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/** * @since 2.0.0 */ import type { TypeLambda } from "./HKT.js"; /** * @category type lambdas * @since 2.0.0 */ export interface FunctionTypeLambda extends TypeLambda { readonly type: (a: this["In"]) => this["Target"]; } /** * Tests if a value is a `function`. * * @example * ```ts * import * as assert from "node:assert" * import { isFunction } from "effect/Predicate" * * assert.deepStrictEqual(isFunction(isFunction), true) * assert.deepStrictEqual(isFunction("function"), false) * ``` * * @category guards * @since 2.0.0 */ export declare const isFunction: (input: unknown) => input is Function; /** * Creates a function that can be used in a data-last (aka `pipe`able) or * data-first style. * * The first parameter to `dual` is either the arity of the uncurried function * or a predicate that determines if the function is being used in a data-first * or data-last style. * * Using the arity is the most common use case, but there are some cases where * you may want to use a predicate. For example, if you have a function that * takes an optional argument, you can use a predicate to determine if the * function is being used in a data-first or data-last style. * * You can pass either the arity of the uncurried function or a predicate * which determines if the function is being used in a data-first or * data-last style. * * **Example** (Using arity to determine data-first or data-last style) * * ```ts * import { dual, pipe } from "effect/Function" * * const sum = dual< * (that: number) => (self: number) => number, * (self: number, that: number) => number * >(2, (self, that) => self + that) * * console.log(sum(2, 3)) // 5 * console.log(pipe(2, sum(3))) // 5 * ``` * * **Example** (Using call signatures to define the overloads) * * ```ts * import { dual, pipe } from "effect/Function" * * const sum: { * (that: number): (self: number) => number * (self: number, that: number): number * } = dual(2, (self: number, that: number): number => self + that) * * console.log(sum(2, 3)) // 5 * console.log(pipe(2, sum(3))) // 5 * ``` * * **Example** (Using a predicate to determine data-first or data-last style) * * ```ts * import { dual, pipe } from "effect/Function" * * const sum = dual< * (that: number) => (self: number) => number, * (self: number, that: number) => number * >( * (args) => args.length === 2, * (self, that) => self + that * ) * * console.log(sum(2, 3)) // 5 * console.log(pipe(2, sum(3))) // 5 * ``` * * @since 2.0.0 */ export declare const dual: { /** * Creates a function that can be used in a data-last (aka `pipe`able) or * data-first style. * * The first parameter to `dual` is either the arity of the uncurried function * or a predicate that determines if the function is being used in a data-first * or data-last style. * * Using the arity is the most common use case, but there are some cases where * you may want to use a predicate. For example, if you have a function that * takes an optional argument, you can use a predicate to determine if the * function is being used in a data-first or data-last style. * * You can pass either the arity of the uncurried function or a predicate * which determines if the function is being used in a data-first or * data-last style. * * **Example** (Using arity to determine data-first or data-last style) * * ```ts * import { dual, pipe } from "effect/Function" * * const sum = dual< * (that: number) => (self: number) => number, * (self: number, that: number) => number * >(2, (self, that) => self + that) * * console.log(sum(2, 3)) // 5 * console.log(pipe(2, sum(3))) // 5 * ``` * * **Example** (Using call signatures to define the overloads) * * ```ts * import { dual, pipe } from "effect/Function" * * const sum: { * (that: number): (self: number) => number * (self: number, that: number): number * } = dual(2, (self: number, that: number): number => self + that) * * console.log(sum(2, 3)) // 5 * console.log(pipe(2, sum(3))) // 5 * ``` * * **Example** (Using a predicate to determine data-first or data-last style) * * ```ts * import { dual, pipe } from "effect/Function" * * const sum = dual< * (that: number) => (self: number) => number, * (self: