Better error messaging for promise sources

11ty · Oct 23, 2024 · bf70fa0 · bf70fa0
1 parent ef9c3fb
commit bf70fa0
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/src/AssetCache.js b/src/AssetCache.js
@@ -15,6 +15,10 @@ class AssetCache {
 			(typeof url === "object" && typeof url.then === "function") ||
 			(typeof url === "function" && url.constructor.name === "AsyncFunction")
 		) {
+			if(typeof options.formatUrlForDisplay !== "function") {
+				throw new Error("When caching an arbitrary promise source, options.formatUrlForDisplay is required.");
+			}
+
 			uniqueKey = options.formatUrlForDisplay();
 		} else {
 			uniqueKey = url;