feat: introduce dumpComponentsInfo option (#830)

Author: ilyaliao

Diff for: .gitignore

@@ -2,4 +2,5 @@ node_modules
 .DS_Store
 dist
 .idea
+.components-info.json
 components.d.ts

Diff for: examples/vite-vue2/vite.config.ts

@@ -8,6 +8,7 @@ const config: UserConfig = {
     Components({
       transformer: 'vue2',
       dts: 'src/components.d.ts',
+      dumpComponentsInfo: true,
     }),
   ],
   build: {

Diff for: examples/vite-vue3/vite.config.ts

@@ -37,6 +37,7 @@ const config: UserConfig = {
           componentPrefix: 'i',
         }),
       ],
+      dumpComponentsInfo: true,
     }),
   ],
   build: {

Diff for: src/core/context.ts

@@ -6,7 +6,7 @@ import process from 'node:process'
 import { slash, throttle, toArray } from '@antfu/utils'
 import Debug from 'debug'
 import { DIRECTIVE_IMPORT_PREFIX } from './constants'
-import { writeDeclaration } from './declaration'
+import { writeComponentsJson, writeDeclaration } from './declaration'
 import { searchComponents } from './fs/glob'
 import { resolveOptions } from './options'
 import transformer from './transformer'
@@ -34,13 +34,24 @@ export class Context {
   root = process.cwd()
   sourcemap: string | boolean = true
   alias: Record<string, string> = {}
+  dumpComponentsInfoPath: string | undefined
 
   constructor(
     private rawOptions: Options,
   ) {
     this.options = resolveOptions(rawOptions, this.root)
     this.sourcemap = rawOptions.sourcemap ?? true
     this.generateDeclaration = throttle(500, this._generateDeclaration.bind(this), { noLeading: false })
+
+    if (this.options.dumpComponentsInfo) {
+      const dumpComponentsInfo = this.options.dumpComponentsInfo === true
+        ? './.components-info.json'
+        : this.options.dumpComponentsInfo ?? false
+
+      this.dumpComponentsInfoPath = dumpComponentsInfo
+      this.generateComponentsJson = throttle(500, this._generateComponentsJson.bind(this), { noLeading: false })
+    }
+
     this.setTransformer(this.options.transformer)
   }
 
@@ -169,6 +180,7 @@ export class Context {
 
   onUpdate(path: string) {
     this.generateDeclaration()
+    this.generateComponentsJson()
 
     if (!this._server)
       return
@@ -288,14 +300,26 @@ export class Context {
     if (!this.options.dts)
       return
 
-    debug.declaration('generating')
+    debug.declaration('generating dts')
     return writeDeclaration(this, this.options.dts, removeUnused)
   }
 
   generateDeclaration(removeUnused = !this._server): void {
     this._generateDeclaration(removeUnused)
   }
 
+  _generateComponentsJson(removeUnused = !this._server) {
+    if (!Object.keys(this._componentNameMap).length)
+      return
+
+    debug.components('generating components-info')
+    return writeComponentsJson(this, removeUnused)
+  }
+
+  generateComponentsJson(removeUnused = !this._server): void {
+    this._generateComponentsJson(removeUnused)
+  }
+
   get componentNameMap() {
     return this._componentNameMap
   }

Diff for: src/core/declaration.ts

@@ -156,3 +156,22 @@ export async function writeDeclaration(ctx: Context, filepath: string, removeUnu
   if (code !== originalContent)
     await writeFile(filepath, code)
 }
+
+export async function writeComponentsJson(ctx: Context, _removeUnused = false) {
+  if (!ctx.dumpComponentsInfoPath)
+    return
+
+  const components = [
+    ...Object.entries({
+      ...ctx.componentNameMap,
+      ...ctx.componentCustomMap,
+    }).map(([_, { name, as, from }]) => ({
+      name: name || 'default',
+      as,
+      from,
+    })),
+    ...resolveTypeImports(ctx.options.types),
+  ]
+
+  await writeFile(ctx.dumpComponentsInfoPath, JSON.stringify(components, null, 2))
+}

Diff for: src/core/unplugin.ts

@@ -48,6 +48,7 @@ export default createUnplugin<Options>((options = {}) => {
       try {
         const result = await ctx.transform(code, id)
         ctx.generateDeclaration()
+        ctx.generateComponentsJson()
         return result
       }
       catch (e) {
@@ -69,6 +70,11 @@ export default createUnplugin<Options>((options = {}) => {
             ctx.generateDeclaration()
         }
 
+        if (ctx.options.dumpComponentsInfo && ctx.dumpComponentsInfoPath) {
+          if (!existsSync(ctx.dumpComponentsInfoPath))
+            ctx.generateComponentsJson()
+        }
+
         if (config.build.watch && config.command === 'build')
           ctx.setupWatcher(chokidar.watch(ctx.options.globs))
       },

Diff for: src/types.ts

@@ -205,6 +205,16 @@ export interface Options {
    * @default true
    */
   sourcemap?: boolean
+
+  /**
+   * Save component information into a JSON file for other tools to consume.
+   * Provide a filepath to save the JSON file.
+   *
+   * When set to `true`, it will save to `./.components-info.json`
+   *
+   * @default false
+   */
+  dumpComponentsInfo?: boolean | string
 }
 
 export type ResolvedOptions = Omit<