ReaderEither: add apFirstW and apSecondW

gcanti · Oct 26, 2021 · ffc0b4d · ffc0b4d
1 parent 12f4e38
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diff --git a/docs/modules/ReaderEither.ts.md b/docs/modules/ReaderEither.ts.md
@@ -32,7 +32,9 @@ Added in v2.0.0
   - [of](#of)
 - [combinators](#combinators)
   - [apFirst](#apfirst)
+  - [apFirstW](#apfirstw)
   - [apSecond](#apsecond)
+  - [apSecondW](#apsecondw)
   - [asksReaderEither](#asksreadereither)
   - [asksReaderEitherW](#asksreadereitherw)
   - [chainEitherK](#chaineitherk)
@@ -300,6 +302,20 @@ export declare const apFirst: <R, E, B>(
 
 Added in v2.0.0
 
+## apFirstW
+
+Less strict version of [`apFirst`](#apfirst)
+
+**Signature**
+
+```ts
+export declare const apFirstW: <R2, E2, A, B>(
+  second: ReaderEither<R2, E2, B>
+) => <R1, E1>(first: ReaderEither<R1, E1, A>) => ReaderEither<R1 & R2, E2 | E1, A>
+```
+
+Added in v2.12.0
+
 ## apSecond
 
 Combine two effectful actions, keeping only the result of the second.
@@ -316,6 +332,20 @@ export declare const apSecond: <R, E, B>(
 
 Added in v2.0.0
 
+## apSecondW
+
+Less strict version of [`apSecond`](#apsecond)
+
+**Signature**
+
+```ts
+export declare const apSecondW: <R2, E2, A, B>(
+  second: ReaderEither<R2, E2, B>
+) => <R1, E1>(first: ReaderEither<R1, E1, A>) => ReaderEither<R1 & R2, E2 | E1, B>
+```
+
+Added in v2.12.0
+
 ## asksReaderEither
 
 Effectfully accesses the environment.

diff --git a/src/ReaderEither.ts b/src/ReaderEither.ts
@@ -596,6 +596,16 @@ export const apFirst =
   /*#__PURE__*/
   apFirst_(Apply)
 
+/**
+ * Less strict version of [`apFirst`](#apfirst)
+ *
+ * @category combinators
+ * @since 2.12.0
+ */
+export const apFirstW: <R2, E2, A, B>(
+  second: ReaderEither<R2, E2, B>
+) => <R1, E1>(first: ReaderEither<R1, E1, A>) => ReaderEither<R1 & R2, E1 | E2, A> = apFirst as any
+
 /**
  * Combine two effectful actions, keeping only the result of the second.
  *
@@ -608,6 +618,16 @@ export const apSecond =
   /*#__PURE__*/
   apSecond_(Apply)
 
+/**
+ * Less strict version of [`apSecond`](#apsecond)
+ *
+ * @category combinators
+ * @since 2.12.0
+ */
+export const apSecondW: <R2, E2, A, B>(
+  second: ReaderEither<R2, E2, B>
+) => <R1, E1>(first: ReaderEither<R1, E1, A>) => ReaderEither<R1 & R2, E1 | E2, B> = apSecond as any
+
 /**
  * @category instances
  * @since 2.7.0

diff --git a/test/ReaderEither.ts b/test/ReaderEither.ts
@@ -42,10 +42,22 @@ describe('ReaderEither', () => {
       U.deepStrictEqual(pipe(_.right('a'), _.apFirst(_.right('b')))({}), E.right('a'))
     })
 
+    it('apFirstW', () => {
+      const fa = _.right<{ readonly k: string }, 'Foo', string>('a')
+      const fb = _.right<{ readonly x: number }, 'Bar', number>(4)
+      U.deepStrictEqual(pipe(fa, _.apFirstW(fb))({ k: 'v', x: 1 }), E.right('a'))
+    })
+
     it('apSecond', () => {
       U.deepStrictEqual(pipe(_.right('a'), _.apSecond(_.right('b')))({}), E.right('b'))
     })
 
+    it('apSecondW', () => {
+      const fa = _.right<{ readonly k: string }, 'Foo', string>('a')
+      const fb = _.right<{ readonly x: number }, 'Bar', number>(4)
+      U.deepStrictEqual(pipe(fa, _.apSecondW(fb))({ k: 'v', x: 1 }), E.right(4))
+    })
+
     it('chainFirst', () => {
       const f = (n: number) => _.right(n * 2)
       U.deepStrictEqual(pipe(_.right(1), _.chainFirst(f))({}), E.right(1))