tsconfig.json

{
  "compilerOptions": {
    "lib": ["dom", "ES2015"],
    "target": "es6",
    "module": "commonjs",
    "baseUrl": "./src",
    "paths": {
      "~/*": ["./src"]
    },
    "types": ["web", "chrome", "node", "webextension-polyfill-ts"],
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,
    "strict": true,
    "noImplicitAny": true,
    "strictNullChecks": true,
    "strictFunctionTypes": true,
    "strictBindCallApply": true,
    "strictPropertyInitialization": true,
    "noImplicitThis": true,
    "useUnknownInCatchVariables": true,
    "alwaysStrict": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "exactOptionalPropertyTypes": true,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
    "noUncheckedIndexedAccess": true,
    "noImplicitOverride": true,
    "noPropertyAccessFromIndexSignature": true,
    "allowUnusedLabels": true,
    "allowUnreachableCode": true,
    "skipDefaultLibCheck": true,
    "skipLibCheck": true
  },
  "include": ["src", "tests"]
}