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// ==========================================================================
// Type checking utils
// ==========================================================================
const getConstructor = (input) => (input !== null && typeof input !== 'undefined' ? input.constructor : null);
const instanceOf = (input, constructor) => Boolean(input && constructor && input instanceof constructor);
const isNullOrUndefined = (input) => input === null || typeof input === 'undefined';
const isObject = (input) => getConstructor(input) === Object;
const isNumber = (input) => getConstructor(input) === Number && !Number.isNaN(input);
const isString = (input) => getConstructor(input) === String;
const isBoolean = (input) => getConstructor(input) === Boolean;
const isFunction = (input) => getConstructor(input) === Function;
const isArray = (input) => Array.isArray(input);
const isWeakMap = (input) => instanceOf(input, WeakMap);
const isNodeList = (input) => instanceOf(input, NodeList);
const isTextNode = (input) => getConstructor(input) === Text;
const isEvent = (input) => instanceOf(input, Event);
const isKeyboardEvent = (input) => instanceOf(input, KeyboardEvent);
const isCue = (input) => instanceOf(input, window.TextTrackCue) || instanceOf(input, window.VTTCue);
const isTrack = (input) => instanceOf(input, TextTrack) || (!isNullOrUndefined(input) && isString(input.kind));
const isPromise = (input) => instanceOf(input, Promise) && isFunction(input.then);
const isElement = (input) =>
input !== null &&
(typeof input === "object") &&
(input.nodeType === 1) &&
(typeof input.style === "object") &&
(typeof input.ownerDocument === "object");
const isEmpty = (input) =>
isNullOrUndefined(input) ||
((isString(input) || isArray(input) || isNodeList(input)) && !input.length) ||
(isObject(input) && !Object.keys(input).length);
const isUrl = (input) => {
// Accept a URL object
if (instanceOf(input, window.URL)) {
return true;
}
// Must be string from here
if (!isString(input)) {
return false;
}
// Add the protocol if required
let string = input;
if (!input.startsWith('http://') || !input.startsWith('https://')) {
string = `http://${input}`;
}
try {
return !isEmpty(new URL(string).hostname);
} catch (e) {
return false;
}
};
export default {
nullOrUndefined: isNullOrUndefined,
object: isObject,
number: isNumber,
string: isString,
boolean: isBoolean,
function: isFunction,
array: isArray,
weakMap: isWeakMap,
nodeList: isNodeList,
element: isElement,
textNode: isTextNode,
event: isEvent,
keyboardEvent: isKeyboardEvent,
cue: isCue,
track: isTrack,
promise: isPromise,
url: isUrl,
empty: isEmpty,
};
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