diff --git a/src/engine/operations/helpers.ts b/src/engine/operations/helpers.ts
index 6529bc3..c4fdad1 100644
--- a/src/engine/operations/helpers.ts
+++ b/src/engine/operations/helpers.ts
@@ -68,6 +68,6 @@ export function convertQ(q: Quantity, unit: Unit): Quantity {
   return qty(fromBase(toBase(q), unit), unit);
 }
 
-function qty(value: Decimal, unit: Unit | null, repr?: string) {
+function qty(value: Decimal, unit: Unit | null, repr?: "decimal" | "plain" | "fraction") {
   return { kind: "quantity" as const, value, unit, repr: repr ?? "decimal" };
 }
diff --git a/src/ui/editor.ts b/src/ui/editor.ts
index 618e366..61111d0 100644
--- a/src/ui/editor.ts
+++ b/src/ui/editor.ts
@@ -257,8 +257,8 @@ export class SumEditor {
     });
 
     this.resultsEl.addEventListener("click", (e) => {
-      const el = (e.target as HTMLElement).closest(".result-line");
-      if (el?.dataset.value) {this.cb.onCopy(el.dataset.value);}
+      const el = (e.target as HTMLElement).closest(".result-line") as HTMLElement | null;
+      if (el?.dataset.value) {this.cb.onCopy(el.dataset.value as string);}
     });
   }