lts/doc/api/assert.json
{
"type": "module",
"source": "doc/api/assert.md",
"modules": [
{
"textRaw": "Assert",
"name": "assert",
"introduced_in": "v0.1.21",
"stability": 2,
"stabilityText": "Stable",
"desc": "<p>The <code>assert</code> module provides a set of assertion functions for verifying\ninvariants.</p>",
"modules": [
{
"textRaw": "Strict assertion mode",
"name": "strict_assertion_mode",
"meta": {
"added": [
"v9.9.0"
],
"changes": [
{
"version": "v12.16.2",
"description": "Changed \"strict mode\" to \"strict assertion mode\" and \"legacy mode\" to \"legacy assertion mode\" to avoid confusion with the more usual meaining of \"strict mode\"."
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"desc": "<p>In strict assertion mode, non-strict methods behave like their corresponding\nstrict methods. For example, <a href=\"#assert_assert_deepequal_actual_expected_message\"><code>assert.deepEqual()</code></a> will behave like\n<a href=\"#assert_assert_deepstrictequal_actual_expected_message\"><code>assert.deepStrictEqual()</code></a>.</p>\n<p>In strict assertion mode, error messages for objects display a diff. In legacy\nassertion mode, error messages for objects display the objects, often truncated.</p>\n<p>To use strict assertion mode:</p>\n<pre><code class=\"language-js\">const assert = require('assert').strict;\n</code></pre>\n<p>Example error diff:</p>\n<pre><code class=\"language-js\">const assert = require('assert').strict;\n\nassert.deepEqual([[[1, 2, 3]], 4, 5], [[[1, 2, '3']], 4, 5]);\n// AssertionError: Expected inputs to be strictly deep-equal:\n// + actual - expected ... Lines skipped\n//\n// [\n// [\n// ...\n// 2,\n// + 3\n// - '3'\n// ],\n// ...\n// 5\n// ]\n</code></pre>\n<p>To deactivate the colors, use the <code>NO_COLOR</code> or <code>NODE_DISABLE_COLORS</code>\nenvironment variables. This will also deactivate the colors in the REPL. For\nmore on color support in terminal environments, read the tty\n<a href=\"tty.html#tty_writestream_getcolordepth_env\">getColorDepth()</a> documentation.</p>",
"type": "module",
"displayName": "Strict assertion mode"
},
{
"textRaw": "Legacy assertion mode",
"name": "legacy_assertion_mode",
"desc": "<p>Legacy assertion mode uses the <a href=\"https://tc39.github.io/ecma262/#sec-abstract-equality-comparison\">Abstract Equality Comparison</a> in:</p>\n<ul>\n<li><a href=\"#assert_assert_deepequal_actual_expected_message\"><code>assert.deepEqual()</code></a></li>\n<li><a href=\"#assert_assert_equal_actual_expected_message\"><code>assert.equal()</code></a></li>\n<li><a href=\"#assert_assert_notdeepequal_actual_expected_message\"><code>assert.notDeepEqual()</code></a></li>\n<li><a href=\"#assert_assert_notequal_actual_expected_message\"><code>assert.notEqual()</code></a></li>\n</ul>\n<p>To use legacy assertion mode:</p>\n<pre><code class=\"language-js\">const assert = require('assert');\n</code></pre>\n<p>Whenever possible, use the <a href=\"#assert_strict_assertion_mode\">strict assertion mode</a> instead. Otherwise, the\n<a href=\"https://tc39.github.io/ecma262/#sec-abstract-equality-comparison\">Abstract Equality Comparison</a> may cause surprising results. This is\nespecially true for <a href=\"#assert_assert_deepequal_actual_expected_message\"><code>assert.deepEqual()</code></a>, where the comparison rules are\nlax:</p>\n<pre><code class=\"language-js\">// WARNING: This does not throw an AssertionError!\nassert.deepEqual(/a/gi, new Date());\n</code></pre>",
"type": "module",
"displayName": "Legacy assertion mode"
}
],
"classes": [
{
"textRaw": "Class: assert.AssertionError",
"type": "class",
"name": "assert.AssertionError",
"desc": "<ul>\n<li>Extends: <a href=\"errors.html#errors_class_error\" class=\"type\"><errors.Error></a></li>\n</ul>\n<p>Indicates the failure of an assertion. All errors thrown by the <code>assert</code> module\nwill be instances of the <code>AssertionError</code> class.</p>",
"signatures": [
{
"params": [
{
"textRaw": "`options` {Object}",
"name": "options",
"type": "Object",
"options": [
{
"textRaw": "`message` {string} If provided, the error message is set to this value.",
"name": "message",
"type": "string",
"desc": "If provided, the error message is set to this value."
},
{
"textRaw": "`actual` {any} The `actual` property on the error instance.",
"name": "actual",
"type": "any",
"desc": "The `actual` property on the error instance."
},
{
"textRaw": "`expected` {any} The `expected` property on the error instance.",
"name": "expected",
"type": "any",
"desc": "The `expected` property on the error instance."
},
{
"textRaw": "`operator` {string} The `operator` property on the error instance.",
"name": "operator",
"type": "string",
"desc": "The `operator` property on the error instance."
},
{
"textRaw": "`stackStartFn` {Function} If provided, the generated stack trace omits frames before this function.",
"name": "stackStartFn",
"type": "Function",
"desc": "If provided, the generated stack trace omits frames before this function."
}
]
}
],
"desc": "<p>A subclass of <code>Error</code> that indicates the failure of an assertion.</p>\n<p>All instances contain the built-in <code>Error</code> properties (<code>message</code> and <code>name</code>)\nand:</p>\n<ul>\n<li><code>actual</code> <a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types\" class=\"type\"><any></a> Set to the <code>actual</code> argument for methods such as\n<a href=\"#assert_assert_strictequal_actual_expected_message\"><code>assert.strictEqual()</code></a>.</li>\n<li><code>expected</code> <a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types\" class=\"type\"><any></a> Set to the <code>expected</code> value for methods such as\n<a href=\"#assert_assert_strictequal_actual_expected_message\"><code>assert.strictEqual()</code></a>.</li>\n<li><code>generatedMessage</code> <a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type\" class=\"type\"><boolean></a> Indicates if the message was auto-generated\n(<code>true</code>) or not.</li>\n<li><code>code</code> <a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type\" class=\"type\"><string></a> Value is always <code>ERR_ASSERTION</code> to show that the error is an\nassertion error.</li>\n<li><code>operator</code> <a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type\" class=\"type\"><string></a> Set to the passed in operator value.</li>\n</ul>\n<pre><code class=\"language-js\">const assert = require('assert');\n\n// Generate an AssertionError to compare the error message later:\nconst { message } = new assert.AssertionError({\n actual: 1,\n expected: 2,\n operator: 'strictEqual'\n});\n\n// Verify error output:\ntry {\n assert.strictEqual(1, 2);\n} catch (err) {\n assert(err instanceof assert.AssertionError);\n assert.strictEqual(err.message, message);\n assert.strictEqual(err.name, 'AssertionError');\n assert.strictEqual(err.actual, 1);\n assert.strictEqual(err.expected, 2);\n assert.strictEqual(err.code, 'ERR_ASSERTION');\n assert.strictEqual(err.operator, 'strictEqual');\n assert.strictEqual(err.generatedMessage, true);\n}\n</code></pre>"
}
]
}
],
"methods": [
{
"textRaw": "`assert(value[, message])`",
"type": "method",
"name": "assert",
"meta": {
"added": [
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"changes": []
},
"signatures": [
{
"params": [
{
"textRaw": "`value` {any} The input that is checked for being truthy.",
"name": "value",
"type": "any",
"desc": "The input that is checked for being truthy."
