diff --git a/packages/git-mob/src/colours.js b/packages/git-mob/src/colours.js
deleted file mode 100644
index 4d13ace..0000000
--- a/packages/git-mob/src/colours.js
+++ /dev/null
@@ -1,13 +0,0 @@
-const RED = '\u001B[31m';
-const YELLOW = '\u001B[33m';
-const RESET = '\u001B[0m';
-
-function red(text) {
-  return RED + text + RESET;
-}
-
-function yellow(text) {
-  return YELLOW + text + RESET;
-}
-
-export { red, yellow };
diff --git a/packages/git-mob/src/colours.ts b/packages/git-mob/src/colours.ts
new file mode 100644
index 0000000..41d4a76
--- /dev/null
+++ b/packages/git-mob/src/colours.ts
@@ -0,0 +1,15 @@
+const colours = {
+  red: '\u001B[31m',
+  yellow: '\u001B[33m',
+};
+const reset = '\u001B[0m';
+
+function red(text: string) {
+  return colours.red + text + reset;
+}
+
+function yellow(text: string) {
+  return colours.yellow + text + reset;
+}
+
+export { red, yellow };