How to use the @webassemblyjs/helper-wasm-bytecode.sections function in @webassemblyjs/helper-wasm-bytecode

function findLastSection(
  ast: Program,
  forSection: SectionName
): ?SectionMetadata {
  const targetSectionId = constants.sections[forSection];

  // $FlowIgnore: metadata can not be empty
  const moduleSections = ast.body[0].metadata.sections;

  let lastSection;
  let lastId = 0;

  for (let i = 0, len = moduleSections.length; i < len; i++) {
    const section = moduleSections[i];

    // Ignore custom section since they can actually occur everywhere
    if (section.section === "custom") {
      continue;
    }

    const sectionId = constants.sections[section.section];

nodes.sort(function (a, b) {
    var sectionA = getSectionForNode(a);
    var sectionB = getSectionForNode(b);
    var aId = constants.sections[sectionA];
    var bId = constants.sections[sectionB];

    if (typeof aId !== "number" || typeof bId !== "number") {
      throw new Error("Section id not found");
    }

    if (aId === bId) {
      // $FlowIgnore originalOrder is filled for all nodes
      return originalOrder.get(a) - originalOrder.get(b);
    }

    return aId - bId;
  });
}

nodes.sort(function (a, b) {
    var sectionA = getSectionForNode(a);
    var sectionB = getSectionForNode(b);
    var aId = constants.sections[sectionA];
    var bId = constants.sections[sectionB];

    if (typeof aId !== "number" || typeof bId !== "number") {
      throw new Error("Section id not found");
    }

    if (aId === bId) {
      // $FlowIgnore originalOrder is filled for all nodes
      return originalOrder.get(a) - originalOrder.get(b);
    }

    return aId - bId;
  });
}

function findLastSection(ast, forSection) {
  var targetSectionId = constants.sections[forSection]; // $FlowIgnore: metadata can not be empty

  var moduleSections = ast.body[0].metadata.sections;
  var lastSection;
  var lastId = 0;

  for (var i = 0, len = moduleSections.length; i < len; i++) {
    var section = moduleSections[i]; // Ignore custom section since they can actually occur everywhere

    if (section.section === "custom") {
      continue;
    }

    var sectionId = constants.sections[section.section];

    if (targetSectionId > lastId && targetSectionId < sectionId) {
      return lastSection;
    }

    lastId = sectionId;
    lastSection = section;
  }

  return lastSection;
}

m.metadata.sections.sort(function (a, b) {
    var aId = constants.sections[a.section];
    var bId = constants.sections[b.section];

    if (typeof aId !== "number" || typeof bId !== "number") {
      throw new Error("Section id not found");
    }

    return aId - bId;
  });
}

m.metadata.sections.sort((a, b) => {
    const aId = constants.sections[a.section];
    const bId = constants.sections[b.section];

    if (typeof aId !== "number" || typeof bId !== "number") {
      throw new Error("Section id not found");
    }

    return aId > bId;
  });
}

function parseSection(sectionIndex) {
    var sectionId = readByte();
    eatBytes(1);

    if (sectionId >= sectionIndex || sectionIndex === constants.sections.custom) {
      sectionIndex = sectionId + 1;
    } else {
      if (sectionId !== constants.sections.custom) throw new CompileError("Unexpected section: " + toHex(sectionId));
    }

    var nextSectionIndex = sectionIndex;
    var startOffset = offset;
    var startLoc = getPosition();
    var u32 = readU32();
    var sectionSizeInBytes = u32.value;
    eatBytes(u32.nextIndex);

    var sectionSizeInBytesNode = function () {
      var endLoc = getPosition();
      return t.withLoc(t.numberLiteralFromRaw(sectionSizeInBytes), endLoc, startLoc);
    }();

const numberOfElements = numberOfElementsu32.value;
        eatBytes(numberOfElementsu32.nextIndex);

        const metadata = t.sectionMetadata(
          "element",
          startOffset,
          sectionSizeInBytesNode,
          WITH_LOC(t.numberLiteralFromRaw(numberOfElements), startLoc)
        );

        const nodes = parseElemSection(numberOfElements);

        return { nodes, metadata, nextSectionIndex };
      }

      case constants.sections.global: {
        dumpSep("section Global");
        dump([sectionId], "section code");
        dump([sectionSizeInBytes], "section size");

        const startLoc = getPosition();

        const numberOfGlobalsu32 = readU32();
        const numberOfGlobals = numberOfGlobalsu32.value;
        eatBytes(numberOfGlobalsu32.nextIndex);

        const metadata = t.sectionMetadata(
          "global",
          startOffset,
          sectionSizeInBytesNode,
          WITH_LOC(t.numberLiteralFromRaw(numberOfGlobals), startLoc)
        );

export function encodeSectionMetadata(n) {
  var out = [];
  var sectionId = constants.sections[n.section];

  if (typeof sectionId === "undefined") {
    throw new Error("Unknown section: " + n.section);
  }

  if (n.section === "start") {
    /**
     * This is not implemented yet because it's a special case which
     * doesn't have a vector in its section.
     */
    throw new Error("Unsupported section encoding of type start");
  }

  out.push(sectionId);
  out.push.apply(out, _toConsumableArray(encodeU32(n.size.value)));
  out.push.apply(out, _toConsumableArray(encodeU32(n.vectorOfSize.value)));

export function encodeSectionMetadata(n) {
  var out = [];
  var sectionId = constants.sections[n.section];

  if (typeof sectionId === "undefined") {
    throw new Error("Unknown section: " + n.section);
  }

  if (n.section === "start") {
    /**
     * This is not implemented yet because it's a special case which
     * doesn't have a vector in its section.
     */
    throw new Error("Unsupported section encoding of type start");
  }

  out.push(sectionId);
  out.push.apply(out, _toConsumableArray(encodeU32(n.size.value)));
  out.push.apply(out, _toConsumableArray(encodeU32(n.vectorOfSize.value)));