Convert src/annotator/anchoring to ES modules

src/annotator/anchoring/pdf.js

 /* global PDFViewerApplication */
 
-const seek = require('dom-seek');
+import seek from 'dom-seek';
 
 // `dom-node-iterator` polyfills optional arguments of `createNodeIterator`
 // and properties of the returned `NodeIterator` for IE 11 compatibility.
 const createNodeIterator = require('dom-node-iterator/polyfill')();
 
-const xpathRange = require('./range');
-const RenderingStates = require('../pdfjs-rendering-states');
-const { TextPositionAnchor, TextQuoteAnchor } = require('./types');
-const { toRange: textPositionToRange } = require('./text-position');
+import RenderingStates from '../pdfjs-rendering-states';
+
+import xpathRange from './range';
+import { toRange as textPositionToRange } from './text-position';
+import { TextPositionAnchor, TextQuoteAnchor } from './types';
 
 // Caches for performance.
 
@@ -342,7 +343,7 @@ function prioritizePages(position) {
  * @param {Array} selectors - Selector objects to anchor
  * @return {Promise<Range>}
  */
-function anchor(root, selectors) {
+export function anchor(root, selectors) {
   const position = selectors.find(s => s.type === 'TextPositionSelector');
   const quote = selectors.find(s => s.type === 'TextQuoteSelector');
 
@@ -406,7 +407,7 @@ function anchor(root, selectors) {
  *   `toSelector` methods.
  * @return {Promise<[TextPositionSelector, TextQuoteSelector]>}
  */
-function describe(root, range, options = {}) {
+export function describe(root, range, options = {}) {
   const normalizedRange = new xpathRange.BrowserRange(range).normalize();
 
   const startTextLayer = getNodeTextLayer(normalizedRange.start);
@@ -461,13 +462,7 @@ function describe(root, range, options = {}) {
  *
  * This exists mainly as a helper for use in tests.
  */
-function purgeCache() {
+export function purgeCache() {
   pageTextCache = {};
   quotePositionCache = {};
 }
-
-module.exports = {
-  anchor,
-  describe,
-  purgeCache,
-};

src/annotator/anchoring/test/fake-pdf-viewer-application.js

@@ -9,7 +9,7 @@
  * each of the relevant classes in PDF.js.
  */
 
-const RenderingStates = require('../../pdfjs-rendering-states');
+import RenderingStates from '../../pdfjs-rendering-states';
 
 /**
  * Create the DOM structure for a page which matches the structure produced by
@@ -197,7 +197,7 @@ class FakePDFViewer {
  *
  * The original is defined at https://github.com/mozilla/pdf.js/blob/master/web/app.js
  */
-class FakePDFViewerApplication {
+export default class FakePDFViewerApplication {
   /**
    * @param {Options} options
    */
@@ -215,5 +215,3 @@ class FakePDFViewerApplication {
     this.pdfViewer.dispose();
   }
 }
-
-module.exports = FakePDFViewerApplication;

src/annotator/anchoring/test/html-baselines/index.js

@@ -21,7 +21,7 @@
 //     them as `<fixture name>.json` in this directory
 //  4. Add an entry to the fixture list below.
 
-module.exports = [
+export default [
   {
     name: 'Minimal Document',
     html: require('./minimal.html'),

src/annotator/anchoring/test/html-test.js

-const html = require('../html');
+import { toResult } from '../../../shared/test/promise-util';
+import * as html from '../html';
 
-const { toResult } = require('../../../shared/test/promise-util');
-const fixture = require('./html-anchoring-fixture.html');
-const htmlBaselines = require('./html-baselines');
+import fixture from './html-anchoring-fixture.html';
+import htmlBaselines from './html-baselines';
 
 /** Return all text node children of `container`. */
 function textNodes(container) {

src/annotator/anchoring/test/pdf-test.js

-const domAnchorTextQuote = require('dom-anchor-text-quote');
+import * as domAnchorTextQuote from 'dom-anchor-text-quote';
 
-const FakePDFViewerApplication = require('./fake-pdf-viewer-application');
-const pdfAnchoring = require('../pdf');
+import * as pdfAnchoring from '../pdf';
+
+import FakePDFViewerApplication from './fake-pdf-viewer-application';
 
 /**
  * Return a DOM Range which refers to the specified `text` in `container`.

src/annotator/anchoring/test/text-position-test.js

-const { toRange } = require('../text-position');
+import { toRange } from '../text-position';
 
 describe('text-position', () => {
   let container;

src/annotator/anchoring/test/types-test.js

-const types = require('../types');
+import * as types from '../types';
 
 const TextQuoteAnchor = types.TextQuoteAnchor;
 const TextPositionAnchor = types.TextPositionAnchor;

src/annotator/anchoring/text-position.js

@@ -21,7 +21,7 @@
  * @param {number} end - Character offset within `root.textContent`
  * @return {Range} Range spanning text from `start` to `end`
  */
-function toRange(root, start, end) {
+export function toRange(root, start, end) {
   // The `filter` and `expandEntityReferences` arguments are mandatory in IE
   // although optional according to the spec.
   const nodeIter = root.ownerDocument.createNodeIterator(
@@ -76,7 +76,3 @@ function toRange(root, start, end) {
 
   return range;
 }
-
-module.exports = {
-  toRange,
-};