number, that: number) => number * >( * (args) => args.length === 2, * (self, that) => self + that * ) * * console.log(sum(2, 3)) // 5 * console.log(pipe(2, sum(3))) // 5 * ``` * * @since 2.0.0 */ <DataLast extends (...args: Array<any>) => any, DataFirst extends (...args: Array<any>) => any>(arity: Parameters<DataFirst>["length"], body: DataFirst): DataLast & DataFirst; /** * Creates a function that can be used in a data-last (aka `pipe`able) or * data-first style. * * The first parameter to `dual` is either the arity of the uncurried function * or a predicate that determines if the function is being used in a data-first * or data-last style. * * Using the arity is the most common use case, but there are some cases where * you may want to use a predicate. For example, if you have a function that * takes an optional argument, you can use a predicate to determine if the * function is being used in a data-first or data-last style. * * You can pass either the arity of the uncurried function or a predicate * which determines if the function is being used in a data-first or * data-last style. * * **Example** (Using arity to determine data-first or data-last style) * * ```ts * import { dual, pipe } from "effect/Function" * * const sum = dual< * (that: number) => (self: number) => number, * (self: number, that: number) => number * >(2, (self, that) => self + that) * * console.log(sum(2, 3)) // 5 * console.log(pipe(2, sum(3))) // 5 * ``` * * **Example** (Using call signatures to define the overloads) * * ```ts * import { dual, pipe } from "effect/Function" * * const sum: { * (that: number): (self: number) => number * (self: number, that: number): number * } = dual(2, (self: number, that: number): number => self + that) * * console.log(sum(2, 3)) // 5 * console.log(pipe(2, sum(3))) // 5 * ``` * * **Example** (Using a predicate to determine data-first or data-last style) * * ```ts * import { dual, pipe } from "effect/Function" * * const sum = dual< * (that: number) => (self: number) => number, * (self: number, that: number) => number * >( * (args) => args.length === 2, * (self, that) => self + that * ) * * console.log(sum(2, 3)) // 5 * console.log(pipe(2, sum(3))) // 5 * ``` * * @since 2.0.0 */ <DataLast extends (...args: Array<any>) => any, DataFirst extends (...args: Array<any>) => any>(isDataFirst: (args: IArguments) => boolean, body: DataFirst): DataLast & DataFirst; }; /** * Apply a function to given values. * * @example * ```ts * import * as assert from "node:assert" * import { pipe, apply } from "effect/Function" * import { length } from "effect/String" * * assert.deepStrictEqual(pipe(length, apply("hello")), 5) * ``` * * @since 2.0.0 */ export declare const apply: <A extends ReadonlyArray<unknown>>(...a: A) => <B>(self: (...a: A) => B) => B; /** * A lazy argument. * * @example * ```ts * import * as assert from "node:assert" * import { LazyArg, constant } from "effect/Function" * * const constNull: LazyArg<null> = constant(null) * ``` * * @since 2.0.0 */ export interface LazyArg<A> { (): A; } /** * @example * ```ts * import * as assert from "node:assert" * import { FunctionN } from "effect/Function" * * const sum: FunctionN<[number, number], number> = (a, b) => a + b * ``` * * @since 2.0.0 */ export interface FunctionN<A extends ReadonlyArray<unknown>, B> { (...args: A): B; } /** * The identity function, i.e. A function that returns its input argument. * * @example * ```ts * import * as assert from "node:assert" * import { identity } from "effect/Function" * * assert.deepStrictEqual(identity(5), 5) * ``` * * @since 2.0.0 */ export declare const identity: <A>(a: A) => A; /** * A function that ensures that the type of an expression matches some type, * without changing the resulting type of that expression. * * @example * ```ts * import * as assert from "node:assert" * import { satisfies } from "effect/Function" * * const test1 = satisfies<number>()(5 as const) * //^? const test: 5 * // @ts-expect-error * const test2 = satisfies<string>()(5) * //^? Argument of type 'number' is not assignable to parameter of type 'string' * * assert.deepStrictEqual(satisfies<number>()(5), 5) * ``` * * @since 2.0.0 */ export declare const