@consolidados/results

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Result types, ease and simple

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type { Ok } from \"./ok\";\nimport type { ResultDefinition } from \"./result\";\n\n/**\n * Represents a failed result (`Err`) that contains an error value.\n * @template E The type of the error contained in this `Err`. Can be any type (Error, string, enum, etc).\n */\nexport class Err<E> implements ResultDefinition<never, E> {\n private error: E;\n /**\n * Creates a new `Err` instance with the given error value.\n * @param error The error to wrap in the `Err` instance. Can be any type.\n */\n constructor(error: E) {\n // Store error as-is - conversion is handled by factory function\n this.error = error;\n // Object.setPrototypeOf(this, Err.prototype);\n //\n // if (Error.captureStackTrace) {\n // Error.captureStackTrace(this, Err);\n // }\n }\n\n /**\n * Checks if this result is an `Ok`.\n * @returns `false` because this is an `Err`.\n */\n isOk(): this is Ok<never> {\n return false;\n }\n\n /**\n * Checks if this result is an `Err`.\n * @returns `true` because this is an `Err`.\n */\n isErr(): this is Err<E> {\n return true;\n }\n\n /**\n * Retrieves the value contained in this result. Since this is an `Err`, an error is thrown.\n * @throws An error because `unwrap` is called on an `Err`.\n */\n unwrap(): never {\n throw new Error(\"Called unwrap on an Err value\");\n }\n\n /**\n * Maps the value (if any). Since this is an `Err`, the mapping function is ignored, and the original `Err` is returned.\n * @template U The type of the value (ignored for `Err`).\n * @param _fn The mapping function for values (not used).\n * @returns The original `Err` instance.\n */\n map(_fn: (value: never) => U): ResultDefinition<never, E> {\n return this as unknown as ResultDefinition<never, E>;\n }\n\n /**\n * Maps the error value using a transformation function and returns a new `Result` with the transformed error.\n * @template U The type of the transformed error. Can be any type.\n * @param fn The transformation function to apply to the error value.\n * @returns A new `Err` containing the transformed error.\n */\n mapErr(fn: (err: E) => U): ResultDefinition<never, U> {\n return new Err(fn(this.error)) as unknown as ResultDefinition<never, U>;\n }\n\n /**\n * Applies a transformation function that returns a `Result` to the value (which does not exist) of this `Err`.\n * @template U The type of the value in the resulting `Result`.\n * @template F The type of the error in the resulting `Result`.\n * @param _fn The transformation function (ignored in this implementation).\n * @returns The original `Err` instance cast to the new error type.\n */\n flatMap<U, F = E>(\n _fn: (value: never) => ResultDefinition<U, F>,\n ): ResultDefinition<U, E> {\n return this as unknown as ResultDefinition<U, E>;\n }\n\n /**\n * Retrieves the error value contained in this `Err`.\n * @returns The error value contained in this `Err`.\n */\n unwrapErr(): E {\n return this.error;\n }\n\n /**\n * Returns the inner error. After an `isErr()` type guard, TypeScript narrows the return type to `E`.\n * Without a type guard, returns `T | E` (use `isOk()` or `isErr()` for type narrowing).\n * @returns The error value contained in this `Err`.\n */\n value(): E {\n return this.error;\n }\n\n /**\n * Returns the contained value if `Ok`, otherwise returns the provided default value.\n * @template U The type of the default value.\n * @param defaultValue The value to return since this is an `Err`.\n * @returns The provided default value.\n */\n unwrapOr(defaultValue: U): U {\n return defaultValue;\n }\n\n /**\n * Returns the contained value if `Ok`, otherwise computes and returns the result of the provided function.\n * @template U The type of the default value.\n * @param fn The function to compute the default value.\n * @returns The result of calling the provided function with the error.\n */\n unwrapOrElse(fn: (error: E) => U): U {\n return fn(this.error);\n }\n\n /**\n * Returns this `Err` if it is `Err`, otherwise returns the result of the provided function.\n * @template T The type of the alternative success value.\n * @template F The type of the alternative error.