},
{
"textRaw": "`message` {string|Error}",
"name": "message",
"type": "string|Error"
}
]
}
],
"desc": "<p>An alias of <a href=\"#assert_assert_ok_value_message\"><code>assert.ok()</code></a>.</p>"
},
{
"textRaw": "`assert.deepEqual(actual, expected[, message])`",
"type": "method",
"name": "deepEqual",
"meta": {
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"changes": [
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"description": "The type tags are now properly compared and there are a couple minor comparison adjustments to make the check less surprising."
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"description": "The `Set` and `Map` content is also compared"
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"pr-url": "https://github.com/nodejs/node/pull/8002",
"description": "Typed array slices are handled correctly now."
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"description": "Objects with circular references can be used as inputs now."
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"signatures": [
{
"params": [
{
"textRaw": "`actual` {any}",
"name": "actual",
"type": "any"
},
{
"textRaw": "`expected` {any}",
"name": "expected",
"type": "any"
},
{
"textRaw": "`message` {string|Error}",
"name": "message",
"type": "string|Error"
}
]
}
],
"desc": "<p><strong>Strict assertion mode</strong></p>\n<p>An alias of <a href=\"#assert_assert_deepstrictequal_actual_expected_message\"><code>assert.deepStrictEqual()</code></a>.</p>\n<p><strong>Legacy assertion mode</strong></p>\n<blockquote>\n<p>Stability: 0 - Deprecated: Use <a href=\"#assert_assert_deepstrictequal_actual_expected_message\"><code>assert.deepStrictEqual()</code></a> instead.</p>\n</blockquote>\n<p>Tests for deep equality between the <code>actual</code> and <code>expected</code> parameters. Consider\nusing <a href=\"#assert_assert_deepstrictequal_actual_expected_message\"><code>assert.deepStrictEqual()</code></a> instead. <a href=\"#assert_assert_deepequal_actual_expected_message\"><code>assert.deepEqual()</code></a> can have\nsurprising results.</p>\n<p><em>Deep equality</em> means that the enumerable \"own\" properties of child objects\nare also recursively evaluated by the following rules.</p>",
"modules": [
{
"textRaw": "Comparison details",
"name": "comparison_details",
"desc": "<ul>\n<li>Primitive values are compared with the <a href=\"https://tc39.github.io/ecma262/#sec-abstract-equality-comparison\">Abstract Equality Comparison</a>\n( <code>==</code> ).</li>\n<li><a href=\"https://tc39.github.io/ecma262/#sec-object.prototype.tostring\">Type tags</a> of objects should be the same.</li>\n<li>Only <a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Enumerability_and_ownership_of_properties\">enumerable \"own\" properties</a> are considered.</li>\n<li><a href=\"errors.html#errors_class_error\"><code>Error</code></a> names and messages are always compared, even if these are not\nenumerable properties.</li>\n<li><a href=\"https://developer.mozilla.org/en-US/docs/Glossary/Primitive#Primitive_wrapper_objects_in_JavaScript\">Object wrappers</a> are compared both as objects and unwrapped values.</li>\n<li><code>Object</code> properties are compared unordered.</li>\n<li><a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map\"><code>Map</code></a> keys and <a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set\"><code>Set</code></a> items are compared unordered.</li>\n<li>Recursion stops when both sides differ or both sides encounter a circular\nreference.</li>\n<li>Implementation does not test the <a href=\"https://tc39.github.io/ecma262/#sec-ordinary-object-internal-methods-and-internal-slots\"><code>[[Prototype]]</code></a> of\nobjects.</li>\n<li><a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol\"><code>Symbol</code></a> properties are not compared.</li>\n<li><a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap\"><code>WeakMap</code></a> and <a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakSet\"><code>WeakSet</code></a> comparison does not rely on their values.</li>\n</ul>\n<p>The following example does not throw an <a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a> because the\nprimitives are considered equal by the <a href=\"https://tc39.github.io/ecma262/#sec-abstract-equality-comparison\">Abstract Equality Comparison</a>\n( <code>==</code> ).</p>\n<pre><code class=\"language-js\">// WARNING: This does not throw an AssertionError!\nassert.deepEqual('+00000000', false);\n</code></pre>\n<p>\"Deep\" equality means that the enumerable \"own\" properties of child objects\nare evaluated also:</p>\n<pre><code class=\"language-js\">const assert = require('assert');\n\nconst obj1 = {\n a: {\n b: 1\n }\n};\nconst obj2 = {\n a: {\n b: 2\n }\n};\nconst obj3 = {\n a: {\n b: 1\n }\n};\nconst obj4 = Object.create(obj1);\n\nassert.deepEqual(obj1, obj1);\n// OK\n\n// Values of b are different:\nassert.deepEqual(obj1, obj2);\n// AssertionError: { a: { b: 1 } } deepEqual { a: { b: 2 } }\n\nassert.deepEqual(obj1, obj3);\n// OK\n\n// Prototypes are ignored:\nassert.deepEqual(obj1, obj4);\n// AssertionError: { a: { b: 1 } } deepEqual {}\n</code></pre>\n<p>If the values are not equal, an <a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a> is thrown with a <code>message</code>\nproperty set equal to the value of the <code>message</code> parameter. If the <code>message</code>\nparameter is undefined, a default error message is assigned. If the <code>message</code>\nparameter is an instance of an <a href=\"errors.html#errors_class_error\"><code>Error</code></a> then it will be thrown instead of the\n<a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a>.</p>",
"type": "module",
"displayName": "Comparison details"
}
]
},
{
"textRaw": "`assert.deepStrictEqual(actual, expected[, message])`",
"type": "method",
"name": "deepStrictEqual",
"meta": {
"added": [
"v1.2.0"
],
"changes": [
{
"version": "v9.0.0",
"pr-url": "https://github.com/nodejs/node/pull/15169",
"description": "Enumerable symbol properties are now compared."
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{
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"pr-url": "https://github.com/nodejs/node/pull/15036",
"description": "The `NaN` is now compared using the [SameValueZero](https://tc39.github.io/ecma262/#sec-samevaluezero) comparison."
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"description": "The `Error` names and messages are now properly compared"
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"pr-url": "https://github.com/nodejs/node/pull/12142",
"description": "The `Set` and `Map` content is also compared"
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{
"version": "v6.4.0, v4.7.1",
"pr-url": "https://github.com/nodejs/node/pull/8002",
"description": "Typed array slices are handled correctly now."
},
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"version": "v6.1.0",
"pr-url": "https://github.com/nodejs/node/pull/6432",
"description": "Objects with circular references can be used as inputs now."
},
{
"version": "v5.10.1, v4.4.3",
"pr-url": "https://github.com/nodejs/node/pull/5910",
"description": "Handle non-`Uint8Array` typed arrays correctly."
