refactor plugins to be functions instead of classes

quartz/plugins/transformers/description.ts

@@ -1,4 +1,3 @@
-import { PluggableList } from "unified"
 import { Root as HTMLRoot } from 'hast'
 import { toString } from "hast-util-to-string"
 import { QuartzTransformerPlugin } from "../types"
@@ -11,41 +10,36 @@ const defaultOptions: Options = {
   descriptionLength: 150
 }
 
-export class Description extends QuartzTransformerPlugin {
-  name = "Description"
-  opts: Options
+export const Description: QuartzTransformerPlugin<Partial<Options> | undefined> = (userOpts) => {
+  const opts = { ...defaultOptions, ...userOpts }
+  return {
+    name: "Description",
+    markdownPlugins() {
+      return []
+    },
+    htmlPlugins() {
+      return [
+        () => {
+          return async (tree: HTMLRoot, file) => {
+            const frontMatterDescription = file.data.frontmatter?.description
+            const text = toString(tree)
 
-  constructor(opts?: Partial<Options>) {
-    super()
-    this.opts = { ...defaultOptions, ...opts }
-  }
+            const desc = frontMatterDescription ?? text
+            const sentences = desc.replace(/\s+/g, ' ').split('.')
+            let finalDesc = ""
+            let sentenceIdx = 0
+            const len = opts.descriptionLength
+            while (finalDesc.length < len) {
+              finalDesc += sentences[sentenceIdx] + '.'
+              sentenceIdx++
+            }
 
-  markdownPlugins(): PluggableList {
-    return []
-  }
-
-  htmlPlugins(): PluggableList {
-    return [
-      () => {
-        return async (tree: HTMLRoot, file) => {
-          const frontMatterDescription = file.data.frontmatter?.description
-          const text = toString(tree)
-
-          const desc = frontMatterDescription ?? text
-          const sentences = desc.replace(/\s+/g, ' ').split('.')
-          let finalDesc = ""
-          let sentenceIdx = 0
-          const len = this.opts.descriptionLength
-          while (finalDesc.length < len) {
-            finalDesc += sentences[sentenceIdx] + '.'
-            sentenceIdx++
+            file.data.description = finalDesc
+            file.data.text = text
           }
-
-          file.data.description = finalDesc
-          file.data.text = text
         }
-      }
-    ]
+      ]
+    }
   }
 }