tsconfig.json

{
    "compilerOptions": {
        "target": "ESNext",
        "baseUrl": "./src/ts/",
        "outFile": "./src/output/build.js",
        "lib": [
            "es2016",
            "dom"
        ],
        "module": "system",
        "strict": true,
        "removeComments": true,
        "alwaysStrict": true,
        "allowUnreachableCode": false,
        "noImplicitAny": true,
        "noImplicitThis": true,
        "noUnusedLocals": true,
        "noUnusedParameters": true,
        "noImplicitReturns": true,
        "noFallthroughCasesInSwitch": true,
        "forceConsistentCasingInFileNames": true,
        "importHelpers": true
    }
}