feat($core): Improve VuePress build time

packages/@vuepress/core/lib/node/Page.js

@@ -286,13 +286,20 @@ module.exports = class Page {
    */
 
   async enhance (enhancers) {
-    for (const { name: pluginName, value: enhancer } of enhancers) {
-      try {
-        await enhancer(this)
-      } catch (error) {
-        console.log(error)
-        throw new Error(`[${pluginName}] execute extendPageData failed.`)
-      }
-    }
+    const enhancerPromises = enhancers.map(({ value: enhancer, name: pluginName }) => {
+      const enhancerResult = enhancer(this)
+      const promise = enhancerResult instanceof Promise ? enhancerResult : Promise.resolve(enhancerResult)
+
+      return promise.catch(e => {
+        console.log(e)
+        return new Error(`[${pluginName}] execute extendPageData failed.`)
+      })
+    })
+
+    const results = await Promise.all(enhancerPromises)
+    const enhancerError = results.find(result => result instanceof Error)
+    if (enhancerError) throw enhancerError
+
+    return results
   }
 }

packages/@vuepress/core/lib/node/__tests__/prepare/Page.spec.js

@@ -111,11 +111,11 @@ describe('Page', () => {
       page = new Page({ path: '/' }, app)
       enhancers = [
         {
-          pluginName: 'foo',
+          name: 'foo',
           value: jest.fn()
         },
         {
-          pluginName: 'foo',
+          name: 'bar',
           value: jest.fn()
         }
       ]
@@ -130,21 +130,22 @@ describe('Page', () => {
 
     test('should loop over sync and async enhancers', async () => {
       const mixedEnhancers = [...enhancers, {
-        pluginName: 'blog',
+        name: 'blog',
         value: jest.fn().mockResolvedValue({})
       }]
       await page.enhance(mixedEnhancers)
 
       return mixedEnhancers.map(enhancer => expect(enhancer.value).toHaveBeenCalled())
     })
 
-    test('should log when enhancing when failing', async () => {
+    test('should log and throw an error when enhancing fails', async () => {
       const error = { errorMessage: 'this is an error message' }
+      const pluginName = 'error-plugin'
 
       await expect(page.enhance([{
-        pluginName: 'error-plugin',
+        name: pluginName,
         value: jest.fn().mockRejectedValue(error)
-      }])).rejects.toThrow()
+      }])).rejects.toThrowError(`[${pluginName}] execute extendPageData failed.`)
 
       expect(console.log).toHaveBeenCalledWith(error)
     })

packages/@vuepress/core/lib/node/build/index.js

@@ -89,11 +89,13 @@ module.exports = class Build extends EventEmitter {
     // render pages
     logger.wait('Rendering static HTML...')
 
-    const pagePaths = []
+    const pagePathsPromises = []
     for (const page of this.context.pages) {
-      pagePaths.push(await this.renderPage(page))
+      pagePathsPromises.push(this.renderPage(page))
     }
 
+    const pagePaths = await Promise.all(pagePathsPromises)
+
     readline.clearLine(process.stdout, 0)
     readline.cursorTo(process.stdout, 0)
 
@@ -134,9 +136,6 @@ module.exports = class Build extends EventEmitter {
 
   async renderPage (page) {
     const pagePath = decodeURIComponent(page.path)
-    readline.clearLine(process.stdout, 0)
-    readline.cursorTo(process.stdout, 0)
-    process.stdout.write(`Rendering page: ${pagePath}`)
 
     // #565 Avoid duplicate description meta at SSR.
     const meta = (page.frontmatter && page.frontmatter.meta || []).filter(item => item.name !== 'description')