MERN deployment on Heroku

Rahul — Tue, 19 Oct 2021 08:35:42 +0000

Webpack React TypeScript ESLint

Rahul — Sat, 09 Oct 2021 06:53:50 +0000

Initialize project.

npm init -y

create folder src and build.
Add files index.html file into the src folder.
Add dependency

npm install react react-dom

Add dev dependency

npm install --save-dev typescript @types/react 
@types/react-dom @babel/core @babel/preset-env 
@babel/preset-react @babel/preset-typescript 
@babel/plugin-transform-runtime @babel/runtime 
eslint eslint-plugin-react eslint-plugin-react-hooks 
@typescript-eslint/parser @typescript-eslint/eslint-plugin 
webpack webpack-cli webpack-dev-server 
@types/webpack-dev-server babel-loader html-webpack-plugin 
ts-node fork-ts-checker-webpack-plugin 
@types/fork-ts-checker-webpack-plugin eslint-webpack-plugin 
clean-webpack-plugin

Add tsconfig.json in root folder

{
  "compilerOptions": {
    "lib": ["dom", "dom.iterable", "esnext"],
    "allowJs": true,
    "allowSyntheticDefaultImports": true,
    "skipLibCheck": true,
    "esModuleInterop": true,
    "strict": true,
    "forceConsistentCasingInFileNames": true,
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": true,
    "jsx": "react"
  },
  "include": ["src"]
}

Add index.tsx file in the src folder

import React from "react";
import ReactDOM from "react-dom";

const App = () => (
  <h1>My React and TypeScript App!</h1>
);

ReactDOM.render(
  <React.StrictMode>
    <App />
  </React.StrictMode>,
  document.getElementById("root")
);

Add .babelrc in root folder

{
  "presets": [
    "@babel/preset-env",
    "@babel/preset-react",
    "@babel/preset-typescript"
  ],
  "plugins": [
    [
      "@babel/plugin-transform-runtime",
      {
        "regenerator": true
      }
    ]
  ]
}

Add .eslintrc.json in root folder

{
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "ecmaVersion": 2018,
    "sourceType": "module"
  },
  "plugins": [
    "@typescript-eslint",
    "react-hooks"
  ],
  "extends": [
    "plugin:react/recommended",
    "plugin:@typescript-eslint/recommended"
  ],
  "rules": {
    "react-hooks/rules-of-hooks": "error",
    "react-hooks/exhaustive-deps": "warn",
    "react/prop-types": "off"
  },
  "settings": {
    "react": {
      "pragma": "React",
      "version": "detect"
    }
  }
}

Add webpack.dev.config.ts in root folder

import path from "path";
import { Configuration, HotModuleReplacementPlugin } from "webpack";
import HtmlWebpackPlugin from "html-webpack-plugin";
import ForkTsCheckerWebpackPlugin from 'fork-ts-checker-webpack-plugin';
import ESLintPlugin from "eslint-webpack-plugin";

const config: Configuration = {
  mode: "development",
  output: {
    publicPath: "/",
  },
  entry: "./src/index.tsx",
  module: {
    rules: [
      {
        test: /\.(ts|js)x?$/i,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader",
          options: {
            presets: [
              "@babel/preset-env",
              "@babel/preset-react",
              "@babel/preset-typescript",
            ],
          },
        },
      },
    ],
  },
  resolve: {
    extensions: [".tsx", ".ts", ".js"],
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: "src/index.html",
    }),
new ForkTsCheckerWebpackPlugin({
      async: false
    }),
new ESLintPlugin({
      extensions: ["js", "jsx", "ts", "tsx"],
    }),
    new HotModuleReplacementPlugin(),
  ],
  devtool: "inline-source-map",
  devServer: {
    static: path.join(__dirname, "build"),
    historyApiFallback: true,
    port: 4000,
    open: true,
    hot: true
  },
};

export default config;

Add webpack.prod.config.ts in root folder

import path from "path";
import { Configuration } from "webpack";
import HtmlWebpackPlugin from "html-webpack-plugin";
import ForkTsCheckerWebpackPlugin from "fork-ts-checker-webpack-plugin";
import ESLintPlugin from "eslint-webpack-plugin";
import { CleanWebpackPlugin } from "clean-webpack-plugin";

const config: Configuration = {
  mode: "production",
  entry: "./src/index.tsx",
  output: {
    path: path.resolve(__dirname, "build"),
    filename: "[name].[contenthash].js",
    publicPath: "",
  },
  module: {
    rules: [
      {
        test: /\.(ts|js)x?$/i,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader",
          options: {
            presets: [
              "@babel/preset-env",
              "@babel/preset-react",
              "@babel/preset-typescript",
            ],
          },
        },
      },
    ],
  },
  resolve: {
    extensions: [".tsx", ".ts", ".js"],
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: "src/index.html",
    }),
    new ForkTsCheckerWebpackPlugin({
      async: false,
    }),
    new ESLintPlugin({
      extensions: ["js", "jsx", "ts", "tsx"],
    }),
    new CleanWebpackPlugin(),
  ],
};

export default config;

Update package.json

"scripts": {
    "start": "webpack serve --config webpack.dev.config.ts",
    "build": "webpack --config webpack.prod.config.ts",
  },

DEV Community: Rahul

MERN deployment on Heroku

Webpack React TypeScript ESLint