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evaluate-and-return.ts
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evaluate-and-return.ts
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/*
* This file is part of WPPConnect.
*
* WPPConnect is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* WPPConnect is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with WPPConnect. If not, see <https://www.gnu.org/licenses/>.
*/
import { Page } from 'puppeteer';
import {
EvaluateFn,
EvaluateFnReturnType,
SerializableOrJSHandle,
} from '../../types/Evaluate';
//EvaluateFn, EvaluateFnReturnType, SerializableOrJSHandle //
export async function evaluateAndReturn<T extends EvaluateFn>(
page: Page,
pageFunction: T,
...args: SerializableOrJSHandle[]
): Promise<
EvaluateFnReturnType<T> extends PromiseLike<infer U>
? U
: EvaluateFnReturnType<T>
> {
// See https://github.com/puppeteer/puppeteer/blob/41f23beb0da2433cf9103e5d8fc22a03b1820336/src/common/ExecutionContext.ts#L196
let functionText = pageFunction.toString();
try {
new Function('(' + functionText + ')');
} catch (error) {
// This means we might have a function shorthand. Try another
// time prefixing 'function '.
if (functionText.startsWith('async ')) {
functionText =
'async function ' + functionText.substring('async '.length);
} else {
functionText = 'function ' + functionText;
}
try {
new Function('(' + functionText + ')');
} catch (error) {
// We tried hard to serialize, but there's a weird beast here.
throw new Error('Passed function is not well-serializable!');
}
}
/**
* Polyfill async/await and promise converter
* See https://github.com/basarat/typescript-book/blob/master/docs/async-await.md
*/
const func = new Function(`
var __assign = (this && this.__assign) || function () {
__assign = Object.assign || function(t) {
for (var s, i = 1, n = arguments.length; i < n; i++) {
s = arguments[i];
for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
t[p] = s[p];
}
return t;
};
return __assign.apply(this, arguments);
};
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (_) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
var _this; // for arrow function
return new Promise(async (resolve) => {
try {
return resolve(await (${functionText}).apply(this, arguments));
} catch (error) {
return resolve({
__error: JSON.parse(JSON.stringify(error, Object.getOwnPropertyNames(error))),
});
}
});`);
const result = (await page.evaluate(func as any, ...args)) as any;
if (result !== null && typeof result === 'object' && '__error' in result) {
const errorMessage =
result.__error.message || JSON.stringify(result.__error);
const error = new Error(errorMessage);
Object.assign(error, result.__error);
let jsStack = error.stack;
Error.captureStackTrace(error);
if (jsStack) {
error.stack = (error.stack || '') + '\nJS Stack: ' + jsStack;
}
throw error;
}
return result;
}