refactor: don't use NonNullable<unknown>

packages/result/src/Result.ts

@@ -577,7 +577,7 @@ export interface Result<T, E> {
      *
      * ref: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
      */
-    transpose(): Optional<Result<T & NonNullable<unknown>, E>>;
+    transpose(): Optional<Result<T & {}, E>>;
 
     /**
      * Returns `true` if `self` equals to `other`.

packages/result/src/ResultAsync.ts

@@ -583,7 +583,7 @@ export interface ResultAsync<T, E> extends PromiseLike<Result<T, E>> {
      *
      * ref: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
      */
-    transpose(): Promise<Optional<Result<T & NonNullable<unknown>, E>>>;
+    transpose(): Promise<Optional<Result<T & {}, E>>>;
 
     /**
      * Asynchronously returns `true` if `self` equals to `other`.

packages/result/src/RustlikeResult.ts

@@ -151,7 +151,7 @@ export class RustlikeResult<T, E> implements Result<T, E> {
         return this.isOk() ? RustlikeResult.Ok(this._value!) : op(this._error!);
     }
 
-    transpose(): Optional<Result<T & NonNullable<unknown>, E>> {
+    transpose(): Optional<Result<T & {}, E>> {
         if (this.isOk()) {
             return this._value === undefined || this._value === null ? undefined : RustlikeResult.Ok(this._value);
         }

packages/result/src/RustlikeResultAsync.ts

@@ -150,7 +150,7 @@ export class RustlikeResultAsync<T, E> implements ResultAsync<T, E> {
         );
     }
 
-    transpose(): Promise<Optional<Result<T & NonNullable<unknown>, E>>> {
+    transpose(): Promise<Optional<Result<T & {}, E>>> {
         return this._promise.then((result) => result.transpose());
     }