fix: replacing optional graph arr with graph file path

Author: hutchgrant

Diff for: readme.md

@@ -117,19 +117,19 @@ customElements.define('eve-app', AppComponent);
 
 ## Advanced Options
 
-If you want to pre-scaffold an application with a graph of all md files paths and add your own generated labels(removing the need to cite label in each of the file's front-matter), you can create a graph object then add it to to the options of the loader e.g.
+If you want to pre-scaffold an application with a graph of all md files paths and add your own generated labels(removing the need to cite label in each of the file's front-matter), you can create a graph array, write the serialized json to a cache file, then add the path of that .json file to the options of the loader e.g.
 
-graph object:
+graph.json file:
 
 ```js
-const graph = [
+[
   {
-    filePath: '/home/user/workspace/app/src/pages/mypage.md'
-    label: 'some-generated-label-asjhfkawa'
+    "filePath": "/home/user/workspace/app/src/pages/mypage.md"
+    "label": "some-generated-label-asjhfkawa"
   },
   {
-    filePath: '/home/user/workspace/app/src/pages/myotherpage.md'
-    label: 'some-generated-label-jkhkdsfskwad'
+    "filePath": "/home/user/workspace/app/src/pages/myotherpage.md"
+    "label": "some-generated-label-jkhkdsfskwad"
   }
 ]
 ```
@@ -143,7 +143,7 @@ module: {
       test: /\.md$/,
       loader: 'wc-markdown-loader',
       options: {
-        graph
+        graph: path.join(__dirname, 'graph.json')
       }
     }
   ]

Diff for: src/index.js

@@ -1,5 +1,6 @@
 'use strict';
 
+const fs = require('fs');
 const { getOptions } = require('loader-utils');
 const validateOptions = require('schema-utils');
 const build = require('./build.js');
@@ -18,7 +19,8 @@ module.exports = async function loader(content) {
   validateOptions(schema, options, 'wc-markdown-loader');
 
   if (Object.keys(options).length > 0 && options.graph.length > 0) {
-    elementLabel = options.graph.filter(page => page.filePath === this.resourcePath)[0].label;
+    const graph = JSON.parse(fs.readFileSync(options.graph, 'utf8'));
+    elementLabel = graph.filter(page => page.filePath === this.resourcePath)[0].label;
   }
   parser.parse(content)
     .then(markdown => build(markdown, elementLabel))

Diff for: src/options.json

@@ -2,11 +2,11 @@
   "type": "object",
   "properties": {
     "graph": {
-      "type": [ "array" ]
+      "type": [ "string" ]
     }
   },
   "errorMessage": {
-    "test": "should be {array})"
+    "test": "should be {string})"
   },
   "additionalProperties": false
 }