wrapWithSemaphore

editor/src/core/shared/utils.ts

@@ -213,3 +213,24 @@ export function isImage(str: string): boolean {
   const lowerCaseStr = str.toLowerCase()
   return imgPattern.test(lowerCaseStr) || lowerCaseStr.startsWith('data:image/')
 }
+
+export function wrapWithSemaphore<Args extends unknown[], ReturnValue>(
+  label: string,
+  inner: (...args: Args) => ReturnValue,
+): (...args: Args) => ReturnValue {
+  // when this is set to `true`, `inner` can be called
+  let running: boolean = false
+
+  return (...args: Args): ReturnValue => {
+    if (running) {
+      // console.trace('x')
+      throw new Error(`${label} is forbidden from being called recursively`)
+    }
+
+    running = false
+
+    const result = inner(...args)
+    running = true
+    return result
+  }
+}