fix(once): use boolean flag to check called or not

src/env.ts

@@ -10,7 +10,7 @@ const gitlabTokenGetter = once(() => {
   if (!process.env.GITLAB_TOKEN) {
     setFailed('Please add the `GITLAB_TOKEN` to the changesets action')
   }
-  return process.env.GITLAB_TOKEN ?? ''
+  return process.env.GITLAB_TOKEN as string
 })
 
 export const env = {

src/once.ts

@@ -1,9 +1,21 @@
+type OnceResult<T> =
+  | {
+      called: false
+    }
+  | {
+      data: T
+      called: true
+    }
+
 export const once = <T>(fn: () => T) => {
-  let result: T | undefined
+  let result: OnceResult<T> = { called: false }
   return () => {
-    if (result === undefined) {
-      result = fn()
+    if (!result.called) {
+      result = {
+        data: fn(),
+        called: true,
+      }
     }
-    return result
+    return result.data
   }
 }