INNER CODE UNIT · TypeScript

assertIsKeys

vercel/storage · packages/global-config/src/utils/index.ts:46

export function assertIsKeys(keys: unknown): asserts keys is string[] {
  if (!Array.isArray(keys) || keys.some((key) => typeof key !== 'string')) {
    throw new Error(
      '@vercel/global-config: Expected keys to be an array of string',
    );
  }
}

/**
 * Creates a deep clone of an object.
 */
export const clone = trace(
  function clone<T>(value: T): T {
    // only available since node v17.0.0
    if (typeof structuredClone === 'function') return structuredClone<T>(value);

    // poor man's polyfill for structuredClone
    if (value === undefined) return value;

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