refactor plugins to be functions instead of classes

quartz/plugins/filters/draft.ts

@@ -1,10 +1,9 @@
 import { QuartzFilterPlugin } from "../types"
-import { ProcessedContent } from "../vfile"
 
-export class RemoveDrafts extends QuartzFilterPlugin {
-  name = "RemoveDrafts"
-  shouldPublish([_tree, vfile]: ProcessedContent): boolean {
+export const RemoveDrafts: QuartzFilterPlugin<{}> = () => ({
+  name: "RemoveDrafts",
+  shouldPublish([_tree, vfile]) {
     const draftFlag: boolean = vfile.data?.frontmatter?.draft ?? false
     return !draftFlag
   }
-}
+})

quartz/plugins/filters/explicit.ts

@@ -1,10 +1,9 @@
 import { QuartzFilterPlugin } from "../types"
-import { ProcessedContent } from "../vfile"
 
-export class ExplicitPublish extends QuartzFilterPlugin {
-  name = "ExplicitPublish"
-  shouldPublish([_tree, vfile]: ProcessedContent): boolean {
+export const ExplicitPublish: QuartzFilterPlugin = () => ({
+  name: "ExplicitPublish",
+  shouldPublish([_tree, vfile]) {
     const publishFlag: boolean = vfile.data?.frontmatter?.publish ?? false
     return publishFlag
   }
-}
+})