Shift try/catch to decode (#179)

src/index.ts

@@ -82,7 +82,7 @@ export interface ParseOptions {
  *
  * @default decodeURIComponent
  */
- decode?: (str: string) => string;
+ decode?: (str: string) => string | undefined;
 }
 
 /**
@@ -133,8 +133,8 @@ export function parse(
  valEndIdx--;
  }
 
- const val = str.slice(valStartIdx, valEndIdx);
- obj[key] = tryDecode(val, dec);
+ const value = dec(str.slice(valStartIdx, valEndIdx));
+ if (value !== undefined) obj[key] = value;
  }
 
  index = endIdx + 1;
@@ -366,8 +366,14 @@ export function serialize(
 /**
  * URL-decode string value. Optimized to skip native call when no %.
  */
-function decode(str: string): string {
- return str.indexOf("%") !== -1 ? decodeURIComponent(str) : str;
+function decode(str: string): string | undefined {
+ if (str.indexOf("%") === -1) return str;
+
+ try {
+ return decodeURIComponent(str);
+ } catch (e) {
+ return str;
+ }
 }
 
 /**
@@ -376,14 +382,3 @@ function decode(str: string): string {
 function isDate(val: any): val is Date {
  return __toString.call(val) === "[object Date]";
 }
-
-/**
- * Try decoding a string using a decoding function.
- */
-function tryDecode(str: string, decode: (str: string) => string): string {
- try {
- return decode(str);
- } catch (e) {
- return str;
- }
-}