}
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},
"signatures": [
{
"params": [
{
"textRaw": "`actual` {any}",
"name": "actual",
"type": "any"
},
{
"textRaw": "`expected` {any}",
"name": "expected",
"type": "any"
},
{
"textRaw": "`message` {string|Error}",
"name": "message",
"type": "string|Error"
}
]
}
],
"desc": "<p>Tests for deep equality between the <code>actual</code> and <code>expected</code> parameters.\n\"Deep\" equality means that the enumerable \"own\" properties of child objects\nare recursively evaluated also by the following rules.</p>",
"modules": [
{
"textRaw": "Comparison details",
"name": "comparison_details",
"desc": "<ul>\n<li>Primitive values are compared using the <a href=\"https://tc39.github.io/ecma262/#sec-samevalue\">SameValue Comparison</a>, used by\n<a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is\"><code>Object.is()</code></a>.</li>\n<li><a href=\"https://tc39.github.io/ecma262/#sec-object.prototype.tostring\">Type tags</a> of objects should be the same.</li>\n<li><a href=\"https://tc39.github.io/ecma262/#sec-ordinary-object-internal-methods-and-internal-slots\"><code>[[Prototype]]</code></a> of objects are compared using\nthe <a href=\"https://tc39.github.io/ecma262/#sec-strict-equality-comparison\">Strict Equality Comparison</a>.</li>\n<li>Only <a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Enumerability_and_ownership_of_properties\">enumerable \"own\" properties</a> are considered.</li>\n<li><a href=\"errors.html#errors_class_error\"><code>Error</code></a> names and messages are always compared, even if these are not\nenumerable properties.</li>\n<li>Enumerable own <a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol\"><code>Symbol</code></a> properties are compared as well.</li>\n<li><a href=\"https://developer.mozilla.org/en-US/docs/Glossary/Primitive#Primitive_wrapper_objects_in_JavaScript\">Object wrappers</a> are compared both as objects and unwrapped values.</li>\n<li><code>Object</code> properties are compared unordered.</li>\n<li><a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map\"><code>Map</code></a> keys and <a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set\"><code>Set</code></a> items are compared unordered.</li>\n<li>Recursion stops when both sides differ or both sides encounter a circular\nreference.</li>\n<li><a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap\"><code>WeakMap</code></a> and <a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakSet\"><code>WeakSet</code></a> comparison does not rely on their values. See\nbelow for further details.</li>\n</ul>\n<pre><code class=\"language-js\">const assert = require('assert').strict;\n\n// This fails because 1 !== '1'.\nassert.deepStrictEqual({ a: 1 }, { a: '1' });\n// AssertionError: Expected inputs to be strictly deep-equal:\n// + actual - expected\n//\n// {\n// + a: 1\n// - a: '1'\n// }\n\n// The following objects don't have own properties\nconst date = new Date();\nconst object = {};\nconst fakeDate = {};\nObject.setPrototypeOf(fakeDate, Date.prototype);\n\n// Different [[Prototype]]:\nassert.deepStrictEqual(object, fakeDate);\n// AssertionError: Expected inputs to be strictly deep-equal:\n// + actual - expected\n//\n// + {}\n// - Date {}\n\n// Different type tags:\nassert.deepStrictEqual(date, fakeDate);\n// AssertionError: Expected inputs to be strictly deep-equal:\n// + actual - expected\n//\n// + 2018-04-26T00:49:08.604Z\n// - Date {}\n\nassert.deepStrictEqual(NaN, NaN);\n// OK, because of the SameValue comparison\n\n// Different unwrapped numbers:\nassert.deepStrictEqual(new Number(1), new Number(2));\n// AssertionError: Expected inputs to be strictly deep-equal:\n// + actual - expected\n//\n// + [Number: 1]\n// - [Number: 2]\n\nassert.deepStrictEqual(new String('foo'), Object('foo'));\n// OK because the object and the string are identical when unwrapped.\n\nassert.deepStrictEqual(-0, -0);\n// OK\n\n// Different zeros using the SameValue Comparison:\nassert.deepStrictEqual(0, -0);\n// AssertionError: Expected inputs to be strictly deep-equal:\n// + actual - expected\n//\n// + 0\n// - -0\n\nconst symbol1 = Symbol();\nconst symbol2 = Symbol();\nassert.deepStrictEqual({ [symbol1]: 1 }, { [symbol1]: 1 });\n// OK, because it is the same symbol on both objects.\n\nassert.deepStrictEqual({ [symbol1]: 1 }, { [symbol2]: 1 });\n// AssertionError [ERR_ASSERTION]: Inputs identical but not reference equal:\n//\n// {\n// [Symbol()]: 1\n// }\n\nconst weakMap1 = new WeakMap();\nconst weakMap2 = new WeakMap([[{}, {}]]);\nconst weakMap3 = new WeakMap();\nweakMap3.unequal = true;\n\nassert.deepStrictEqual(weakMap1, weakMap2);\n// OK, because it is impossible to compare the entries\n\n// Fails because weakMap3 has a property that weakMap1 does not contain:\nassert.deepStrictEqual(weakMap1, weakMap3);\n// AssertionError: Expected inputs to be strictly deep-equal:\n// + actual - expected\n//\n// WeakMap {\n// + [items unknown]\n// - [items unknown],\n// - unequal: true\n// }\n</code></pre>\n<p>If the values are not equal, an <a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a> is thrown with a <code>message</code>\nproperty set equal to the value of the <code>message</code> parameter. If the <code>message</code>\nparameter is undefined, a default error message is assigned. If the <code>message</code>\nparameter is an instance of an <a href=\"errors.html#errors_class_error\"><code>Error</code></a> then it will be thrown instead of the\n<code>AssertionError</code>.</p>",
"type": "module",
"displayName": "Comparison details"
}
]
},
{
"textRaw": "`assert.doesNotMatch(string, regexp[, message])`",
"type": "method",
"name": "doesNotMatch",
"meta": {
"added": [
"v12.16.0"
],
"changes": []
},
"stability": 1,
"stabilityText": "Experimental",
"signatures": [
{
"params": [
{
"textRaw": "`string` {string}",
"name": "string",
"type": "string"
},
{
"textRaw": "`regexp` {RegExp}",
"name": "regexp",
"type": "RegExp"
},
{
"textRaw": "`message` {string|Error}",
"name": "message",
"type": "string|Error"
}
]
}
],
"desc": "<p>Expects the <code>string</code> input not to match the regular expression.</p>\n<p>This feature is currently experimental and the name might change or it might be\ncompletely removed again.</p>\n<pre><code class=\"language-js\">const assert = require('assert').strict;\n\nassert.doesNotMatch('I will fail', /fail/);\n// AssertionError [ERR_ASSERTION]: The input was expected to not match the ...\n\nassert.doesNotMatch(123, /pass/);\n// AssertionError [ERR_ASSERTION]: The \"string\" argument must be of type string.\n\nassert.doesNotMatch('I will pass', /different/);\n// OK\n</code></pre>\n<p>If the values do match, or if the <code>string</code> argument is of another type than\n<code>string</code>, an <a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a> is thrown with a <code>message</code> property set equal\nto the value of the <code>message</code> parameter. If the <code>message</code> parameter is\nundefined, a default error message is assigned. If the <code>message</code> parameter is an\ninstance of an <a href=\"errors.html#errors_class_error\"><code>Error</code></a> then it will be thrown instead of the\n<a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a>.</p>"
},
{
"textRaw": "`assert.doesNotReject(asyncFn[, error][, message])`",
"type": "method",
"name": "doesNotReject",
"meta": {
"added": [
"v10.0.0"
],
"changes": []
},
"signatures": [
{
"params": [
{
"textRaw": "`asyncFn` {Function|Promise}",
"name": "asyncFn",
"type": "Function|Promise"
},
{
"textRaw": "`error` {RegExp|Function}",
"name": "error",
"type": "RegExp|Function"
},
{
"textRaw": "`message` {string}",
"name": "message",
"type": "string"
}
]
}
],
"desc": "<p>Awaits the <code>asyncFn</code> promise or, if <code>asyncFn</code> is a function, immediately\ncalls the function and awaits the returned promise to complete. It will then\ncheck that the promise is not rejected.</p>\n<p>If <code>asyncFn</code> is a function and it throws an error synchronously,\n<code>assert.doesNotReject()</code> will return a rejected <code>Promise</code> with that error. If\nthe function does not return a promise, <code>assert.doesNotReject()</code> will return a\nrejected <code>Promise</code> with an <a href=\"errors.html#errors_err_invalid_return_value\"><code>ERR_INVALID_RETURN_VALUE</code></a> error. In both cases\nthe error handler is skipped.</p>\n<p>Using <code>assert.doesNotReject()</code> is actually not useful because there is little\nbenefit in catching a rejection and then rejecting it again. Instead, consider\nadding a comment next to the specific code path that should not reject and keep\nerror messages as expressive as possible.</p>\n<p>If specified, <code>error</code> can be a <a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes\"><code>Class</code></a>, <a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions\"><code>RegExp</code></a> or a validation\nfunction. See <a href=\"#assert_assert_throws_fn_error_message\"><code>assert.throws()</code></a> for more details.</p>\n<p>Besides the async nature to await the completion behaves identically to\n<a href=\"#assert_assert_doesnotthrow_fn_error_message\"><code>assert.doesNotThrow()</code></a>.</p>\n<!-- eslint-disable no-restricted-syntax -->\n<pre><code class=\"language-js\">(async () => {\n await assert.doesNotReject(\n async () => {\n throw new TypeError('Wrong value');\n },\n SyntaxError\n );\n})();\n</code></pre>\n<!-- eslint-disable no-restricted-syntax -->\n<pre><code class=\"language-js\">assert.doesNotReject(Promise.reject(new TypeError('Wrong value')))\n .then(() => {\n // ...\n });\n</code></pre>"
},
{
"textRaw": "`assert.doesNotThrow(fn[, error][, message])`",
"type": "method",
"name": "doesNotThrow",
"meta": {
"added": [
"v0.1.21"
],
"changes": [
{
"version": "v5.11.0, v4.4.5",
"pr-url": "https://github.com/nodejs/node/pull/2407",
"description": "The `message` parameter is respected now."
