Load local PostCSS package if available

tailwindlabs · May 4, 2022 · 3d53043 · 3d53043
1 parent bb0ab67
commit 3d53043
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Showing 2 changed files with 16 additions and 3 deletions.
diff --git a/src/cli-peer-dependencies.js b/src/cli-peer-dependencies.js
@@ -1,4 +1,6 @@
-export let postcss = require('postcss')
+export function lazyPostcss() {
+  return require('postcss')
+}
 
 export function lazyAutoprefixer() {
   return require('autoprefixer')

diff --git a/src/cli.js b/src/cli.js
@@ -1,6 +1,6 @@
 #!/usr/bin/env node
 
-import { postcss, lazyCssnano, lazyAutoprefixer } from '../peers/index.js'
+import { lazyPostcss, lazyCssnano, lazyAutoprefixer } from '../peers/index.js'
 
 import chokidar from 'chokidar'
 import path from 'path'
@@ -576,7 +576,18 @@ async function build() {
         })(),
     ].filter(Boolean)
 
-    let processor = postcss(plugins)
+    function loadPostcss() {
+      // Try to load a local `postcss` version first
+      try {
+        if (!process.env.BUILT_IN_POSTCSS) {
+          return require('postcss')
+        }
+      } catch {}
+
+      return lazyPostcss()
+    }
+
+    let processor = loadPostcss()(plugins)
 
     function processCSS(css) {
       let start = process.hrtime.bigint()