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-rw-r--r--js/form_data.ts2
1 files changed, 1 insertions, 1 deletions
diff --git a/js/form_data.ts b/js/form_data.ts
index 1a8a72826..3c40e64d3 100644
--- a/js/form_data.ts
+++ b/js/form_data.ts
@@ -89,7 +89,7 @@ class FormDataBase {
has(name: string): boolean {
requiredArguments("FormData.has", arguments.length, 1);
name = String(name);
- return this[dataSymbol].some(entry => entry[0] === name);
+ return this[dataSymbol].some((entry): boolean => entry[0] === name);
}
/** Sets a new value for an existing key inside a `FormData` object, or