tryit.js

import { nativeUndefined } from './internals/native';
import isPromiseLike from './isPromiseLike';
/**
 * 包装一个函数（支持异步函数），将其转为错误优先函数。
 *
 * @alias module:Util.tryit
 * @since 1.13.0
 * @param {Function} fn 要包装的函数。
 * @returns 如果执行成功返回 `[null, result]`，否则返回 `[Error, undefined]`。
 * @example
 * const getGreet = async (name: string) => {
 *   return 'hello ' + name;
 * }
 * const [err, result] = await tryit(getGreet)('jeff');
 * console.log([err, result]);
 * // [null, 'hello jeff']
 *
 *
 * const errorFn = async (name: string) => {
 *   throw new Error('error message');
 *   return 'hello ' + name;
 * }
 * const [err2, result2] = await tryit(errorFn)('jeff');
 * console.log([err2, result2]);
 * // [Error: error message, undefined]
 */
const tryit = (fn) => {
    return (...args) => {
        try {
            const result = fn(...args);
            if (isPromiseLike(result)) {
                return result
                    .then((res) => {
                    return [null, res];
                })
                    .catch((err) => {
                    return [err, nativeUndefined];
                });
            }
            return [null, result];
        }
        catch (err) {
            return [err, nativeUndefined];
        }
    };
};
export default tryit;