},
{
"version": "v4.2.0",
"pr-url": "https://github.com/nodejs/node/pull/3276",
"description": "The `error` parameter can now be an arrow function."
}
]
},
"signatures": [
{
"params": [
{
"textRaw": "`fn` {Function}",
"name": "fn",
"type": "Function"
},
{
"textRaw": "`error` {RegExp|Function}",
"name": "error",
"type": "RegExp|Function"
},
{
"textRaw": "`message` {string}",
"name": "message",
"type": "string"
}
]
}
],
"desc": "<p>Asserts that the function <code>fn</code> does not throw an error.</p>\n<p>Using <code>assert.doesNotThrow()</code> is actually not useful because there\nis no benefit in catching an error and then rethrowing it. Instead, consider\nadding a comment next to the specific code path that should not throw and keep\nerror messages as expressive as possible.</p>\n<p>When <code>assert.doesNotThrow()</code> is called, it will immediately call the <code>fn</code>\nfunction.</p>\n<p>If an error is thrown and it is the same type as that specified by the <code>error</code>\nparameter, then an <a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a> is thrown. If the error is of a\ndifferent type, or if the <code>error</code> parameter is undefined, the error is\npropagated back to the caller.</p>\n<p>If specified, <code>error</code> can be a <a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes\"><code>Class</code></a>, <a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions\"><code>RegExp</code></a> or a validation\nfunction. See <a href=\"#assert_assert_throws_fn_error_message\"><code>assert.throws()</code></a> for more details.</p>\n<p>The following, for instance, will throw the <a href=\"errors.html#errors_class_typeerror\"><code>TypeError</code></a> because there is no\nmatching error type in the assertion:</p>\n<!-- eslint-disable no-restricted-syntax -->\n<pre><code class=\"language-js\">assert.doesNotThrow(\n () => {\n throw new TypeError('Wrong value');\n },\n SyntaxError\n);\n</code></pre>\n<p>However, the following will result in an <a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a> with the message\n'Got unwanted exception...':</p>\n<!-- eslint-disable no-restricted-syntax -->\n<pre><code class=\"language-js\">assert.doesNotThrow(\n () => {\n throw new TypeError('Wrong value');\n },\n TypeError\n);\n</code></pre>\n<p>If an <a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a> is thrown and a value is provided for the <code>message</code>\nparameter, the value of <code>message</code> will be appended to the <a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a>\nmessage:</p>\n<!-- eslint-disable no-restricted-syntax -->\n<pre><code class=\"language-js\">assert.doesNotThrow(\n () => {\n throw new TypeError('Wrong value');\n },\n /Wrong value/,\n 'Whoops'\n);\n// Throws: AssertionError: Got unwanted exception: Whoops\n</code></pre>"
},
{
"textRaw": "`assert.equal(actual, expected[, message])`",
"type": "method",
"name": "equal",
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"added": [
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],
"changes": []
},
"signatures": [
{
"params": [
{
"textRaw": "`actual` {any}",
"name": "actual",
"type": "any"
},
{
"textRaw": "`expected` {any}",
"name": "expected",
"type": "any"
},
{
"textRaw": "`message` {string|Error}",
"name": "message",
"type": "string|Error"
}
]
}
],
"desc": "<p><strong>Strict assertion mode</strong></p>\n<p>An alias of <a href=\"#assert_assert_strictequal_actual_expected_message\"><code>assert.strictEqual()</code></a>.</p>\n<p><strong>Legacy assertion mode</strong></p>\n<blockquote>\n<p>Stability: 0 - Deprecated: Use <a href=\"#assert_assert_strictequal_actual_expected_message\"><code>assert.strictEqual()</code></a> instead.</p>\n</blockquote>\n<p>Tests shallow, coercive equality between the <code>actual</code> and <code>expected</code> parameters\nusing the <a href=\"https://tc39.github.io/ecma262/#sec-abstract-equality-comparison\">Abstract Equality Comparison</a> ( <code>==</code> ).</p>\n<pre><code class=\"language-js\">const assert = require('assert');\n\nassert.equal(1, 1);\n// OK, 1 == 1\nassert.equal(1, '1');\n// OK, 1 == '1'\n\nassert.equal(1, 2);\n// AssertionError: 1 == 2\nassert.equal({ a: { b: 1 } }, { a: { b: 1 } });\n// AssertionError: { a: { b: 1 } } == { a: { b: 1 } }\n</code></pre>\n<p>If the values are not equal, an <a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a> is thrown with a <code>message</code>\nproperty set equal to the value of the <code>message</code> parameter. If the <code>message</code>\nparameter is undefined, a default error message is assigned. If the <code>message</code>\nparameter is an instance of an <a href=\"errors.html#errors_class_error\"><code>Error</code></a> then it will be thrown instead of the\n<code>AssertionError</code>.</p>"
},
{
"textRaw": "`assert.fail([message])`",
"type": "method",
"name": "fail",
"meta": {
"added": [
"v0.1.21"
],
"changes": []
},
"signatures": [
{
"params": [
{
"textRaw": "`message` {string|Error} **Default:** `'Failed'`",
"name": "message",
"type": "string|Error",
"default": "`'Failed'`"
}
]
}
],
"desc": "<p>Throws an <a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a> with the provided error message or a default\nerror message. If the <code>message</code> parameter is an instance of an <a href=\"errors.html#errors_class_error\"><code>Error</code></a> then\nit will be thrown instead of the <a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a>.</p>\n<pre><code class=\"language-js\">const assert = require('assert').strict;\n\nassert.fail();\n// AssertionError [ERR_ASSERTION]: Failed\n\nassert.fail('boom');\n// AssertionError [ERR_ASSERTION]: boom\n\nassert.fail(new TypeError('need array'));\n// TypeError: need array\n</code></pre>\n<p>Using <code>assert.fail()</code> with more than two arguments is possible but deprecated.\nSee below for further details.</p>"
},
{
"textRaw": "`assert.fail(actual, expected[, message[, operator[, stackStartFn]]])`",
"type": "method",
"name": "fail",
"meta": {
"added": [
"v0.1.21"
],
"changes": [
{
"version": "v10.0.0",
"pr-url": "https://github.com/nodejs/node/pull/18418",
"description": "Calling `assert.fail()` with more than one argument is deprecated and emits a warning."
