running tsc in expo project with husky via lint-staged keeps generating js files

Question

I have an expo project that uses typescript, originally generated via

expo init myApp --template @native-base/expo-template-typescript

I added husky and have a lint staged definition that simply says this:

  "lint-staged": {
    "*.{js,jsx}": [
      "eslint --cache --fix"
    ],
    "*.{ts,tsx}": [
      "tsc --project tsconfig.json",
      "eslint --cache --fix"
    ]
  },

When tsc runs via the pre-commit hook this way it incorrectly checks the node_modules files, and also generates.js files of all the.tsx files that were checked in my src dir. However, running the following simple package.json command via yarn lint does not do those incorrect actions

  "scripts": {
    ...
    "lint": "eslint './src/**/*{js,ts,jsx,tsx}' --fix && tsc",
    ...
  },

Answer 1

Fix

Add --noEmit to prevent JavaScript from being generated.

More

  "scripts": {
    ...
    "lint": "eslint './src/**/*{js,ts,jsx,tsx}' --fix && tsc --noEmit",
    ...
  },

Perhaps this is already setup by the tsconfig.json so --project tsconfig.json might also work:

   "scripts": {
    ...
    "lint": "eslint './src/**/*{js,ts,jsx,tsx}' --fix && tsc --project tsconfig.json",
    ...
   },