/**
 * Environment definitions for compiling AssemblyScript to JavaScript using tsc.
 *
 * Note that semantic differences require additional explicit conversions for full compatibility.
 * For example, when casting an i32 to an u8, doing `<u8>(someI32 & 0xff)` will yield the same
 * result when compiling to WebAssembly or JS while `<u8>someI32` alone does nothing in JS.
 *
 * Note that i64's are not portable (JS numbers are IEEE754 doubles with a maximum safe integer
 * value of 2^53-1) and instead require a compatibility layer to work in JS as well, as for example
 * {@link glue/js/i64} respectively {@link glue/wasm/i64}.
 *
 * @module std/portable
 *//***/

// Types

declare type bool = boolean;
declare type i8 = number;
declare type i16 = number;
declare type i32 = number;
declare type isize = number;
declare type u8 = number;
declare type u16 = number;
declare type u32 = number;
declare type usize = number;
declare type f32 = number;
declare type f64 = number;

/** Special type evaluating the indexed access index type. */
declare type indexof<T extends unknown[]> = keyof T;
/** Special type evaluating the indexed access value type. */
declare type valueof<T extends unknown[]> = T[0];

// Compiler hints

/** Compiler target. 0 = JS, 1 = WASM32, 2 = WASM64. */
declare const ASC_TARGET: i32;
/** Provided noAssert option. */
declare const ASC_NO_ASSERT: bool;
/** Provided memoryBase option. */
declare const ASC_MEMORY_BASE: i32;
/** Provided optimizeLevel option. */
declare const ASC_OPTIMIZE_LEVEL: i32;
/** Provided shrinkLevel option. */
declare const ASC_SHRINK_LEVEL: i32;
/** Whether the mutable global feature is enabled. */
declare const ASC_FEATURE_MUTABLE_GLOBAL: bool;
/** Whether the sign extension feature is enabled. */
declare const ASC_FEATURE_SIGN_EXTENSION: bool;

// Builtins

/** Performs the sign-agnostic count leading zero bits operation on a 32-bit integer. All zero bits are considered leading if the value is zero. */
declare function clz<T = i32>(value: T): T;
/** Performs the sign-agnostic count tailing zero bits operation on a 32-bit integer. All zero bits are considered trailing if the value is zero. */
declare function ctz<T = i32>(value: T): T;
/** Performs the sign-agnostic count number of one bits operation on a 32-bit integer. */
declare function popcnt<T = i32>(value: T): T;
/** Performs the sign-agnostic rotate left operation on a 32-bit integer. */
declare function rotl<T = i32>(value: T, shift: T): T;
/** Performs the sign-agnostic rotate right operation on a 32-bit integer. */
declare function rotr<T = i32>(value: T, shift: T): T;
/** Computes the absolute value of an integer or float. */
declare function abs<T = i32 | f32 | f64>(value: T): T;
/** Determines the maximum of two integers or floats. If either operand is `NaN`, returns `NaN`. */
declare function max<T = i32 | f32 | f64>(left: T, right: T): T;
/** Determines the minimum of two integers or floats. If either operand is `NaN`, returns `NaN`. */
declare function min<T = i32 | f32 | f64>(left: T, right: T): T;
/** Composes a 32-bit or 64-bit float from the magnitude of `x` and the sign of `y`. */
declare function copysign<T = f32 | f64>(x: T, y: T): T;
/** Performs the ceiling operation on a 32-bit or 64-bit float. */
declare function ceil<T = f32 | f64>(value: T): T;
/** Performs the floor operation on a 32-bit or 64-bit float. */
declare function floor<T = f32 | f64>(value: T): T;
/** Rounds to the nearest integer tied to even of a 32-bit or 64-bit float. */
declare function nearest<T = f32 | f64>(value: T): T;
/** Selects one of two pre-evaluated values depending on the condition. */
declare function select<T>(ifTrue: T, ifFalse: T, condition: bool): T;
/** Calculates the square root of a 32-bit or 64-bit float. */
declare function sqrt<T = f32 | f64>(value: T): T;
/** Rounds to the nearest integer towards zero of a 32-bit or 64-bit float. */
declare function trunc<T = f32 | f64>(value: T): T;
/** Loads a value of the specified type from memory. Type must be `u8`. */
declare function load<T = u8>(ptr: usize, constantOffset?: usize): T;
/** Stores a value of the specified type to memory. Type must be `u8`. */
declare function store<T = u8>(ptr: usize, value: T, constantOffset?: usize): void;
/** Emits an unreachable operation that results in a runtime error when executed. */
declare function unreachable(): any; // sic