}
]
},
"stability": 0,
"stabilityText": "Deprecated: Use `assert.fail([message])` or other assert\nfunctions instead.",
"signatures": [
{
"params": [
{
"textRaw": "`actual` {any}",
"name": "actual",
"type": "any"
},
{
"textRaw": "`expected` {any}",
"name": "expected",
"type": "any"
},
{
"textRaw": "`message` {string|Error}",
"name": "message",
"type": "string|Error"
},
{
"textRaw": "`operator` {string} **Default:** `'!='`",
"name": "operator",
"type": "string",
"default": "`'!='`"
},
{
"textRaw": "`stackStartFn` {Function} **Default:** `assert.fail`",
"name": "stackStartFn",
"type": "Function",
"default": "`assert.fail`"
}
]
}
],
"desc": "<p>If <code>message</code> is falsy, the error message is set as the values of <code>actual</code> and\n<code>expected</code> separated by the provided <code>operator</code>. If just the two <code>actual</code> and\n<code>expected</code> arguments are provided, <code>operator</code> will default to <code>'!='</code>. If\n<code>message</code> is provided as third argument it will be used as the error message and\nthe other arguments will be stored as properties on the thrown object. If\n<code>stackStartFn</code> is provided, all stack frames above that function will be\nremoved from stacktrace (see <a href=\"errors.html#errors_error_capturestacktrace_targetobject_constructoropt\"><code>Error.captureStackTrace</code></a>). If no arguments are\ngiven, the default message <code>Failed</code> will be used.</p>\n<pre><code class=\"language-js\">const assert = require('assert').strict;\n\nassert.fail('a', 'b');\n// AssertionError [ERR_ASSERTION]: 'a' != 'b'\n\nassert.fail(1, 2, undefined, '>');\n// AssertionError [ERR_ASSERTION]: 1 > 2\n\nassert.fail(1, 2, 'fail');\n// AssertionError [ERR_ASSERTION]: fail\n\nassert.fail(1, 2, 'whoops', '>');\n// AssertionError [ERR_ASSERTION]: whoops\n\nassert.fail(1, 2, new TypeError('need array'));\n// TypeError: need array\n</code></pre>\n<p>In the last three cases <code>actual</code>, <code>expected</code>, and <code>operator</code> have no\ninfluence on the error message.</p>\n<p>Example use of <code>stackStartFn</code> for truncating the exception's stacktrace:</p>\n<pre><code class=\"language-js\">function suppressFrame() {\n assert.fail('a', 'b', undefined, '!==', suppressFrame);\n}\nsuppressFrame();\n// AssertionError [ERR_ASSERTION]: 'a' !== 'b'\n// at repl:1:1\n// at ContextifyScript.Script.runInThisContext (vm.js:44:33)\n// ...\n</code></pre>"
},
{
"textRaw": "`assert.ifError(value)`",
"type": "method",
"name": "ifError",
"meta": {
"added": [
"v0.1.97"
],
"changes": [
{
"version": "v10.0.0",
"pr-url": "https://github.com/nodejs/node/pull/18247",
"description": "Instead of throwing the original error it is now wrapped into an [`AssertionError`][] that contains the full stack trace."
},
{
"version": "v10.0.0",
"pr-url": "https://github.com/nodejs/node/pull/18247",
"description": "Value may now only be `undefined` or `null`. Before all falsy values were handled the same as `null` and did not throw."
}
]
},
"signatures": [
{
"params": [
{
"textRaw": "`value` {any}",
"name": "value",
"type": "any"
}
]
}
],
"desc": "<p>Throws <code>value</code> if <code>value</code> is not <code>undefined</code> or <code>null</code>. This is useful when\ntesting the <code>error</code> argument in callbacks. The stack trace contains all frames\nfrom the error passed to <code>ifError()</code> including the potential new frames for\n<code>ifError()</code> itself.</p>\n<pre><code class=\"language-js\">const assert = require('assert').strict;\n\nassert.ifError(null);\n// OK\nassert.ifError(0);\n// AssertionError [ERR_ASSERTION]: ifError got unwanted exception: 0\nassert.ifError('error');\n// AssertionError [ERR_ASSERTION]: ifError got unwanted exception: 'error'\nassert.ifError(new Error());\n// AssertionError [ERR_ASSERTION]: ifError got unwanted exception: Error\n\n// Create some random error frames.\nlet err;\n(function errorFrame() {\n err = new Error('test error');\n})();\n\n(function ifErrorFrame() {\n assert.ifError(err);\n})();\n// AssertionError [ERR_ASSERTION]: ifError got unwanted exception: test error\n// at ifErrorFrame\n// at errorFrame\n</code></pre>"
},
{
"textRaw": "`assert.match(string, regexp[, message])`",
"type": "method",
"name": "match",
"meta": {
"added": [
"v12.16.0"
],
"changes": []
},
"stability": 1,
"stabilityText": "Experimental",
"signatures": [
{
"params": [
{
"textRaw": "`string` {string}",
"name": "string",
"type": "string"
},
{
"textRaw": "`regexp` {RegExp}",
"name": "regexp",
"type": "RegExp"
},
{
"textRaw": "`message` {string|Error}",
"name": "message",
"type": "string|Error"
}
]
}
],
"desc": "<p>Expects the <code>string</code> input to match the regular expression.</p>\n<p>This feature is currently experimental and the name might change or it might be\ncompletely removed again.</p>\n<pre><code class=\"language-js\">const assert = require('assert').strict;\n\nassert.match('I will fail', /pass/);\n// AssertionError [ERR_ASSERTION]: The input did not match the regular ...\n\nassert.match(123, /pass/);\n// AssertionError [ERR_ASSERTION]: The \"string\" argument must be of type string.\n\nassert.match('I will pass', /pass/);\n// OK\n</code></pre>\n<p>If the values do not match, or if the <code>string</code> argument is of another type than\n<code>string</code>, an <a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a> is thrown with a <code>message</code> property set equal\nto the value of the <code>message</code> parameter. If the <code>message</code> parameter is\nundefined, a default error message is assigned. If the <code>message</code> parameter is an\ninstance of an <a href=\"errors.html#errors_class_error\"><code>Error</code></a> then it will be thrown instead of the\n<a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a>.</p>"
},
{
"textRaw": "`assert.notDeepEqual(actual, expected[, message])`",
"type": "method",
"name": "notDeepEqual",
"meta": {
"added": [
"v0.1.21"
],
"changes": [
{
"version": "v9.0.0",
"pr-url": "https://github.com/nodejs/node/pull/15001",
"description": "The `Error` names and messages are now properly compared"
},
{
"version": "v8.0.0",
"pr-url": "https://github.com/nodejs/node/pull/12142",
"description": "The `Set` and `Map` content is also compared"
},
{
"version": "v6.4.0, v4.7.1",
"pr-url": "https://github.com/nodejs/node/pull/8002",
"description": "Typed array slices are handled correctly now."
