feat(mkdist): emit .d.vue.ts as type declaration of .vue files

src/plugins/mkdist.ts

@@ -1,7 +1,9 @@
 import type { LoaderFile } from '../block-loader/types'
 import type { VueSFCTransformerFileLoader } from '../sfc-transformer'
 import type { Loader } from '../types/mkdist'
-import { resolve } from 'node:path'
+import { readFileSync } from 'node:fs'
+import { createRequire } from 'node:module'
+import { join, resolve } from 'node:path'
 import { scriptLoader } from '../block-loader/script'
 import { styleLoader } from '../block-loader/style'
 import { templateLoader } from '../block-loader/template'
@@ -19,6 +21,29 @@ function importEsbuild(): Promise<typeof import('esbuild')> | typeof import('esb
   })()
 }
 
+let _isMkdistSupportDualVueDts: boolean | undefined
+function isMkdistSupportDualVueDts(): boolean {
+  if (typeof _isMkdistSupportDualVueDts === 'boolean') {
+    return _isMkdistSupportDualVueDts
+  }
+  try {
+    const require = createRequire(import.meta.url)
+    const mkdistPath = require.resolve('mkdist').replace(/\\/g, '/')
+    const lastNodeModules = mkdistPath.lastIndexOf('/mkdist/')
+    const withoutDist = lastNodeModules !== -1 ? mkdistPath.slice(0, lastNodeModules) : mkdistPath
+    const packageJson = readFileSync(join(withoutDist, 'mkdist/package.json'), 'utf-8')
+    const { version = '0.0.0' } = JSON.parse(packageJson) as { version: string }
+    const [major = 0, minor = 0, patch = 0] = version.split('.').map(n => Number.parseInt(n))
+    const normalizedVersion = major * 1_000_000 + minor * 1_000 + patch
+
+    return !Number.isNaN(normalizedVersion) && normalizedVersion > 2_003_000
+  }
+  catch (error) {
+    console.error(`Error checking mkdist version: ${error}`)
+    return false
+  }
+}
+
 const vueSFCTransformer = defineVueSFCTransformer({
   blockLoaders: {
     template: templateLoader,
@@ -77,6 +102,15 @@ export const vueLoader: Loader = async (input, mkdistContext) => {
     extension: '.js',
     getContents: () => 'export default {}',
   }))?.filter(f => f.declaration) || []
+  if (dts.length && isMkdistSupportDualVueDts()) {
+    dts.push({
+      contents: await input.getContents(),
+      path: input.path,
+      srcPath: input.srcPath,
+      extension: '.d.vue.ts',
+      declaration: true,
+    })
+  }
 
   return [
     {

test/mkdist.test.ts

@@ -234,6 +234,15 @@ describe('transform typescript script setup', () => {
       const msg = 1
       </script>`
 
+    expect(await legacyDeclaration(src)).toMatchInlineSnapshot(`
+      "declare const _default: import("vue").DefineComponent<{
+          msg: string;
+      }, {}, {}, {}, {}, import("vue").ComponentOptionsMixin, import("vue").ComponentOptionsMixin, {}, string, import("vue").PublicProps, Readonly<{
+          msg: string;
+      }> & Readonly<{}>, {}, {}, {}, {}, string, import("vue").ComponentProvideOptions, false, {}, any>;
+      export default _default;
+      "
+    `)
     expect(await declaration(src)).toMatchInlineSnapshot(`
       "declare const _default: import("vue").DefineComponent<{
           msg: string;
@@ -245,6 +254,11 @@ describe('transform typescript script setup', () => {
     `)
 
     expect(await fixture(`<template><div /></template>`)).toMatchInlineSnapshot(`"<template><div /></template>"`)
+    expect(await legacyDeclaration(`<template><div /></template>`)).toMatchInlineSnapshot(`
+      "declare const _default: import("vue").DefineComponent<{}, {}, {}, {}, {}, import("vue").ComponentOptionsMixin, import("vue").ComponentOptionsMixin, {}, string, import("vue").PublicProps, Readonly<{}> & Readonly<{}>, {}, {}, {}, {}, string, import("vue").ComponentProvideOptions, true, {}, any>;
+      export default _default;
+      "
+    `)
     expect(await declaration(`<template><div /></template>`)).toMatchInlineSnapshot(`
       "declare const _default: import("vue").DefineComponent<{}, {}, {}, {}, {}, import("vue").ComponentOptionsMixin, import("vue").ComponentOptionsMixin, {}, string, import("vue").PublicProps, Readonly<{}> & Readonly<{}>, {}, {}, {}, {}, string, import("vue").ComponentProvideOptions, true, {}, any>;
       export default _default;
@@ -424,11 +438,18 @@ describe('transform typescript script setup', () => {
     return await readFile(join(tmpDir, 'dist/index.vue'), 'utf-8')
   }
 
-  async function declaration(src: string): Promise<string | undefined> {
+  async function legacyDeclaration(src: string): Promise<string | undefined> {
     await rm(tmpDir, { force: true, recursive: true })
     await mkdir(join(tmpDir, 'src'), { recursive: true })
     await writeFile(join(tmpDir, 'src/index.vue'), src)
     await mkdist({ declaration: true, loaders: ['js', vueLoader], rootDir: tmpDir })
     return await readFile(join(tmpDir, 'dist/index.vue.d.ts'), 'utf-8').catch(() => undefined)
   }
+  async function declaration(src: string): Promise<string | undefined> {
+    await rm(tmpDir, { force: true, recursive: true })
+    await mkdir(join(tmpDir, 'src'), { recursive: true })
+    await writeFile(join(tmpDir, 'src/index.vue'), src)
+    await mkdist({ declaration: true, loaders: ['js', vueLoader], rootDir: tmpDir })
+    return await readFile(join(tmpDir, 'dist/index.d.vue.ts'), 'utf-8').catch(() => undefined)
+  }
 })