How to use the @casual-simulation/crypto.parsePublicPEMKey function in @casual-simulation/crypto

async importPublicKey(key: string): Promise {
        const buffer = parsePublicPEMKey(key);
        const cryptoKey = await crypto.subtle.importKey(
            'spki',
            buffer,
            {
                name: 'ECDSA',
                namedCurve: BrowserSigningCryptoImpl.NAMED_CURVE,
            },
            true,
            ['verify']
        );

        return new BrowserPublicCryptoKey(cryptoKey);
    }