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Assert

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Assertion utilities.

Installation

npm install @stdlib/assert

Usage

var assert = require( '@stdlib/assert' );

assert

Namespace providing utilities for data type testing and feature detection.

var o = assert;
// returns {...}

To validate the built-in JavaScript data types, the namespace includes the following assertion utilities:

[isArray( value )][@stdlib/assert/is-array]: test if a value is an array.
[isBoolean( value )][@stdlib/assert/is-boolean]: test if a value is a boolean.
[isDateObject( value )][@stdlib/assert/is-date-object]: test if a value is a Date object.
[isFunction( value )][@stdlib/assert/is-function]: test if a value is a function.
[isnan( value )][@stdlib/assert/is-nan]: test if a value is NaN.
[isNull( value )][@stdlib/assert/is-null]: test if a value is null.
[isNumber( value )][@stdlib/assert/is-number]: test if a value is a number.
[isObject( value )][@stdlib/assert/is-object]: test if a value is an object.
[isRegExp( value )][@stdlib/assert/is-regexp]: test if a value is a regular expression.
[isString( value )][@stdlib/assert/is-string]: test if a value is a string.
[isSymbol( value )][@stdlib/assert/is-symbol]: test if a value is a symbol.
[isUndefined( value )][@stdlib/assert/is-undefined]: test if a value is undefined.

For primitive types having corresponding object wrappers, assertion utilities provide isObject and isPrimitive methods to test for either objects or primitives, respectively.

var Boolean = require( '@stdlib/boolean/ctor' );
var isBoolean = require( '@stdlib/assert/is-boolean' );

var bool = isBoolean.isObject( new Boolean( false ) );
// returns true

bool = isBoolean.isObject( false );
// returns false

bool = isBoolean.isPrimitive( false );
// returns true

Many of the assertion utilities have corresponding packages that test whether array elements are of the given data type:

[isArrayArray( value )][@stdlib/assert/is-array-array]: test if a value is an array of arrays.
[isBooleanArray( value )][@stdlib/assert/is-boolean-array]: test if a value is an array-like object of booleans.
[isDateObjectArray( value )][@stdlib/assert/is-date-object-array]: test if a value is an array-like object containing only Date objects.
[isFunctionArray( value )][@stdlib/assert/is-function-array]: test if a value is an array-like object containing only functions.
[isNaNArray( value )][@stdlib/assert/is-nan-array]: test if a value is an array-like object containing only NaN values.
[isNullArray( value )][@stdlib/assert/is-null-array]: test if a value is an array-like object containing only null values.
[isNumberArray( value )][@stdlib/assert/is-number-array]: test if a value is an array-like object of numbers.
[isObjectArray( value )][@stdlib/assert/is-object-array]: test if a value is an array-like object containing only objects.
[isStringArray( value )][@stdlib/assert/is-string-array]: test if a value is an array of strings.
[isSymbolArray( value )][@stdlib/assert/is-symbol-array]: test if a value is an array-like object containing only symbols.

Where applicable, similar to the assertion utilities for built-in data types, array assertion utilities provides methods for testing for an array of primitives or objects.

var isStringArray = require( '@stdlib/assert/is-string-array' );

var bool = isStringArray( [ 'hello', 'world' ] );
// returns true

bool = isStringArray.primitives( [ 'hello', 'world' ] );
// returns true

bool = isStringArray.objects( [ 'hello', 'world' ] );
// returns false

bool = isStringArray.objects( [ new String( 'hello' ), new String( 'world' ) ] );
// returns true

The namespace also contains utilities to test for numbers within a certain range or for numbers satisfying a particular "type":

