feat(nuxt): handle nuxt route injection for this.$route (#27313)

packages/nuxt/src/pages/plugins/route-injection.ts

@@ -1,10 +1,13 @@
 import { createUnplugin } from 'unplugin'
 import MagicString from 'magic-string'
 import type { Nuxt } from '@nuxt/schema'
+import { stripLiteral } from 'strip-literal'
 import { isVue } from '../../core/utils'
 
-const INJECTION_RE = /\b_ctx\.\$route\b/g
+const INJECTION_RE_TEMPLATE = /\b_ctx\.\$route\b/g
-const INJECTION_SINGLE_RE = /\b_ctx\.\$route\b/
+const INJECTION_RE_SCRIPT = /\bthis\.\$route\b/g
+
+const INJECTION_SINGLE_RE = /\bthis\.\$route\b|\b_ctx\.\$route\b/
 
 export const RouteInjectionPlugin = (nuxt: Nuxt) => createUnplugin(() => {
   return {
@@ -14,14 +17,30 @@ export const RouteInjectionPlugin = (nuxt: Nuxt) => createUnplugin(() => {
       return isVue(id, { type: ['template', 'script'] })
     },
     transform (code) {
-      if (!INJECTION_SINGLE_RE.test(code) || code.includes('_ctx._.provides[__nuxt_route_symbol')) { return }
+      if (!INJECTION_SINGLE_RE.test(code) || code.includes('_ctx._.provides[__nuxt_route_symbol') || code.includes('this._.provides[__nuxt_route_symbol')) { return }
 
       let replaced = false
       const s = new MagicString(code)
-      s.replace(INJECTION_RE, () => {
+      const strippedCode = stripLiteral(code)
-        replaced = true
+
-        return '(_ctx._.provides[__nuxt_route_symbol] || _ctx.$route)'
+      // Local helper function for regex-based replacements using `strippedCode`
-      })
+      const replaceMatches = (regExp: RegExp, replacement: string) => {
+        for (const match of strippedCode.matchAll(regExp)) {
+          const start = match.index!
+          const end = start + match[0].length
+          s.overwrite(start, end, replacement)
+          if (!replaced) {
+            replaced = true
+          }
+        }
+      }
+
+      // handles `$route` in template
+      replaceMatches(INJECTION_RE_TEMPLATE, '(_ctx._.provides[__nuxt_route_symbol] || _ctx.$route)')
+
+      // handles `this.$route` in script
+      replaceMatches(INJECTION_RE_SCRIPT, '(this._.provides[__nuxt_route_symbol] || this.$route)')
+
       if (replaced) {
         s.prepend('import { PageRouteSymbol as __nuxt_route_symbol } from \'#app/components/injections\';\n')
       }

packages/nuxt/test/route-injection.test.ts

@@ -0,0 +1,73 @@
+import { describe, expect, it } from 'vitest'
+import { compileScript, compileTemplate, parse } from '@vue/compiler-sfc'
+import type { Plugin } from 'vite'
+import type { Nuxt } from '@nuxt/schema'
+
+import { RouteInjectionPlugin } from '../src/pages/plugins/route-injection'
+
+describe('route-injection:transform', () => {
+  const injectionPlugin = RouteInjectionPlugin({ options: { sourcemap: { client: false, server: false } } } as Nuxt).raw({}, { framework: 'rollup' }) as Plugin
+
+  const transform = async (source: string) => {
+    const result = await (injectionPlugin.transform! as Function).call({ error: null, warn: null } as any, source, 'test.vue')
+    const code: string = typeof result === 'string' ? result : result?.code
+    let depth = 0
+    return code.split('\n').map((l) => {
+      l = l.trim()
+      if (l.match(/^[}\]]/)) { depth-- }
+      const res = ''.padStart(depth * 2, ' ') + l
+      if (l.match(/[{[]$/)) { depth++ }
+      return res
+    }).join('\n')
+  }
+
+  it('should correctly inject route in template', async () => {
+    const sfc = `<template>{{ $route.path }}</template>`
+    const res = compileTemplate({
+      filename: 'test.vue',
+      id: 'test.vue',
+      source: sfc,
+    })
+    const transformResult = await transform(res.code)
+    expect(transformResult).toMatchInlineSnapshot(`
+      "import { PageRouteSymbol as __nuxt_route_symbol } from '#app/components/injections';
+      import { toDisplayString as _toDisplayString, createTextVNode as _createTextVNode, openBlock as _openBlock, createElementBlock as _createElementBlock } from "vue"
+
+      export function render(_ctx, _cache) {
+        return (_openBlock(), _createElementBlock("template", null, [
+          _createTextVNode(_toDisplayString((_ctx._.provides[__nuxt_route_symbol] || _ctx.$route).path), 1 /* TEXT */)
+        ]))
+      }"
+    `)
+  })
+
+  it('should correctly inject route in options api', async () => {
+    const sfc = `
+      <template>{{ thing }}</template>
+      <script>
+      export default {
+        computed: {
+          thing () {
+            return this.$route.path
+          }
+        }
+      }
+      </script>
+    `
+
+    const res = compileScript(parse(sfc).descriptor, { id: 'test.vue' })
+    const transformResult = await transform(res.content)
+    expect(transformResult).toMatchInlineSnapshot(`
+      "import { PageRouteSymbol as __nuxt_route_symbol } from '#app/components/injections';
+
+      export default {
+        computed: {
+          thing () {
+            return (this._.provides[__nuxt_route_symbol] || this.$route).path
+          }
+        }
+      }
+      "
+    `)
+  })
+})