ut2/lib/guard.js

一个现代 JavaScript 实用工具库。[点击查看在线文档]。

'use strict';

var native = require('./internals/native.js');
var isPromiseLike = require('./isPromiseLike.js');

var guard = function (fn, shouldGuard) {
    var _guard = function (err) {
        if (shouldGuard && !shouldGuard(err)) {
            throw err;
        }
        return native.nativeUndefined;
    };
    try {
        var result = fn();
        return isPromiseLike(result) ? result.catch(_guard) : result;
    }
    catch (err) {
        return _guard(err);
    }
};

module.exports = guard;