[isCubeNumber( value )][@stdlib/assert/is-cube-number]: test if a value is a cube number.
[isIntegerArray( value )][@stdlib/assert/is-integer-array]: test if a value is an array-like object containing only integers.
[isInteger( value )][@stdlib/assert/is-integer]: test if a value is a number having an integer value.
[isNegativeIntegerArray( value )][@stdlib/assert/is-negative-integer-array]: test if a value is an array-like object containing only negative integers.
[isNegativeInteger( value )][@stdlib/assert/is-negative-integer]: test if a value is a number having a negative integer value.
[isNegativeNumberArray( value )][@stdlib/assert/is-negative-number-array]: test if a value is an array-like object containing only negative numbers.
[isNegativeNumber( value )][@stdlib/assert/is-negative-number]: test if a value is a number having a negative value.
[isNonNegativeIntegerArray( value )][@stdlib/assert/is-nonnegative-integer-array]: test if a value is an array-like object containing only nonnegative integers.
[isNonNegativeInteger( value )][@stdlib/assert/is-nonnegative-integer]: test if a value is a number having a nonnegative integer value.
[isNonNegativeNumberArray( value )][@stdlib/assert/is-nonnegative-number-array]: test if a value is an array-like object containing only nonnegative numbers.
[isNonNegativeNumber( value )][@stdlib/assert/is-nonnegative-number]: test if a value is a number having a nonnegative value.
[isNonPositiveIntegerArray( value )][@stdlib/assert/is-nonpositive-integer-array]: test if a value is an array-like object containing only nonpositive integers.
[isNonPositiveInteger( value )][@stdlib/assert/is-nonpositive-integer]: test if a value is a number having a nonpositive integer value.
[isNonPositiveNumberArray( value )][@stdlib/assert/is-nonpositive-number-array]: test if a value is an array-like object containing only nonpositive numbers.
[isNonPositiveNumber( value )][@stdlib/assert/is-nonpositive-number]: test if a value is a number having a nonpositive value.
[isPositiveIntegerArray( value )][@stdlib/assert/is-positive-integer-array]: test if a value is an array-like object containing only positive integers.
[isPositiveInteger( value )][@stdlib/assert/is-positive-integer]: test if a value is a number having a positive integer value.
[isPositiveNumberArray( value )][@stdlib/assert/is-positive-number-array]: test if a value is an array-like object containing only positive numbers.
[isPositiveNumber( value )][@stdlib/assert/is-positive-number]: test if a value is a number having a positive value.
[isSafeIntegerArray( value )][@stdlib/assert/is-safe-integer-array]: test if a value is an array-like object containing only safe integers.
[isSafeInteger( value )][@stdlib/assert/is-safe-integer]: test if a value is a number having a safe integer value.
[isSquareNumber( value )][@stdlib/assert/is-square-number]: test if a value is a square number.
[isSquareTriangularNumber( value )][@stdlib/assert/is-square-triangular-number]: test if a value is a square triangular number.
[isTriangularNumber( value )][@stdlib/assert/is-triangular-number]: test if a value is a triangular number.

The namespace provides utilities for validating typed arrays:

[isFloat32Array( value )][@stdlib/assert/is-float32array]: test if a value is a Float32Array.
[isFloat64Array( value )][@stdlib/assert/is-float64array]: test if a value is a Float64Array.
[isInt16Array( value )][@stdlib/assert/is-int16array]: test if a value is an Int16Array.
[isInt32Array( value )][@stdlib/assert/is-int32array]: test if a value is an Int32Array.
[isInt8Array( value )][@stdlib/assert/is-int8array]: test if a value is an Int8Array.
[isUint16Array( value )][@stdlib/assert/is-uint16array]: test if a value is a Uint16Array.
[isUint32Array( value )][@stdlib/assert/is-uint32array]: test if a value is a Uint32Array.
[isUint8Array( value )][@stdlib/assert/is-uint8array]: test if a value is a Uint8Array.
[isUint8ClampedArray( value )][@stdlib/assert/is-uint8clampedarray]: test if a value is a Uint8ClampedArray.

The namespace includes utilities for validating ndarrays (n-dimensional arrays).