\n * @param fn The function to compute the alternative result.\n * @returns The result of calling the provided function with the error.\n */\n orElse<T, F>(\n fn: (error: E) => ResultDefinition<T, F>,\n ): ResultDefinition<T, F> {\n return fn(this.error);\n }\n\n /**\n * Converts `Result` type to `Option` type.\n * @returns `Some` if the result is `Ok`, `None` if the result is `Err`.\n */\n ok() {\n return None();\n }\n}\n","import type { ResultDefinition } from \"./result\";\nimport type { Err } from \"./err\";\n\n/**\n * Represents a successful result (`Ok`) that contains a value.\n * @template T The type of the value contained in this `Ok`.\n */\nexport class Ok<T> implements ResultDefinition<T, never> {\n /**\n * Creates a new `Ok` instance with the given value.\n * @param _value The value to wrap in the `Ok` instance.\n */\n constructor(private _value: T) {}\n /**\n * Checks if this result is an `Ok`.\n * @returns `true` because this is an `Ok`.\n */\n isOk(): this is Ok<T> {\n return true;\n }\n\n /**\n * Checks if this result is an `Err`.\n * @returns `false` because this is an `Ok`.\n */\n isErr(): this is Err<never> {\n return false;\n }\n\n /**\n * Retrieves the value contained in this `Ok`.\n * @returns The value contained in this `Ok`.\n */\n unwrap(): T {\n return this._value;\n }\n\n /**\n * Returns the inner value. 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Since this is an `Ok`, the error mapping function is ignored, and the original `Ok` is returned.\n * @template U The type of the error (ignored for `Ok`). Can be any type.\n * @param _fn The mapping function for errors (not used).\n * @returns The original `Ok` instance.\n */\n mapErr(_fn: (err: never) => U): ResultDefinition<T, U> {\n return this as unknown as ResultDefinition<T, U>;\n }\n\n /**\n * Retrieves the error contained in this result. Since this is an `Ok`, an error is thrown.\n * @throws An error because `unwrapErr` is called on an `Ok`.\n */\n unwrapErr(): never {\n throw new Error(\"Called unwrapErr on an Ok value\");\n }\n\n /**\n * Returns the contained value if `Ok`, otherwise returns the provided default value.\n * @template U The type of the default value.\n * @param defaultValue The value to return if this is an `Err`.\n * @returns The value contained in this `Ok`.\n */\n unwrapOr(defaultValue: U): T {\n return this._value;\n }\n\n /**\n * Returns the contained value if `Ok`, otherwise computes and returns the result of the provided function.\n * @template U The type of the default value.\n * @param fn The function to compute the default value.\n * @returns The value contained in this `Ok`.\n */\n unwrapOrElse(fn: (error: never) => U): T {\n return this._value;\n }\n\n /**\n * Returns this `Ok` if it is `Ok`, otherwise returns the result of the provided function.\n * @template F The type of the alternative error.\n * @param fn The function to compute the alternative result.\n * @returns The original `Ok` instance.\n */\n orElse<F>(fn: (error: never) => ResultDefinition<T, F>): ResultDefinition<T, F> {\n return this as unknown as ResultDefinition<T, F>;\n }\n\n /**\n * Converts `Result` type to `Option` type.\n * @returns `Some` if the result is `Ok`, `None` if the result is `Err`.\n */\n ok() {\n return Some(this._value);\n }\n}\n","import {\n Err as ErrType,\n Ok as OkType,\n type Result,\n} from \"./__internal__/return-types\";\n\n/**\n * Creates a new `Ok` instance, representing a successful result.\n * @template T The type of the value contained in the `Ok`.\n * @param value The value to wrap in the `Ok` instance.\n * @returns An `Ok` instance containing the given value.\n * @example\n * const result = Ok(42);\n * console.log(result.isOk()); // true\n * console.log(result.unwrap()); // 42\n */\nfunction Ok<T>(value: T): OkType<T> {\n return new OkType(value);\n}\n\n/**\n * Creates an Err - strings are converted to Error, everything else preserved\n */\nfunction Err<E>(error: E): ErrType<E> {\n return new ErrType(error);\n}\n\n// biome-ignore lint/suspicious/noExplicitAny: <explanation>\n(globalThis as any).Ok = Ok;\n// biome-ignore lint/suspicious/noExplicitAny: <explanation>\n(globalThis as any).Err = Err;\n\nexport { Err, Ok, Result, ErrType, OkType };\n","import type { None as NoneType } from \"./none\";\nimport type { Option } from \"./option\";\nimport { None } from \"../../option\";\nimport { Ok } from \"@/result\";\n\n/**\n * Represents a `Some` option, which holds a value.