@polkadot/types/extrinsic/util.js

Implementation of the Parity codec

export function sign(registry, signerPair, u8a, options) {
    const encoded = u8a.length > 256
        ? registry.hash(u8a)
        : u8a;
    return signerPair.sign(encoded, options);
}
export function signGeneral(registry, u8a) {
    const encoded = registry.hash(u8a);
    return encoded;
}