},
{
"version": "v6.1.0, v4.5.0",
"pr-url": "https://github.com/nodejs/node/pull/6432",
"description": "Objects with circular references can be used as inputs now."
},
{
"version": "v5.10.1, v4.4.3",
"pr-url": "https://github.com/nodejs/node/pull/5910",
"description": "Handle non-`Uint8Array` typed arrays correctly."
}
]
},
"signatures": [
{
"params": [
{
"textRaw": "`actual` {any}",
"name": "actual",
"type": "any"
},
{
"textRaw": "`expected` {any}",
"name": "expected",
"type": "any"
},
{
"textRaw": "`message` {string|Error}",
"name": "message",
"type": "string|Error"
}
]
}
],
"desc": "<p><strong>Strict assertion mode</strong></p>\n<p>An alias of <a href=\"#assert_assert_notdeepstrictequal_actual_expected_message\"><code>assert.notDeepStrictEqual()</code></a>.</p>\n<p><strong>Legacy assertion mode</strong></p>\n<blockquote>\n<p>Stability: 0 - Deprecated: Use <a href=\"#assert_assert_notdeepstrictequal_actual_expected_message\"><code>assert.notDeepStrictEqual()</code></a> instead.</p>\n</blockquote>\n<p>Tests for any deep inequality. Opposite of <a href=\"#assert_assert_deepequal_actual_expected_message\"><code>assert.deepEqual()</code></a>.</p>\n<pre><code class=\"language-js\">const assert = require('assert');\n\nconst obj1 = {\n a: {\n b: 1\n }\n};\nconst obj2 = {\n a: {\n b: 2\n }\n};\nconst obj3 = {\n a: {\n b: 1\n }\n};\nconst obj4 = Object.create(obj1);\n\nassert.notDeepEqual(obj1, obj1);\n// AssertionError: { a: { b: 1 } } notDeepEqual { a: { b: 1 } }\n\nassert.notDeepEqual(obj1, obj2);\n// OK\n\nassert.notDeepEqual(obj1, obj3);\n// AssertionError: { a: { b: 1 } } notDeepEqual { a: { b: 1 } }\n\nassert.notDeepEqual(obj1, obj4);\n// OK\n</code></pre>\n<p>If the values are deeply equal, an <a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a> is thrown with a\n<code>message</code> property set equal to the value of the <code>message</code> parameter. If the\n<code>message</code> parameter is undefined, a default error message is assigned. If the\n<code>message</code> parameter is an instance of an <a href=\"errors.html#errors_class_error\"><code>Error</code></a> then it will be thrown\ninstead of the <code>AssertionError</code>.</p>"
},
{
"textRaw": "`assert.notDeepStrictEqual(actual, expected[, message])`",
"type": "method",
"name": "notDeepStrictEqual",
"meta": {
"added": [
"v1.2.0"
],
"changes": [
{
"version": "v9.0.0",
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"description": "The `NaN` is now compared using the [SameValueZero](https://tc39.github.io/ecma262/#sec-samevaluezero) comparison."
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"version": "v9.0.0",
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{
"version": "v8.0.0",
"pr-url": "https://github.com/nodejs/node/pull/12142",
"description": "The `Set` and `Map` content is also compared"
},
{
"version": "v6.4.0, v4.7.1",
"pr-url": "https://github.com/nodejs/node/pull/8002",
"description": "Typed array slices are handled correctly now."
},
{
"version": "v6.1.0",
"pr-url": "https://github.com/nodejs/node/pull/6432",
"description": "Objects with circular references can be used as inputs now."
},
{
"version": "v5.10.1, v4.4.3",
"pr-url": "https://github.com/nodejs/node/pull/5910",
"description": "Handle non-`Uint8Array` typed arrays correctly."
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]
},
"signatures": [
{
"params": [
{
"textRaw": "`actual` {any}",
"name": "actual",
"type": "any"
},
{
"textRaw": "`expected` {any}",
"name": "expected",
"type": "any"
},
{
"textRaw": "`message` {string|Error}",
"name": "message",
"type": "string|Error"
}
]
}
],
"desc": "<p>Tests for deep strict inequality. Opposite of <a href=\"#assert_assert_deepstrictequal_actual_expected_message\"><code>assert.deepStrictEqual()</code></a>.</p>\n<pre><code class=\"language-js\">const assert = require('assert').strict;\n\nassert.notDeepStrictEqual({ a: 1 }, { a: '1' });\n// OK\n</code></pre>\n<p>If the values are deeply and strictly equal, an <a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a> is thrown\nwith a <code>message</code> property set equal to the value of the <code>message</code> parameter. If\nthe <code>message</code> parameter is undefined, a default error message is assigned. If\nthe <code>message</code> parameter is an instance of an <a href=\"errors.html#errors_class_error\"><code>Error</code></a> then it will be thrown\ninstead of the <a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a>.</p>"
},
{
"textRaw": "`assert.notEqual(actual, expected[, message])`",
"type": "method",
"name": "notEqual",
"meta": {
"added": [
"v0.1.21"
],
"changes": []
},
"signatures": [
{
"params": [
{
"textRaw": "`actual` {any}",
"name": "actual",
"type": "any"
},
{
"textRaw": "`expected` {any}",
"name": "expected",
"type": "any"
},
{
"textRaw": "`message` {string|Error}",
"name": "message",
"type": "string|Error"
}
]
}
],
"desc": "<p><strong>Strict assertion mode</strong></p>\n<p>An alias of <a href=\"#assert_assert_notstrictequal_actual_expected_message\"><code>assert.notStrictEqual()</code></a>.</p>\n<p><strong>Legacy assertion mode</strong></p>\n<blockquote>\n<p>Stability: 0 - Deprecated: Use <a href=\"#assert_assert_notstrictequal_actual_expected_message\"><code>assert.notStrictEqual()</code></a> instead.</p>\n</blockquote>\n<p>Tests shallow, coercive inequality with the <a href=\"https://tc39.github.io/ecma262/#sec-abstract-equality-comparison\">Abstract Equality Comparison</a>\n( <code>!=</code> ).</p>\n<pre><code class=\"language-js\">const assert = require('assert');\n\nassert.notEqual(1, 2);\n// OK\n\nassert.notEqual(1, 1);\n// AssertionError: 1 != 1\n\nassert.notEqual(1, '1');\n// AssertionError: 1 != '1'\n</code></pre>\n<p>If the values are equal, an <a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a> is thrown with a <code>message</code>\nproperty set equal to the value of the <code>message</code> parameter. If the <code>message</code>\nparameter is undefined, a default error message is assigned. If the <code>message</code>\nparameter is an instance of an <a href=\"errors.html#errors_class_error\"><code>Error</code></a> then it will be thrown instead of the\n<code>AssertionError</code>.</p>"
},
{
"textRaw": "`assert.notStrictEqual(actual, expected[, message])`",
"type": "method",
"name": "notStrictEqual",
"meta": {
"added": [
"v0.1.21"
],
"changes": [
{
"version": "v10.0.0",
"pr-url": "https://github.com/nodejs/node/pull/17003",
"description": "Used comparison changed from Strict Equality to `Object.is()`"
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]
},
"signatures": [
{
"params": [
{
"textRaw": "`actual` {any}",
"name": "actual",
"type": "any"
},
{
"textRaw": "`expected` {any}",
"name": "expected",
"type": "any"
},
{
"textRaw": "`message` {string|Error}",
"name": "message",
"type": "string|Error"
}
]
}
],
"desc": "<p>Tests strict inequality between the <code>actual</code> and <code>expected</code> parameters as\ndetermined by the <a href=\"https://tc39.github.io/ecma262/#sec-samevalue\">SameValue Comparison</a>.</p>\n<pre><code class=\"language-js\">const assert = require('assert').strict;\n\nassert.notStrictEqual(1, 2);\n// OK\n\nassert.notStrictEqual(1, 1);\n// AssertionError [ERR_ASSERTION]: Expected \"actual\" to be strictly unequal to:\n//\n// 1\n\nassert.notStrictEqual(1, '1');\n// OK\n</code></pre>\n<p>If the values are strictly equal, an <a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a> is thrown with a\n<code>message</code> property set equal to the value of the <code>message</code> parameter. If the\n<code>message</code> parameter is undefined, a default error message is assigned. If the\n<code>message</code> parameter is an instance of an <a href=\"errors.html#errors_class_error\"><code>Error</code></a> then it will be thrown\ninstead of the <code>AssertionError</code>.</p>"
},
{
"textRaw": "`assert.ok(value[, message])`",
