DevCrev Base Project: TypeScript, VS Code, ESLint

How this project was made:

I am using VS Code with the ESLint (by Dirk Baeumer) extension installed.

I already have Node.js/NPM installed on my Linux machine.

I do not have TypeScript installed globally but I will install it locally to the project.

I do not have ESLint installed globally but I will install it locally to the project.

Let's get started.

Start from a directory where you want create the project folder.

Make a project directory.

$ mkdir typescript-eslint-hello

Change into that directory.

$ cd typescript-eslint-hello/

Initialize the project.

$ npm init -y

Install TypeScript.

$ npm install --save-dev typescript

Install ESLint.

$ npm install --save-dev eslint

Configure ESLint.

$ ./node_modules/.bin/eslint --init

• Questions and answers while configuring ESLint:
  • How would you like to use ESLint?
    • To check syntax and find problems
  • What type of modules does your project use?
    • CommonJS
  • Which framework does your project use?
    • None of these
  • Does your project use TypeScript?
    • Yes
  • Where does your code run?
    • Browser
  • What format do you want your config file to be in?
    • JSON
  • Would you like to install them now with npm?
    • Yes

Launch VS Code.

$ code .

Edit package.json and replace the scripts section with what is committed in this repository.

Add app.ts and populate it with what is in the repository.

Edit .eslintrc.json

• Change the env > "es2021" key to "es2020". The value remains true.
• Change the parserOptions > "ecmaVersion" value from 12 to 11.
• I suspect the above two changes will not be needed after a future update of the VS Code ESlint extension.
• Replace the empty rules section with what is committed in this repository.

Save all files.

For app.ts (opened in editor) you should see red error indicators for missing semicolons and a yellow warning indicator for the use of the console method.

For the npm scripts:

• $ npm run lint
  • Will lint all .ts files
• $ npm run build
  • Will build app.js from app.ts