/** Changes the type of any value of `usize` kind to another one of `usize` kind. Useful for casting class instances to their pointer values and vice-versa. Beware that this is unsafe.*/
declare function changetype<T>(value: any): T;
/** Explicitly requests no bounds checks on the provided expression. Useful for array accesses. */
declare function unchecked<T>(value: T): T;
/** Tests if the specified value is a valid integer. Can't distinguish an integer from an integral float. */
declare function isInteger(value: any): value is number;
/** Tests if the specified value is a valid float. Can't distinguish a float from an integer. */
declare function isFloat(value: any): value is number;
/** Tests if the specified value is of a nullable reference type. */
declare function isNullable(value: any): bool;
/** Tests if the specified value is of a reference type. */
declare function isReference(value: any): value is object | string;
/** Tests if the specified value is of a function type */
declare function isFunction(value: any): value is Function;
/** Tests if the specified value can be used as a string. */
declare function isString(value: any): value is string | String;
/** Tests if the specified value can be used as an array. */
declare function isArray(value: any): value is Array<any>;
/** Tests if the specified type *or* expression can be used as an array like object. */
declare function isArrayLike(value: any): value is ArrayLike<any>;
/** Tests if the specified expression resolves to a defined element. */
declare function isDefined(expression: any): bool;
/** Tests if the specified expression evaluates to a constant value. */
declare function isConstant(expression: any): bool;
/** Traps if the specified value is not true-ish, otherwise returns the value. */
declare function assert<T>(isTrueish: T | null, message?: string): T;
/** Parses an integer string to a 64-bit float. */
declare function parseInt(str: string, radix?: i32): f64;
/** Parses a floating point string to a 64-bit float. */
declare function parseFloat(str: string): f64;
/** Returns the 64-bit floating-point remainder of `x/y`. */
declare function fmod(x: f64, y: f64): f64;
/** Returns the 32-bit floating-point remainder of `x/y`. */
declare function fmodf(x: f32, y: f32): f32;

