feat: gzip html reporter's metadata

packages/ui/client/composables/client/static.ts

@@ -2,6 +2,7 @@ import type { BirpcReturn } from 'birpc'
 import type { VitestClient } from '@vitest/ws-client'
 import type { WebSocketHandlers } from 'vitest/src/api/types'
 import { parse } from 'flatted'
+import { decompressSync, strFromU8 } from 'fflate'
 import type { File, ModuleGraphData, ResolvedConfig } from 'vitest/src/types'
 import { StateManager } from '../../../../vitest/src/node/state'
 
@@ -72,7 +73,15 @@ export function createStaticClient(): VitestClient {
 
   async function registerMetadata() {
     const res = await fetch(window.METADATA_PATH!)
-    metadata = parse(await res.text()) as HTMLReportMetadata
+    const contentType = res.headers.get('content-type')?.toLowerCase() || ''
+    if (contentType.includes('application/gzip')) {
+      const compressed = new Uint8Array(await res.arrayBuffer())
+      const decompressed = strFromU8(decompressSync(compressed))
+      metadata = parse(decompressed) as HTMLReportMetadata
+    }
+    else {
+      metadata = parse(await res.text()) as HTMLReportMetadata
+    }
     const event = new Event('open')
     ctx.ws.dispatchEvent(event)
   }

packages/ui/node/reporter.ts

@@ -1,5 +1,7 @@
 import { promises as fs } from 'node:fs'
 import { fileURLToPath } from 'node:url'
+import { promisify } from 'node:util'
+import { gzip, constants as zlibConstants } from 'node:zlib'
 import { basename, dirname, relative, resolve } from 'pathe'
 import c from 'picocolors'
 import fg from 'fast-glob'
@@ -48,11 +50,15 @@ export default class HTMLReporter implements Reporter {
     const htmlFileName = basename(htmlFile)
     const htmlDir = resolve(this.ctx.config.root, dirname(htmlFile))
 
-    const metaFile = resolve(htmlDir, 'html.meta.json')
+    const metaFile = resolve(htmlDir, 'html.meta.json.gz')
 
     await fs.mkdir(resolve(htmlDir, 'assets'), { recursive: true })
 
-    await fs.writeFile(metaFile, report, 'utf-8')
+    const promiseGzip = promisify(gzip)
+    const data = await promiseGzip(report, {
+      level: zlibConstants.Z_BEST_COMPRESSION,
+    })
+    await fs.writeFile(metaFile, data, 'base64')
     const ui = resolve(distDir, 'client')
     // copy ui
     const files = fg.sync('**/*', { cwd: ui })

packages/ui/package.json

@@ -41,6 +41,7 @@
   "dependencies": {
     "@vitest/utils": "workspace:*",
     "fast-glob": "^3.2.12",
+    "fflate": "^0.7.4",
     "flatted": "^3.2.7",
     "pathe": "^1.1.0",
     "picocolors": "^1.0.0",

packages/ui/vite.config.ts

@@ -65,7 +65,7 @@ export const config: UserConfig = {
       name: 'debug-html-report',
       apply: 'serve',
       transformIndexHtml(html) {
-        return html.replace('<!-- !LOAD_METADATA! -->', `<script>window.METADATA_PATH="${debugLink}/html.meta.json"</script>`)
+        return html.replace('<!-- !LOAD_METADATA! -->', `<script>window.METADATA_PATH="${debugLink}/html.meta.json.gz"</script>`)
       },
     },
   ],

test/reporters/tests/html.test.ts

@@ -1,4 +1,5 @@
 import fs from 'fs'
+import zlib from 'zlib'
 import { resolve } from 'pathe'
 import { execa } from 'execa'
 import { describe, expect, it } from 'vitest'
@@ -21,7 +22,8 @@ describe.skipIf(skip)('html reporter', async () => {
       },
       stdio: 'inherit',
     }).catch(e => e)
-    const metaJson = fs.readFileSync(resolve(root, `${basePath}/html.meta.json`), { encoding: 'utf-8' })
+    const metaJsonGzipeed = fs.readFileSync(resolve(root, `${basePath}/html.meta.json.gz`))
+    const metaJson = zlib.gunzipSync(metaJsonGzipeed).toString('utf-8')
     const indexHtml = fs.readFileSync(resolve(root, `${basePath}/index.html`), { encoding: 'utf-8' })
     const resultJson = parse(metaJson.replace(new RegExp(vitestRoot, 'g'), '<rootDir>'))
     resultJson.config = {} // doesn't matter for a test
@@ -38,7 +40,7 @@ describe.skipIf(skip)('html reporter', async () => {
     expect(task.result.error).not.toBeDefined()
     expect(task.result.logs).not.toBeDefined()
     expect(resultJson).toMatchSnapshot(`tests are ${expected}`)
-    expect(indexHtml).toMatch('window.METADATA_PATH="html.meta.json"')
+    expect(indexHtml).toMatch('window.METADATA_PATH="html.meta.json.gz"')
   }, 120000)
 
   it('resolves to "failing" status for test file "json-fail"', async () => {
@@ -52,7 +54,8 @@ describe.skipIf(skip)('html reporter', async () => {
       },
       stdio: 'inherit',
     }).catch(e => e)
-    const metaJson = fs.readFileSync(resolve(root, `${basePath}/html.meta.json`), { encoding: 'utf-8' })
+    const metaJsonGzipped = fs.readFileSync(resolve(root, `${basePath}/html.meta.json.gz`))
+    const metaJson = zlib.gunzipSync(metaJsonGzipped).toString('utf-8')
     const indexHtml = fs.readFileSync(resolve(root, `${basePath}/index.html`), { encoding: 'utf-8' })
     const resultJson = parse(metaJson.replace(new RegExp(vitestRoot, 'g'), '<rootDir>'))
     resultJson.config = {} // doesn't matter for a test
@@ -77,6 +80,6 @@ describe.skipIf(skip)('html reporter', async () => {
     task.logs[0].taskId = 0
     task.logs[0].time = 0
     expect(resultJson).toMatchSnapshot(`tests are ${expected}`)
-    expect(indexHtml).toMatch('window.METADATA_PATH="html.meta.json"')
+    expect(indexHtml).toMatch('window.METADATA_PATH="html.meta.json.gz"')
   }, 120000)
 })