Keep CDN URL for Vercel build

Author: cometkim

next.config.mjs

@@ -21,6 +21,7 @@ const config = {
     ENV: process.env.NODE_ENV,
     VERSION_LATEST: process.env.VERSION_LATEST,
     VERSION_NEXT: process.env.VERSION_NEXT,
+    VERCEL: process.env.VERCEL,
   },
   swcMinify: false,
   webpack: (config, options) => {

src/common/CompilerManagerHook.res

@@ -35,14 +35,18 @@ module LoadScript = {
 }
 
 module CdnMeta = {
-  let getCompilerUrl = (version): string =>
-    `/playground-bundles/${Semver.toString(version)}/compiler.js`
+  let baseUrl = switch Node.Process.env->Dict.get("VERCEL") {
+  | Some(_) => "https://cdn.rescript-lang.org"
+  | None => "/playground-bundles"
+  }
+
+  let getCompilerUrl = (version): string => `${baseUrl}/${Semver.toString(version)}/compiler.js`
 
   let getLibraryCmijUrl = (version, libraryName: string): string =>
-    `/playground-bundles/${Semver.toString(version)}/${libraryName}/cmij.js`
+    `${baseUrl}/${Semver.toString(version)}/${libraryName}/cmij.js`
 
   let getStdlibRuntimeUrl = (version, filename) =>
-    `/playground-bundles/${Semver.toString(version)}/compiler-builtins/stdlib/${filename}`
+    `${baseUrl}/${Semver.toString(version)}/compiler-builtins/stdlib/${filename}`
 }
 
 module FinalResult = {