satisfies: <A>() => <B extends A>(b: B) => B; /** * Casts the result to the specified type. * * @example * ```ts * import * as assert from "node:assert" * import { unsafeCoerce, identity } from "effect/Function" * * assert.deepStrictEqual(unsafeCoerce, identity) * ``` * * @since 2.0.0 */ export declare const unsafeCoerce: <A, B>(a: A) => B; /** * Creates a constant value that never changes. * * This is useful when you want to pass a value to a higher-order function (a function that takes another function as its argument) * and want that inner function to always use the same value, no matter how many times it is called. * * @example * ```ts * import * as assert from "node:assert" * import { constant } from "effect/Function" * * const constNull = constant(null) * * assert.deepStrictEqual(constNull(), null) * assert.deepStrictEqual(constNull(), null) * ``` * * @since 2.0.0 */ export declare const constant: <A>(value: A) => LazyArg<A>; /** * A thunk that returns always `true`. * * @example * ```ts * import * as assert from "node:assert" * import { constTrue } from "effect/Function" * * assert.deepStrictEqual(constTrue(), true) * ``` * * @since 2.0.0 */ export declare const constTrue: LazyArg<boolean>; /** * A thunk that returns always `false`. * * @example * ```ts * import * as assert from "node:assert" * import { constFalse } from "effect/Function" * * assert.deepStrictEqual(constFalse(), false) * ``` * * @since 2.0.0 */ export declare const constFalse: LazyArg<boolean>; /** * A thunk that returns always `null`. * * @example * ```ts * import * as assert from "node:assert" * import { constNull } from "effect/Function" * * assert.deepStrictEqual(constNull(), null) * ``` * * @since 2.0.0 */ export declare const constNull: LazyArg<null>; /** * A thunk that returns always `undefined`. * * @example * ```ts * import * as assert from "node:assert" * import { constUndefined } from "effect/Function" * * assert.deepStrictEqual(constUndefined(), undefined) * ``` * * @since 2.0.0 */ export declare const constUndefined: LazyArg<undefined>; /** * A thunk that returns always `void`. * * @example * ```ts * import * as assert from "node:assert" * import { constVoid } from "effect/Function" * * assert.deepStrictEqual(constVoid(), undefined) * ``` * * @since 2.0.0 */ export declare const constVoid: LazyArg<void>; /** * Reverses the order of arguments for a curried function. * * @example * ```ts * import * as assert from "node:assert" * import { flip } from "effect/Function" * * const f = (a: number) => (b: string) => a - b.length * * assert.deepStrictEqual(flip(f)('aaa')(2), -1) * ``` * * @since 2.0.0 */ export declare const flip: <A extends Array<unknown>, B extends Array<unknown>, C>(f: (...a: A) => (...b: B) => C) => (...b: B) => (...a: A) => C; /** * Composes two functions, `ab` and `bc` into a single function that takes in an argument `a` of type `A` and returns a result of type `C`. * The result is obtained by first applying the `ab` function to `a` and then applying the `bc` function to the result of `ab`. * * @example * ```ts * import * as assert from "node:assert" * import { compose } from "effect/Function" * * const increment = (n: number) => n + 1; * const square = (n: number) => n * n; * * assert.strictEqual(compose(increment, square)(2), 9); * ``` * * @since 2.0.0 */ export declare const compose: { /** * Composes two functions, `ab` and `bc` into a single function that takes in an argument `a` of type `A` and returns a result of type `C`. * The result is obtained by first applying the `ab` function to `a` and then applying the `bc` function to the result of `ab`. * * @example * ```ts * import * as assert from "node:assert" * import { compose } from "effect/Function" * * const increment = (n: number) => n + 1; * const square = (n: number) => n * n; * * assert.strictEqual(compose(increment, square)(2), 9); * ``` * * @since 2.0.0 */ <B, C>(bc: (b: B) => C): <A>(self: (a: A) => B) => (a: A) => C; /** * Composes two functions, `ab` and `bc` into a single function that takes in an argument `a` of type `A` and returns a result of type `C`. * The result is obtained by first applying the `ab` function to `a` and then applying the `bc` function to the result of `ab`. * * @example * ```ts * import * as assert from "node:assert" * import { compose } from "effect/Function" * * const increment = (n: number) => n + 1; * const square = (n: number) => n * n; * * assert.strictEqual(compose(increment, square)(2), 9); * ``` * * @since 2.0.0 */ <A, B, C>(self: (a: A) => B, bc: (b: B) => C): (a: A) => C; }; /** * The `absurd` function is a stub for cases where a value of type `never` is encountered in your code, * meaning that it should be impossible for this code to be executed. * * This function is particularly useful when it's necessary to specify that certain cases are impossible. * * @since 2.0.0 */ export declare const absurd: <A>(_: never) => A; /** * Creates a version of this function: instead of `n` arguments, it accepts a single tuple argument. * * @example * ```ts * import * as assert from "node:assert" * import { tupled } from "effect/Function" * * const sumTupled = tupled((x: number, y: number): number => x + y) * * assert.deepStrictEqual(sumTupled([1, 2]), 3) * ``` * * @since 2.0.0 */ export declare const tupled: <A extends ReadonlyArray<unknown>, B>(f: (...a: A) => B) => (a: A) => B; /** * Inverse function of `tupled` * * @example * ```ts * import * as assert from "node:assert" * import { untupled } from "effect/Function" * * const getFirst = untupled(<A, B>(tuple: [A, B]): A => tuple[0]) * * assert.deepStrictEqual(getFirst(1, 2), 1) * ``` * * @since 2.0.0 */ export declare const untupled: <A extends ReadonlyArray<unknown>, B>(f: (a: A) => B) => (...a: A) => B; /** * Pipes the value of an expression into a pipeline of functions. * * **Details** * * The `pipe` function is a utility that allows us to compose functions in a * readable and sequential manner. It takes the output of one function and * passes it as the input to the next function in the pipeline. This enables us * to build complex transformations by chaining multiple functions together. * * ```ts skip-type-checking * import { pipe } from "effect" * * const result = pipe(input, func1, func2, ..., funcN) * ``` * * In this syntax, `input` is the initial value, and `func1`, `func2`, ..., * `funcN` are the functions to be applied in sequence. The result of each * function becomes the input for the next function, and the final result is * returned. * * Here's an illustration of how `pipe` works: * * ``` * ┌───────┐ ┌───────┐ ┌───────┐ ┌───────┐ ┌───────┐ ┌────────┐ * │ input │───►│ func1 │───►│ func2 │───►│ ... │───►│ funcN │───►│ result │ * └───────┘ └───────┘ └───────┘ └───────┘ └───────┘ └────────┘ * ``` * * It's important to note that functions passed to `pipe` must have a **single * argument** because they are only called with a single argument. * * **When to Use** * * This is useful in combination with data-last functions as a simulation of * methods: * * ```ts skip-type-checking * as.map(f).filter(g) * ``` * * becomes: * * ```ts skip-type-checking * import { pipe, Array } from "effect" * * pipe(as, Array.map(f), Array.filter(g)) * ``` * * **Example** (Chaining Arithmetic Operations) * * ```ts * import { pipe } from "effect" * * // Define simple arithmetic operations * const increment = (x: number) => x + 1 * const double = (x: number) => x * 2 * const subtractTen = (x: number) => x - 10 * * // Sequentially apply these operations using `pipe` * const result = pipe(5, increment, double, subtractTen) * * console.log(result) * // Output: 2 * ``` * * @since 2.0.0 */ export declare function pipe<A>(a: A): A; export declare function pipe<A, B = never>(a: A, ab: (a: A) => B): B; export declare function pipe<A, B = never, C = never>(a: A, ab: (a: A) => B, bc: (b: B) => C): C; export declare function pipe<A, B = never, C = never, D = never>(a: A, ab: (a: A) => B, bc: (b: B) => C, cd: (c: C) => D): D; export declare function pipe<A, B = never, C = never, D = never, E = never>(a: A, ab: (a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E): E; export declare function pipe<A, B = never, C = never, D = never, E = never, F = never>(a: A, ab: (a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E, ef: (e: E) => F): F; export declare function pipe<A, B = never, C = never, D = never, E = never, F = never, G = never>(a: A, ab: (a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E, ef: (e: E) => F, fg: (f: F) => G): G; export declare function pipe<A, B = never, C = never, D = never, E = never, F = never, G = never, H = never>(a: A, ab: (a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E, ef: (e: E) => F, fg: (f: F) => G, gh: (g: G) => H): H; export declare function pipe<A, B = never, C = never, D = never, E = never, F = never, G = never, H = never, I = never>(a: A, ab: (a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E, ef: (e: E) => F, fg: (f: F) => G, gh: (g: G) => H, hi: (h: H) => I): I; export declare function pipe<A, B = never, C = never, D = never, E = never, F = never, G = never, H = never, I = never, J = never>(a: A, ab: (a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E, ef: (e: E) => F, fg: (f: F) => G, gh: (g: G) => H, hi: (h: H) => I, ij: (i: I) => J): J; export declare function pipe<A, B = never, C = never, D = never, E = never, F = never, G = never, H = never, I = never, J = never, K = never>(a: A, ab: (a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E, ef: (e: E) => F, fg: (f: F) => G, gh: (g: G) => H, hi: (h: H) => I, ij: (i: I) => J, jk: (j: J) => K): K; export declare function pipe<A, B = never, C = never, D = never, E = never, F = never, G = never, H = never, I = never, J = never, K = never, L = never>(a: A, ab: (a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E, ef: (e: E) => F, fg: (f: F) => G, gh: (g: G) => H, hi: (h: H) => I, ij: (i: I) => J, jk: (j: J) => K, kl: (k: K) => L): L; export declare function pipe<A, B = never, C = never, D = never, E = never, F = never, G = never, H = never, I = never, J = never, K = never, L = never, M = never>(a: A, ab: (a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E, ef: (e: E) => F, fg: (f: F) => G, gh: (g: G) => H, hi: (h: H) => I, ij: (i: I) => J, jk: (j: J) => K, kl: (k: K) => L, lm: (l: L) => M): M; export declare function pipe<A, B = never, C = never, D = never, E = never, F = never, G = never, H = never, I = never, J = never, K = never, L = never, M = never, N = never>(a: A, ab: (a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E, ef: (e: E) => F, fg: (f: F) => G, gh: (g: G) => H, hi: (h: H) => I, ij: (i: I) => J, jk: (j: J) => K, kl: (k: K) => L, lm: (l: L) => M, mn: (m: M) => N): N; export declare function pipe<A, B = never, C = never, D = never, E = never, F = never, G = never, H = never, I = never, J = never, K = never, L = never, M = never, N = never, O = never>(a: A, ab: (a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E, ef: (e: E) => F, fg: (f: F) => G, gh: (g: G) => H, hi: (h: H) => I, ij: (i: I) => J, jk: (j: J) => K, kl: (k: K) => L, lm: (l: L) => M, mn: (m: M) => N, no: (n: N) => O): O; export declare function pipe<A, B = never, C = never, D = never, E = never, F = never, G = never, H = never, I = never, J = never, K = never, L = never, M = never, N = never, O = never, P = never>(a: A, ab: (a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E, ef: (e: E) => F, fg: (f: F) => G, gh: (g: G) => H, hi: (h: H) => I, ij: (i: I) => J, jk: (j: J) => K, kl: (k: K) => L, lm: (l: L) => M, mn: (m: M) => N, no: (n: N) => O, op: (o: O) => P): P; export declare function pipe<A, B = never, C = never, D = never, E = never, F = never, G = never, H = never, I = never, J = never, K = never, L = never, M = never, N = never, O = never, P = never, Q = never>(a: A, ab: (a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E, ef: (e: E) => F, fg: (f: F) => G, gh: (g: G) => H, hi: (h: H) => I, ij: (i: I) => J, jk: (j: J) => K, kl: (k: K) => L, lm: (l: L) => M, mn: (m: M) => N, no: (n: N) => O, op: (o: O) => P, pq: (p: P) => Q): Q; export declare function pipe<A, B = never, C = never, D = never, E = never, F = never, G = never, H = never, I = never, J = never, K = never, L = never, M = never, N = never, O = never, P = never, Q = never, R = never>(a: A, ab: (a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E, ef: (e: E) => F, fg: (f: F) => G, gh: (g: G) => H, hi: (h: H) => I, ij: (i: I) => J, jk: (j: J) => K, kl: (k: K) => L, lm: (l: L) => M, mn: (m: M) => N, no: (n: N) => O, op: (o: O) => P, pq: (p: P) => Q, qr: (q: Q) => R): R; export declare function pipe<A, B = never, C = never, D = never, E = never, F = never, G = never, H = never, I = never, J = never, K = never, L = never, M = never, N = never, O = never, P = never, Q = never, R = never, S = never>(a: A, ab: (a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E, ef: (e: E) => F, fg: (f: F) => G, gh: (g: G) => H, hi: (h: H) => I, ij: (i: I) => J, jk: (j: J) => K, kl: (k: K) => L, lm: (l: L) => M, mn: (m: M) => N, no: (n: N) => O, op: (o: O) => P, pq: (p: P) => Q, qr: (q: Q) => R, rs: (r: R) => S): S; export declare function pipe<A, B = never, C = never, D = never, E = never, F = never, G = never, H = never, I = never, J = never, K = never, L = never, M = never, N = never, O = never, P = never, Q = never, R = never, S = never, T = never>(a: A, ab: (a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E, ef: (e: E) => F, fg: (f: F) => G, gh: (g: G) => H, hi: (h: H) => I, ij: (i: I) => J, jk: (j: J) => K, kl: (k: K) => L, lm: (l: L) => M, mn: (m: M) => N, no: (n: N) => O, op: (o: O) => P, pq: (p: P) => Q, qr: (q: Q) => R, rs: (r: R) => S, st: (s: S) => T): T; /** * Performs left-to-right function composition. The first argument may have any arity, the remaining arguments must be unary. * * See also [`pipe`](#pipe). * * @example * ```ts * import * as assert from "node:assert" * import { flow } from "effect/Function" * * const len = (s: string): number => s.length * const double = (n: number): number => n * 2 * * const f = flow(len, double) * * assert.strictEqual(f('aaa'), 6) * ``` * * @since 2.0.0 */ export declare function flow<A extends ReadonlyArray<unknown>, B = never>(ab: (...a: A) => B): (...a: A) => B; export declare function flow<A extends ReadonlyArray<unknown>, B = never, C = never>(ab: (...a: A) => B, bc: (b: B) => C): (...a: A) => C; export declare function flow<A extends ReadonlyArray<unknown>, B = never, C = never, D = never>(ab: (...a: A) => B, bc: (b: B) => C, cd: (c: C) => D): (...a: A) => D; export declare function flow<A extends ReadonlyArray<unknown>, B = never, C = never, D = never, E = never>(ab: (...a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E): (...a: A) => E; export declare function flow<A extends ReadonlyArray<unknown>, B = never, C = never, D = never, E = never, F = never>(ab: (...a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E, ef: (e: E) => F): (...a: A) => F; export declare function flow<A extends ReadonlyArray<unknown>, B = never, C = never, D = never, E = never, F = never, G = never>(ab: (...a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E, ef: (e: E) => F, fg: (f: F) => G): (...a: A) => G; export declare function flow<A extends ReadonlyArray<unknown>, B = never, C = never, D = never, E = never, F = never, G = never, H = never>(ab: (...a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E, ef: (e: E) => F, fg: (f: F) => G, gh: (g: G) => H): (...a: A) => H; export declare function flow<A extends ReadonlyArray<unknown>, B = never, C = never, D = never, E = never, F = never, G = never, H = never, I = never>(ab: (...a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E, ef: (e: E) => F, fg: (f: F) => G, gh: (g: G) => H, hi: (h: H) => I): (...a: A) => I; export declare function flow<A extends ReadonlyArray<unknown>, B = never, C = never, D = never, E = never, F = never, G = never, H = never, I = never, J = never>(ab: (...a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E, ef: (e: E) => F, fg: (f: F) => G, gh: (g: G) => H, hi: (h: H) => I, ij: (i: I) => J): (...a: A) => J; /** * Type hole simulation. * * @since 2.0.0 */ export declare const hole: <T>() => T; /** * The SK combinator, also known as the "S-K combinator" or "S-combinator", is a fundamental combinator in the * lambda calculus and the SKI combinator calculus. * * This function is useful for discarding the first argument passed to it and returning the second argument. * * @example * ```ts * import * as assert from "node:assert" * import { SK } from "effect/Function"; * * assert.deepStrictEqual(SK(0, "hello"), "hello") * ``` * * @since 2.0.0 */ export declare const SK: <A, B>(_: A, b: B) => B; //# sourceMappingURL=Function.d.ts.map