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export default (alg: string, key: CryptoKey) => {  if (alg.startsWith('RS') || alg.startsWith('PS')) {    const { modulusLength } = <RsaKeyAlgorithm>key.algorithm    if (typeof modulusLength !== 'number' || modulusLength < 2048) {      throw new TypeError(`${alg} requires key modulusLength to be 2048 bits or larger`)    }  }}