fix argument validation

jsteuer

2019-12-21 cd876c0026bf59831c0322946f0d73a8328c1b3f

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{
  "compilerOptions": {
    "module": "commonjs",
    "target": "es5",
    "declaration": true,
    "outDir": "./dist",
    "lib": [
      "DOM",
      "ES2016"
    ],
    "strict": true
  } 
}