[isCentrosymmetricMatrix( value )][@stdlib/assert/is-centrosymmetric-matrix]: test if a value is a centrosymmetric matrix.
[isComplex128MatrixLike( value )][@stdlib/assert/is-complex128matrix-like]: test if a value is a 2-dimensional ndarray-like object containing double-precision complex floating-point numbers.
[isComplex128ndarrayLike( value )][@stdlib/assert/is-complex128ndarray-like]: test if a value is an ndarray-like object containing double-precision complex floating-point numbers.
[isComplex128VectorLike( value )][@stdlib/assert/is-complex128vector-like]: test if a value is a 1-dimensional ndarray-like object containing double-precision complex floating-point numbers.
[isComplex64MatrixLike( value )][@stdlib/assert/is-complex64matrix-like]: test if a value is a 2-dimensional ndarray-like object containing single-precision complex floating-point numbers.
[isComplex64ndarrayLike( value )][@stdlib/assert/is-complex64ndarray-like]: test if a value is an ndarray-like object containing single-precision complex floating-point numbers.
[isComplex64VectorLike( value )][@stdlib/assert/is-complex64vector-like]: test if a value is a 1-dimensional ndarray-like object containing single-precision complex floating-point numbers.
[isFloat32MatrixLike( value )][@stdlib/assert/is-float32matrix-like]: test if a value is a 2-dimensional ndarray-like object containing single-precision floating-point numbers.
[isFloat32ndarrayLike( value )][@stdlib/assert/is-float32ndarray-like]: test if a value is an ndarray-like object containing single-precision floating-point numbers.
[isFloat32VectorLike( value )][@stdlib/assert/is-float32vector-like]: test if a value is a 1-dimensional ndarray-like object containing single-precision floating-point numbers.
[isFloat64MatrixLike( value )][@stdlib/assert/is-float64matrix-like]: test if a value is a 2-dimensional ndarray-like object containing double-precision floating-point numbers.
[isFloat64ndarrayLike( value )][@stdlib/assert/is-float64ndarray-like]: test if a value is an ndarray-like object containing double-precision floating-point numbers.
[isFloat64VectorLike( value )][@stdlib/assert/is-float64vector-like]: test if a value is a 1-dimensional ndarray-like object containing double-precision floating-point numbers.
[isMatrixLike( value )][@stdlib/assert/is-matrix-like]: test if a value is 2-dimensional ndarray-like object.
[isndarrayLike( value )][@stdlib/assert/is-ndarray-like]: test if a value is ndarray-like.
[isNonSymmetricMatrix( value )][@stdlib/assert/is-nonsymmetric-matrix]: test if a value is a non-symmetric matrix.
[isPersymmetricMatrix( value )][@stdlib/assert/is-persymmetric-matrix]: test if a value is a persymmetric matrix.
[isSkewCentrosymmetricMatrix( value )][@stdlib/assert/is-skew-centrosymmetric-matrix]: test if a value is a skew-centrosymmetric matrix.
[isSkewPersymmetricMatrix( value )][@stdlib/assert/is-skew-persymmetric-matrix]: test if a value is a skew-persymmetric matrix.
[isSkewSymmetricMatrix( value )][@stdlib/assert/is-skew-symmetric-matrix]: test if a value is a skew-symmetric matrix.
[isSquareMatrix( value )][@stdlib/assert/is-square-matrix]: test if a value is a 2-dimensional ndarray-like object having equal dimensions.
[isSymmetricMatrix( value )][@stdlib/assert/is-symmetric-matrix]: test if a value is a symmetric matrix.
[isVectorLike( value )][@stdlib/assert/is-vector-like]: test if a value is a 1-dimensional ndarray-like object.

The namespace includes utilities for validating complex numbers and arrays of complex numbers:

[isComplexLike( value )][@stdlib/assert/is-complex-like]: test if a value is a complex number-like object.
[isComplexTypedArrayLike( value )][@stdlib/assert/is-complex-typed-array-like]: test if a value is complex-typed-array-like.
[isComplexTypedArray( value )][@stdlib/assert/is-complex-typed-array]: test if a value is a complex typed array.
[isComplex( value )][@stdlib/assert/is-complex]: test if a value is a 64-bit or 128-bit complex number.
[isComplex128( value )][@stdlib/assert/is-complex128]: test if a value is a 128-bit complex number.
[isComplex128Array( value )][@stdlib/assert/is-complex128array]: test if a value is a Complex128Array.
[isComplex64( value )][@stdlib/assert/is-complex64]: test if a value is a 64-bit complex number.
[isComplex64Array( value )][@stdlib/assert/is-complex64array]: test if a value is a Complex64Array.

