workflow: only generate changelog for the latest release and concat with the old

so that the old manually edited parts won't be overwritten.

scripts/genChangelog.js

@@ -1,26 +1,42 @@
+const fs = require('fs')
+const path = require('path')
 const execa = require('execa')
 const cc = require('conventional-changelog')
 const config = require('@vue/conventional-changelog')
 
-const gen = module.exports = version => {
-  const fileStream = require('fs').createWriteStream(`CHANGELOG.md`)
-
-  cc({
-    config,
-    releaseCount: 0,
-    pkg: {
-      transform (pkg) {
-        pkg.version = `v${version}`
-        return pkg
+function genNewRelease (version) {
+  return new Promise(resolve => {
+    const newReleaseStream = cc({
+      config,
+      releaseCount: 1,
+      pkg: {
+        transform (pkg) {
+          pkg.version = `v${version}`
+          return pkg
+        }
       }
-    }
-  }).pipe(fileStream).on('close', async () => {
-    delete process.env.PREFIX
-    await execa('git', ['add', '-A'], { stdio: 'inherit' })
-    await execa('git', ['commit', '-m', `chore: ${version} changelog [ci skip]`], { stdio: 'inherit' })
+    })
+
+    let output = ''
+    newReleaseStream.on('data', buf => {
+      output += buf
+    })
+    newReleaseStream.on('end', () => resolve(output))
   })
 }
 
+const gen = (module.exports = async version => {
+  const newRelease = await genNewRelease(version)
+  const changelogPath = path.resolve(__dirname, '../CHANGELOG.md')
+
+  const newChangelog = newRelease + fs.readFileSync(changelogPath, { encoding: 'utf8' })
+  fs.writeFileSync(changelogPath, newChangelog)
+
+  delete process.env.PREFIX
+  await execa('git', ['add', '-A'], { stdio: 'inherit' })
+  await execa('git', ['commit', '-m', `chore: ${version} changelog [ci skip]`], { stdio: 'inherit' })
+})
+
 if (process.argv[2] === 'run') {
   const version = require('../lerna.json').version
   gen(version)

scripts/release.js

@@ -103,7 +103,7 @@ const release = async () => {
   }
   await execa(require.resolve('lerna/cli'), lernaArgs, { stdio: 'inherit' })
 
-  require('./genChangelog')(version)
+  await require('./genChangelog')(version)
 
   const packages = JSON.parse(
     (await execa(require.resolve('lerna/cli'), ['list', '--json'])).stdout