Transform aws-sam & create-react-app codes from JavaScript to TypeScript

config-overrides.js

const fs = require('fs')
const path = require('path')

const appDirectory = fs.realpathSync(process.cwd())
const resolveApp = relativePath => path.resolve(appDirectory, relativePath)

module.exports = {
  webpack: (config, env) => ({
    ...config,
    entry: [resolveApp('src/server.ts')],
    target: 'node',
    output: {
      ...config.output,
      filename: 'index.js',
      libraryTarget: 'commonjs'
    }
  })
}

package.json

{
  "name": "example",
  "version": "0.1.0",
  "private": true,
  "homepage": "https://example.com",
  "proxy": "http://localhost:3001",
  "dependencies": {
    "aws-serverless-express": "^3.2.0",
    "express": "^4.16.3",
    "react": "^16.3.2",
    "react-dom": "^16.3.2",
    "react-scripts-ts": "2.16.0"
  },
  "scripts": {
    "start": "run-p start:aws start:cra",
    "start:aws": "sam local start-api -p 3001 --static-dir server",
    "start:cra": "react-scripts-ts start",
    "build": "run-s clear build:aws move:aws build:cra move:cra",
    "build:aws": "react-app-rewired build --scripts-version react-scripts-ts",
    "build:cra": "react-scripts-ts build",
    "clear": "run-p clear:aws clear:cra",
    "clear:aws": "rm -rf server",
    "clear:cra": "rm -rf client",
    "move:aws":
      "mv -f build server && find ./server -type f -not -name 'index.js*' -exec rm {} \\;",
    "move:cra": "mv -f build client",
    "test": "run-p test:aws test:cra",
    "test:aws":
      "react-app-rewired test --scripts-version react-scripts-ts --env=jsdom",
    "test:cra": "react-scripts-ts test --env=jsdom",
    "lint": "tslint --project tsconfig.json",
    "format": "tslint --project tsconfig.json --fix",
    "eject": "react-scripts-ts eject"
  },
  "devDependencies": {
    "@types/aws-serverless-express": "^3.0.1",
    "@types/express": "^4.11.1",
    "@types/jest": "^22.2.3",
    "@types/node": "^10.1.2",
    "@types/react": "^16.3.14",
    "@types/react-dom": "^16.0.5",
    "@types/supertest": "^2.0.4",
    "eslint": "^4.19.1",
    "eslint-config-airbnb": "^16.1.0",
    "eslint-config-prettier": "^2.9.0",
    "eslint-config-standard": "^11.0.0",
    "eslint-plugin-import": "^2.12.0",
    "eslint-plugin-jsx-a11y": "^6.0.3",
    "eslint-plugin-mocha": "^5.0.0",
    "eslint-plugin-node": "^6.0.1",
    "eslint-plugin-prettier": "^2.6.0",
    "eslint-plugin-promise": "^3.7.0",
    "eslint-plugin-react": "^7.8.2",
    "eslint-plugin-standard": "^3.1.0",
    "npm-run-all": "^4.1.3",
    "prettier": "^1.12.1",
    "react-app-rewired": "^1.5.2",
    "supertest": "^3.1.0",
    "tslint": "^5.10.0",
    "tslint-config-airbnb": "^5.9.2",
    "tslint-config-prettier": "^1.13.0",
    "tslint-config-standard": "^7.0.0",
    "tslint-language-service": "^0.9.9",
    "tslint-plugin-prettier": "^1.3.0",
    "tslint-react": "^3.6.0",
    "typescript": "^2.8.3"
  }
}