diff --git a/src/util.mjs b/src/util.mjs
index 12bd843..60ac2b5 100644
--- a/src/util.mjs
+++ b/src/util.mjs
@@ -2,6 +2,15 @@
 
 import {execSync} from 'node:child_process';
 
+/**
+ * Converts a string from UTF-8 to base64.
+ * @param {string} str
+ * @returns {string}
+ */
+function toBase64 (str) {
+	return Buffer.from(str, 'utf-8').toString('base64');
+}
+
 /**
  * terrible terrible terrible string diff helper for debugging
  * @param {string} a
@@ -12,9 +21,11 @@ export function diff (a, b) {
 	// https://stackoverflow.com/a/60221847
 	// also use `|| true` to not throw an error when `diff` returns non-zero
 	execSync(`bash -c '
-		diff --color -u <(echo ${btoa(a)} | base64 -d) <(echo ${btoa(b)} | base64 -d)
+		diff --color -u <(echo ${toBase64(a)} | base64 -d) <(echo ${toBase64(b)} | base64 -d)
 	' || true`, {
 		// display result directly in terminal
 		stdio: 'inherit',
 	});
 }
+
+'yeet'