internals/helpers.js

import isObjectLike from '../isObjectLike';
import getTag from './getTag';
import { argumentsTag, functionProtoToString, stringUndefined } from './native';
/**
 * ut2 版本号。
 *
 * @static
 * @since 1.0.0
 */
export const VERSION = BUILD_VERSION;
/**
 * 当前运行环境是否为浏览器
 *
 * @static
 * @since 1.10.0
 */
export const isBrowser = typeof window !== stringUndefined && isObjectLike(window) && typeof document !== stringUndefined && isObjectLike(document) && window.document === document;
// @ts-ignore
export const supportedArgumentsType = getTag((() => arguments)()) === argumentsTag;
export const FUNC_ERROR_TEXT = 'Expected a function';
export function toSource(func) {
    if (func !== null) {
        try {
            return functionProtoToString.call(func);
        }
        catch (e) {
            /* empty */
        }
        try {
            return func + '';
        }
        catch (e) {
            /* empty */
        }
    }
    return '';
}
export const stubFlase = () => false;
export const stubTrue = () => true;