diff --git a/build.js b/build.js
index f27664f..7a14490 100644
--- a/build.js
+++ b/build.js
@@ -10,6 +10,7 @@ esbuild.buildSync({
   define: {
     global: "self",
   },
+  inject: ["./polyfill.js"],
 });
 
 esbuild.buildSync({
diff --git a/polyfill.js b/polyfill.js
new file mode 100644
index 0000000..c9d9300
--- /dev/null
+++ b/polyfill.js
@@ -0,0 +1,2 @@
+export const process = require("process");
+export const Buffer = require("buffer").Buffer;