How to make create-react-app auto build?

问题:

I have been using create react app for a while. 'npm start' or 'yarn start' autoreloads works fine by itself but now I have an another problem. Currently I run the app on express server through the build folder, and I use 'npm run build' since express is serving the built files. There are many api calls which requires the app to be ran through this way. Now it become tedious to manually do 'npm run build' every time. Is there a simple way or work around to build automatically just like 'npm start' without eject the app(I know could eject and configure webpack to do that, but i don't want to go down that path)? Thanks

回答1:

Unfortunately this is something you will have to do yourself. You can use a tool like npm-watch to accomplish what you want though:

Install npm-watch

npm i --save-dev npm-watch

package.json

{
  "name": "react-app",
  "version": "0.1.0",
  "private": false,
  "devDependencies": {
    "npm-watch": "^0.1.8",
    "react-scripts": "0.9.5",
  },
  "dependencies": {
    "react": "^15.4.2",
    "react-dom": "^15.4.2"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test --env=jsdom",
    "eject": "react-scripts eject",
    "watch": "npm-watch"
  },
  "watch": {
    "build": "src/"
  }
}

Afterwards, just use npm run watch to start up npm-watch so it can rebuild your assets on changes.

回答2:

While this doesn’t really answer your question, you shouldn’t be using npm run build in development. Not only the rebuilds are slow, but it also skips important React warnings for performance and size, so you’ll end up scratching your head more and getting a lot less details in the warnings.

If you just need to do API requests with Express, use the proxy feature which lets you proxy API requests from npm start to your server. There is also a tutorial with a matching repository demonstrating how to do that.

In production, of course, you should use the build produced by npm run build. But you would only need to run it before deployment.

回答3:

Run your backend on a different port. If your running on express modify the file bin/www

var port = process.env.PORT || 9000

and in your /src folder create a config file where you configure your api host,routes, params etc

//config/index.js
export const Config = {
   protocol: 'http',
   host: window.location.hostname, //or the environment variable
   params: '/api/',
   api: {post:'/posts/'}
}

and in your calling component or where ever your calling the api's

import {Config} from '../config'

axios.get(`${Config.protocol}${Config.host}${Config.params}${Config.api.posts}${some id i guess}`)

回答4:

i am also using create react app, this is how i modified my scripts to run project for development(windows), build the production build and run the production build.

"scripts": {
    "start": "set PORT=8080 && react-scripts start",
    "build": "react-scripts build",
    "deploy": "set PORT=8008 && serve -s build"
  }

npm start : run project for development(windows) npm run-script build : build the production build npm run-script deploy: run the production build

• npm install -g serve before run npm run-script deploy.