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  • License MIT

Some util functions for personal use

Package Exports

  • @alttiri/util-js
  • @alttiri/util-js/index.js

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (@alttiri/util-js) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

util-js

Some JavaScript util functions.

Mostly it's a draft version for personal use.

*.d.ts

/** @deprecated */
export { formatSizeWinLike as bytesToSizeWinLike };
/**
 * Formats bytes mostly like Windows does,
 * but in some rare cases the result is different.
 * Check the file with tests.
 * @see format-size-win-like.test.js
 * @param {number} bytes
 * @return {string}
 */
export declare function formatSizeWinLike(bytes: number): string;
/**
 * @example
 * 10.1005859375 -> "10.1"
 * 9.99902343750 -> "9.99"
 * 836.966796875 -> "836"
 * 0.08   -> "0.08"
 * 0.099  -> "0.09"
 * 0.0099 -> "0"
 * @param {number} number
 * @return {string}
 */
export declare function toTruncPrecision3(number: number): string;
/** @deprecated */
export { formatNumber as tripleSizeGroups };
/**
 * Useful for file byte size formatting:
 * 34456909 -> 34 456 909
 * @param {number} num
 * @return {string}
 * */
export declare function formatNumber(num: number): string;
/**
 * "Sun, 10 Jan 2021 22:22:22 GMT" -> "2021.01.10"
 * @param {Date | string | number?} [dateValue]
 * @param {boolean} [utc = true]
 * @return {string}
 */
export declare function dateToDayDateString(dateValue?: Date | string | number, utc?: boolean): string;
/**
 * "Sun, 10 Jan 2021 22:22:22 GMT" -> "2021.01.10 22:22:22Z"
 * @param {Date | string | number} [dateValue]
 * @param {boolean?} [utc = true]
 * @return {string}
 */
export declare function dateToDayDateTimeString(dateValue?: Date | string | number, utc?: boolean): string;
/**
 * "Sun, 10 Jan 2021 22:22:22 GMT" -> "2021.01.10 22:22:22"
 * @param {Date | string | number} [dateValue]
 * @return {string}
 */
export declare function localDate(dateValue?: number | string | Date): string;
/**
 * "Sun, 10 Jan 2021 22:22:22 GMT" -> "2021.01.10"
 * @param {Date | string | number} [dateValue]
 * @return {string}
 */
export declare function localDateTime(dateValue?: number | string | Date): string;
/**
 * Formats date. Supports: YY.YYYY.MM.DD HH:mm:SS.
 * Default format: "YYYY.MM.DD".
 * formatDate() -> "2022.01.07"
 * @param {Date | string | number} [dateValue]
 * @param {string}  [pattern = "YYYY.MM.DD"]
 * @param {boolean} [utc = true]
 * @return {string}
 */
export declare function formatDate(dateValue?: Date | string | number, pattern?: string, utc?: boolean): string;
/** A classic `debounce` wrap function. */
export declare function debounce<A extends any[]>(runnable: (...args: A) => unknown, ms?: number, scope?: any): (...args: A) => void;
/** A classic `throttle` wrap function. */
export declare function throttle<A extends any[]>(runnable: (...args: A) => any, time?: number, scope?: any): (...args: A) => void;
/**
 * Allows to run a function as a `throttled` one, run it without a delay (`runNow`), or `clear` the deferred callback.
 *
 * @example
 * const {throttled, runNow, clear} = getThrottle(300, true);
 *
 * for (let i = 0; i < 100; i++) {
 *     throttled(() => {
 *         console.log(i);
 *     });
 *     await sleep(10);
 * }
 * runNow(); // run the last callback without delay
 */
export declare function getThrottle(ms?: number, runFirstImmediately?: boolean): {
    throttled: (callback: Function, runNow?: boolean) => void;
    runNow: (clearDelayed?: boolean) => any;
    clear: () => void;
};
/**
 * Sleeps `ms` milliseconds.
 * If param is `undefined` it sleeps until the next macro-task.
 * Note: With `0` real ms will be `4`+ ms.
 * @param {number?} ms
 * */
export declare function sleep(ms?: number): Promise<void>;
/**
 * Interruptible `sleep`.
 * If was interrupted resolves with the interrupt reason (`signal.reason`).
 * @param {number} ms
 * @param {AbortSignal} signal
 */
export declare function sleepEx(ms: number, signal: AbortSignal): Promise<void | any>;
export declare function isString(value: unknown): value is string;
export declare function isAnyString(value: unknown): value is (string | String);
/**
 * Java's `hashCode` like.
 * @example
 * hashString("Lorem Ipsum") === -488052133
 * hashString("Qwerty") === -1862984904
 * hashString("A") === 65
 * hashString("πŸ‘ΎπŸ‘½πŸ’€") === -2019372252
 * @param {string} str
 * @return {number}
 */
export declare function hashString(str: string): number;
export type DownloadBlobOpt = {
  /** The URL to be added as a hash in the downloaded blob URL. Useful to keep the original file URL. */
  url?: string;
  /** The delay before `revokeObjectURL`. 5000 by default. */
  timeout?: number;
};
export declare function downloadBlob(blob: Blob, name: string, url?: string): void;
export declare function downloadBlob(blob: Blob, name: string, opt: DownloadBlobOpt): void;

