Import gitbook-markdown

19 files changed, 234 insertions, 275 deletions

diff --git a/packages/gitbook-html/package.json b/packages/gitbook-html/package.json
index 2346220..e0a4214 100644
--- a/packages/gitbook-html/package.json
+++ b/packages/gitbook-html/package.json
@@ -15,7 +15,7 @@
     "type": "git",
     "url": "https://github.com/GitbookIO/gitbook-html.git"
   },
-  "author": "FriendCode Inc. <contact@gitbook.com>",
+  "author": "GitBook Inc. <contact@gitbook.com>",
   "license": "Apache-2.0",
   "bugs": {
     "url": "https://github.com/GitbookIO/gitbook-html/issues"
diff --git a/packages/gitbook-markdown/.gitignore b/packages/gitbook-markdown/.gitignore
deleted file mode 100644
index 9550e4f..0000000
--- a/packages/gitbook-markdown/.gitignore
+++ /dev/null
@@ -1,28 +0,0 @@
-# Logs
-logs
-*.log
-
-# Runtime data
-pids
-*.pid
-*.seed
-
-# Directory for instrumented libs generated by jscoverage/JSCover
-lib-cov
-
-# Coverage directory used by tools like istanbul
-coverage
-
-# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
-.grunt
-
-# Compiled binary addons (http://nodejs.org/api/addons.html)
-build/Release
-
-# Dependency directory
-# Deployed apps should consider commenting this line out:
-# see https://npmjs.org/doc/faq.html#Should-I-check-my-node_modules-folder-into-git
-node_modules
-
-# vim swapfile
-*.swp
diff --git a/packages/gitbook-markdown/.npmignore b/packages/gitbook-markdown/.npmignore
new file mode 100644
index 0000000..85de9cf
--- /dev/null
+++ b/packages/gitbook-markdown/.npmignore
@@ -0,0 +1 @@
+src
diff --git a/packages/gitbook-markdown/.travis.yml b/packages/gitbook-markdown/.travis.yml
deleted file mode 100644
index 3e5e701..0000000
--- a/packages/gitbook-markdown/.travis.yml
+++ /dev/null
@@ -1,4 +0,0 @@
-language: node_js
-node_js:
-  - "stable"
-  - "0.12"
diff --git a/packages/gitbook-markdown/lib/index.js b/packages/gitbook-markdown/lib/index.js
deleted file mode 100644
index d65ebf7..0000000
--- a/packages/gitbook-markdown/lib/index.js
+++ /dev/null
@@ -1,10 +0,0 @@
-var HTMLParser = require('gitbook-html');
-
-var toHTML = require('./toHTML');
-var toMarkdown = require('./toMarkdown');
-var page = require('./page');
-
-module.exports = HTMLParser.createParser(toHTML, toMarkdown);
-
-// Add the custom page escaping
-module.exports.page.prepare = page.prepare;
diff --git a/packages/gitbook-markdown/lib/toHTML.js b/packages/gitbook-markdown/lib/toHTML.js
deleted file mode 100644
index 9140624..0000000
--- a/packages/gitbook-markdown/lib/toHTML.js
+++ /dev/null
@@ -1,37 +0,0 @@
-var MarkupIt = require('markup-it');
-var markdownSyntax = require('markup-it/syntaxes/markdown');
-var htmlSyntax = require('markup-it/syntaxes/html');
-
-var markdown = new MarkupIt(markdownSyntax);
-var html     = new MarkupIt(htmlSyntax);
-
-/**
- * Convert Markdown block to HTML
- *
- * @param {String} src (markdown)
- * @return {String} (html)
- */
-function convertMdToHTMLBlock(src) {
-    var content  = markdown.toContent(src);
-    var textHtml = html.toText(content);
-
-    return textHtml;
-}
-
-/**
- * Convert Markdown inline to HTML
- *
- * @param {String} src (markdown)
- * @return {String} (html)
- */
-function convertMdToHTMLInline(src) {
-    var content  = markdown.toInlineContent(src);
-    var textHtml = html.toInlineText(content);
-
-    return textHtml;
-}
-
-module.exports = {
-    block: convertMdToHTMLBlock,
-    inline: convertMdToHTMLInline
-};
diff --git a/packages/gitbook-markdown/package.json b/packages/gitbook-markdown/package.json
index 4cf465c..7eb48f8 100644
--- a/packages/gitbook-markdown/package.json
+++ b/packages/gitbook-markdown/package.json
@@ -1,38 +1,24 @@
 {
   "name": "gitbook-markdown",
-  "version": "2.0.1",
+  "version": "4.0.0",
   "homepage": "https://www.gitbook.com",
-  "description": "Parse markdown content for gitbook",
+  "description": "Markdown parser interface for GitBook",
   "main": "lib/index.js",
   "dependencies": {
-    "gitbook-html": "1.3.3",
-    "lodash": "^4.13.1",
+    "gitbook-html": "4.0.0",
     "markdown-escape": "^1.0.1",
-    "markup-it": "^2.2.0 >=2.2.0"
-  },
-  "devDependencies": {
-    "mocha": "^2.5.3"
+    "markup-it": "3.2.0"
   },
   "scripts": {
-    "test": "export TESTING=true; mocha --reporter list --bail"
+    "test": "mocha --reporter list --bail"
   },
   "repository": {
     "type": "git",
-    "url": "https://github.com/GitbookIO/gitbook-markdown.git"
+    "url": "https://github.com/GitbookIO/gitbook.git"
   },
-  "author": "FriendCode Inc. <contact@gitbook.com>",
+  "author": "GitBook Inc. <contact@gitbook.com>",
   "license": "Apache-2.0",
   "bugs": {
-    "url": "https://github.com/GitbookIO/gitbook-markdown/issues"
-  },
-  "contributors": [
-    {
-      "name": "Aaron O'Mullan",
-      "email": "aaron@gitbook.com"
-    },
-    {
-      "name": "Samy Pessé",
-      "email": "samy@gitbook.com"
-    }
-  ]
+    "url": "https://github.com/GitbookIO/gitbook/issues"
+  }
 }
diff --git a/packages/gitbook-markdown/src/index.js b/packages/gitbook-markdown/src/index.js
new file mode 100644
index 0000000..694d8c8
--- /dev/null
+++ b/packages/gitbook-markdown/src/index.js
@@ -0,0 +1,10 @@
+const HTMLParser = require('gitbook-html');
+
+const toHTML = require('./toHTML');
+const toMarkdown = require('./toMarkdown');
+const page = require('./page');
+
+module.exports = HTMLParser.createParser(toHTML, toMarkdown);
+
+// Add the custom page escaping
+module.exports.page.prepare = page.prepare;
diff --git a/packages/gitbook-markdown/lib/page.js b/packages/gitbook-markdown/src/page.js
index 2cf0941..70da324 100644
--- a/packages/gitbook-markdown/lib/page.js
+++ b/packages/gitbook-markdown/src/page.js
@@ -1,10 +1,8 @@
-var _ = require('lodash');
-var MarkupIt = require('markup-it');
-var gitbookSyntax = require('markup-it/syntaxes/markdown');
+const { State } = require('markup-it');
+const markdown = require('markup-it/lib/markdown');
 
