is-what/dist/index.js

/**
 * Returns the object type of the given payload
 *
 * @param {*} payload
 * @returns {string}
 */
function getType(payload) {
    return Object.prototype.toString.call(payload).slice(8, -1);
}
/**
 * Returns whether the payload is undefined
 *
 * @param {*} payload
 * @returns {payload is undefined}
 */
function isUndefined(payload) {
    return getType(payload) === 'Undefined';
}
/**
 * Returns whether the payload is null
 *
 * @param {*} payload
 * @returns {payload is null}
 */
function isNull(payload) {
    return getType(payload) === 'Null';
}
/**
 * Returns whether the payload is a plain JavaScript object (excluding special classes or objects with other prototypes)
 *
 * @param {*} payload
 * @returns {payload is PlainObject}
 */
function isPlainObject(payload) {
    if (getType(payload) !== 'Object')
        return false;
    return payload.constructor === Object && Object.getPrototypeOf(payload) === Object.prototype;
}
/**
 * Returns whether the payload is a plain JavaScript object (excluding special classes or objects with other prototypes)
 *
 * @param {*} payload
 * @returns {payload is PlainObject}
 */
function isObject(payload) {
    return isPlainObject(payload);
}
/**
 * Returns whether the payload is a an empty object (excluding special classes or objects with other prototypes)
 *
 * @param {*} payload
 * @returns {payload is { [K in any]: never }}
 */
function isEmptyObject(payload) {
    return isPlainObject(payload) && Object.keys(payload).length === 0;
}
/**
 * Returns whether the payload is a an empty object (excluding special classes or objects with other prototypes)
 *
 * @param {*} payload
 * @returns {payload is PlainObject}
 */
function isFullObject(payload) {
    return isPlainObject(payload) && Object.keys(payload).length > 0;
}
/**
 * Returns whether the payload is an any kind of object (including special classes or objects with different prototypes)
 *
 * @param {*} payload
 * @returns {payload is PlainObject}
 */
function isAnyObject(payload) {
    return getType(payload) === 'Object';
}
/**
 * Returns whether the payload is an object like a type passed in < >
 *
 * Usage: isObjectLike<{id: any}>(payload) // will make sure it's an object and has an `id` prop.
 *
 * @template T this must be passed in < >
 * @param {*} payload
 * @returns {payload is T}
 */
function isObjectLike(payload) {
    return isAnyObject(payload);
}
/**
 * Returns whether the payload is a function (regular or async)
 *
 * @param {*} payload
 * @returns {payload is AnyFunction}
 */
function isFunction(payload) {
    return typeof payload === 'function';
}
/**
 * Returns whether the payload is an array
 *
 * @param {any} payload
 * @returns {payload is any[]}
 */
function isArray(payload) {
    return getType(payload) === 'Array';
}
/**
 * Returns whether the payload is a an array with at least 1 item
 *
 * @param {*} payload
 * @returns {payload is any[]}
 */
function isFullArray(payload) {
    return isArray(payload) && payload.length > 0;
}
/**
 * Returns whether the payload is a an empty array
 *
 * @param {*} payload
 * @returns {payload is []}
 */
function isEmptyArray(payload) {
    return isArray(payload) && payload.length === 0;
}
/**
 * Returns whether the payload is a string
 *
 * @param {*} payload
 * @returns {payload is string}
 */
function isString(payload) {
    return getType(payload) === 'String';
}
/**
 * Returns whether the payload is a string, BUT returns false for ''
 *
 * @param {*} payload
 * @returns {payload is string}
 */
function isFullString(payload) {
    return isString(payload) && payload !== '';
}
/**
 * Returns whether the payload is ''
 *
 * @param {*} payload
 * @returns {payload is string}
 */
function isEmptyString(payload) {
    return payload === '';
}
/**
 * Returns whether the payload is a number (but not NaN)
 *
 * This will return `false` for `NaN`!!