The namespace includes utilities for validating other special arrays or buffers:

[isAccessorArray( value )][@stdlib/assert/is-accessor-array]: test if a value is an array-like object supporting the accessor (get/set) protocol.
[isArrayLength( value )][@stdlib/assert/is-array-length]: test if a value is a valid array length.
[isArrayLikeObject( value )][@stdlib/assert/is-array-like-object]: test if a value is an array-like object.
[isArrayLike( value )][@stdlib/assert/is-array-like]: test if a value is array-like.
[isArrayBufferView( value )][@stdlib/assert/is-arraybuffer-view]: test if a value is an ArrayBuffer view.
[isArrayBuffer( value )][@stdlib/assert/is-arraybuffer]: test if a value is an ArrayBuffer.
[isBetweenArray( value, a, b[, left, right] )][@stdlib/assert/is-between-array]: test if a value is an array-like object where every element is between two values.
[isBigInt64Array( value )][@stdlib/assert/is-bigint64array]: test if a value is a BigInt64Array.
[isBigUint64Array( value )][@stdlib/assert/is-biguint64array]: test if a value is a BigUint64Array.
[isCircularArray( value )][@stdlib/assert/is-circular-array]: test if a value is an array containing a circular reference.
[isEmptyArrayLikeObject( value )][@stdlib/assert/is-empty-array-like-object]: test if a value is an empty array-like object.
[isEmptyArray( value )][@stdlib/assert/is-empty-array]: test if a value is an empty array.
[isFalsyArray( value )][@stdlib/assert/is-falsy-array]: test if a value is an array-like object containing only falsy values.
[isFiniteArray( value )][@stdlib/assert/is-finite-array]: test if a value is an array-like object containing only finite numbers.
[isNumericArray( value )][@stdlib/assert/is-numeric-array]: test if a value is a numeric array.
[isPlainObjectArray( value )][@stdlib/assert/is-plain-object-array]: test if a value is an array-like object containing only plain objects.
[isProbabilityArray( value )][@stdlib/assert/is-probability-array]: test if a value is an array-like object containing only probabilities.
[isSameArray( v1, v2 )][@stdlib/assert/is-same-array]: test if two arguments are both generic arrays and have the same values.
[isSameComplex128Array( v1, v2 )][@stdlib/assert/is-same-complex128array]: test if two arguments are both Complex128Arrays and have the same values.
[isSameComplex64Array( v1, v2 )][@stdlib/assert/is-same-complex64array]: test if two arguments are both Complex64Arrays and have the same values.
[isSameFloat32Array( v1, v2 )][@stdlib/assert/is-same-float32array]: test if two arguments are both Float32Arrays and have the same values.
[isSameFloat64Array( v1, v2 )][@stdlib/assert/is-same-float64array]: test if two arguments are both Float64Arrays and have the same values.
[isSharedArrayBuffer( value )][@stdlib/assert/is-sharedarraybuffer]: test if a value is a SharedArrayBuffer.
[isTruthyArray( value )][@stdlib/assert/is-truthy-array]: test if a value is an array-like object containing only truthy values.
[isTypedArrayLength( value )][@stdlib/assert/is-typed-array-length]: test if a value is a valid typed array length.
[isTypedArrayLike( value )][@stdlib/assert/is-typed-array-like]: test if a value is typed-array-like.
[isTypedArray( value )][@stdlib/assert/is-typed-array]: test if a value is a typed array.
[isUnityProbabilityArray( value )][@stdlib/assert/is-unity-probability-array]: test if a value is an array of probabilities that sum to one.

To test for error objects, the namespace includes the following utilities:

[isError( value )][@stdlib/assert/is-error]: test if a value is an Error object.
[isEvalError( value )][@stdlib/assert/is-eval-error]: test if a value is an EvalError object.
[isRangeError( value )][@stdlib/assert/is-range-error]: test if a value is a RangeError object.
[isReferenceError( value )][@stdlib/assert/is-reference-error]: test if a value is a ReferenceError object.
[isSyntaxError( value )][@stdlib/assert/is-syntax-error]: test if a value is a SyntaxError object.
[isTypeError( value )][@stdlib/assert/is-type-error]: test if a value is a TypeError object.
[isURIError( value )][@stdlib/assert/is-uri-error]: test if a value is a URIError object.