-var RAW_START = '{% raw %}';
-var RAW_END   = '{% endraw %}';
-var markdown  = new MarkupIt(gitbookSyntax);
+const RAW_START = '{% raw %}';
+const RAW_END   = '{% endraw %}';
 
 /**
  * Escape a code block's content using raw blocks
@@ -25,19 +23,28 @@ function escape(str) {
  * @return {String}
  */
 function preparePage(src) {
-    var levelRaw = 0;
-    var content  = markdown.toContent(src, {
+    let levelRaw = 0;
+
+    const fromMD = State.create(markdown);
+    const document = fromMD.deserializeToDocument(src);
+
+    document = document.mapDescendants((node) => {
+
+    });
+
+
+    const content  = markdown.toContent(src, {
         math:     true,
         template: true
     });
 
-    var textMarkdown = markdown.toText(content, {
-        annotate: function(state, raw, token) {
-            var tokenType = token.getType();
+    const textMarkdown = markdown.toText(content, {
+        annotate(state, raw, token) {
+            const tokenType = token.getType();
 
             if (tokenType === MarkupIt.ENTITIES.TEMPLATE) {
-                var type = token.getData().get('type');
-                var expr = token.getAsPlainText();
+                const type = token.getData().get('type');
+                const expr = token.getAsPlainText();
 
