tsconfig.json

{
    "compilerOptions": {
        "baseUrl": "src/", // enables relative imports to root
        "outDir": "dist/", // target for compiled files
        "allowSyntheticDefaultImports": true, // no errors on commonjs default import
        "checkJs": false, // typecheck js files 
        "skipLibCheck": true,
        "declaration": true, // emit declaration files so 
        "emitDecoratorMetadata": true,
        "experimentalDecorators": true,
        "forceConsistentCasingInFileNames": true,
        "importHelpers": true, // importing helper functions from tslib
        "noEmitHelpers": true, // disable emitting inline helper functions
        "listFiles": false,
        "listEmittedFiles": false,
        "lib": [
            "dom",
            "es2016",
            "es2017.object"
        ],
        "noUnusedLocals": false,
        "target": "es5",
        "module": "commonjs",
        "moduleResolution": "node",
        "noEmit": false,
        "noEmitOnError": true,
        "noFallthroughCasesInSwitch": true,
        "noImplicitAny": false,
        "noImplicitReturns": false,
        "noImplicitThis": false,
        "strictNullChecks": true,
        "pretty": true,
        "removeComments": true,
        "sourceMap": true
    },
    "include": [
        "src/index.ts"
    ],
    "exclude": [
        "node_modules"
    ]
}