\n * @template T The type of the value held by this `Some` instance.\n */\nexport class Some<T> {\n /**\n * Creates a new `Some` option with the given value.\n * @param _value The value to be wrapped in the `Some` option.\n */\n constructor(private _value: T) { }\n\n /**\n * Checks if this option is a `Some`.\n * @returns `true` if this option is a `Some`, otherwise `false`.\n */\n isSome(): this is Some<T> {\n return true;\n }\n\n /**\n * Checks if this option is a `None`.\n * @returns `false` because this is a `Some`.\n */\n isNone(): this is NoneType {\n return false;\n }\n\n /**\n * Unwraps the value held by this `Some` option.\n * @returns The value held by this `Some` option.\n */\n unwrap(): T {\n return this._value;\n }\n\n /**\n * Returns the inner value. After an `isSome()` type guard, TypeScript narrows the return type to `T`.\n * Without a type guard, returns `T | undefined` (use `isSome()` or `isNone()` for type narrowing).\n * @returns The value held by this `Some` option.\n */\n value(): T {\n return this._value;\n }\n\n /**\n * Applies a transformation function to the value held by this `Some` option and returns a new `Option` with the transformed value.\n * @template U The type of the transformed value.\n * @param fn The transformation function to apply to the value.\n * @returns A new `Some` option containing the transformed value.\n */\n map(fn: (value: T) => U): Option {\n return new Some(fn(this._value));\n }\n\n /**\n * Applies a transformation function that returns an `Option` to the value held by this `Some` option.\n * @template U The type of the value in the resulting `Option`.\n * @param fn The transformation function to apply to the value.\n * @returns The result of applying the transformation function.\n */\n flatMap(fn: (value: T) => Option): Option {\n return fn(this._value);\n }\n\n /**\n * Returns the value held by this `Some` option, ignoring the default value provided.\n * @param _ A default value (ignored in this implementation).\n * @returns The value held by this `Some` option.\n */\n unwrapOr(_: T): T {\n return this._value;\n }\n\n /**\n * Returns the value held by this `Some` option, ignoring the function provided.\n * @template U The type of the default value.\n * @param _fn A function to compute the default value (ignored in this implementation).\n * @returns The value held by this `Some` option.\n */\n unwrapOrElse(_fn: () => U): T {\n return this._value;\n }\n\n /**\n * Converts this `Option` to a `Result`, using the provided error value if this is `None`.\n * @template E The type of the error.\n * @param _error The error value to use if this is `None` (ignored since this is `Some`).\n * @returns An `Ok` result containing the value from this `Some`.\n */\n okOr<E>(_error: E) {\n return Ok(this._value);\n }\n\n /**\n * Filters this `Option` based on a predicate function.\n * @param predicate The function to test the value.\n * @returns This `Some` if the predicate returns true, otherwise `None`.\n */\n filter(predicate: (value: T) => boolean): Option<T> {\n return predicate(this._value) ? this : None();\n }\n}\n","import type { Some } from \"./some\";\nimport type { Option } from \"./option\";\nimport { None as NoneFactory } from \"../../option\";\nimport { Err } from \"@/result\";\n\n/**\n * Represents a `None` option, which holds no value.\n */\nexport class None {\n /**\n * Checks if this option is a `Some`.\n * @returns `false` because this is a `None`.\n */\n isSome(): this is Some<never> {\n return false;\n }\n\n /**\n * Checks if this option is a `None`.\n * @returns `true` because this is a `None`.\n */\n isNone(): this is None {\n return true;\n }\n\n /**\n * Attempts to unwrap the value from this `None` option.\n * @throws An error because `None` has no value.\n */\n unwrap(): never {\n throw new Error(\"Called unwrap on a None value\");\n }\n\n /**\n * Returns `undefined` for a `None` option. 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