From 19e05697a64acf367b26f8c634a24bd3e82475ff Mon Sep 17 00:00:00 2001
From: Shigma <33423008+Shigma@users.noreply.github.com>
Date: Sun, 31 Mar 2019 01:36:12 +0800
Subject: [PATCH] feat($core): functional siteConfig.evergreen (#1489)

---
 packages/@vuepress/core/lib/node/webpack/createBaseConfig.js | 5 ++++-
 packages/docs/docs/config/README.md                          | 2 +-
 packages/docs/docs/zh/config/README.md                       | 2 +-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/packages/@vuepress/core/lib/node/webpack/createBaseConfig.js b/packages/@vuepress/core/lib/node/webpack/createBaseConfig.js
index 1bbd5caff5..f90ba6ffea 100644
--- a/packages/@vuepress/core/lib/node/webpack/createBaseConfig.js
+++ b/packages/@vuepress/core/lib/node/webpack/createBaseConfig.js
@@ -127,7 +127,10 @@ module.exports = function createBaseConfig (context, isServer) {
       .loader('pug-plain-loader')
       .end()
 
-  if (!siteConfig.evergreen) {
+  const evergreen = typeof siteConfig.evergreen === 'function'
+    ? siteConfig.evergreen()
+    : siteConfig.evergreen
+  if (!evergreen) {
     const libDir = path.join(__dirname, '..')
     config.module
       .rule('js')
diff --git a/packages/docs/docs/config/README.md b/packages/docs/docs/config/README.md
index 0dfe76dc76..88600862e5 100644
--- a/packages/docs/docs/config/README.md
+++ b/packages/docs/docs/config/README.md
@@ -356,7 +356,7 @@ module.exports = {
 
 ### evergreen
 
-- Type: `boolean`
+- Type: `boolean | Function`
 - Default: `false`
 
 Set to `true` if you are only targeting evergreen browsers. This will disable ES5 transpilation and polyfills for IE, and result in faster builds and smaller files.
diff --git a/packages/docs/docs/zh/config/README.md b/packages/docs/docs/zh/config/README.md
index 21956e7ada..20f863a3f2 100644
--- a/packages/docs/docs/zh/config/README.md
+++ b/packages/docs/docs/zh/config/README.md
@@ -348,7 +348,7 @@ module.exports = {
 
 ### evergreen
 
-- 类型: `boolean`
+- 类型: `boolean | Function`
 - 默认值: `false`
 
 如果你的对象只有那些 “常青树” 浏览器，你可以将其设置成 `true`，这将会禁止 ESNext 到 ES5 的转译以及对 IE 的 polyfills，同时会带来更快的构建速度和更小的文件体积。