commonjs-assert.svg?branch=master)](https://travis-ci.org/browserify/commonjs-assert)
+
+This module is used for writing unit tests for your applications, you can access it with `require('assert')`.
+
+It aims to be fully compatibe with the [node.js assert module](http://nodejs.org/api/assert.html), same API and same behavior, just adding support for web browsers.
+The API and code may contain traces of the [CommonJS Unit Testing 1.0 spec](http://wiki.commonjs.org/wiki/Unit_Testing/1.0) which they were based on, but both have evolved significantly since then.
+
+A `strict` and a `legacy` mode exist, while it is recommended to only use `strict mode`.
+
+## 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
+
+> Deprecated: Use strict mode instead.
+
+When accessing `assert` directly instead of using the `strict` property, the
+[Abstract Equality Comparison](https://tc39.github.io/ecma262/#sec-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.fail(actual, expected, message, operator)
+Throws an exception that displays the values for actual and expected separated by the provided operator.
+
+## assert(value, message), assert.ok(value, [message])
+Tests if value is truthy, it is equivalent to assert.equal(true, !!value, message);
+
+## assert.equal(actual, expected, [message])
+Tests shallow, coercive equality with the equal comparison operator ( == ).
+
+## assert.notEqual(actual, expected, [message])
+Tests shallow, coercive non-equality with the not equal comparison operator ( != ).
+
+## assert.deepEqual(actual, expected, [message])
+Tests for deep equality.
+
+## assert.deepStrictEqual(actual, expected, [message])
+Tests for deep equality, as determined by the strict equality operator ( === )
+
+## assert.notDeepEqual(actual, expected, [message])
+Tests for any deep inequality.
+
+## assert.strictEqual(actual, expected, [message])
+Tests strict equality, as determined by the strict equality operator ( === )
+
+## assert.notStrictEqual(actual, expected, [message])
+Tests strict non-equality, as determined by the strict not equal operator ( !== )
+
+## assert.throws(block, [error], [message])
+Expects block to throw an error. error can be constructor, regexp or validation function.
+
+Validate instanceof using constructor:
+
+```javascript
+assert.throws(function() { throw new Error("Wrong value"); }, Error);
+```
+
+Validate error message using RegExp:
+
+```javascript
+assert.throws(function() { throw new Error("Wrong value"); }, /value/);
+```
+
+Custom error validation:
+
+```javascript
+assert.throws(function() {
+    throw new Error("Wrong value");
+}, function(err) {
+    if ( (err instanceof Error) && /value/.test(err) ) {
+        return true;
+    }
+}, "unexpected error");
+```
+
+## assert.doesNotThrow(block, [message])
+Expects block not to throw an error, see assert.throws for details.
+
+## assert.ifError(value)
+Tests if value is not a false value, throws if it is a true value. Useful when testing the first argument, error in callbacks.