@btc-vision/transaction/build/transaction/utils/WitnessUtils.js

OPNet transaction library allows you to create and sign transactions for the OPNet network.

import { varuint } from '@btc-vision/bitcoin';
/**
 * Convert witness stack to script witness buffer
 * @param {Uint8Array[]} witness - The witness stack
 * @returns {Uint8Array}
 */
export function witnessStackToScriptWitness(witness) {
    let buffer = new Uint8Array(0);
    function concatBuffers(a, b) {
        const result = new Uint8Array(a.length + b.length);
        result.set(a, 0);
        result.set(b, a.length);
        return result;
    }
    function writeSlice(slice) {
        buffer = concatBuffers(buffer, slice);
    }
    function writeVarInt(i) {
        const currentLen = buffer.length;
        const varintLen = varuint.encodingLength(i);
        const newBuffer = new Uint8Array(currentLen + varintLen);
        newBuffer.set(buffer, 0);
        buffer = newBuffer;
        varuint.encode(i, buffer, currentLen);
    }
    function writeVarSlice(slice) {
        writeVarInt(slice.length);
        writeSlice(slice);
    }
    function writeVector(vector) {
        writeVarInt(vector.length);
        vector.forEach(writeVarSlice);
    }
    writeVector(witness);
    return buffer;
}
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