(node:63185) UnhandledPromiseRejectionWarning: Error: Failed to launch the browser process! spawn /Users/chennan/xxxx/crawler-core/webapp/node_modules/puppeteer-core/.local-chromium/mac-818858/chrome-mac/Chromium.app/Contents/MacOS/Chromium ENOENT
TROUBLESHOOTING: https://github.com/puppeteer/puppeteer/blob/main/docs/troubleshooting.md
at onClose (/Users/chennan/xxxx/crawler-core/webapp/node_modules/puppeteer-core/lib/cjs/puppeteer/node/BrowserRunner.js:193:20)
at ChildProcess.<anonymous> (/Users/chennan/xxxx/crawler-core/webapp/node_modules/puppeteer-core/lib/cjs/puppeteer/node/BrowserRunner.js:185:85)
at ChildProcess.emit (events.js:315:20)
at Process.ChildProcess._handle.onexit (internal/child_process.js:275:12)
at onErrorNT (internal/child_process.js:465:16)
at processTicksAndRejections (internal/process/task_queues.js:80:21)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:63185) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:63185) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
问题原因，没有在默认路径下找到Chromium。
解决步骤:
断点调试
跟踪到文件
/node_modules/puppeteer-core/lib/cjs/puppeteer/node/BrowserFetcher.js
找到这一行
const outputPath = this._getFolderPath(revision);
打印输出outputPath，结果为
/Users/chennan/xxxx/crawler-core/webapp/node_modules/puppeteer-core/.local-chromium/mac-818858
再结合程序报道那个错误，其中给出了完整的路径
/Users/chennan/xxxx/crawler-core/webapp/node_modules/puppeteer-core/.local-chromium/mac-818858/chrome-mac/Chromium.app/Contents/MacOS/Chromium
可以发现.local-chromium往后就没有东西了。所以程序找不到是理所当然了。
接下来就是查找chromium到底在什么位置，通过以下代码可以得到它的路径。
const puppeteer = require("puppeteer");
const browserFetcher = puppeteer.createBrowserFetcher();
const run=async ()=>{
const res=await browserFetcher.download("818858") //程序第一次报错会显示这个版本号
console.log(res)
}
run()
得到信息
{
revision: '818858',
executablePath: '/Users/chennan/xxxx/crawler-core/webapp/node_modules/puppeteer/.local-chromium/mac-818858/chrome-mac/Chromium.app/Contents/MacOS/Chromium',
folderPath: '/Users/chennan/xxxx/crawler-core/webapp/node_modules/puppeteer/.local-chromium/mac-818858',
local: true,
url: 'https://storage.googleapis.com/chromium-browser-snapshots/Mac/818858/chrome-mac.zip',
product: 'chrome'
}
通过executablePath就知道了文件的位置。
然后补全之前的路径即可。