ts-is-defined

Typescript utilities

Usage no npm install needed!

<script type="module">
  import tsIsDefined from 'https://cdn.skypack.dev/ts-is-defined';
</script>

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ts-is-defined

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Typescript utilities

export function isDefined<T>(value: T): value is NonNullable<T> {
  return value !== undefined && value !== null
}

export function assertDefined<T>(
  value: T,
  message: string
): asserts value is NonNullable<T> {
  invariant(isDefined(value), message)
}