                 if (type === 'expr') {
                     if (expr === 'raw') {
diff --git a/packages/gitbook-markdown/src/toHTML.js b/packages/gitbook-markdown/src/toHTML.js
new file mode 100644
index 0000000..e887e11
--- /dev/null
+++ b/packages/gitbook-markdown/src/toHTML.js
@@ -0,0 +1,35 @@
+const { State } = require('markup-it');
+const markdown = require('markup-it/lib/markdown');
+const html = require('markup-it/lib/html');
+
+/**
+ * Convert Markdown block to HTML
+ *
+ * @param {String} src (markdown)
+ * @return {String} (html)
+ */
+function convertMdToHTMLBlock(src) {
+    const fromMD = State.create(markdown);
+    const document = fromMD.deserializeToDocument(src);
+
+    const toHTML = State.create(html);
+    return toHTML.serializeDocument(document);
+}
+
+/**
+ * Convert Markdown inline to HTML
+ *
+ * @param {String} src (markdown)
+ * @return {String} (html)
+ */
+function convertMdToHTMLInline(src) {
+    const content  = markdown.toInlineContent(src);
+    const textHtml = html.toInlineText(content);
+
+    return textHtml;
+}
+
+module.exports = {
+    block: convertMdToHTMLBlock,
+    inline: convertMdToHTMLInline
+};
diff --git a/packages/gitbook-markdown/lib/toMarkdown.js b/packages/gitbook-markdown/src/toMarkdown.js
index 71de016..5b8deee 100644
--- a/packages/gitbook-markdown/lib/toMarkdown.js
+++ b/packages/gitbook-markdown/src/toMarkdown.js
@@ -1,4 +1,4 @@
-var escape = require('markdown-escape');
+const escape = require('markdown-escape');
 
 // Return N time a string
 function ns(s, n) {
@@ -10,46 +10,46 @@ function ns(s, n) {
  * These rules are being used to generate SUMMARY/GLOSSARY/LANGS
  */
 module.exports = {
-    onText: function(text) {
+    onText(text) {
         return escape(text);
     },
 
-    onTitleStart: function(level) {
+    onTitleStart(level) {
         return ns('#', level) + ' ';
     },
-    onTitleEnd: function(level) {
+    onTitleEnd(level) {
         return this.onBL();
     },
 
-    onParagraphStart: function() {
+    onParagraphStart() {
         return this.onSection();
     },
-    onParagraphEnd: function() {
+    onParagraphEnd() {
         return this.onSection();
     },
 
-    onLinkStart: function() {
+    onLinkStart() {
         return '[';
     },
-    onLinkEnd: function(href) {
-        return '](' + href +')';
+    onLinkEnd(href) {
+        return '](' + href + ')';
     },
 
-    onListStart: function(level) {
+    onListStart(level) {
         return '';
     },
-    onListEnd: function() {
+    onListEnd() {
         return '';
     },
 
-    onListItemStart: function(level) {
+    onListItemStart(level) {
         return ns(' ', level * 4) + '* ';
     },
-    onListItemEnd: function() {
+    onListItemEnd() {
         return '';
     },
 
-    onHR: function() {
+    onHR() {
         return '-----';
     }
 };
diff --git a/packages/gitbook-markdown/test/glossary.js b/packages/gitbook-markdown/test/glossary.js
index 588859a..b38a78d 100644
--- a/packages/gitbook-markdown/test/glossary.js
+++ b/packages/gitbook-markdown/test/glossary.js
@@ -1,29 +1,28 @@
-var fs = require('fs');
-var path = require('path');
-var assert = require('assert');
+const fs = require('fs');
+const path = require('path');
+const expect = require('assert');
 
-var glossary = require('../').glossary;
+const glossary = require('../src').glossary;
 
-describe('Glossary parsing', function () {
-    var LEXED;
+describe('Glossary', () => {
+    let LEXED;
 
-    before(function() {
-        var CONTENT = fs.readFileSync(path.join(__dirname, './fixtures/GLOSSARY.md'), 'utf8');
+    before(() => {
+        const CONTENT = fs.readFileSync(path.join(__dirname, './fixtures/GLOSSARY.md'), 'utf8');
         LEXED = glossary(CONTENT);
     });
 
-    it('should only get heading + paragraph pairs', function() {
-        assert.equal(LEXED.length, 4);
+    it('should only get heading + paragraph pairs', () => {
+        expect(LEXED.length).toBe(4);
     });
 
