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