refactor: move emit from callback to helper file function (#704)

* Change emit from callback to helpers file function

* Update docs, remove commented code, improve type sig

quartz/processors/emit.ts

@@ -1,10 +1,6 @@
-import path from "path"
-import fs from "fs"
 import { PerfTimer } from "../util/perf"
 import { getStaticResourcesFromPlugins } from "../plugins"
-import { EmitCallback } from "../plugins/types"
 import { ProcessedContent } from "../plugins/vfile"
-import { FilePath, joinSegments } from "../util/path"
 import { QuartzLogger } from "../util/log"
 import { trace } from "../util/trace"
 import { BuildCtx } from "../util/ctx"
@@ -15,19 +11,12 @@ export async function emitContent(ctx: BuildCtx, content: ProcessedContent[]) {
   const log = new QuartzLogger(ctx.argv.verbose)
 
   log.start(`Emitting output files`)
-  const emit: EmitCallback = async ({ slug, ext, content }) => {
-    const pathToPage = joinSegments(argv.output, slug + ext) as FilePath
-    const dir = path.dirname(pathToPage)
-    await fs.promises.mkdir(dir, { recursive: true })
-    await fs.promises.writeFile(pathToPage, content)
-    return pathToPage
-  }
 
   let emittedFiles = 0
   const staticResources = getStaticResourcesFromPlugins(ctx)
   for (const emitter of cfg.plugins.emitters) {
     try {
-      const emitted = await emitter.emit(ctx, content, staticResources, emit)
+      const emitted = await emitter.emit(ctx, content, staticResources)
       emittedFiles += emitted.length
 
       if (ctx.argv.verbose) {