-    it('should output simple name/description objects', function() {
-        assert.equal(true, !(LEXED.some(function(e) {
-            return !Boolean(e.name && e.description);
-        })));
+    it('should output simple name/description objects', () => {
+        expect(!(LEXED.some(e => !Boolean(e.name && e.description)))).toBe(true);
     });
 
-    it('should correctly convert it to text', function() {
-        var text = glossary.toText(LEXED);
-        assertObjectsEqual(glossary(text), LEXED);
+    it('should correctly convert it to text', () => {
+        const text = glossary.toText(LEXED);
+        const parsed = glossary(text);
+        expect(parsed).toEqual(LEXED);
     });
 });
diff --git a/packages/gitbook-markdown/test/helper.js b/packages/gitbook-markdown/test/helper.js
deleted file mode 100644
index 1e310f7..0000000
--- a/packages/gitbook-markdown/test/helper.js
+++ /dev/null
@@ -1,6 +0,0 @@
-var assert = require("assert");
-
-global.assertObjectsEqual = function(o1, o2) {
-    assert.equal(JSON.stringify(o1, null, 4), JSON.stringify(o2, null, 4));
-};
-
diff --git a/packages/gitbook-markdown/test/inline.js b/packages/gitbook-markdown/test/inline.js
index 4ed1006..834fd3f 100644
--- a/packages/gitbook-markdown/test/inline.js
+++ b/packages/gitbook-markdown/test/inline.js
@@ -1,11 +1,9 @@
-var fs = require('fs');
-var path = require('path');
-var assert = require('assert');
+const expect = require('expect');
+const inline = require('../src').inline;
 
-var inline = require('../').inline;
-
-describe('Inline', function () {
-    it('should render inline markdown', function() {
-        assert.equal(inline('Hello **World**').content, 'Hello <strong>World</strong>');
+describe('Inline', () => {
+    it('should render inline markdown', () => {
+        const parsed = inline('Hello **World**');
+        expect(parsed.content).toBe('Hello <strong>World</strong>');
     });
 });
diff --git a/packages/gitbook-markdown/test/langs.js b/packages/gitbook-markdown/test/langs.js
index 3c2f108..3986de9 100644
--- a/packages/gitbook-markdown/test/langs.js
+++ b/packages/gitbook-markdown/test/langs.js
@@ -1,28 +1,28 @@
-var fs = require('fs');
-var path = require('path');
-var assert = require('assert');
+const fs = require('fs');
+const path = require('path');
+const expect = require('expect');
+const langs = require('../src').langs;
 
-var langs = require('../').langs;
+describe('Languages', () => {
+    let LEXED;
 
-describe('Languages parsing', function () {
-    var LEXED;
-
-    before(function() {
-        var CONTENT = fs.readFileSync(path.join(__dirname, './fixtures/LANGS.md'), 'utf8');
+    before(() => {
+        const CONTENT = fs.readFileSync(path.join(__dirname, './fixtures/LANGS.md'), 'utf8');
         LEXED = langs(CONTENT);
     });
 
-    it('should detect paths and titles', function() {
-        assert.equal(LEXED.length, 2);
-        assert.equal(LEXED[0].ref,'en/');
-        assert.equal(LEXED[0].title,'English');
+    it('should detect paths and titles', () => {
+        expect(LEXED.length).toEqual(2);
+        expect(LEXED[0].ref).toEqual('en/');
+        expect(LEXED[0].title).toEqual('English');
 
-        assert.equal(LEXED[1].ref,'fr/');
-        assert.equal(LEXED[1].title,'French');
+        expect(LEXED[1].ref).toEqual('fr/');
+        expect(LEXED[1].title).toEqual('French');
     });
 
-    it('should correctly convert it to text', function() {
-        var text = langs.toText(LEXED);
-        assertObjectsEqual(langs(text), LEXED);
+    it('should correctly convert it to text', () => {
+        const text = langs.toText(LEXED);
+        const parsed = langs(text);
+        expect(parsed).toEqual(LEXED);
     });
 });
diff --git a/packages/gitbook-markdown/test/page.js b/packages/gitbook-markdown/test/page.js
index a2e21d1..9ea48f4 100644
--- a/packages/gitbook-markdown/test/page.js
+++ b/packages/gitbook-markdown/test/page.js
@@ -1,74 +1,81 @@
-var fs = require('fs');
-var path = require('path');
-var assert = require('assert');
+const fs = require('fs');
+const path = require('path');
+const expect = require('expect');
 
