puppeteer-core/lib/puppeteer/node-env-setup.js

A high-level API to control headless Chrome over the DevTools Protocol

/**
 * @license
 * Copyright 2026 Google Inc.
 * SPDX-License-Identifier: Apache-2.0
 */
import fs from 'node:fs';
import path from 'node:path';
import { debuglog } from 'node:util';
import { environment } from './environment.js';
const READ_NOFOLLOW_FLAGS = fs.constants.O_RDONLY | fs.constants.O_NOFOLLOW;
const WRITE_NOFOLLOW_FLAGS = fs.constants.O_WRONLY |
    fs.constants.O_CREAT |
    fs.constants.O_TRUNC |
    fs.constants.O_NOFOLLOW;
const WRITE_NOFOLLOW_NOOVERWRITE_FLAGS = fs.constants.O_WRONLY |
    fs.constants.O_CREAT |
    fs.constants.O_EXCL |
    fs.constants.O_NOFOLLOW;
const WRITE_NOOVERWRITE_FLAGS = fs.constants.O_WRONLY | fs.constants.O_CREAT | fs.constants.O_EXCL;
const WRITE_NOFOLLOW_MODE = 0o600;
async function readFile(path, encoding) {
    if (!environment.value.followSymlinks &&
        fs.constants.O_NOFOLLOW !== undefined) {
        return await fs.promises.readFile(path, {
            encoding,
            flag: READ_NOFOLLOW_FLAGS,
        });
    }
    return await fs.promises.readFile(path, { encoding });
}
environment.value = {
    path,
    debuglog,
    ScreenRecorder: environment.value.ScreenRecorder,
    followSymlinks: true,
    readFile,
    writeFile: async (filePath, data) => {
        if (!environment.value.followSymlinks &&
            fs.constants.O_NOFOLLOW !== undefined) {
            await fs.promises.writeFile(filePath, data, {
                flag: WRITE_NOFOLLOW_FLAGS,
                mode: WRITE_NOFOLLOW_MODE,
            });
        }
        else {
            await fs.promises.writeFile(filePath, data);
        }
    },
    openFileForWriting: async (filePath) => {
        if (!environment.value.followSymlinks &&
            fs.constants.O_NOFOLLOW !== undefined) {
            return await fs.promises.open(filePath, WRITE_NOFOLLOW_FLAGS, WRITE_NOFOLLOW_MODE);
        }
        return await fs.promises.open(filePath, 'w+');
    },
    createWriteStream: (filePath, options) => {
        const encoding = options?.encoding;
        const overwrite = options?.overwrite ?? true;
        if (!environment.value.followSymlinks &&
            fs.constants.O_NOFOLLOW !== undefined) {
            const flags = overwrite
                ? WRITE_NOFOLLOW_FLAGS
                : WRITE_NOFOLLOW_NOOVERWRITE_FLAGS;
            const fd = fs.openSync(filePath, flags, WRITE_NOFOLLOW_MODE);
            return fs.createWriteStream('', {
                fd,
                mode: WRITE_NOFOLLOW_MODE,
                encoding,
            });
        }
        if (!overwrite) {
            const fd = fs.openSync(filePath, WRITE_NOOVERWRITE_FLAGS);
            return fs.createWriteStream('', {
                fd,
                encoding,
            });
        }
        return fs.createWriteStream(filePath, encoding ? { encoding } : undefined);
    },
    mkdir: async (dirPath, options) => {
        await fs.promises.mkdir(dirPath, options);
    },
};
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