JsExt

Additional functions for JavaScript programming in practice.

Install

npm i @ayonli/jsext

Usages

import jsext from "@ayonli/jsext";

Note: this package works well in both CommonJS and ES Module.

Functions

• try<E = Error, T = any, A extends any[] = any[], TReturn = any, TNext = unknown>(fn: (...args: A) => AsyncGenerator<T, TReturn, TNext>, ...args: A): AsyncGenerator<[E, T], [E, TReturn], TNext>

• try<E = Error, T = any, A extends any[] = any[], TReturn = any, TNext = unknown>(fn: (...args: A) => Generator<T, TReturn, TNext>, ...args: A): Generator<[E, T], [E, TReturn], TNext>

• try<E = Error, R = any, A extends any[] = any[]>(fn: (...args: A) => Promise<R>, ...args: A): Promise<[E, R]>

• try<E = Error, R = any, A extends any[] = any[]>(fn: (...args: A) => R, ...args: A): [E, R]

• try<E = Error, T = any, TReturn = any, TNext = unknown>(gen: AsyncGenerator<T, TReturn, TNext>): AsyncGenerator<[E, T], [E, TReturn], TNext>

• try<E = Error, T = any, TReturn = any, TNext = unknown>(gen: Generator<T, TReturn, TNext>): Generator<[E, T], [E, TReturn], TNext>

• try<E = Error, R = any>(job: Promise<R>): Promise<[E, R]>

• func<T, R = any, A extends any[] = any[]>(fn: (this: T, defer: (cb: () => void) => void, ...args: A) => R): (this: T, ...args: A) => R

• wrap<T, Fn extends (this: T, ...args: any[]) => any>(fn: Fn, wrapper: (this: T, fn: Fn, ...args: Parameters<Fn>) => ReturnType<Fn>): Fn

• throttle<T, Fn extends (this: T, ...args: any[]) => any>(handler: Fn, duration: number): Fn

• throttle<T, Fn extends (this: T, ...args: any[]) => any>(handler: Fn, options: { duration: number; for?: any }): Fn

• mixins<T extends Constructor<any>, M extends any[]>(base: T, ...mixins: { [X in keyof M]: Constructor<M[X]> }): T & Constructor<UnionToIntersection<FlatArray<M, 1>>>

• mixins<T extends Constructor<any>, M extends any[]>(base: T, ...mixins: M): T & Constructor<UnionToIntersection<FlatArray<M, 1>>>

• isSubclassOf<T, B>(ctor1: Constructor<T>, ctor2: Constructor<B>): boolean

• read<I extends AsyncIterable<any>>(iterable: I): I

• read(es: EventSource, options?: { event?: string; }): AsyncIterable<string>

• read<T extends Uint8Array | string>(ws: WebSocket): AsyncIterable<T>

• read<T>(target: EventTarget, eventMap?: { message?: string; error?: string; close?: string; }): AsyncIterable<T>

• read<T>(target: NodeJS.EventEmitter, eventMap?: { data?: string; error?: string; close?: string; }): AsyncIterable<T>

• run<T, A extends any[] = any[]>(script: string, args?: A, options?: { fn?: string; timeout?: number; adapter?: "worker_threads" | "child_process" }): Promise<{ workerId: number; abort(): Promise<void>; result(): Promise<T>; iterate(): AsyncIterable<T>; }>

See index.ts for details and docs.

Sub-packages

string

import { capitalize, chunk, /* ... */ } from "@ayonli/jsext/string";
// or
import "@ayonli/jsext/string/augment";

Functions

• compare(str1: string, str2: string): -1 | 0 | 1
• random(length: number): string
• count(str: string, sub: string): number
• capitalize(str: string, all?: boolean): string
• hyphenate(str: string): string
• words(str: string): string[]
• chunk(str: string, length: number): string[]
• truncate(str: string, length: number): string
• byteLength(str: string): number