*.d.ts (sync)

/**
 * Use it when in one place you need to `enqueue()` some `value`, until `close()`.
 * In other place you can iterate over this queue in for-await loop.
 *
 * `enqueue` does not add a value until there is a free space in the queue, you should `await` it.
 * (`size` parameter of `constructor`).
 *
 * Use `close()` after you finished to `enqueue()` data.
 */
export declare class AsyncBufferQueue<T> {
    private values;
    private done;
    private promise;
    private resolve;
    private semaphore;
    constructor(size?: number);
    close(): void;
    enqueue(value: T): Promise<void>;
    [Symbol.asyncIterator](): AsyncGenerator<T>;
}
export declare class CountLatch {
    private count;
    private promise;
    private resolve;
    /** @param {number} count = 0 */
    constructor(count?: number);
    countDown(): void;
    countUp(): void;
    /** Makes this object "Thenable" */
    then(resolve: VoidFunc, reject: VoidFunc): Promise<void>;
}
export type Node<T> = {
    value: T;
    next: Node<T> | null;
};
/** "LinkedList" with `Array` interface */
export declare class Queue<T> {
    length: number;
    private _last;
    private _first;
    constructor();
    push(value: T): void;
    shift(): T | undefined;
}
/** The most simple semaphore implementation. */
export declare class Semaphore {
    private readonly max;
    private count;
    private readonly resolveQueue;
    /** @param {number} [max = 1] - by default, it works as a mutex. */
    constructor(max?: number);
    /** @return {Promise<unknown>} */
    acquire(): Promise<unknown>;
    /** @return {void} */
    release(): void;
}
/** `resolve`/`reject` of `Promise` with no result. */
export type VoidFunc = (value: void) => void;

Installation

From NPM

npm install @alttiri/util-js

From GitHub repository

npm install git+https://github.com/alttiri/util-js.git
More ways

From GitHub repository (a specific version):

  • Based on SemVer:

    npm install git+https://github.com/alttiri/util-js.git#semver:1.3.0

    Or add

    "@alttiri/util-js": "github:alttiri/util-js#semver:1.3.0"

    as dependencies in package.json file.

    See available tags.

  • Based on a commit hash:

    npm install git+https://github.com/alttiri/util-js.git#eea3068f8c70c6a500a44b69aeb0cb65ac8b80a6

    Or add

    "@alttiri/util-js": "github:alttiri/util-js#eea3068f8c70c6a500a44b69aeb0cb65ac8b80a6"

    as dependencies in package.json file.

    See available commits hashes.

From GitHub Packages:

To install you need first to create .npmrc file with @alttiri:registry=https://npm.pkg.github.com content:

echo @alttiri:registry=https://npm.pkg.github.com >> .npmrc

only then run

npm install @alttiri/util-node-js

Note, that GitHub Packages requires to have also ~/.npmrc file (.npmrc in your home dir) with //npm.pkg.github.com/:_authToken=TOKEN content, where TOKEN is a token with the read:packages permission, take it here https://github.com/settings/tokens/new.