jose/dist/webapi/lib/key_options.js

JWA, JWS, JWE, JWT, JWK, JWKS for Node.js, Browser, Cloudflare Workers, Deno, Bun, and other Web-interoperable runtimes

export function validateExtractableOption(extractable) {
    if (extractable !== undefined && typeof extractable !== 'boolean') {
        throw new TypeError('"extractable" option must be a boolean');
    }
    return extractable;
}