Augmentation

• String
  • compare(str1: string, str2: string): -1 | 0 | 1
  • random(length: number): string
  • prototype
    • count(sub: string): number
    • capitalize(all?: boolean): string
    • hyphenate(): string
    • words(): string[]
    • chunk(length: number): string[]
    • truncate(length: number): string
    • byteLength(): number

number

import { isFloat, random } from "@ayonli/jsext/number";
// or
import "@ayonli/jsext/number/augment";

Functions

• isFloat(value: unknown): boolean
• isNumeric(value: unknown): boolean
• isBetween(value: number, [min, max]: [number, number]): boolean
• random(min: number, max: number): number
• sequence(min: number, max: number, step?: number, loop?: boolean): Generator<number, void, unknown>

When augmenting, these functions will be attached to the Number constructor.

array

import { count, split, /* ... */ } from "@ayonli/jsext/array";
// or
import "@ayonli/jsext/array/augment";

Functions

• count<T>(arr: RealArrayLike<T>, ele: T): number
• equals<T>(arr1: RealArrayLike<T>, arr2: RealArrayLike<T>): boolean
• split<T>(arr: RealArrayLike<T>, delimiter: T): RealArrayLike<T>[]
• chunk<T>(arr: RealArrayLike<T>, length: number): RealArrayLike<T>[]
• uniq<T>(arr: T[]): T[]
• shuffle<T>(arr: T[]): T[]
• orderBy<T>(arr: T[], key: keyof T, order: "asc" | "desc" = "asc"): T[]
• groupBy<T>(arr: T[], fn: (item: T, i: number) => string | symbol, type?: ObjectConstructor): Record<string | symbol, T[]>
• groupBy<T, K extends string>(arr: T[], fn: (item: T, i: number) => K, type: MapConstructor): Map<K, T[]>

Augmentation

• Array<T>
  • prototype
    • first(): T
    • last(): T
    • count(ele: T): number
    • equals(another: T[]): boolean
    • split(delimiter: T): T[][]
    • chunk(length: number): T[][]
    • uniq(): T[]
    • shuffle(): T[]
    • toShuffled(): T[]
    • toReversed(): T[]
    • toSorted(fn?: ((a: T, b: T) => number) | undefined): T[]
    • orderBy(key: keyof T, order?: "asc" | "desc"): T[]
    • groupBy(fn: (item: T, i: number) => string | symbol, type?: ObjectConstructor): Record<string | symbol, T[]>
    • groupBy<K>(fn: (item: T, i: number) => K, type: MapConstructor): Map<K, T[]>

uint8array

import { compare, split, /* ... */ } from "@ayonli/jsext/uint8array";
// or
import "@ayonli/jsext/uint8array/augment";

Functions

• compare(arr1: Uint8Array, arr2: Uint8Array): -1 | 0 | 1
• equals(arr1: Uint8Array, arr2: Uint8Array): boolean
• split<T extends Uint8Array>(arr: T, delimiter: number): T[]
• chunk<T extends Uint8Array>(arr: T, length: number): T[]

Augmentation

• Uint8Array
  • compare(arr1: Uint8Array, arr2: Uint8Array): -1 | 0 | 1
  • prototype
    • equals(another: Uint8Array): boolean
    • split(delimiter: number): this[]
    • chunk(length: number): this[]

object

import { hasOwn, path, /* ... */ } from "@ayonli/jsext/object";
// or
import "@ayonli/jsext/object/augment";

Functions

• hasOwn(obj: any, key: string | number | symbol): boolean
• hasOwnMethod(obj: any, method: string | symbol): boolean
• patch<T extends {}, U>(target: T, source: U): T & U
• patch<T extends {}, U, V>(target: T, source1: U, source2: V): T & U & V
• patch<T extends {}, U, V, W>(target: T, source1: U, source2: V, source3: W): T & U & V & W
• patch(target: object, ...sources: any[]): any
• pick<T extends object, U extends keyof T>(obj: T, keys: U[]): Pick<T, U>
• pick<T>(obj: T, keys: (string | symbol)[]): Partial<T>
• omit<T extends object, U extends keyof T>(obj: T, keys: U[]): Omit<T, U>
• omit<T>(obj: T, keys: (string | symbol)[]): Partial<T>
• as(obj: any, type: StringConstructor): string | null
• as(obj: any, type: NumberConstructor): number | null
• as(obj: any, type: BigIntConstructor): bigint | null
• as(obj: any, type: BooleanConstructor): boolean | null
• as(obj: any, type: SymbolConstructor): symbol | null
• as<T>(obj: any, type: Constructor<T>): T | null