/** Converts any other numeric value to an 8-bit signed integer. */
declare function i8(value: any): i8;
declare namespace i8 {
  /** Smallest representable value. */
  export const MIN_VALUE: i8;
  /** Largest representable value. */
  export const MAX_VALUE: i8;
  /** Converts a string to a floating-point number and cast to target integer after. */
  export function parseFloat(string: string): i8;
  /** Converts A string to an integer. */
  export function parseInt(string: string, radix?: i32): i8;
}
/** Converts any other numeric value to a 16-bit signed integer. */
declare function i16(value: any): i16;
declare namespace i16 {
  /** Smallest representable value. */
  export const MIN_VALUE: i16;
  /** Largest representable value. */
  export const MAX_VALUE: i16;
  /** Converts a string to a floating-point number and cast to target integer after. */
  export function parseFloat(string: string): i16;
  /** Converts A string to an integer. */
  export function parseInt(string: string, radix?: i32): i16;
}
/** Converts any other numeric value to a 32-bit signed integer. */
declare function i32(value: any): i32;
declare namespace i32 {
  /** Smallest representable value. */
  export const MIN_VALUE: i32;
  /** Largest representable value. */
  export const MAX_VALUE: i32;
  /** Converts a string to a floating-point number and cast to target integer after. */
  export function parseFloat(string: string): i32;
  /** Converts A string to an integer. */
  export function parseInt(string: string, radix?: i32): i32;
}
/** Converts any other numeric value to a 32-bit (in WASM32) respectivel 64-bit (in WASM64) signed integer. */
declare function isize(value: any): isize;
declare namespace isize {
  /** Smallest representable value. */
  export const MIN_VALUE: isize;
  /** Largest representable value. */
  export const MAX_VALUE: isize;
  /** Converts a string to a floating-point number and cast to target integer after. */
  export function parseFloat(string: string): isize;
  /** Converts A string to an integer. */
  export function parseInt(string: string, radix?: i32): isize;
}
/** Converts any other numeric value to an 8-bit unsigned integer. */
declare function u8(value: any): u8;
declare namespace u8 {
  /** Smallest representable value. */
  export const MIN_VALUE: u8;
  /** Largest representable value. */
  export const MAX_VALUE: u8;
  /** Converts a string to a floating-point number and cast to target integer after. */
  export function parseFloat(string: string): u8;
  /** Converts A string to an integer. */
  export function parseInt(string: string, radix?: i32): u8;
}
/** Converts any other numeric value to a 16-bit unsigned integer. */
declare function u16(value: any): u16;
declare namespace u16 {
  /** Smallest representable value. */
  export const MIN_VALUE: u16;
  /** Largest representable value. */
  export const MAX_VALUE: u16;
  /** Converts a string to a floating-point number and cast to target integer after. */
  export function parseFloat(string: string): u16;
  /** Converts A string to an integer. */
  export function parseInt(string: string, radix?: i32): u16;
}
/** Converts any other numeric value to a 32-bit unsigned integer. */
declare function u32(value: any): u32;
declare namespace u32 {
  /** Smallest representable value. */
  export const MIN_VALUE: u32;
  /** Largest representable value. */
  export const MAX_VALUE: u32;
  /** Converts a string to a floating-point number and cast to target integer after. */
  export function parseFloat(string: string): u32;
  /** Converts A string to an integer. */
  export function parseInt(string: string, radix?: i32): u32;
}
/** Converts any other numeric value to a 32-bit (in WASM32) respectivel 64-bit (in WASM64) unsigned integer. */
declare function usize(value: any): isize;
declare namespace usize {
  /** Smallest representable value. */
  export const MIN_VALUE: usize;
  /** Largest representable value. */
  export const MAX_VALUE: usize;
  /** Converts a string to a floating-point number and cast to target integer after. */
  export function parseFloat(string: string): usize;
  /** Converts A string to an integer. */
  export function parseInt(string: string, radix?: i32): usize;
}
/** Converts any other numeric value to a 1-bit unsigned integer. */
declare function bool(value: any): bool;
declare namespace bool {
  /** Smallest representable value. */
  export const MIN_VALUE: bool;
  /** Largest representable value. */
  export const MAX_VALUE: bool;
}
/** Converts any other numeric value to a 32-bit float. */
declare function f32(value: any): f32;
declare namespace f32 {
  /** Smallest representable value. */
  export const MIN_VALUE: f32;
  /** Largest representable value. */
  export const MAX_VALUE: f32;
  /** Smallest normalized positive value. */
  export const MIN_POSITIVE_VALUE: f32;
  /** Smallest safely representable integer value. */
  export const MIN_SAFE_INTEGER: f32;
  /** Largest safely representable integer value. */
  export const MAX_SAFE_INTEGER: f32;
  /** Difference between 1 and the smallest representable value greater than 1. */
  export const EPSILON: f32;
  /** Returns a boolean value that indicates whether a value is the reserved value NaN (not a number). */
  export function isNaN(value: f32): bool;
  /** Returns true if passed value is finite. */
  export function isFinite(value: f32): bool;
  /** Returns true if the value passed is a safe integer. */
  export function isSafeInteger(value: f32): bool;
  /** Returns true if the value passed is an integer, false otherwise. */
  export function isInteger(value: f32): bool;
  /** Converts a string to a floating-point number. */
  export function parseFloat(string: string): f32;
  /** Converts A string to an integer. */
  export function parseInt(string: string, radix?: i32): f32;
}
/** Converts any other numeric value to a 64-bit float. */
declare function f64(value: any): f64;
declare namespace f64 {
  /** Smallest representable value. */
  export const MIN_VALUE: f64;
  /** Largest representable value. */
  export const MAX_VALUE: f64;
  /** Smallest normalized positive value. */
  export const MIN_POSITIVE_VALUE: f64;
  /** Smallest safely representable integer value. */
  export const MIN_SAFE_INTEGER: f64;
  /** Largest safely representable integer value. */
  export const MAX_SAFE_INTEGER: f64;
  /** Difference between 1 and the smallest representable value greater than 1. */
  export const EPSILON: f64;
  /** Returns a boolean value that indicates whether a value is the reserved value NaN (not a number). */
  export function isNaN(value: f32): bool;
  /** Returns true if passed value is finite. */
  export function isFinite(value: f32): bool;
  /** Returns true if the value passed is a safe integer. */
  export function isSafeInteger(value: f64): bool;
  /** Returns true if the value passed is an integer, false otherwise. */
  export function isInteger(value: f64): bool;
  /** Converts a string to a floating-point number. */
  export function parseFloat(string: string): f64;
  /** Converts A string to an integer. */
  export function parseInt(string: string, radix?: i32): f64;
}

// Polyfills

/** [Polyfill] Performs the sign-agnostic reverse bytes **/
declare function bswap<T = i32 | u32 | isize | usize>(value: T): T;
/** [Polyfill] Performs the sign-agnostic reverse bytes only for last 16-bit **/
declare function bswap16<T = i16 | u16 | i32 | u32>(value: T): T;

// Standard library

/** Memory operations. */
declare namespace memory {
  /** Allocates a chunk of memory of the specified size and returns a pointer to it. */
  function allocate(size: usize): usize;
  /** Disposes a chunk of memory by its pointer. */
  function free(ptr: usize): void;
  /** Copies n bytes from the specified source to the specified destination in memory. These regions may overlap. */
  function copy(dst: usize, src: usize, n: usize): void;
  /** Fills size bytes from from the specified destination by same value in memory. */
  function fill(dst: usize, value: u8, size: usize): void;
  /** Resets the allocator to its initial state, if supported. */
  function reset(): void;
}

declare const Mathf: typeof Math;
declare const JSMath: typeof Math;

declare interface StringConstructor {
  /** Equivalent to calling `String.fromCharCode` with multiple arguments. */
  fromCharCodes(arr: u16[]): string;
  /** Equivalent to calling `String.fromCodePoint` with multiple arguments. */
  fromCodePoints(arr: i32[]): string;
}

/** Annotates a class as being unmanaged with limited capabilities. */
declare function unmanaged(constructor: Function): void;
