Improve accuracy of the isAsync type guard

deno/lib/README.md

@@ -361,6 +361,7 @@ There are a growing number of tools that are built atop or support Zod natively!
 - [`zodix`](https://github.com/rileytomasek/zodix): Zod utilities for FormData and URLSearchParams in Remix loaders and actions.
 - [`formik-validator-zod`](https://github.com/glazy/formik-validator-zod): Formik-compliant validator library that simplifies using Zod with Formik.
 - [`zod-i18n-map`](https://github.com/aiji42/zod-i18n): Useful for translating Zod error messages.
+- [`@modular-forms/solid`](https://github.com/fabian-hiller/modular-forms): Modular form library for SolidJS that supports Zod for validation.
 
 #### Zod to X
 

deno/lib/helpers/parseUtil.ts

@@ -175,4 +175,4 @@ export const isValid = <T>(x: ParseReturnType<T>): x is OK<T> | DIRTY<T> =>
 export const isAsync = <T>(
   x: ParseReturnType<T>
 ): x is AsyncParseReturnType<T> =>
-  typeof Promise !== undefined && x instanceof Promise;
+  typeof Promise !== "undefined" && x instanceof Promise;

src/helpers/parseUtil.ts

@@ -175,4 +175,4 @@ export const isValid = <T>(x: ParseReturnType<T>): x is OK<T> | DIRTY<T> =>
 export const isAsync = <T>(
   x: ParseReturnType<T>
 ): x is AsyncParseReturnType<T> =>
-  typeof Promise !== undefined && x instanceof Promise;
+  typeof Promise !== "undefined" && x instanceof Promise;