fix(index): return undefined on error instead of null

index.js

@@ -113,7 +113,7 @@ function safeParse (text, reviver) {
   try {
     return _parse(text, reviver, { safe: true })
   } catch (_e) {
-    return null
+    return undefined
   } finally {
     Error.stackTraceLimit = stackTraceLimit
   }

test/index.test.js

@@ -432,10 +432,10 @@ test('safeParse', t => {
     t.end()
   })
 
-  t.test('returns null on invalid object string', t => {
+  t.test('returns undefined on invalid object string', t => {
     t.strictEqual(
       j.safeParse('{"a": 5, "b": 6'),
-      null
+      undefined
     )
     t.end()
   })

types/index.d.ts

@@ -37,7 +37,7 @@ declare namespace parse {
    *
    * @param text The JSON text string.
    * @param reviver The `JSON.parse()` optional `reviver` argument.
-   * @returns The parsed object, or `null` if there was an error or if the JSON contained possibly insecure properties.
+   * @returns The parsed object, or `undefined` if there was an error or if the JSON contained possibly insecure properties.
    */
   export function safeParse (text: string | Buffer, reviver?: Reviver | null): any