NPM 和 NodeJS 兼容性：NodeJS 在 PM 提示下工作，但不是脚本

Question

I am attempting to get a lighthouse script running in Node.JS (which I am new to). I followed the intial instructions here https://github.com/GoogleChrome/lighthouse/blob/master/docs/readme.md#using-programmatically . I was able to complete the prior steps in the package manager console (Visual Studio 2017):

npm install -g lighthouse
lighthouse https://airhorner.com/
//and
lighthouse https://airhorner.com/ --output=json --output-path=./report/test1.json

However, I do get an initial warning that NPM only supports Node.JS in versions 4 through 8 and recommends a newer version. The problem is I am running Node v12 and NPM v5 - both the latest.

When I create a script version like below (app.js)

const lighthouse = require('lighthouse');
const chromeLauncher = require('chrome-launcher');
const config = {
    extends: 'lighthouse:default',
    settings: {
        emulatedFormFactor: 'desktop',
        onlyCategories: 'performance',
        output: 'json',
        outputPath: './report.json'
    }
};

function launchChromeAndRunLighthouse(url, opts = null, config) {
    return chromeLauncher.launch().then(chrome => {
        opts.port = chrome.port;
        return lighthouse(url, opts, config).then(results => {
            return chrome.kill().then(() => results.lhr);
        });
    });
}

// Usage:
launchChromeAndRunLighthouse('https://airhorner.com/', config).then(results => {
    // Use results!
});

And run the command

C:\src\project> node app.js

I get the error - Cannot find module 'lighthouse'

Answer 1

don't install lighthouse locally use it inside your working dir. first start by running npm init that will create the package.json file inside the current working dir
then npm install --save lighthouse will download it and save it to node_modules now you can use it locally inside your working dir

it should look something like this

• app.js
• package.json
• node_modules/

then run node app.js