fix(build): handle vite constants replacement (#419) (#888)

src/node/markdownToVue.ts

@@ -34,14 +34,7 @@ export async function createMarkdownToVueRenderFn(
 
   pages = pages.map((p) => slash(p.replace(/\.md$/, '')))
 
-  const userDefineRegex = userDefines
+  const replaceRegex = genReplaceRegexp(userDefines, isBuild)
-    ? new RegExp(
-        `\\b(${Object.keys(userDefines)
-          .map((key) => key.replace(/[-[\]/{}()*+?.\\^$|]/g, '\\$&'))
-          .join('|')})`,
-        'g'
-      )
-    : null
 
   return async (
     src: string,
@@ -74,24 +67,9 @@ export async function createMarkdownToVueRenderFn(
     md.__path = file
     md.__relativePath = relativePath
 
-    let html = md.render(content)
+    const html = md.render(content)
     const data = md.__data
 
-    if (isBuild) {
-      // avoid env variables being replaced by vite
-      html = html
-        .replace(/\bimport\.meta/g, 'import.<wbr/>meta')
-        .replace(/\bprocess\.env/g, 'process.<wbr/>env')
-
-      // also avoid replacing vite user defines
-      if (userDefineRegex) {
-        html = html.replace(
-          userDefineRegex,
-          (_) => `${_[0]}<wbr/>${_.slice(1)}`
-        )
-      }
-    }
-
     // validate data.links
     const deadLinks: string[] = []
     const recordDeadLink = (url: string) => {
@@ -149,8 +127,14 @@ export async function createMarkdownToVueRenderFn(
     }
 
     const vueSrc =
-      genPageDataCode(data.hoistedTags || [], pageData).join('\n') +
+      genPageDataCode(data.hoistedTags || [], pageData, replaceRegex).join(
-      `\n<template><div>${html}</div></template>`
+        '\n'
+      ) +
+      `\n<template><div>${replaceConstants(
+        html,
+        replaceRegex,
+        vueTemplateBreaker
+      )}</div></template>`
 
     debug(`[render] ${file} in ${Date.now() - start}ms.`)
 
@@ -171,10 +155,42 @@ const scriptSetupRE = /<\s*script[^>]*\bsetup\b[^>]*/
 const scriptClientRE = /<\s*script[^>]*\bclient\b[^>]*/
 const defaultExportRE = /((?:^|\n|;)\s*)export(\s*)default/
 const namedDefaultExportRE = /((?:^|\n|;)\s*)export(.+)as(\s*)default/
+const jsStringBreaker = '\u200b'
+const vueTemplateBreaker = '<wbr>'
+
+function genReplaceRegexp(
+  userDefines: Record<string, any> = {},
+  isBuild: boolean
+): RegExp {
+  // `process.env` need to be handled in both dev and build
+  // @see https://github.com/vitejs/vite/blob/cad27ee8c00bbd5aeeb2be9bfb3eb164c1b77885/packages/vite/src/node/plugins/clientInjections.ts#L57-L64
+  const replacements = ['process.env']
+  if (isBuild) {
+    replacements.push('import.meta', ...Object.keys(userDefines))
+  }
+  return new RegExp(
+    `\\b(${replacements
+      .map((key) => key.replace(/[-[\]/{}()*+?.\\^$|]/g, '\\$&'))
+      .join('|')})`,
+    'g'
+  )
+}
+
+/**
+ * To avoid env variables being replaced by vite:
+ * - insert `'\u200b'` char into those strings inside js string (page data)
+ * - insert `<wbr>` tag into those strings inside html string (vue template)
+ *
+ * @see https://vitejs.dev/guide/env-and-mode.html#production-replacement
+ */
+function replaceConstants(str: string, replaceRegex: RegExp, breaker: string) {
+  return str.replace(replaceRegex, (_) => `${_[0]}${breaker}${_.slice(1)}`)
+}
 
-function genPageDataCode(tags: string[], data: PageData) {
+function genPageDataCode(tags: string[], data: PageData, replaceRegex: RegExp) {
+  const dataJson = JSON.stringify(data)
   const code = `\nexport const __pageData = JSON.parse(${JSON.stringify(
-    JSON.stringify(data)
+    replaceConstants(dataJson, replaceRegex, jsStringBreaker)
   )})`
 
   const existingScriptIndex = tags.findIndex((tag) => {