lib/get-updater.js
function getUpdater(errorFn) {
  errorFn = errorFn || new Function();
  return updater;

  /**
   * The updater function for the esprima transform
   * @param {string} file The filename for the Browserify transform
   * @param {object} ast The esprima syntax tree
   * @returns {object} The transformed esprima syntax tree
   */
  function updater(file, ast) {
    if (ast.comments) {
      ast.comments
        .filter(testDocTag)
        .map(getAnnotatedNode)
        .concat(inferAngular(ast))    // find the items that are not explicitly annotated
        .filter(testFirstOccurrence)  // ensure unique values
        .forEach(processNode);
    } else {
      errorFn('Esprima AST is required to have top-level comments array');
    }
    return ast;
  }

  /**
   * Get the node that is annotated by the comment or throw if not present.
   * @throws {Error} Where comment does not annotate a node
   * @param {object} comment The comment node
   */
  function getAnnotatedNode(comment) {

    // find the first function declaration or expression following the annotation
    var result;
    if (comment.annotates) {
      var candidateTrees;

      // consider the context the block is in (i.e. what is its parent)
      var parent = comment.annotates.parent;

      // consider nodes from the annotated node forward
      //  include the first non-generated node and all generated nodes preceding it
      if (testNode.isBlockOrProgram(parent)) {
        var body = parent.body;
        var index = body.indexOf(comment.annotates);
        var candidates = body.slice(index);
        var length = candidates.map(testNode.isGeneratedCode).indexOf(false) + 1;
        candidateTrees = candidates.slice(0, length || candidates.length);
      }
      // otherwise we can only consider the given node
      else {
        candidateTrees = [comment.annotates];
      }

      // try the nodes
      while (!result && candidateTrees.length) {
        result = esprimaTools
          .orderNodes(candidateTrees.shift())
          .filter(testNode.isFunctionNotIFFE)
          .shift();
      }
    }

    // throw where not valid
    if (result) {
      return result;
    } else {
      errorFn('Doc-tag @ngInject does not annotate anything');
    }
  }
}
function getUpdater(errorFn) {
  errorFn = errorFn || new Function();
  return updater;

  /**
   * The updater function for the esprima transform
   * @param {string} file The filename for the Browserify transform
   * @param {object} ast The esprima syntax tree
   * @returns {object} The transformed esprima syntax tree
   */
  function updater(file, ast) {
    if (ast.comments) {
      ast.comments
        .filter(testDocTag)
        .map(getAnnotatedNode)
        .concat(inferAngular(ast))    // find the items that are not explicitly annotated
        .filter(testFirstOccurrence)  // ensure unique values
        .forEach(processNode);
    } else {
      errorFn('Esprima AST is required to have top-level comments array');
    }
    return ast;
  }

  /**
   * Get the node that is annotated by the comment or throw if not present.
   * @throws {Error} Where comment does not annotate a node
   * @param {object} comment The comment node
   */
  function getAnnotatedNode(comment) {

    // find the first function declaration or expression following the annotation
    var result;
    if (comment.annotates) {
      var candidateTrees;

      // consider the context the block is in (i.e. what is its parent)
      var parent = comment.annotates.parent;

      // consider nodes from the annotated node forward
      //  include the first non-generated node and all generated nodes preceding it
      if (testNode.isBlockOrProgram(parent)) {
        var body = parent.body;
        var index = body.indexOf(comment.annotates);
        var candidates = body.slice(index);
        var length = candidates.map(testNode.isGeneratedCode).indexOf(false) + 1;
        candidateTrees = candidates.slice(0, length || candidates.length);
      }
      // otherwise we can only consider the given node
      else {
        candidateTrees = [comment.annotates];
      }

      // try the nodes
      while (!result && candidateTrees.length) {
        result = esprimaTools
          .orderNodes(candidateTrees.shift())
          .filter(testNode.isFunctionNotIFFE)
          .shift();
      }
    }

    // throw where not valid
    if (result) {
      return result;
    } else {
      errorFn('Doc-tag @ngInject does not annotate anything');
    }
  }
}
Create an updater function for the esprima transform with the given error handler
@param {function} [errorFn] An optional error handler function
@returns {function(string, object):object} A method that transforms the esprima tree