feat(reverseHighlight/reverseSnippet): Implements reverseHighlight and reverseSnippet

package.json

@@ -143,7 +143,7 @@
   "bundlesize": [
     {
       "path": "./dist/instantsearch.production.min.js",
-      "maxSize": "65.25 kB"
+      "maxSize": "65.5 kB"
     },
     {
       "path": "./dist/instantsearch.development.js",

src/helpers/__tests__/reverseHighlight-test.ts

@@ -0,0 +1,203 @@
+import reverseHighlight from '../reverseHighlight';
+
+const NONE = 'none' as const;
+const FULL = 'full' as const;
+
+/* eslint-disable @typescript-eslint/camelcase */
+const hit = {
+  name: 'Amazon - Fire TV Stick with Alexa Voice Remote - Black',
+  description:
+    'Enjoy smart access to videos, games and apps with this Amazon Fire TV stick. Its Alexa voice remote lets you deliver hands-free commands when you want to watch television or engage with other applications. With a quad-core processor, 1GB internal memory and 8GB of storage, this portable Amazon Fire TV stick works fast for buffer-free streaming.',
+  brand: 'Amazon',
+  categories: ['TV & Home Theater', 'Streaming Media Players'],
+  hierarchicalCategories: {
+    lvl0: 'TV & Home Theater',
+    lvl1: 'TV & Home Theater > Streaming Media Players',
+  },
+  type: 'Streaming - (media plyr)',
+  price: 39.99,
+  price_range: '1 - 50',
+  image: 'https://cdn-demo.algolia.com/bestbuy-0118/5477500_sb.jpg',
+  url: 'https://api.bestbuy.com/click/-/5477500/pdp',
+  free_shipping: false,
+  rating: 4,
+  popularity: 21469,
+  objectID: '5477500',
+  _highlightResult: {
+    name: {
+      value:
+        '<mark>Amazon</mark> - Fire TV Stick with Alexa Voice Remote - Black',
+      matchLevel: FULL,
+      fullyHighlighted: false,
+      matchedWords: ['amazon'],
+    },
+    description: {
+      value:
+        'Enjoy smart access to videos, games and apps with this <mark>Amazon</mark> Fire TV stick. Its Alexa voice remote lets you deliver hands-free commands when you want to watch television or engage with other applications. With a quad-core <mark>processor</mark>, <mark>1GB</mark> internal memory and 8GB of storage, this portable <mark>Amazon</mark> Fire TV stick works fast for buffer-free streaming.',
+      matchLevel: FULL,
+      fullyHighlighted: false,
+      matchedWords: ['amazon', 'processor', '1GB'],
+    },
+    brand: {
+      value: '<mark>Amazon</mark>',
+      matchLevel: FULL,
+      fullyHighlighted: true,
+      matchedWords: ['amazon'],
+    },
+    categories: [
+      {
+        value: 'TV & Home Theater',
+        matchLevel: NONE,
+        matchedWords: [],
+      },
+      {
+        value: 'Streaming Media Players',
+        matchLevel: NONE,
+        matchedWords: [],
+      },
+    ],
+    type: {
+      value: '<mark>Streaming</mark> - (<mark>media</mark> plyr)',
+      matchLevel: FULL,
+      fullyHighlighted: false,
+      matchedWords: ['streaming', 'media'],
+    },
+    typeMissingSibling: {
+      value: 'Streaming - (<mark>media</mark> plyr)',
+      matchLevel: FULL,
+      fullyHighlighted: false,
+      matchedWords: ['media'],
+    },
+    typeFullMatch: {
+      value: '<mark>Streaming</mark> - (<mark>media</mark> <mark>plyr</mark>)',
+      matchLevel: FULL,
+      fullyHighlighted: false,
+      matchedWords: ['streaming', 'media', 'plyr'],
+    },
+    meta: {
+      name: {
+        value: 'Nested <mark>Amazon</mark> name',
+        matchLevel: NONE,
+        matchedWords: ['Amazon'],
+      },
+    },
+  },
+};
+/* eslint-enable @typescript-eslint/camelcase */
+
+describe('reverseHighlight', () => {
+  test('with default tag name', () => {
+    expect(
+      reverseHighlight({
+        attribute: 'name',
+        hit,
+      })
+    ).toMatchInlineSnapshot(
+      `"Amazon<mark class=\\"ais-ReverseHighlight-highlighted\\"> - Fire TV Stick with Alexa Voice Remote - Black</mark>"`
+    );
+  });
+
+  test('with full match', () => {
+    expect(
