tsconfig.json

{
    "compilerOptions": {
      // Ensure that .d.ts files are created by tsc, but not .js files
      "declaration": true,
      "allowSyntheticDefaultImports": true,
      "allowJs": true,
      // Ensure that Babel can safely transpile files in the TypeScript project
      "isolatedModules": true,
      "strict": true,
      "strictNullChecks": true,// ask Romain 
      "module": "ESNEXT",
      "target": "ESNEXT",
      "lib": [
        "ES2020"
      ],
      "noEmit": true,
      "moduleResolution": "node",
      "skipLibCheck": true,
      "noImplicitAny": false,
      "noImplicitReturns": false, // fixe Not all code paths return a value.ts(7030) ==> handleLogin()
      "noEmitOnError": true,
      "esModuleInterop": true, 
      "outDir": "./dist",
    },
    "baseUrl": ".",
    "include": [
        "src/**/*.ts",
        "src/**/*.js"
    ],
    "exclude": [
      "node_modules/**/*",
      "dist/**/*"
    ]
  }