-var page = require('../').page;
+const page = require('../src').page;
 
-describe('Page parsing', function() {
-    var LEXED;
+describe('Page', () => {
+    let LEXED;
 
-    before(function() {
-        var CONTENT = fs.readFileSync(path.join(__dirname, './fixtures/PAGE.md'), 'utf8');
+    before(() => {
+        const CONTENT = fs.readFileSync(path.join(__dirname, './fixtures/PAGE.md'), 'utf8');
         LEXED = page(CONTENT);
     });
 
-    it('should gen content', function() {
-        assert(LEXED.content);
+    it('should gen content', () => {
+        expect(LEXED.content).toExist();
     });
 
-    it('should not add id to headings', function() {
-        assert.equal(page('# Hello').content, '<h1>Hello</h1>');
-        assert.equal(page('# Hello {#test}').content, '<h1 id="test">Hello</h1>');
+    it('should not add id to headings', () => {
+        expect(page('# Hello').content).toBe('<h1>Hello</h1>');
+        expect(page('# Hello {#test}').content).toBe('<h1 id="test">Hello</h1>');
     });
 
-    it('should escape codeblocks in preparation (1)', function() {
-        assert.equal(page.prepare("Hello `world`"), 'Hello {% raw %}`world`{% endraw %}\n\n');
-        assert.equal(page.prepare("Hello `world test`"), 'Hello {% raw %}`world test`{% endraw %}\n\n');
-        assert.equal(page.prepare("Hello ```world test```"), 'Hello {% raw %}`world test`{% endraw %}\n\n');
-        assert.equal(page.prepare("Hello\n```js\nworld test\n```\n"), 'Hello\n\n{% raw %}```js\nworld test\n```\n\n{% endraw %}');
-        assert.equal(page.prepare("Hello\n```\ntest\n\tworld\n\ttest\n```"), 'Hello\n\n{% raw %}```\ntest\n    world\n    test\n```\n\n{% endraw %}');
+    it('should escape codeblocks in preparation (1)', () => {
+        expect(page.prepare('Hello `world`')).toBe('Hello {% raw %}`world`{% endraw %}\n\n');
+        expect(page.prepare('Hello `world test`')).toBe('Hello {% raw %}`world test`{% endraw %}\n\n');
+        expect(page.prepare('Hello ```world test```')).toBe('Hello {% raw %}`world test`{% endraw %}\n\n');
+        expect(page.prepare('Hello\n```js\nworld test\n```\n')).toBe('Hello\n\n{% raw %}```js\nworld test\n```\n\n{% endraw %}');
+        expect(page.prepare('Hello\n```\ntest\n\tworld\n\ttest\n```')).toBe('Hello\n\n{% raw %}```\ntest\n    world\n    test\n```\n\n{% endraw %}');
     });
 
-    it('should escape codeblocks in preparation (2)', function() {
-        assert.equal(
-            page.prepare("Hello\n\n\n\tworld\n\thello\n\n\ntest"),
+    it('should escape codeblocks in preparation (2)', () => {
+        expect(
+            page.prepare('Hello\n\n\n\tworld\n\thello\n\n\ntest')
+        ).toBe(
             'Hello\n\n{% raw %}```\nworld\nhello```\n\n{% endraw %}test\n\n'
         );
-        assert.equal(
-            page.prepare("Hello\n\n\n\tworld\n\thello\n\n\n"),
+        expect(
+            page.prepare('Hello\n\n\n\tworld\n\thello\n\n\n')
+        ).toBe(
             'Hello\n\n{% raw %}```\nworld\nhello```\n\n{% endraw %}'
         );
     });
 
-    it('should escape codeblocks with nunjucks tags', function() {
-        assert.equal(
-            page.prepare('Hello {{ "Bonjour" }} ```test```'),
+    it('should escape codeblocks with nunjucks tags', () => {
+        expect(
+            page.prepare('Hello {{ "Bonjour" }} ```test```')
+        ).toBe(
             'Hello {{ "Bonjour" }} {% raw %}`test`{% endraw %}\n\n'
         );
     });
 
