3 ms·

I think it's just the sample code needs to be x === null. Nothing to do with TypeScript. The sample is a good example to illustrate the union type.

• noselasd 10y ago
  On that note, are there any documentation that explains the == and === operators in Typescript ? The language spec is only briefly acknowledges the existence of those operators.
  • eyko 10y ago
    They behave exactly like they would in JavaScript.