1 files changed, 26 insertions, 0 deletions
diff --git a/packages/integrations/cloudflare/src/utils/deduplicatePatterns.ts b/packages/integrations/cloudflare/src/utils/deduplicatePatterns.ts
new file mode 100644
index 000000000..37743fe55
--- /dev/null
+++ b/packages/integrations/cloudflare/src/utils/deduplicatePatterns.ts
@@ -0,0 +1,26 @@
+/**
+ * Remove duplicates and redundant patterns from an `include` or `exclude` list.
+ * Otherwise Cloudflare will throw an error on deployment. Plus, it saves more entries.
+ * E.g. `['/foo/*', '/foo/*', '/foo/bar'] => ['/foo/*']`
+ * @param patterns a list of `include` or `exclude` patterns
+ * @returns a deduplicated list of patterns
+ */
+export function deduplicatePatterns(patterns: string[]) {
+	const openPatterns: RegExp[] = [];
+
+	// A value in the set may only occur once; it is unique in the set's collection.
+	// ref: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set
+	return [...new Set(patterns)]
+		.sort((a, b) => a.length - b.length)
+		.filter((pattern) => {
+			if (openPatterns.some((p) => p.test(pattern))) {
+				return false;
+			}
+
+			if (pattern.endsWith('*')) {
+				openPatterns.push(new RegExp(`^${pattern.replace(/(\*\/)*\*$/g, '.*')}`));
+			}
+
+			return true;
+		});
+}