"type": "method",
"name": "ok",
"meta": {
"added": [
"v0.1.21"
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"changes": [
{
"version": "v10.0.0",
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"signatures": [
{
"params": [
{
"textRaw": "`value` {any}",
"name": "value",
"type": "any"
},
{
"textRaw": "`message` {string|Error}",
"name": "message",
"type": "string|Error"
}
]
}
],
"desc": "<p>Tests if <code>value</code> is truthy. It is equivalent to\n<code>assert.equal(!!value, true, message)</code>.</p>\n<p>If <code>value</code> is not truthy, an <a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a> is thrown with a <code>message</code>\nproperty set equal to the value of the <code>message</code> parameter. If the <code>message</code>\nparameter is <code>undefined</code>, a default error message is assigned. If the <code>message</code>\nparameter is an instance of an <a href=\"errors.html#errors_class_error\"><code>Error</code></a> then it will be thrown instead of the\n<code>AssertionError</code>.\nIf no arguments are passed in at all <code>message</code> will be set to the string:\n<code>'No value argument passed to `assert.ok()`'</code>.</p>\n<p>Be aware that in the <code>repl</code> the error message will be different to the one\nthrown in a file! See below for further details.</p>\n<pre><code class=\"language-js\">const assert = require('assert').strict;\n\nassert.ok(true);\n// OK\nassert.ok(1);\n// OK\n\nassert.ok();\n// AssertionError: No value argument passed to `assert.ok()`\n\nassert.ok(false, 'it\\'s false');\n// AssertionError: it's false\n\n// In the repl:\nassert.ok(typeof 123 === 'string');\n// AssertionError: false == true\n\n// In a file (e.g. test.js):\nassert.ok(typeof 123 === 'string');\n// AssertionError: The expression evaluated to a falsy value:\n//\n// assert.ok(typeof 123 === 'string')\n\nassert.ok(false);\n// AssertionError: The expression evaluated to a falsy value:\n//\n// assert.ok(false)\n\nassert.ok(0);\n// AssertionError: The expression evaluated to a falsy value:\n//\n// assert.ok(0)\n\n// Using `assert()` works the same:\nassert(0);\n// AssertionError: The expression evaluated to a falsy value:\n//\n// assert(0)\n</code></pre>"
},
{
"textRaw": "`assert.rejects(asyncFn[, error][, message])`",
"type": "method",
"name": "rejects",
"meta": {
"added": [
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],
"changes": []
},
"signatures": [
{
"params": [
{
"textRaw": "`asyncFn` {Function|Promise}",
"name": "asyncFn",
"type": "Function|Promise"
},
{
"textRaw": "`error` {RegExp|Function|Object|Error}",
"name": "error",
"type": "RegExp|Function|Object|Error"
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"textRaw": "`message` {string}",
"name": "message",
"type": "string"
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"desc": "<p>Awaits the <code>asyncFn</code> promise or, if <code>asyncFn</code> is a function, immediately\ncalls the function and awaits the returned promise to complete. It will then\ncheck that the promise is rejected.</p>\n<p>If <code>asyncFn</code> is a function and it throws an error synchronously,\n<code>assert.rejects()</code> will return a rejected <code>Promise</code> with that error. If the\nfunction does not return a promise, <code>assert.rejects()</code> will return a rejected\n<code>Promise</code> with an <a href=\"errors.html#errors_err_invalid_return_value\"><code>ERR_INVALID_RETURN_VALUE</code></a> error. In both cases the error\nhandler is skipped.</p>\n<p>Besides the async nature to await the completion behaves identically to\n<a href=\"#assert_assert_throws_fn_error_message\"><code>assert.throws()</code></a>.</p>\n<p>If specified, <code>error</code> can be a <a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes\"><code>Class</code></a>, <a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions\"><code>RegExp</code></a>, a validation function,\nan object where each property will be tested for, or an instance of error where\neach property will be tested for including the non-enumerable <code>message</code> and\n<code>name</code> properties.</p>\n<p>If specified, <code>message</code> will be the message provided by the <a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a>\nif the <code>asyncFn</code> fails to reject.</p>\n<pre><code class=\"language-js\">(async () => {\n await assert.rejects(\n async () => {\n throw new TypeError('Wrong value');\n },\n {\n name: 'TypeError',\n message: 'Wrong value'\n }\n );\n})();\n</code></pre>\n<pre><code class=\"language-js\">(async () => {\n await assert.rejects(\n async () => {\n throw new TypeError('Wrong value');\n },\n (err) => {\n assert.strictEqual(err.name, 'TypeError');\n assert.strictEqual(err.message, 'Wrong value');\n return true;\n }\n );\n})();\n</code></pre>\n<pre><code class=\"language-js\">assert.rejects(\n Promise.reject(new Error('Wrong value')),\n Error\n).then(() => {\n // ...\n});\n</code></pre>\n<p><code>error</code> cannot be a string. If a string is provided as the second\nargument, then <code>error</code> is assumed to be omitted and the string will be used for\n<code>message</code> instead. This can lead to easy-to-miss mistakes. Please read the\nexample in <a href=\"#assert_assert_throws_fn_error_message\"><code>assert.throws()</code></a> carefully if using a string as the second\nargument gets considered.</p>"
},
{
"textRaw": "`assert.strictEqual(actual, expected[, message])`",
"type": "method",
"name": "strictEqual",
"meta": {
"added": [
"v0.1.21"
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"changes": [
{
"version": "v10.0.0",
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"signatures": [
{
"params": [
{
"textRaw": "`actual` {any}",
"name": "actual",
"type": "any"
},
{
"textRaw": "`expected` {any}",
"name": "expected",
"type": "any"
},
{
"textRaw": "`message` {string|Error}",
"name": "message",
"type": "string|Error"
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]
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],
"desc": "<p>Tests strict equality between the <code>actual</code> and <code>expected</code> parameters as\ndetermined by the <a href=\"https://tc39.github.io/ecma262/#sec-samevalue\">SameValue Comparison</a>.</p>\n<pre><code class=\"language-js\">const assert = require('assert').strict;\n\nassert.strictEqual(1, 2);\n// AssertionError [ERR_ASSERTION]: Expected inputs to be strictly equal:\n//\n// 1 !== 2\n\nassert.strictEqual(1, 1);\n// OK\n\nassert.strictEqual('Hello foobar', 'Hello World!');\n// AssertionError [ERR_ASSERTION]: Expected inputs to be strictly equal:\n// + actual - expected\n//\n// + 'Hello foobar'\n// - 'Hello World!'\n// ^\n\nconst apples = 1;\nconst oranges = 2;\nassert.strictEqual(apples, oranges, `apples ${apples} !== oranges ${oranges}`);\n// AssertionError [ERR_ASSERTION]: apples 1 !== oranges 2\n\nassert.strictEqual(1, '1', new TypeError('Inputs are not identical'));\n// TypeError: Inputs are not identical\n</code></pre>\n<p>If the values are not strictly equal, an <a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a> is thrown with a\n<code>message</code> property set equal to the value of the <code>message</code> parameter. If the\n<code>message</code> parameter is undefined, a default error message is assigned. If the\n<code>message</code> parameter is an instance of an <a href=\"errors.html#errors_class_error\"><code>Error</code></a> then it will be thrown\ninstead of the <a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a>.</p>"
},
{
"textRaw": "`assert.throws(fn[, error][, message])`",
"type": "method",
"name": "throws",
"meta": {
"added": [
"v0.1.21"
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"changes": [
{
"version": "v10.2.0",
"pr-url": "https://github.com/nodejs/node/pull/20485",
"description": "The `error` parameter can be an object containing regular expressions now."
