Pass a vfile to the transformer

It’s not used by remark-mermaidjs (yet), but unified plugins do expect
it.

Author: remcohaszing

index.js

@@ -1,5 +1,11 @@
-module.exports = async ({ markdownAST }, options) => {
+module.exports = async ({ markdownAST, markdownNode }, options) => {
+  const { VFile } = await import('vfile')
   const { default: plugin } = await import('remark-mermaidjs')
+
+  const vfile = new VFile({
+    value: markdownNode.rawMarkdownBody,
+    path: markdownNode.fileAbsolutePath
+  })
   const transformer = plugin(options)
-  return transformer(markdownAST)
+  return transformer(markdownAST, vfile)
 }

package-lock.json

@@ -27,7 +27,8 @@
     "diagram"
   ],
   "dependencies": {
-    "remark-mermaidjs": "^4.0.0"
+    "remark-mermaidjs": "^4.0.0",
+    "vfile": "^5.0.0"
   },
   "devDependencies": {
     "prettier": "^2.0.0"