perf: avoid double file read

Ref #292

src/core/context.ts

@@ -105,10 +105,11 @@ export function createRoutesContext(options: ResolvedOptions) {
     const content = await fs.readFile(filePath, 'utf8')
     // TODO: cache the result of parsing the SFC so the transform can reuse the parsing
     node.hasDefinePage ||= content.includes('definePage')
-    const [definedPageNameAndPath, routeBlock] = await Promise.all([
-      extractDefinePageNameAndPath(content, filePath),
-      getRouteBlock(filePath, options),
-    ])
+    const definedPageNameAndPath = extractDefinePageNameAndPath(
+      content,
+      filePath
+    )
+    const routeBlock = getRouteBlock(filePath, content, options)
     // TODO: should warn if hasDefinePage and customRouteBlock
     // if (routeBlock) logger.log(routeBlock)
     node.setCustomRouteBlock(filePath, {

src/core/customBlock.ts

@@ -1,15 +1,16 @@
 import { SFCBlock, parse } from '@vue/compiler-sfc'
-import fs from 'node:fs/promises'
 import { ResolvedOptions } from '../options'
 import JSON5 from 'json5'
 import { parse as YAMLParser } from 'yaml'
 import { RouteRecordRaw } from 'vue-router'
 import { warn } from './utils'
 
-export async function getRouteBlock(path: string, options: ResolvedOptions) {
-  const content = await fs.readFile(path, 'utf8')
-
-  const parsedSFC = await parse(content, { pad: 'space' }).descriptor
+export function getRouteBlock(
+  path: string,
+  content: string,
+  options: ResolvedOptions
+) {
+  const parsedSFC = parse(content, { pad: 'space' }).descriptor
   const blockStr = parsedSFC?.customBlocks.find((b) => b.type === 'route')
 
   if (!blockStr) return