Use Prettier

[ibc]

Details

• Format .ts and .mjs files using Prettier (proper paths filtered).
• New script added: npm run format:node (plus npm run format which now formats Node and Worker).

Why?

• Because I'm tired of having to revisit tons of files and reformat them.
• Because what I like today may not match what I like tomorrow.
• Because it's not me alone in the project.

Bonus Tracks

• Improve (even fix) .eslintrc.js file. For example, it was not linting npm-scripts.mjs properly.
• Run Jest with --detectOpenHandles (no issues so far).

[ibc]

So about changes in .eslintrc.js:

• It's been moved to root folder since it must also lint worker/scripts/clang-format.mjs.
• It has 3 sectioons:
  1. First section is global to all JavaScript or TypeScript files.
  2. Second section is only about TypeScript files, so it adds typescript-eslint rules.
  3. Third section is only about TypeScripts files in test files, so it adds Jest stuff.
• I added plugin:prettier/recommended in last position of the extends array in eslintrc.js as per documentation.
• I added 'prettier/prettier': 2 in rules to make ESlint fail if some file doesn't adhere to Prettier syntax.
• I added eslint-config-prettier package and call it in npm run lint:node task to ensure that we are not declaring any ESLint rule that is later gonna be overridden by plugin:prettier/recommended rules:

  // Ensure there are no rules that are unnecessary or conflict with Prettier
  // rules.
  executeCmd('eslint-config-prettier .eslintrc.js');