noImplicitAny

noImplicitAny prevents implicit any when types cannot be inferred.

Example

function sum(a, b) {
  return a + b;
}

With noImplicitAny: true, this becomes an error.

function sumTyped(a: number, b: number) {
  return a + b;
}

Notes

• Catches untyped parameters and values.
• Best used with strict: true.