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

function applyUpdate(
  ast: Program,
  uint8Buffer: Uint8Array,
  [oldNode, newNode]: [Node, Node]
): State {
  const deltaElements = 0;

  assertHasLoc(oldNode);

  const sectionName = getSectionForNode(newNode);
  const replacementByteArray = encodeNode(newNode);

  /**
   * Replace new node as bytes
   */
  uint8Buffer = overrideBytesInBuffer(
    uint8Buffer,
    // $FlowIgnore: assertHasLoc ensures that
    oldNode.loc.start.column,
    // $FlowIgnore: assertHasLoc ensures that
    oldNode.loc.end.column,
    replacementByteArray
  );

  /**
   * Update function body size if needed

function applyAdd(ast: Program, uint8Buffer: Uint8Array, node: Node): State {
  const deltaElements = +1; // since we added an element

  const sectionName = getSectionForNode(node);

  let sectionMetadata = getSectionMetadata(ast, sectionName);

  // Section doesn't exists, we create an empty one
  if (typeof sectionMetadata === "undefined") {
    const res = createEmptySection(ast, uint8Buffer, sectionName);

    uint8Buffer = res.uint8Buffer;
    sectionMetadata = res.sectionMetadata;
  }

  /**
   * Add nodes
   */
  const newByteArray = encodeNode(node);

function applyAdd(ast: Program, uint8Buffer: Uint8Array, node: Node): State {
  const deltaElements = +1; // since we added an element

  const sectionName = getSectionForNode(node);

  let sectionMetadata = getSectionMetadata(ast, sectionName);

  // Section doesn't exists, we create an empty one
  if (typeof sectionMetadata === "undefined") {
    const res = createEmptySection(ast, uint8Buffer, sectionName);

    uint8Buffer = res.uint8Buffer;
    sectionMetadata = res.sectionMetadata;
  }

  /**
   * check that the expressions were ended
   */
  if (isFunc(node)) {
    // $FlowIgnore

function applyDelete(ast: Program, uint8Buffer: Uint8Array, node: Node): State {
  const deltaElements = -1; // since we removed an element

  assertHasLoc(node);

  const sectionName = getSectionForNode(node);

  if (sectionName === "start") {
    const sectionMetadata = getSectionMetadata(ast, "start");

    /**
     * The start section only contains one element,
     * we need to remove the whole section
     */
    uint8Buffer = removeSections(ast, uint8Buffer, "start");

    const deltaBytes = -(sectionMetadata.size.value + 1); /* section id */

    return { uint8Buffer, deltaBytes, deltaElements };
  }

  // replacement is nothing

function applyUpdate(ast, uint8Buffer, _ref) {
  var _ref2 = _slicedToArray(_ref, 2),
      oldNode = _ref2[0],
      newNode = _ref2[1];

  var deltaElements = 0;
  assertHasLoc(oldNode);
  var sectionName = getSectionForNode(newNode);
  var replacementByteArray = encodeNode(newNode);
  /**
   * Replace new node as bytes
   */

  uint8Buffer = overrideBytesInBuffer(uint8Buffer, // $FlowIgnore: assertHasLoc ensures that
  oldNode.loc.start.column, // $FlowIgnore: assertHasLoc ensures that
  oldNode.loc.end.column, replacementByteArray);
  /**
   * Update function body size if needed
   */

  if (sectionName === "code") {
    // Find the parent func
    traverse(ast, {
      Func: function Func(_ref3) {

function applyAdd(ast, uint8Buffer, node) {
  var deltaElements = +1; // since we added an element

  var sectionName = getSectionForNode(node);
  var sectionMetadata = getSectionMetadata(ast, sectionName); // Section doesn't exists, we create an empty one

  if (typeof sectionMetadata === "undefined") {
    var res = createEmptySection(ast, uint8Buffer, sectionName);
    uint8Buffer = res.uint8Buffer;
    sectionMetadata = res.sectionMetadata;
  }
  /**
   * Add nodes
   */


  var newByteArray = encodeNode(node); // The size of the section doesn't include the storage of the size itself
  // we need to manually add it here

  var start = getEndOfSection(sectionMetadata);

ops.forEach(function (op) {
    var state;
    var sectionName;

    switch (op.kind) {
      case "update":
        state = applyUpdate(ast, uint8Buffer, [op.oldNode, op.node]);
        sectionName = getSectionForNode(op.node);
        break;

      case "delete":
        state = applyDelete(ast, uint8Buffer, op.node);
        sectionName = getSectionForNode(op.node);
        break;

      case "add":
        state = applyAdd(ast, uint8Buffer, op.node);
        sectionName = getSectionForNode(op.node);
        break;

      default:
        throw new Error("Unknown operation");
    }
    /**

Node: function Node(_ref3) {
      var node = _ref3.node;
      var section = getSectionForNode(node);

      if (section === sectionName && _typeof(node.loc) === "object") {
        shiftLoc(node, delta);
      }
    }
  });

Node: function Node(_ref3) {
      var node = _ref3.node;
      var section = getSectionForNode(node);

      if (section === sectionName && _typeof(node.loc) === "object") {
        shiftLoc(node, delta);
      }
    }
  });

var sectionName;

    switch (op.kind) {
      case "update":
        state = applyUpdate(ast, uint8Buffer, [op.oldNode, op.node]);
        sectionName = getSectionForNode(op.node);
        break;

      case "delete":
        state = applyDelete(ast, uint8Buffer, op.node);
        sectionName = getSectionForNode(op.node);
        break;

      case "add":
        state = applyAdd(ast, uint8Buffer, op.node);
        sectionName = getSectionForNode(op.node);
        break;

      default:
        throw new Error("Unknown operation");
    }
    /**
     * Resize section vec size.
     * If the length of the LEB-encoded size changes, this can change
     * the byte length of the section and the offset for nodes in the
     * section. So we do this first before resizing section byte size
     * or shifting following operations' nodes.
     */


    if (state.deltaElements !== 0 && sectionName !== "start") {
      var oldBufferLength = state.uint8Buffer.length;