The namespace exposes the following constants concerning the current running process:

[IS_BIG_ENDIAN][@stdlib/assert/is-big-endian]: check if an environment is big endian.
[IS_BROWSER][@stdlib/assert/is-browser]: check if the runtime is a web browser.
[IS_DARWIN][@stdlib/assert/is-darwin]: boolean indicating if the current process is running on Darwin.
[IS_DOCKER][@stdlib/assert/is-docker]: check if the process is running in a Docker container.
[IS_ELECTRON_MAIN][@stdlib/assert/is-electron-main]: check if the runtime is the main Electron process.
[IS_ELECTRON_RENDERER][@stdlib/assert/is-electron-renderer]: check if the runtime is the Electron renderer process.
[IS_ELECTRON][@stdlib/assert/is-electron]: check if the runtime is Electron.
[IS_LITTLE_ENDIAN][@stdlib/assert/is-little-endian]: check if an environment is little endian.
[IS_MOBILE][@stdlib/assert/is-mobile]: check if the current environment is a mobile device.
[IS_NODE][@stdlib/assert/is-node]: check if the runtime is Node.js.
[IS_TOUCH_DEVICE][@stdlib/assert/is-touch-device]: check if the current environment is a touch device.
[IS_WEB_WORKER][@stdlib/assert/is-web-worker]: check if the runtime is a web worker.
[IS_WINDOWS][@stdlib/assert/is-windows]: boolean indicating if the current process is running on Windows.

To test whether a runtime environment supports certain features, the namespace includes the following utilities:

[hasArrayBufferSupport()][@stdlib/assert/has-arraybuffer-support]: detect native ArrayBuffer support.
[hasArrowFunctionSupport()][@stdlib/assert/has-arrow-function-support]: detect native arrow function support.
[hasAsyncAwaitSupport()][@stdlib/assert/has-async-await-support]: detect native async/await support.
[hasAsyncIteratorSymbolSupport()][@stdlib/assert/has-async-iterator-symbol-support]: detect native Symbol.asyncIterator support.
[hasBigIntSupport()][@stdlib/assert/has-bigint-support]: detect native BigInt support.
[hasBigInt64ArraySupport()][@stdlib/assert/has-bigint64array-support]: detect native BigInt64Array support.
[hasBigUint64ArraySupport()][@stdlib/assert/has-biguint64array-support]: detect native BigUint64Array support.
[hasClassSupport()][@stdlib/assert/has-class-support]: detect native class support.
[hasDataViewSupport()][@stdlib/assert/has-dataview-support]: detect native DataView support.
[hasDefinePropertiesSupport()][@stdlib/assert/has-define-properties-support]: detect Object.defineProperties support.
[hasDefinePropertySupport()][@stdlib/assert/has-define-property-support]: detect Object.defineProperty support.
[hasFloat32ArraySupport()][@stdlib/assert/has-float32array-support]: detect native Float32Array support.
[hasFloat64ArraySupport()][@stdlib/assert/has-float64array-support]: detect native Float64Array support.
[hasFunctionNameSupport()][@stdlib/assert/has-function-name-support]: detect native function name support.
[hasGeneratorSupport()][@stdlib/assert/has-generator-support]: detect native generator function support.
[hasGlobalThisSupport()][@stdlib/assert/has-globalthis-support]: detect globalThis support.
[hasInt16ArraySupport()][@stdlib/assert/has-int16array-support]: detect native Int16Array support.
[hasInt32ArraySupport()][@stdlib/assert/has-int32array-support]: detect native Int32Array support.
[hasInt8ArraySupport()][@stdlib/assert/has-int8array-support]: detect native Int8Array support.
[hasIteratorSymbolSupport()][@stdlib/assert/has-iterator-symbol-support]: detect native Symbol.iterator support.
[hasMapSupport()][@stdlib/assert/has-map-support]: detect native Map support.
[hasNodeBufferSupport()][@stdlib/assert/has-node-buffer-support]: detect native Buffer support.
[hasProxySupport()][@stdlib/assert/has-proxy-support]: detect native Proxy support.
[hasSetSupport()][@stdlib/assert/has-set-support]: detect native Set support.
[hasSharedArrayBufferSupport()][@stdlib/assert/has-sharedarraybuffer-support]: detect native SharedArrayBuffer support.
[hasSymbolSupport()][@stdlib/assert/has-symbol-support]: detect native Symbol support.
[hasToStringTagSupport()][@stdlib/assert/has-tostringtag-support]: detect native Symbol.toStringTag support.
[hasUint16ArraySupport()][@stdlib/assert/has-uint16array-support]: detect native Uint16Array support.
[hasUint32ArraySupport()][@stdlib/assert/has-uint32array-support]: detect native Uint32Array support.
[hasUint8ArraySupport()][@stdlib/assert/has-uint8array-support]: detect native Uint8Array support.
[hasUint8ClampedArraySupport()][@stdlib/assert/has-uint8clampedarray-support]: detect native Uint8ClampedArray support.
[hasWebAssemblySupport()][@stdlib/assert/has-wasm-support]: detect native WebAssembly support.
[hasWeakMapSupport()][@stdlib/assert/has-weakmap-support]: detect native WeakMap support.
[hasWeakSetSupport()][@stdlib/assert/has-weakset-support]: detect native WeakSet support.

