wishthis/node_modules/is-what/dist/index.esm.js
2022-01-21 09:28:41 +01:00

327 lines
8.3 KiB
JavaScript

/**
* 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 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)}
*/
var isNullOrUndefined = isOneOf(isNull, isUndefined);
function isOneOf(a, b, c, d, e) {
return function (value) {
return 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)
var 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, isNull, isNullOrUndefined, isNumber, isObject, isObjectLike, isOneOf, isPlainObject, isPrimitive, isPromise, isRegExp, isSet, isString, isSymbol, isType, isUndefined, isWeakMap, isWeakSet };