ts config for firebase cloud functions (used in a sapper project)

tsconfig.json

{
  "compilerOptions": {
    "allowJs": true,
    "alwaysStrict": true,
    "checkJs": true,
    "module": "commonjs",
    "noFallthroughCasesInSwitch": true,
    "noImplicitAny": true,
    "noImplicitReturns": true,
    "noImplicitThis": true, /* Raise error on 'this' expressions with an implied 'any' type. */
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "outDir": "lib",
    "removeComments": true,
    "sourceMap": true,
    "strict": true,
    "strictNullChecks": true,
    "target": "es2017"
  },
  "compileOnSave": true,
  "include": [
    "src"
  ]
}