-    it('should escape codeblocks with nunjucks tags in {% raw %} tags', function() {
-        assert.equal(
-            page.prepare('{% raw %}Hello {{ "Bonjour" }} ```test```{% endraw %}'),
+    it('should escape codeblocks with nunjucks tags in {% raw %} tags', () => {
+        expect(
+            page.prepare('{% raw %}Hello {{ "Bonjour" }} ```test```{% endraw %}')
+        ).toBe(
             '{% raw %}Hello {{ "Bonjour" }} `test`{% endraw %}\n\n'
         );
-        assert.equal(
-            page.prepare('{% raw %}Hello {{ "Bonjour" }} {% raw %}{% endraw %}```test```'),
+        expect(
+            page.prepare('{% raw %}Hello {{ "Bonjour" }} {% raw %}{% endraw %}```test```')
+        ).toBe(
             '{% raw %}Hello {{ "Bonjour" }} {% raw %}{% endraw %}{% raw %}`test`{% endraw %}\n\n'
         );
-        assert.equal(
-            page.prepare('```{% raw %}Hello {{ "Bonjour" }} {% raw %}```'),
+        expect(
+            page.prepare('```{% raw %}Hello {{ "Bonjour" }} {% raw %}```')
+        ).toBe(
             '{% raw %}`{% raw %}Hello {{ "Bonjour" }} {% raw %}`{% endraw %}\n\n'
         );
 
-        assert.equal(
-            page.prepare('```\ntest\n```\n\n\n### Test'),
+        expect(
+            page.prepare('```\ntest\n```\n\n\n### Test')
+        ).toBe(
             '{% raw %}```\ntest\n```\n\n{% endraw %}### Test\n\n'
         );
     });
 
-    it('should not process math', function() {
-        assert.equal(page.prepare("Hello $world$"), 'Hello $world$\n\n');
-        assert.equal(page.prepare("Hello $$world$$"), 'Hello $$world$$\n\n');
+    it('should not process math', () => {
+        expect(page.prepare('Hello $world$')).toBe('Hello $world$\n\n');
+        expect(page.prepare('Hello $$world$$')).toBe('Hello $$world$$\n\n');
     });
 });
diff --git a/packages/gitbook-markdown/test/readme.js b/packages/gitbook-markdown/test/readme.js
index dd059fb..fad9c53 100644
--- a/packages/gitbook-markdown/test/readme.js
+++ b/packages/gitbook-markdown/test/readme.js
@@ -1,30 +1,30 @@
-var fs = require('fs');
-var path = require('path');
-var assert = require('assert');
+const fs = require('fs');
+const path = require('path');
+const expect = require('expect');
 
-var readme = require('../').readme;
+const readme = require('../src').readme;
 
-describe('Readme parsing', function () {
-    var LEXED;
+describe('Readme', () => {
+    let LEXED;
 
-    before(function() {
-        var CONTENT = fs.readFileSync(path.join(__dirname, './fixtures/README.md'), 'utf8');
+    before(() => {
+        const CONTENT = fs.readFileSync(path.join(__dirname, './fixtures/README.md'), 'utf8');
         LEXED = readme(CONTENT);
     });
 
-    it('should contain a title', function() {
-        assert(LEXED.title);
+    it('should contain a title', () => {
+        expect(LEXED.title).toExist();
     });
 
-    it('should contain a description', function() {
-        assert(LEXED.description);
+    it('should contain a description', () => {
+        expect(LEXED.description).toExist();
     });
 
-    it('should extract the right title', function() {
-        assert.equal(LEXED.title, "This is the title");
+    it('should extract the right title', () => {
+        expect(LEXED.title).toBe('This is the title');
     });
 
-    it('should extract the right description', function() {
-        assert.equal(LEXED.description, "This is the book description.");
+    it('should extract the right description', () => {
+        expect(LEXED.description).toBe('This is the book description.');
     });
 });
diff --git a/packages/gitbook-markdown/test/summary.js b/packages/gitbook-markdown/test/summary.js
index 31dbff9..9748500 100644
--- a/packages/gitbook-markdown/test/summary.js
+++ b/packages/gitbook-markdown/test/summary.js
@@ -1,8 +1,8 @@
-var fs = require('fs');
-var path = require('path');
-var assert = require('assert');
+const fs = require('fs');
+const path = require('path');
+const expect = require('expect');
 
-var summary = require('../').summary;
+const summary = require('../src').summary;
 
 function lex(fixtureFile) {
     return summary(
@@ -13,61 +13,62 @@ function lex(fixtureFile) {
     );
 }
 
-describe('Summary parsing', function () {
-    var LEXED;
+describe('Summary', () => {
+    let LEXED, PART;
 
