Converting a React Typescript project to Javascript ES5: A step-by-step guide

I have a react typescript project and I need to convert the source code (NOT THE BUILD) to ES3 or ES5 JavaScript. This is because I want to use this code as a component in another React app.

Can you suggest which preset and plugins I should use for this task?

I have experimented with the following babel presets and plugins:

 "presets": [
  "@babel/preset-env",
  "@babel/preset-react",
  "@babel/preset-typescript",
  "@babel/preset-flow"
],
"plugins": [
  "@babel/plugin-proposal-class-properties",
  "@babel/plugin-proposal-optional-chaining",
  "@babel/plugin-transform-typescript"
],

In the past, my project was plain ReactJs without Typescript and back then, I was able to transpile using the following combination:

 "presets": [
  "@babel/preset-react"
],
"plugins": [
  "@babel/plugin-proposal-class-properties",
  "@babel/plugin-proposal-optional-chaining",
],

Requesting help on how to convert ReactJs + Typescript source code to es3/es5 JavaScript.

typescriptbabeljscreate-react-appreact-typescript

Answer №1

My task involves transforming the original source code (NOT THE BUILD) into ES3 or ES5 Js.

If you are considering Upgrading the source to TypeScript, it is recommended to do so gradually by hand. However, it's worth noting that ES3 is actually valid TypeScript! To allow TypeScript to work with .js files, you can enable the allowJs compiler option in tsconfig.json. For more information on the allowJs option, refer to the official documentation here: https://www.typescriptlang.org/tsconfig#allowJs

If your goal is to compile TypeScript to JavaScript, using 

"@babel/preset-typescript"
is the solution you need. For additional customization, consider utilizing options based on target specifications: https://babeljs.io/docs/en/babel-preset-env#targets

Answer №2

My current method for making a quick turnaround involves simply renaming App.tsx to App.js and inserting custom Javascript code into App.js

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