The remaining namespace utilities are as follows:

[contains( val, searchValue[, position] )][@stdlib/assert/contains]: test if an array-like value contains a search value.
[deepEqual( a, b )][@stdlib/assert/deep-equal]: test for deep equality between two values.
[deepHasOwnProp( value, path[, options] )][@stdlib/assert/deep-has-own-property]: test whether an object contains a nested key path.
[deepHasProp( value, path[, options] )][@stdlib/assert/deep-has-property]: test whether an object contains a nested key path, either own or inherited.
[hasOwnProp( value, property )][@stdlib/assert/has-own-property]: test if an object has a specified property.
[hasProp( value, property )][@stdlib/assert/has-property]: test if an object has a specified property, either own or inherited.
[hasUTF16SurrogatePairAt( string, position )][@stdlib/assert/has-utf16-surrogate-pair-at]: test if a position in a string marks the start of a UTF-16 surrogate pair.
[instanceOf( value, constructor )][@stdlib/assert/instance-of]: test whether a value has in its prototype chain a specified constructor as a prototype property.
[isAbsoluteHttpURI( value )][@stdlib/assert/is-absolute-http-uri]: test whether a value is an absolute HTTP(S) URI.
[isAbsolutePath( value )][@stdlib/assert/is-absolute-path]: test if a value is an absolute path.
[isAbsoluteURI( value )][@stdlib/assert/is-absolute-uri]: test whether a value is an absolute URI.
[isAccessorPropertyIn( value, property )][@stdlib/assert/is-accessor-property-in]: test if an object's own or inherited property has an accessor descriptor.
[isAccessorProperty( value, property )][@stdlib/assert/is-accessor-property]: test if an object's own property has an accessor descriptor.
[isAlphagram( value )][@stdlib/assert/is-alphagram]: test if a value is an alphagram.
[isAlphaNumeric( value )][@stdlib/assert/is-alphanumeric]: test whether a string contains only alphanumeric characters.
[isAnagram( str, value )][@stdlib/assert/is-anagram]: test if a value is an anagram.
[isArguments( value )][@stdlib/assert/is-arguments]: test if a value is an arguments object.
[isArrowFunction( value )][@stdlib/assert/is-arrow-function]: test if a value is an arrow function.
[isASCII( value )][@stdlib/assert/is-ascii]: test whether a character belongs to the ASCII character set and whether this is true for all characters in a provided string.
[isBetween( value, a, b[, left, right] )][@stdlib/assert/is-between]: test if a value is between two values.
[isBigInt( value )][@stdlib/assert/is-bigint]: test if a value is a BigInt.
[isBinaryString( value )][@stdlib/assert/is-binary-string]: test if a value is a binary string.
[isBlankString( value )][@stdlib/assert/is-blank-string]: test if a value is a blank string.
[isBoxedPrimitive( value )][@stdlib/assert/is-boxed-primitive]: test if a value is a JavaScript boxed primitive.
[isBuffer( value )][@stdlib/assert/is-buffer]: test if a value is a Buffer object.
[isCamelcase( value )][@stdlib/assert/is-camelcase]: test if a value is a camelcase string.
[isCapitalized( value )][@stdlib/assert/is-capitalized]: test if a value is a string having an uppercase first character.
[isCircular( value )][@stdlib/assert/is-circular]: test if a value is a plain object containing a circular reference.
[isCircular( value )][@stdlib/assert/is-circular]: test if an object-like value contains a circular reference.
[isClass( value )][@stdlib/assert/is-class]: test if a value is a class.
[isCollection( value )][@stdlib/assert/is-collection]: test if a value is a collection.
[isComposite( value )][@stdlib/assert/is-composite]: test if a value is a composite number.
[isConfigurablePropertyIn( value, property )][@stdlib/assert/is-configurable-property-in]: test if an object's own or inherited property is configurable.
[isConfigurableProperty( value, property )][@stdlib/assert/is-configurable-property]: test if an object's own property is configurable.
[isConstantcase( value )][@stdlib/assert/is-constantcase]: test if a value is a constantcase string.
[isCurrentYear( value )][@stdlib/assert/is-current-year]: test if a value is the current year.
