Convert `<svg-icon>` component to React

src/sidebar/components/svg-icon.js

 'use strict';
 
-/**
- * The <svg-icon> component renders SVG icons using inline <svg> tags,
- * enabling their appearance to be customized via CSS.
- *
- * This matches the way we do icons on the website, see
- * https://github.com/hypothesis/h/pull/3675
- */
+const { createElement } = require('preact');
+const propTypes = require('prop-types');
 
 // The list of supported icons
 const icons = {
@@ -14,21 +9,24 @@ const icons = {
   cursor: require('../../images/icons/cursor.svg'),
 };
 
-// @ngInject
-function SvgIconController($element) {
-  this.$onInit = () => {
-    if (!icons[this.name]) {
-      throw new Error('Unknown icon: ' + this.name);
-    }
-    $element[0].innerHTML = icons[this.name];
-  };
+/**
+ * Component that renders icons using inline `<svg>` elements.
+ * This enables their appearance to be customized via CSS.
+ *
+ * This matches the way we do icons on the website, see
+ * https://github.com/hypothesis/h/pull/3675
+ */
+function SvgIcon({ name }) {
+  if (!icons[name]) {
+    throw new Error(`Unknown icon ${name}`);
+  }
+  const markup = { __html: icons[name] };
+  return <span dangerouslySetInnerHTML={markup} />;
 }
 
-module.exports = {
-  controllerAs: 'vm',
-  controller: SvgIconController,
-  bindings: {
-    /** The name of the icon to load. */
-    name: '<',
-  },
+SvgIcon.propTypes = {
+  /** The name of the icon to load. */
+  name: propTypes.string,
 };
+
+module.exports = SvgIcon;

src/sidebar/components/test/svg-icon-test.js

 'use strict';
 
-const angular = require('angular');
+const { createElement, render } = require('preact');
 
-const util = require('../../directive/test/util');
+const SvgIcon = require('../svg-icon');
 
-describe('svgIcon', function() {
-  before(function() {
-    angular.module('app', []).component('svgIcon', require('../svg-icon'));
+describe('SvgIcon', () => {
+  it("sets the element's content to the content of the SVG", () => {
+    const container = document.createElement('div');
+    render(<SvgIcon name="refresh" />, container);
+    assert.ok(container.querySelector('svg'));
   });
 
-  beforeEach(function() {
-    angular.mock.module('app');
-  });
-
-  it("sets the element's content to the content of the SVG", function() {
-    const el = util.createDirective(document, 'svgIcon', { name: 'refresh' });
-    assert.ok(el[0].querySelector('svg'));
-  });
-
-  it('throws an error if the icon is unknown', function() {
-    assert.throws(function() {
-      util.createDirective(document, 'svgIcon', { name: 'unknown' });
+  it('throws an error if the icon is unknown', () => {
+    assert.throws(() => {
+      const container = document.createElement('div');
+      render(<SvgIcon name="unknown" />, container);
     });
   });
 });

src/sidebar/index.js

@@ -184,7 +184,7 @@ function startAngularApp(config) {
     .component('sortDropdown', require('./components/sort-dropdown'))
     .component('spinner', require('./components/spinner'))
     .component('streamContent', require('./components/stream-content'))
-    .component('svgIcon', require('./components/svg-icon'))
+    .component('svgIcon', wrapReactComponent(require('./components/svg-icon')))
     .component('tagEditor', require('./components/tag-editor'))
     .component('threadList', require('./components/thread-list'))
     .component('timestamp', require('./components/timestamp'))