 *
 * @param {*} payload
 * @returns {payload is number}
 */
function isNumber(payload) {
    return getType(payload) === 'Number' && !isNaN(payload);
}
/**
 * Returns whether the payload is a positive number (but not 0)
 *
 * @param {*} payload
 * @returns {payload is number}
 */
function isPositiveNumber(payload) {
    return isNumber(payload) && payload > 0;
}
/**
 * Returns whether the payload is a negative number (but not 0)
 *
 * @param {*} payload
 * @returns {payload is number}
 */
function isNegativeNumber(payload) {
    return isNumber(payload) && payload < 0;
}
/**
 * Returns whether the payload is a boolean
 *
 * @param {*} payload
 * @returns {payload is boolean}
 */
function isBoolean(payload) {
    return getType(payload) === 'Boolean';
}
/**
 * Returns whether the payload is a regular expression (RegExp)
 *
 * @param {*} payload
 * @returns {payload is RegExp}
 */
function isRegExp(payload) {
    return getType(payload) === 'RegExp';
}
/**
 * Returns whether the payload is a Map
 *
 * @param {*} payload
 * @returns {payload is Map<any, any>}
 */
function isMap(payload) {
    return getType(payload) === 'Map';
}
/**
 * Returns whether the payload is a WeakMap
 *
 * @param {*} payload
 * @returns {payload is WeakMap<any, any>}
 */
function isWeakMap(payload) {
    return getType(payload) === 'WeakMap';
}
/**
 * Returns whether the payload is a Set
 *
 * @param {*} payload
 * @returns {payload is Set<any>}
 */
function isSet(payload) {
    return getType(payload) === 'Set';
}
/**
 * Returns whether the payload is a WeakSet
 *
 * @param {*} payload
 * @returns {payload is WeakSet<any>}
 */
function isWeakSet(payload) {
    return getType(payload) === 'WeakSet';
}
/**
 * Returns whether the payload is a Symbol
 *
 * @param {*} payload
 * @returns {payload is symbol}
 */
function isSymbol(payload) {
    return getType(payload) === 'Symbol';
}
/**
 * Returns whether the payload is a Date, and that the date is valid
 *
 * @param {*} payload
 * @returns {payload is Date}
 */
function isDate(payload) {
    return getType(payload) === 'Date' && !isNaN(payload);
}
/**
 * Returns whether the payload is a Blob
 *
 * @param {*} payload
 * @returns {payload is Blob}
 */
function isBlob(payload) {
    return getType(payload) === 'Blob';
}
/**
 * Returns whether the payload is a File
 *
 * @param {*} payload
 * @returns {payload is File}
 */
function isFile(payload) {
    return getType(payload) === 'File';
}
/**
 * Returns whether the payload is a Promise
 *
 * @param {*} payload
 * @returns {payload is Promise<any>}
 */
function isPromise(payload) {
    return getType(payload) === 'Promise';
}
/**
 * Returns whether the payload is an Error
 *
 * @param {*} payload
 * @returns {payload is Error}
 */
function isError(payload) {
    return getType(payload) === 'Error';
}
/**
 * Returns whether the payload is literally the value `NaN` (it's `NaN` and also a `number`)
 *
 * @param {*} payload
 * @returns {payload is typeof NaN}
 */
function isNaNValue(payload) {
    return getType(payload) === 'Number' && isNaN(payload);
}
/**
 * Returns whether the payload is a primitive type (eg. Boolean | Null | Undefined | Number | String | Symbol)
 *
 * @param {*} payload
 * @returns {(payload is boolean | null | undefined | number | string | symbol)}
 */
function isPrimitive(payload) {
    return (isBoolean(payload) ||
        isNull(payload) ||
        isUndefined(payload) ||
        isNumber(payload) ||
        isString(payload) ||
        isSymbol(payload));
}
/**
 * Returns true whether the payload is null or undefined
 *
 * @param {*} payload
 * @returns {(payload is null | undefined)}
 */
const isNullOrUndefined = isOneOf(isNull, isUndefined);
function isOneOf(a, b, c, d, e) {
    return (value) => a(value) || b(value) || (!!c && c(value)) || (!!d && d(value)) || (!!e && e(value));
}
/**
 * Does a generic check to check that the given payload is of a given type.
 * In cases like Number, it will return true for NaN as NaN is a Number (thanks javascript!);
 * It will, however, differentiate between object and null
 *
 * @template T
 * @param {*} payload
 * @param {T} type
 * @throws {TypeError} Will throw type error if type is an invalid type
 * @returns {payload is T}
 */
function isType(payload, type) {
    if (!(type instanceof Function)) {
        throw new TypeError('Type must be a function');
    }
    if (!Object.prototype.hasOwnProperty.call(type, 'prototype')) {
        throw new TypeError('Type is not a class');
    }
    // Classes usually have names (as functions usually have names)
    const name = type.name;
    return getType(payload) === name || Boolean(payload && payload.constructor === type);
}

export { getType, isAnyObject, isArray, isBlob, isBoolean, isDate, isEmptyArray, isEmptyObject, isEmptyString, isError, isFile, isFullArray, isFullObject, isFullString, isFunction, isMap, isNaNValue, isNegativeNumber, isNull, isNullOrUndefined, isNumber, isObject, isObjectLike, isOneOf, isPlainObject, isPositiveNumber, isPrimitive, isPromise, isRegExp, isSet, isString, isSymbol, isType, isUndefined, isWeakMap, isWeakSet };