[isDataPropertyIn( value, property )][@stdlib/assert/is-data-property-in]: test if an object's own or inherited property has a data descriptor.
[isDataProperty( value, property )][@stdlib/assert/is-data-property]: test if an object's own property has a data descriptor.
[isDataView( value )][@stdlib/assert/is-dataview]: test if a value is a DataView.
[isDigitString( value )][@stdlib/assert/is-digit-string]: test whether a string contains only numeric digits.
[isDomainName( value )][@stdlib/assert/is-domain-name]: test if a value is a domain name.
[isDurationString( value )][@stdlib/assert/is-duration-string]: test if a value is a duration string.
[isEmailAddress( value )][@stdlib/assert/is-email-address]: test if a value is an email address.
[isEmptyCollection( value )][@stdlib/assert/is-empty-collection]: test if a value is an empty collection.
[isEmptyObject( value )][@stdlib/assert/is-empty-object]: test if a value is an empty object.
[isEmptyString( value )][@stdlib/assert/is-empty-string]: test if a value is an empty string.
[isEnumerablePropertyIn( value, property )][@stdlib/assert/is-enumerable-property-in]: test if an object's own or inherited property is enumerable.
[isEnumerableProperty( value, property )][@stdlib/assert/is-enumerable-property]: test if an object's own property is enumerable.
[isEven( value )][@stdlib/assert/is-even]: test if a value is an even number.
[isFalsy( value )][@stdlib/assert/is-falsy]: test if a value is falsy.
[isFinite( value )][@stdlib/assert/is-finite]: test if a value is a finite number.
[isGeneratorObjectLike( value )][@stdlib/assert/is-generator-object-like]: test if a value is generator object-like.
[isGeneratorObject( value )][@stdlib/assert/is-generator-object]: test if a value is a generator object.
[isgzipBuffer( value )][@stdlib/assert/is-gzip-buffer]: test if a value is a gzip buffer.
[isHexString( value )][@stdlib/assert/is-hex-string]: test whether a string contains only hexadecimal digits.
[isInfinite( value )][@stdlib/assert/is-infinite]: test if a value is an infinite number.
[isInheritedProperty( value, property )][@stdlib/assert/is-inherited-property]: test if an object has an inherited property.
[isIterableLike( value )][@stdlib/assert/is-iterable-like]: test if a value is iterable-like.
[isIteratorLike( value )][@stdlib/assert/is-iterator-like]: test if a value is iterator-like.
[isJSON( value )][@stdlib/assert/is-json]: test if a value is a parseable JSON string.
[isKebabcase( value )][@stdlib/assert/is-kebabcase]: test if a value is a string in kebab case.
[isLeapYear( [value] )][@stdlib/assert/is-leap-year]: test if a value corresponds to a leap year in the Gregorian calendar.
[isLocalhost( value )][@stdlib/assert/is-localhost]: test whether a value is a localhost hostname.
[isLowercase( value )][@stdlib/assert/is-lowercase]: test if a value is a lowercase string.
[isMethodIn( value, property )][@stdlib/assert/is-method-in]: test if an object has a specified method name, either own or inherited.
[isMethod( value, property )][@stdlib/assert/is-method]: test if an object has a specified method name.
[isMultiSlice( value )][@stdlib/assert/is-multi-slice]: test if a value is a MultiSlice.
[isNamedTypedTupleLike( value )][@stdlib/assert/is-named-typed-tuple-like]: test if a value is named typed tuple-like.
[isNativeFunction( value )][@stdlib/assert/is-native-function]: test if a value is a native function.
[isNegativeZero( value )][@stdlib/assert/is-negative-zero]: test if a value is a number equal to negative zero.
[isNodeBuiltin( value )][@stdlib/assert/is-node-builtin]: test whether a string matches a Node.js built-in module name.
[isNodeDuplexStreamLike( value )][@stdlib/assert/is-node-duplex-stream-like]: test if a value is Node duplex stream-like.
[isNodeReadableStreamLike( value )][@stdlib/assert/is-node-readable-stream-like]: test if a value is Node readable stream-like.
[isNodeREPL()][@stdlib/assert/is-node-repl]: check if running in a Node.js REPL environment.
[isNodeStreamLike( value )][@stdlib/assert/is-node-stream-like]: test if a value is Node stream-like.
