fix(prettier-plugin-liquid): route standalone externals to prettier/standalone

.changeset/fix-standalone-prettier-import.md

@@ -0,0 +1,5 @@
+---
+'@shopify/prettier-plugin-liquid': patch
+---
+
+Fix standalone build importing `prettier` instead of `prettier/standalone`, which caused browser bundlers (webpack, rollup, vite) consuming `standalone.js` to try to resolve Node builtins (`module`, `url`, `path`) from prettier's main entry

packages/prettier-plugin-liquid/webpack.config.js

@@ -15,9 +15,18 @@ module.exports = {
     },
   },
   externals: {
+    // The standalone bundle is browser-only. Downstream bundlers that consume
+    // standalone.js (webpack, rollup, vite) see a UMD wrapper whose `commonjs`
+    // and `commonjs2` branches `require('prettier')`. That import resolves to
+    // prettier's Node-flavored main entry, which pulls in `module`, `url`, and
+    // `path` and breaks browser builds. Route those branches to
+    // `prettier/standalone` so downstream bundlers land on prettier's
+    // browser-safe entry. `root: 'prettier'` is kept so <script>-tag loading
+    // still works against the global `window.prettier` populated by
+    // `prettier/standalone.js` on the page.
     prettier: {
-      commonjs: 'prettier',
-      commonjs2: 'prettier',
+      commonjs: 'prettier/standalone',
+      commonjs2: 'prettier/standalone',
       amd: 'prettier/standalone',
       root: 'prettier',
     },