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• [DIR] ..
• [DIR] __flowtests__
• [FILE] ob1.d.ts
• [FILE] ob1.js
• [FILE] ob1.js.flow

Просмотр файла: ob1.js.flow

/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow strict-local
 * @format
 * @oncall react_native
 */

/* eslint-disable no-redeclare */

// A type representing 0-based offsets.
export opaque type Number0 = number;
// A type representing 1-based offsets.
export opaque type Number1 = number;

// Add two offsets or numbers.
declare function add(a: Number1, b: number): Number1;
declare function add(a: number, b: Number1): Number1;
declare function add(a: Number0, b: number): Number0;
declare function add(a: number, b: Number0): Number0;
declare function add(a: Number1, b: Number0): Number1;
declare function add(a: Number0, b: Number1): Number1;
declare function add(a: Number0, b: Number0): Number0;

export function add(a: number, b: number): number {
  return a + b;
}

// Subtract a number or 0-based offset from a 1/0-based offset.
declare function sub(a: Number1, b: number): Number1;
declare function sub(a: Number0, b: number): Number0;
declare function sub(a: number, b: Number0): Number0;
declare function sub(a: Number0, b: number): Number0;
declare function sub(a: Number1, b: Number0): Number1;
declare function sub(a: Number0, b: Number0): Number0;
declare function sub(a: Number1, b: Number1): Number0;

export function sub(a: number, b: number): number {
  return a - b;
}

// Get the underlying number of a 0-based offset, casting away the opaque type.
declare function get0(x: Number0): number;
declare function get0(x: void | null): void | null;
export function get0(x: number): number {
  return x;
}

// Get the underlying number of a 1-based offset, casting away the opaque type.
declare function get1(x: Number1): number;
declare function get1(x: void | null): void | null;
export function get1(x: number): number {
  return x;
}

// Add 1 to a 0-based offset, thus converting it to 1-based.
export function add1(x: Number0 | number): Number1 {
  return x + 1;
}

// Subtract 1 from a 1-based offset, thus converting it to 0-based.
export function sub1(x: Number1): Number0 {
  return x - 1;
}

// Negate a 0-based offset.
export function neg(x: Number0): Number0 {
  return -x;
}

// Cast a number to a 0-based offset.
export function add0(x: number): Number0 {
  return x;
}

// Increment a 0-based offset.
declare function inc(a: Number0): Number0;
// Increment a 1-based offset.
declare function inc(a: Number1): Number1;

export function inc(x: number): number {
  return x + 1;
}

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