use null instead of undefined

README.md

@@ -253,8 +253,8 @@ The `Result` class represents the form of the value returned by the `try` operat
    A `Result` instance contains three properties:
 
    - **`ok`**: A boolean indicating whether the expression executed successfully.
-   - **`error`**: The error thrown during execution, or `null` if no error occurred.
-   - **`value`**: The data returned from the execution, or `null` if an error occurred.
+   - **`error`**: The error thrown during execution, or `undefined` if no error occurred.
+   - **`value`**: The data returned from the execution, or `undefined` if an error occurred.
 
    Example usage:
 
@@ -280,7 +280,7 @@ The `Result` class represents the form of the value returned by the `try` operat
 
    ```js
    // Creating a successful result
-   const result = new Result(true, null, value)
+   const result = new Result(true, undefined, value)
    const result = Result.ok(value)
 
    // Creating an error result

polyfill.d.ts

@@ -8,14 +8,14 @@
 /**
  * Error result type expressed as object
  */
-type ErrorObjectResult = { ok: false; error: unknown; value: null }
+type ErrorObjectResult = { ok: false; error: unknown; value: undefined }
 
 /**
  * Error result type expressed as tuple.
  *
  * - `error` type depends on `useUnknownInCatchVariables` tsconfig option
  */
-type ErrorTupleResult = [ok: false, error: unknown, value: null]
+type ErrorTupleResult = [ok: false, error: unknown, value: undefined]
 
 /**
  * An error result is a object that can be either destructured {@link ErrorObjectResult} or accessed by index {@link ErrorTupleResult}
@@ -25,12 +25,12 @@ type ErrorResult = ErrorObjectResult & ErrorTupleResult
 /**
  * Value result type expressed as object
  */
-type ValueObjectResult<V> = { ok: true; error: null; value: V }
+type ValueObjectResult<V> = { ok: true; error: undefined; value: V }
 
 /**
  * Value result type expressed as tuple
  */
-type ValueTupleResult<V> = [ok: true, error: null, value: V]
+type ValueTupleResult<V> = [ok: true, error: undefined, value: V]
 
 /**
  * A value result is a object that can be either destructured {@link ValueObjectResult} or accessed by index {@link ValueTupleResult}
@@ -48,7 +48,7 @@ interface ResultConstructor {
    *
    * @example
    *
-   * new Result(true, null, 42)
+   * new Result(true, undefined, 42)
    * new Result(false, new Error('Something went wrong'))
    */
   new <V>(...args: ValueTupleResult<V> | ErrorTupleResult): Result<V>

polyfill.js

@@ -2,10 +2,6 @@
 
 /** @type {ResultConstructor} */
 class Result {
-  ok = false
-  error = null
-  value = null
-
   constructor(ok, error, value) {
     this.ok = ok
     this.error = error
@@ -19,10 +15,10 @@ class Result {
   }
 
   static ok(value) {
-    return new Result(true, null, value)
+    return new Result(true, undefined, value)
   }
 
   static error(error) {
-    return new Result(false, error, null)
+    return new Result(false, error, undefined)
   }
 }