tsconfig.json

{
    "compilerOptions": {
        "target": "es5",

        // Module
        "module": "es2015",
        "moduleResolution": "node",
        "allowSyntheticDefaultImports": true,
        "esModuleInterop": true,

        // Path
        "rootDir": "./src",
        "outDir": "./lib/",

        // Delcaration
        "declaration": true,
        "declarationDir": "./lib/declaration",

        // Log
        "pretty": true,

        // Lint
        "strict": true,
        "allowUnreachableCode": false,
        "allowUnusedLabels": false,
        "noFallthroughCasesInSwitch": true,
        "noImplicitReturns": true,
        "noUnusedLocals": true,
        "noUnusedParameters": true,
        "newLine": "lf",

        // Outfile
        "charset": "utf8",
        "removeComments": true,
        "noEmitOnError": true,

        // SourceMap
        "sourceMap": true,

        // etc
        "importHelpers": true,
        "downlevelIteration": true
    },
    "include": [
        "./src/**/*.ts"
    ]
  }