When augmenting, these functions will be attached to the Object constructor.

math

import { sum, avg, product } from "@ayonli/jsext/math";
// or
import "@ayonli/jsext/math/augment";

Functions

• sum(...values: number[]): number
• avg(...values: number[]): number
• product(...values: number[]): number

When augmenting, these functions will be attached to the Math namespace.

promise

import { timeout, after, sleep, until } from "@ayonli/jsext/promise";
// or
import "@ayonli/jsext/promise/augment";

Functions

• timeout<T>(value: T | PromiseLike<T>, ms: number): Promise<T>
• after<T>(value: T | PromiseLike<T>, ms: number): Promise<T>
• sleep(ms: number): Promise<void>
• until(test: () => boolean | Promise<boolean>): Promise<void>

When augmenting, these functions will be attached to the Promise constructor.

collections

import BiMap from "@ayonli/jsext/collections/BiMap";
import CiMap from "@ayonli/jsext/collections/CiMap";
// or
import { BiMap, CiMap } from "@ayonli/jsext/collections";
// or
import "@ayonli/jsext/collections/augment";

Types

• BiMap<K, V> (extends Map<K, V>) Bi-directional map, keys and values are unique and map to each other.
  • prototype (additional)
    • getKey(value: V): K | undefined
    • hasValue(value: V): boolean
    • deleteValue(value: V): boolean
• CiMap<K extends string, V> (implements Map<K, V>) Case-insensitive map, keys are case-insensitive.

When augmenting, these types will be exposed to the global namespace.

error

import Exception from "@ayonli/jsext/error/Exception";
// or
import { Exception } from "@ayonli/jsext/error";
// or
import "@ayonli/jsext/error/augment";

Types

• Exception (extends Error)
  • cause?: unknown
  • code: number

When augmenting, these types will be exposed to the global namespace.

Functions

• toObject<T extends Error>(err: T): { [x: string | symbol]: any; }
• fromObject<T extends Error>(obj: { [x: string | symbol]: any; }): T

Augmentation

• Error
  • toObject<T extends Error>(err: T): { [x: string | symbol]: any; }
  • fromObject<T extends Error>(obj: { [x: string | symbol]: any; }): T
  • prototype
    • toJSON(): { [x: string | symbol]: any; }

Import all sub-package augmentation at once

import "@ayonli/jsext/augment";

When to use augmentations

If we’re developing libraries and share them openly on NPM, in order to prevent collision, it’s better not to use augmentations, but use the corresponding functions from the sub-packages instead.

But if we’re developing private projects, using augmentations can save a lot of time, it’s easier to read and write, and make sense.

Web Support

When using this package in the browser, there are three ways to import this package.

1. Import From node_modules

This is the same as above, but requires a module bundler such as webpack.

1. Import ES Module

<script type="module">
    import jsext from "https://deno.land/x/ayonli_jsext/esm/index.js";
    import "https://deno.land/x/ayonli_jsext/esm/augment.js";
    // or sub-packages
    import { isFloat, isNumeric } from "https://deno.land/x/ayonli_jsext/esm/number/index.js";
    import "https://deno.land/x/ayonli_jsext/esm/number/augment.js";
</script>

Note: the ES module can also be used in Deno.

1. Include Bundle

<script src="https://deno.land/x/ayonli_jsext/bundle/index.js"></script>
<script>
    const jsext = window["@ayonli/jsext"];
    // this will also include the augmentations
<script>