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{
"version": "v9.9.0",
"pr-url": "https://github.com/nodejs/node/pull/17584",
"description": "The `error` parameter can now be an object as well."
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{
"version": "v4.2.0",
"pr-url": "https://github.com/nodejs/node/pull/3276",
"description": "The `error` parameter can now be an arrow function."
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"signatures": [
{
"params": [
{
"textRaw": "`fn` {Function}",
"name": "fn",
"type": "Function"
},
{
"textRaw": "`error` {RegExp|Function|Object|Error}",
"name": "error",
"type": "RegExp|Function|Object|Error"
},
{
"textRaw": "`message` {string}",
"name": "message",
"type": "string"
}
]
}
],
"desc": "<p>Expects the function <code>fn</code> to throw an error.</p>\n<p>If specified, <code>error</code> can be a <a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes\"><code>Class</code></a>, <a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions\"><code>RegExp</code></a>, a validation function,\na validation object where each property will be tested for strict deep equality,\nor an instance of error where each property will be tested for strict deep\nequality including the non-enumerable <code>message</code> and <code>name</code> properties. When\nusing an object, it is also possible to use a regular expression, when\nvalidating against a string property. See below for examples.</p>\n<p>If specified, <code>message</code> will be appended to the message provided by the\n<code>AssertionError</code> if the <code>fn</code> call fails to throw or in case the error validation\nfails.</p>\n<p>Custom validation object/error instance:</p>\n<pre><code class=\"language-js\">const err = new TypeError('Wrong value');\nerr.code = 404;\nerr.foo = 'bar';\nerr.info = {\n nested: true,\n baz: 'text'\n};\nerr.reg = /abc/i;\n\nassert.throws(\n () => {\n throw err;\n },\n {\n name: 'TypeError',\n message: 'Wrong value',\n info: {\n nested: true,\n baz: 'text'\n }\n // Only properties on the validation object will be tested for.\n // Using nested objects requires all properties to be present. Otherwise\n // the validation is going to fail.\n }\n);\n\n// Using regular expressions to validate error properties:\nassert.throws(\n () => {\n throw err;\n },\n {\n // The `name` and `message` properties are strings and using regular\n // expressions on those will match against the string. If they fail, an\n // error is thrown.\n name: /^TypeError$/,\n message: /Wrong/,\n foo: 'bar',\n info: {\n nested: true,\n // It is not possible to use regular expressions for nested properties!\n baz: 'text'\n },\n // The `reg` property contains a regular expression and only if the\n // validation object contains an identical regular expression, it is going\n // to pass.\n reg: /abc/i\n }\n);\n\n// Fails due to the different `message` and `name` properties:\nassert.throws(\n () => {\n const otherErr = new Error('Not found');\n // Copy all enumerable properties from `err` to `otherErr`.\n for (const [key, value] of Object.entries(err)) {\n otherErr[key] = value;\n }\n throw otherErr;\n },\n // The error's `message` and `name` properties will also be checked when using\n // an error as validation object.\n err\n);\n</code></pre>\n<p>Validate instanceof using constructor:</p>\n<pre><code class=\"language-js\">assert.throws(\n () => {\n throw new Error('Wrong value');\n },\n Error\n);\n</code></pre>\n<p>Validate error message using <a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions\"><code>RegExp</code></a>:</p>\n<p>Using a regular expression runs <code>.toString</code> on the error object, and will\ntherefore also include the error name.</p>\n<pre><code class=\"language-js\">assert.throws(\n () => {\n throw new Error('Wrong value');\n },\n /^Error: Wrong value$/\n);\n</code></pre>\n<p>Custom error validation:</p>\n<p>The function must return <code>true</code> to indicate all internal validations passed.\nIt will otherwise fail with an <a href=\"#assert_class_assert_assertionerror\"><code>AssertionError</code></a>.</p>\n<pre><code class=\"language-js\">assert.throws(\n () => {\n throw new Error('Wrong value');\n },\n (err) => {\n assert(err instanceof Error);\n assert(/value/.test(err));\n // Avoid returning anything from validation functions besides `true`.\n // Otherwise, it's not clear what part of the validation failed. Instead,\n // throw an error about the specific validation that failed (as done in this\n // example) and add as much helpful debugging information to that error as\n // possible.\n return true;\n },\n 'unexpected error'\n);\n</code></pre>\n<p><code>error</code> cannot be a string. If a string is provided as the second\nargument, then <code>error</code> is assumed to be omitted and the string will be used for\n<code>message</code> instead. This can lead to easy-to-miss mistakes. Using the same\nmessage as the thrown error message is going to result in an\n<code>ERR_AMBIGUOUS_ARGUMENT</code> error. Please read the example below carefully if using\na string as the second argument gets considered:</p>\n<!-- eslint-disable no-restricted-syntax -->\n<pre><code class=\"language-js\">function throwingFirst() {\n throw new Error('First');\n}\n\nfunction throwingSecond() {\n throw new Error('Second');\n}\n\nfunction notThrowing() {}\n\n// The second argument is a string and the input function threw an Error.\n// The first case will not throw as it does not match for the error message\n// thrown by the input function!\nassert.throws(throwingFirst, 'Second');\n// In the next example the message has no benefit over the message from the\n// error and since it is not clear if the user intended to actually match\n// against the error message, Node.js throws an `ERR_AMBIGUOUS_ARGUMENT` error.\nassert.throws(throwingSecond, 'Second');\n// TypeError [ERR_AMBIGUOUS_ARGUMENT]\n\n// The string is only used (as message) in case the function does not throw:\nassert.throws(notThrowing, 'Second');\n// AssertionError [ERR_ASSERTION]: Missing expected exception: Second\n\n// If it was intended to match for the error message do this instead:\n// It does not throw because the error messages match.\nassert.throws(throwingSecond, /Second$/);\n\n// If the error message does not match, an AssertionError is thrown.\nassert.throws(throwingFirst, /Second$/);\n// AssertionError [ERR_ASSERTION]\n</code></pre>\n<p>Due to the confusing error-prone notation, avoid a string as the second\nargument.</p>"
}
],
"type": "module",
"displayName": "Assert"
}
]
}