Function assertIsNullable

Asserts that a value is either null or undefined.

Throws

An error with message 'Expected a non-nullable value' if the value is not null or undefined.

Example

const fn = (x?: number | null) => {
  assertIsNullable(x); // throws an error if x is not null or undefined
  return x; // x has inferred type null | undefined
};
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