tsconfig.json

{
  "compilerOptions": {
    "target": "ES2018",
    "module": "commonjs",
    "lib": ["es2018", "dom"],
    "declaration": true,
    "declarationMap": true,
    "sourceMap": true,
    "outDir": "./dist",
    "rootDir": "./",
    "strict": true,
    "noImplicitAny": true,
    "strictNullChecks": true,
    "strictFunctionTypes": true,
    "strictBindCallApply": true,
    "strictPropertyInitialization": true,
    "noImplicitThis": true,
    "alwaysStrict": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
    "moduleResolution": "node",
    "baseUrl": "./",
    "paths": {
      "*": ["node_modules/*", "_gulp/types/*", "./typings"]
    },
    "esModuleInterop": true,
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "forceConsistentCasingInFileNames": true,
    "types": ["node", "gulp", "gulp-imagemin", "browserify", "gulp-rename", "gulp-uglify", "vinyl-buffer", "vinyl-source-stream"],
    "typeRoots": ["node_modules/@types", "_gulp/types", "./typings"]
  },
  "include": [
    "_gulp/**/*",
    "_gulp/types/custom.d.ts"
  ],
  "exclude": [
    "node_modules",
    "**/*.spec.ts"
  ]
}