[isNodeTransformStreamLike( value )][@stdlib/assert/is-node-transform-stream-like]: test if a value is Node transform stream-like.
[isNodeWritableStreamLike( value )][@stdlib/assert/is-node-writable-stream-like]: test if a value is Node writable stream-like.
[isNonConfigurablePropertyIn( value, property )][@stdlib/assert/is-nonconfigurable-property-in]: test if an object's own or inherited property is non-configurable.
[isNonConfigurableProperty( value, property )][@stdlib/assert/is-nonconfigurable-property]: test if an object's own property is non-configurable.
[isNonEnumerablePropertyIn( value, property )][@stdlib/assert/is-nonenumerable-property-in]: test if an object's own or inherited property is non-enumerable.
[isNonEnumerableProperty( value, property )][@stdlib/assert/is-nonenumerable-property]: test if an object's own property is non-enumerable.
[isObjectLike( value )][@stdlib/assert/is-object-like]: test if a value is object-like.
[isOdd( value )][@stdlib/assert/is-odd]: test if a value is an odd number.
[isPascalcase( value )][@stdlib/assert/is-pascalcase]: test if a value is a string in Pascal case.
[isPlainObject( value )][@stdlib/assert/is-plain-object]: test if a value is a plain object.
[isPositiveZero( value )][@stdlib/assert/is-positive-zero]: test if a value is a number equal to positive zero.
[isPrime( value )][@stdlib/assert/is-prime]: test if a value is a prime number.
[isPrimitive( value )][@stdlib/assert/is-primitive]: test if a value is a JavaScript primitive.
[isPRNGLike( value )][@stdlib/assert/is-prng-like]: test if a value is PRNG-like.
[isProbability( value )][@stdlib/assert/is-probability]: test if a value is a probability.
[isPropertyKey( value )][@stdlib/assert/is-property-key]: test whether a value is a property key.
[isPrototypeOf( obj, prototype )][@stdlib/assert/is-prototype-of]: test if an object's prototype chain contains a provided prototype.
[isReadOnlyPropertyIn( value, property )][@stdlib/assert/is-read-only-property-in]: test if an object's own or inherited property is read-only.
[isReadOnlyProperty( value, property )][@stdlib/assert/is-read-only-property]: test if an object's own property is read-only.
[isReadWritePropertyIn( value, property )][@stdlib/assert/is-read-write-property-in]: test if an object's own or inherited property is readable and writable.
[isReadWriteProperty( value, property )][@stdlib/assert/is-read-write-property]: test if an object's own property is readable and writable.
[isReadablePropertyIn( value, property )][@stdlib/assert/is-readable-property-in]: test if an object's own or inherited property is readable.
[isReadableProperty( value, property )][@stdlib/assert/is-readable-property]: test if an object's own property is readable.
[isRegExpString( value )][@stdlib/assert/is-regexp-string]: test if a value is a regular expression string.
[isRelativePath( value )][@stdlib/assert/is-relative-path]: test if a value is a relative path.
[isRelativeURI( value )][@stdlib/assert/is-relative-uri]: test whether a value is a relative URI.
[isSameComplex128( v1, v2 )][@stdlib/assert/is-same-complex128]: test if two arguments are both double-precision complex floating-point numbers and have the same value.
[isSameComplex64( v1, v2 )][@stdlib/assert/is-same-complex64]: test if two arguments are both single-precision complex floating-point numbers and have the same value.
[isSameNativeClass( a, b )][@stdlib/assert/is-same-native-class]: test if two arguments have the same native class.
[isSameType( a, b )][@stdlib/assert/is-same-type]: test if two arguments have the same type.
[isSameValueZero( a, b )][@stdlib/assert/is-same-value-zero]: test if two arguments are the same value.
[isSameValue( a, b )][@stdlib/assert/is-same-value]: test if two arguments are the same value.
[isSemVer( value )][@stdlib/assert/is-semver]: test if a value is a semantic version string.
[isSlice( value )][@stdlib/assert/is-slice]

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Assert

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assert

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