From 58be1809c46cbe517a18d86d0af52179dcc5cbf6 Mon Sep 17 00:00:00 2001
From: Elizabeth Hunt <me@liz.coffee>
Date: Sun, 29 Jun 2025 17:31:30 -0700
Subject: Move to nodejs and also lots of significant refactoring that
 should've been broken up but idgaf

---
 u/fn/either.ts | 100 ---------------------------------------------------------
 1 file changed, 100 deletions(-)
 delete mode 100644 u/fn/either.ts

(limited to 'u/fn/either.ts')

diff --git a/u/fn/either.ts b/u/fn/either.ts
deleted file mode 100644
index 8c47b64..0000000
--- a/u/fn/either.ts
+++ /dev/null
@@ -1,100 +0,0 @@
-import { type Mapper, type Supplier, isObject } from '@emprespresso/pengueno';
-
-type IEitherTag = 'IEither';
-const iEitherTag: IEitherTag = 'IEither';
-
-export interface _Either<LeftT, RightT, T> {
-    readonly isLeft: LeftT;
-    readonly isRight: RightT;
-    readonly value: T;
-}
-export type Left<E> = _Either<true, false, E>;
-export type Right<T> = _Either<false, true, T>;
-
-export interface IEither<E, T> {
-    readonly _tag: IEitherTag;
-
-    mapBoth: <_E, _T>(errBranch: Mapper<E, _E>, okBranch: Mapper<T, _T>) => IEither<_E, _T>;
-    fold: <_T>(folder: Mapper<Left<E> | Right<T>, _T>) => _T;
-    moveRight: <_T>(t: _T) => IEither<E, _T>;
-    mapRight: <_T>(mapper: Mapper<T, _T>) => IEither<E, _T>;
-    mapLeft: <_E>(mapper: Mapper<E, _E>) => IEither<_E, T>;
-    flatMap: <_T>(mapper: Mapper<T, IEither<E, _T>>) => IEither<E, _T>;
-    flatMapAsync: <_T>(mapper: Mapper<T, Promise<IEither<E, _T>>>) => Promise<IEither<E, _T>>;
-}
-
-export class Either<E, T> implements IEither<E, T> {
-    private readonly self: Left<E> | Right<T>;
-
-    private constructor(
-        init: { err?: E; ok?: T },
-        public readonly _tag: IEitherTag = iEitherTag,
-    ) {
-        this.self = <Left<E> | Right<T>>{
-            isLeft: 'err' in init,
-            isRight: 'ok' in init,
-            value: init.err ?? init.ok!,
-        };
-    }
-
-    public moveRight<_T>(t: _T) {
-        return this.mapRight(() => t);
-    }
-
-    public fold<_T>(folder: Mapper<Left<E> | Right<T>, _T>): _T {
-        return folder(this.self);
-    }
-
-    public mapBoth<_E, _T>(errBranch: Mapper<E, _E>, okBranch: Mapper<T, _T>): IEither<_E, _T> {
-        if (this.self.isLeft) return Either.left(errBranch(this.self.value));
-        return Either.right(okBranch(this.self.value));
-    }
-
-    public flatMap<_T>(mapper: Mapper<T, IEither<E, _T>>): IEither<E, _T> {
-        if (this.self.isRight) return mapper(this.self.value);
-        return Either.left<E, _T>(this.self.value);
-    }
-
-    public mapRight<_T>(mapper: Mapper<T, _T>): IEither<E, _T> {
-        if (this.self.isRight) return Either.right<E, _T>(mapper(this.self.value));
-        return Either.left<E, _T>(this.self.value);
-    }
-
-    public mapLeft<_E>(mapper: Mapper<E, _E>): IEither<_E, T> {
-        if (this.self.isLeft) return Either.left<_E, T>(mapper(this.self.value));
-        return Either.right<_E, T>(this.self.value);
-    }
-
-    public async flatMapAsync<_T>(mapper: Mapper<T, Promise<IEither<E, _T>>>): Promise<IEither<E, _T>> {
-        if (this.self.isLeft) {
-            return Promise.resolve(Either.left<E, _T>(this.self.value));
-        }
-        return await mapper(this.self.value).catch((err) => Either.left<E, _T>(err));
-    }
-
-    static left<E, T>(e: E): IEither<E, T> {
-        return new Either<E, T>({ err: e });
-    }
-
-    static right<E, T>(t: T): IEither<E, T> {
-        return new Either<E, T>({ ok: t });
-    }
-
-    static fromFailable<E, T>(s: Supplier<T>): IEither<E, T> {
-        try {
-            return Either.right<E, T>(s());
-        } catch (e) {
-            return Either.left<E, T>(e as E);
-        }
-    }
-
-    static async fromFailableAsync<E, T>(s: Supplier<Promise<T>> | Promise<T>): Promise<IEither<E, T>> {
-        return await (typeof s === 'function' ? s() : s)
-            .then((t: T) => Either.right<E, T>(t))
-            .catch((e: E) => Either.left<E, T>(e));
-    }
-}
-
-export const isEither = <E, T>(o: unknown): o is IEither<E, T> => {
-    return isObject(o) && '_tag' in o && o._tag === 'IEither';
-};
-- 
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