-    before(function() {
+    before(() => {
         LEXED = lex('SUMMARY.md');
         PART = LEXED.parts[0];
     });
 
-    it('should detect chapters', function() {
-        assert.equal(PART.articles.length, 5);
+    it('should detect chapters', () => {
+        expect(PART.articles.length).toBe(5);
     });
 
-    it('should support articles', function() {
-        assert.equal(PART.articles[0].articles.length, 2);
-        assert.equal(PART.articles[1].articles.length, 0);
-        assert.equal(PART.articles[2].articles.length, 0);
+    it('should support articles', () => {
+        expect(PART.articles[0].articles.length).toBe(2);
+        expect(PART.articles[1].articles.length).toBe(0);
+        expect(PART.articles[2].articles.length).toBe(0);
     });
 
-    it('should detect paths and titles', function() {
-        assert(PART.articles[0].ref);
-        assert(PART.articles[1].ref);
-        assert(PART.articles[2].ref);
-        assert(PART.articles[3].ref);
-        assert.equal(PART.articles[4].ref, null);
+    it('should detect paths and titles', () => {
+        expect(PART.articles[0].ref).toExist();
+        expect(PART.articles[1].ref).toExist();
+        expect(PART.articles[2].ref).toExist();
+        expect(PART.articles[3].ref).toExist();
+        expect(PART.articles[4].ref).toNotExist();
 
-        assert(PART.articles[0].title);
-        assert(PART.articles[1].title);
-        assert(PART.articles[2].title);
-        assert(PART.articles[3].title);
-        assert(PART.articles[4].title);
+        expect(PART.articles[0].title).toExist();
+        expect(PART.articles[1].title).toExist();
+        expect(PART.articles[2].title).toExist();
+        expect(PART.articles[3].title).toExist();
+        expect(PART.articles[4].title).toExist();
     });
 
-    it('should normalize paths from .md', function() {
-        assert.equal(PART.articles[0].ref, 'chapter-1/README.md');
-        assert.equal(PART.articles[1].ref, 'chapter-2/README.md');
-        assert.equal(PART.articles[2].ref, 'chapter-3/README.md');
+    it('should normalize paths from .md', () => {
+        expect(PART.articles[0].ref).toBe('chapter-1/README.md');
+        expect(PART.articles[1].ref).toBe('chapter-2/README.md');
+        expect(PART.articles[2].ref).toBe('chapter-3/README.md');
     });
 
-    it('should part parts', function() {
-        var l = lex('SUMMARY_PARTS.md');
-        assert.equal(l.parts.length, 3);
+    it('should part parts', () => {
+        const l = lex('SUMMARY_PARTS.md');
+        expect(l.parts.length).toBe(3);
     });
 
-    it('should allow lists separated by whitespace', function() {
-        var l = lex('SUMMARY_WHITESPACE.md');
-        assert.equal(l.parts[0].articles.length, 5);
+    it('should allow lists separated by whitespace', () => {
+        const l = lex('SUMMARY_WHITESPACE.md');
+        expect(l.parts[0].articles.length).toBe(5);
     });
 
-    it('should allow ignore empty entries', function() {
-        var l = lex('SUMMARY_EMPTY.md');
-        assert.equal(l.parts[0].articles.length, 1);
+    it('should allow ignore empty entries', () => {
+        const l = lex('SUMMARY_EMPTY.md');
+        expect(l.parts[0].articles.length).toBe(1);
     });
 
-    it('should correctly convert it to text', function() {
-        var text = summary.toText(LEXED);
-        assertObjectsEqual(summary(text), LEXED);
+    it('should correctly convert it to text', () => {
+        const text = summary.toText(LEXED);
+        const parsed = summary(text);
+        expect(parsed).toEqual(LEXED);
     });
 });
diff --git a/packages/gitbook/package.json b/packages/gitbook/package.json
index 2266013..07ed9aa 100644
--- a/packages/gitbook/package.json
+++ b/packages/gitbook/package.json
@@ -23,7 +23,7 @@
     "front-matter": "^2.1.0",
     "gitbook-asciidoc": "4.0.0",
     "gitbook-core": "4.0.0",
-    "gitbook-markdown": "1.3.2",
+    "gitbook-markdown": "4.0.0",
     "gitbook-plugin-copy-code": "4.0.0",
     "gitbook-plugin-headings": "4.0.0",
     "gitbook-plugin-highlight": "4.0.0",