1 files changed, 13 insertions, 11 deletions
diff --git a/multipart/multipart.ts b/multipart/multipart.ts
index 9b3f1ceb0..0032e1cf5 100644
--- a/multipart/multipart.ts
+++ b/multipart/multipart.ts
@@ -166,19 +166,21 @@ class PartReader implements Reader, Closer {
     this.contentDisposition = comps[0];
     comps
       .slice(1)
-      .map(v => v.trim())
-      .map(kv => {
-        const [k, v] = kv.split("=");
-        if (v) {
-          const s = v.charAt(0);
-          const e = v.charAt(v.length - 1);
-          if ((s === e && s === '"') || s === "'") {
-            params[k] = v.substr(1, v.length - 2);
-          } else {
-            params[k] = v;
+      .map((v): string => v.trim())
+      .map(
+        (kv): void => {
+          const [k, v] = kv.split("=");
+          if (v) {
+            const s = v.charAt(0);
+            const e = v.charAt(v.length - 1);
+            if ((s === e && s === '"') || s === "'") {
+              params[k] = v.substr(1, v.length - 2);
+            } else {
+              params[k] = v;
+            }
           }
         }
-      });
+      );
     return (this.contentDispositionParams = params);
   }