+      reverseHighlight({
+        attribute: 'typeFullMatch',
+        hit,
+      })
+    ).toMatchInlineSnapshot(`"Streaming - (media plyr)"`);
+  });
+
+  test('with custom tag name', () => {
+    expect(
+      reverseHighlight({
+        attribute: 'description',
+        highlightedTagName: 'em',
+        hit,
+      })
+    ).toMatchInlineSnapshot(
+      `"<em class=\\"ais-ReverseHighlight-highlighted\\">Enjoy smart access to videos, games and apps with this </em>Amazon<em class=\\"ais-ReverseHighlight-highlighted\\"> Fire TV stick. Its Alexa voice remote lets you deliver hands-free commands when you want to watch television or engage with other applications. With a quad-core </em>processor, 1GB<em class=\\"ais-ReverseHighlight-highlighted\\"> internal memory and 8GB of storage, this portable </em>Amazon<em class=\\"ais-ReverseHighlight-highlighted\\"> Fire TV stick works fast for buffer-free streaming.</em>"`
+    );
+  });
+
+  test('with custom highlighted class name', () => {
+    expect(
+      reverseHighlight({
+        attribute: 'description',
+        cssClasses: { highlighted: '__highlighted class' },
+        hit,
+      })
+    ).toMatchInlineSnapshot(
+      `"<mark class=\\"ais-ReverseHighlight-highlighted __highlighted class\\">Enjoy smart access to videos, games and apps with this </mark>Amazon<mark class=\\"ais-ReverseHighlight-highlighted __highlighted class\\"> Fire TV stick. Its Alexa voice remote lets you deliver hands-free commands when you want to watch television or engage with other applications. With a quad-core </mark>processor, 1GB<mark class=\\"ais-ReverseHighlight-highlighted __highlighted class\\"> internal memory and 8GB of storage, this portable </mark>Amazon<mark class=\\"ais-ReverseHighlight-highlighted __highlighted class\\"> Fire TV stick works fast for buffer-free streaming.</mark>"`
+    );
+  });
+
+  test('with unknown attribute returns an empty string', () => {
+    expect(
+      reverseHighlight({
+        attribute: 'wrong-attribute',
+        hit,
+      })
+    ).toMatchInlineSnapshot(`""`);
+  });
+
+  test('with nested attribute', () => {
+    expect(
+      reverseHighlight({
+        attribute: 'meta.name',
+        hit,
+      })
+    ).toMatchInlineSnapshot(
+      `"<mark class=\\"ais-ReverseHighlight-highlighted\\">Nested </mark>Amazon<mark class=\\"ais-ReverseHighlight-highlighted\\"> name</mark>"`
+    );
+  });
+
+  test('with nested attribute as array', () => {
+    expect(
+      reverseHighlight({
+        attribute: ['meta', 'name'],
+        hit,
+      })
+    ).toMatchInlineSnapshot(
+      `"<mark class=\\"ais-ReverseHighlight-highlighted\\">Nested </mark>Amazon<mark class=\\"ais-ReverseHighlight-highlighted\\"> name</mark>"`
+    );
+  });
+
+  test('with array attribute', () => {
+    expect(
+      reverseHighlight({
+        attribute: 'categories.1',
+        hit,
+      })
+    ).toMatchInlineSnapshot(`"Streaming Media Players"`);
+  });
+
+  test('with array attribute as array', () => {
+    expect(
+      reverseHighlight({
+        attribute: ['categories', '1'],
+        hit,
+      })
+    ).toMatchInlineSnapshot(`"Streaming Media Players"`);
+  });
+
+  test('with non-alphanumeric character with alphanumeric siblings matching highlight', () => {
+    expect(
+      reverseHighlight({
+        attribute: 'type',
+        hit,
+      })
+    ).toMatchInlineSnapshot(
+      `"Streaming - (media<mark class=\\"ais-ReverseHighlight-highlighted\\"> plyr)</mark>"`
+    );
+  });
+
+  test('with non-alphanumeric character with different alphanumeric siblings highlight', () => {
+    expect(
+      reverseHighlight({
+        attribute: 'typeMissingSibling',
+        hit,
+      })
+    ).toMatchInlineSnapshot(
+      `"<mark class=\\"ais-ReverseHighlight-highlighted\\">Streaming - (</mark>media<mark class=\\"ais-ReverseHighlight-highlighted\\"> plyr)</mark>"`
+    );
+  });
+});