feat: inject default export

Author: meteorlxy

packages/core/src/page/renderPageToVue.ts

@@ -1,4 +1,5 @@
 import { isString } from '@vuepress/shared'
+import { path } from '@vuepress/utils'
 import type { App, Page } from '../types/index.js'
 
 const TEMPLATE_WRAPPER_TAG_OPEN = '<div>'
@@ -10,6 +11,13 @@ const SCRIPT_TAG_CLOSE = '</script>'
 const SCRIPT_TAG_OPEN_LANG_TS_REGEX = /<\s*script[^>]*\blang=['"]ts['"][^>]*/
 const SCRIPT_TAG_OPEN_LANG_TS = '<script lang="ts">'
 
+const SCRIPT_DEFAULT_EXPORT_REGEX = /((?:^|\n|;)\s*)export(\s*)default/
+const SCRIPT_DEFAULT_NAMED_EXPORT_REGEX =
+  /((?:^|\n|;)\s*)export(.+)as(\s*)default/
+
+const SCRIPT_DEFAULT_EXPORT_CODE_TEMPLATE_OUTLET = '__SCRIPT_DEFAULT_EXPORT__'
+const SCRIPT_DEFAULT_EXPORT_CODE_TEMPLATE = `export default { name: ${SCRIPT_DEFAULT_EXPORT_CODE_TEMPLATE_OUTLET} }`
+
 const PAGE_DATA_CODE_VAR_NAME = '_pageData'
 const PAGE_DATA_CODE_TEMPLATE_OUTLET = '__PAGE_DATA__'
 const PAGE_DATA_CODE_TEMPLATE = `export const ${PAGE_DATA_CODE_VAR_NAME} = JSON.parse(${PAGE_DATA_CODE_TEMPLATE_OUTLET})`
@@ -27,37 +35,65 @@ if (import.meta.hot) {
 }
 `
 
-/**
- * Util to resolve the page data code
- */
-const resolvePageDataCode = (data: Page['data']): string =>
-  PAGE_DATA_CODE_TEMPLATE.replace(
-    PAGE_DATA_CODE_TEMPLATE_OUTLET,
-    JSON.stringify(JSON.stringify(data)),
-  )
-
 /**
  * Util to resolve the open tag of script block
  */
-const resolveScriptTagOpen = (sfcBlocks: Page['sfcBlocks']): string => {
+const resolveScriptTagOpen = (page: Page): string => {
   // use existing script open tag
-  if (sfcBlocks.script?.tagOpen) {
-    return sfcBlocks.script.tagOpen
+  if (page.sfcBlocks.script?.tagOpen) {
+    return page.sfcBlocks.script.tagOpen
   }
   // if the setup script block is using typescript, we should use the same language for script block
-  const isUsingTs = sfcBlocks.scriptSetup?.tagOpen.match(
+  const isUsingTs = page.sfcBlocks.scriptSetup?.tagOpen.match(
     SCRIPT_TAG_OPEN_LANG_TS_REGEX,
   )
   return isUsingTs ? SCRIPT_TAG_OPEN_LANG_TS : SCRIPT_TAG_OPEN
 }
 
+/**
+ * Util to resolve the default export code
+ */
+const resolveDefaultExportCode = (page: Page): string =>
+  SCRIPT_DEFAULT_EXPORT_CODE_TEMPLATE.replace(
+    SCRIPT_DEFAULT_EXPORT_CODE_TEMPLATE_OUTLET,
+    JSON.stringify(path.basename(page.chunkFilePath)),
+  )
+
+/**
+ * Util to resolve the page data code
+ */
+const resolvePageDataCode = (page: Page): string =>
+  PAGE_DATA_CODE_TEMPLATE.replace(
+    PAGE_DATA_CODE_TEMPLATE_OUTLET,
+    JSON.stringify(JSON.stringify(page.data)),
+  )
+
+/**
+ * Resolve the stripped content of script block
+ */
+const resolveScriptContentStripped = (app: App, page: Page): string => {
+  const rawContentStripped = page.sfcBlocks.script?.contentStripped
+  const hasDefaultExport = rawContentStripped
+    ? SCRIPT_DEFAULT_EXPORT_REGEX.test(rawContentStripped) ||
+      SCRIPT_DEFAULT_NAMED_EXPORT_REGEX.test(rawContentStripped)
+    : false
+  return [
+    rawContentStripped,
+    resolvePageDataCode(page), // inject page data code
+    !hasDefaultExport && resolveDefaultExportCode(page), // inject default export with component name
+    app.env.isDev && HMR_CODE, // inject HMR code in dev mode
+  ]
+    .filter(isString)
+    .join('\n')
+}
+
 /**
  * Render page to vue component
  */
-export const renderPageToVue = (
-  app: App,
-  { data, sfcBlocks }: Page,
-): string => {
+export const renderPageToVue = (app: App, page: Page): string => {
+  const { sfcBlocks } = page
+
+  // get the content of template block
   // #688: wrap the content of `<template>` with a `<div>` to avoid some potential issues of fragment component
   const templateContent =
     sfcBlocks.template &&
@@ -69,14 +105,10 @@ export const renderPageToVue = (
       sfcBlocks.template.tagClose,
     ].join('')
 
-  // inject page data code and HMR code into the script content
-  const scriptTagOpen = resolveScriptTagOpen(sfcBlocks)
-  const pageDataCode = resolvePageDataCode(data)
+  // get the content of script block
   const scriptContent = [
-    scriptTagOpen,
-    sfcBlocks.script?.contentStripped,
-    pageDataCode,
-    app.env.isDev && HMR_CODE,
+    resolveScriptTagOpen(page),
+    resolveScriptContentStripped(app, page),
     sfcBlocks.script?.tagClose ?? SCRIPT_TAG_CLOSE,
   ]
     .filter(isString)