tools: add mock-y js-yaml dependency to doctool

Add a hack js-yaml module to the doctool dependencies that simply
loads the one that’s included with eslint.

This helps avoiding to check in the whole dependency tree into
the core repo.

PR-URL: https://github.com/nodejs/node/pull/6495
Reviewed-By: Robert Jefe Lindstaedt <robert.lindstaedt@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>

tools/doc/node_modules/js-yaml/index.js

@@ -0,0 +1,15 @@
+'use strict';
+
+// Hack to load the js-yaml module from eslint.
+// No other reason than that it’s huge.
+
+const path = require('path');
+
+const realJSYaml = path.resolve(
+  __dirname, '..', '..', '..', // tools/
+  'eslint',
+  'node_modules',
+  'js-yaml'
+);
+
+module.exports = require(realJSYaml);

tools/doc/package.json

@@ -7,7 +7,8 @@
     "node": ">=0.6.10"
   },
   "dependencies": {
-    "marked": "~0.1.9"
+    "marked": "~0.1.9",
+    "js-yaml": "^3.5.2"
   },
   "devDependencies": {},
   "optionalDependencies": {},