stop using as

Author: bouzuya

src/rules/converters/space-before-function-paren.ts

@@ -14,9 +14,9 @@ export const convertSpaceBeforeFunctionParen: RuleConverter = tslintRule => {
             .map(option => `Option "${option}" is not supported by ESLint.`);
         const filtered = Object.keys(argument)
             .filter(option => SUPPORTED_OPTIONS.includes(option))
-            .reduce((obj, option) => {
+            .reduce<Record<string, "always" | "never">>((obj, option) => {
                 return { ...obj, [option]: argument[option] };
-            }, {} as { [key: string]: "always" | "never" });
+            }, {});
         return {
             rules: [
                 {