In-memory Node.js and browser job scheduler. 

In-memory Node.js and browser job scheduler

kibertoad

toad-scheduler

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    constructor(id: string, handler: () => Promise<void>, errorHandler?: (err: Error) => void);

    constructor(id: string, handler: () => Promise<unknown>, errorHandler?: (err: Error) => void);

  "description": "In-memory Node.js and browser job scheduler",

    "test": "jest --config=jest.config.json",

    "test:coverage": "jest --config=jest.config.json --coverage",

    "test:karma": "karma start --single-run --browsers ChromeHeadless karma.conf.js",

    "lint": "eslint \"lib/**/*.ts\" \"test/**/*.ts\"",

    "prettier": "prettier --write \"{lib,test}/**/*.{js,ts}\" index.ts",

    "format": "prettier --write \"{lib,test}/**/*.{js,ts}\" index.ts",

    "@typescript-eslint/eslint-plugin": "^5.45.1",

    "@typescript-eslint/parser": "^5.45.1",

    "@typescript-eslint/eslint-plugin": "^5.47.0",

    "@typescript-eslint/parser": "^5.47.0",

  "homepage": "https://github.com/kibertoad/toad-scheduler",

    "url": "git://github.com/kibertoad/toad-scheduler.git"

[![NPM Downloads][downloads-image]][downloads-url]

[![Build Status](https://github.com/kibertoad/toad-scheduler/workflows/ci/badge.svg)](https://github.com/kibertoad/toad-scheduler/actions)

[![Coverage Status](https://coveralls.io/repos/kibertoad/toad-scheduler/badge.svg?branch=main)](https://coveralls.io/r/kibertoad/toad-scheduler?branch=main)

In-memory TypeScript job scheduler that repeatedly executes given tasks within specified intervals of time (e. g. "each 20 seconds").

Node.js 12+ and modern browsers are supported

const { ToadScheduler, SimpleIntervalJob, Task } = require('toad-scheduler')

const task = new Task('simple task', () => { counter++ })

const job = new SimpleIntervalJob({ seconds: 20, }, task)

In order to avoid unhandled rejections, make sure to use AsyncTask if your task is asynchronous:

const { ToadScheduler, SimpleIntervalJob, AsyncTask } = require('toad-scheduler')

    () => { return db.pollForSomeData().then((result) => { /* continue the promise chain */ }) },

    (err: Error) => { /* handle error here */ }

Note that in order to avoid memory leaks, it is recommended to use promise chains instead of async/await inside task definition. See [talk on common Promise mistakes](https://www.youtube.com/watch?v=XV-u_Ow47s0) for more details.

Note that your error handlers can be asynchronous and return a promise. In such case an additional catch block will be attached to them, and should

there be an error while trying to resolve that promise, and logging error will be logged using the default error handler (`console.error`).

In case you want to prevent second instance of a task from being fired up while first one is still executing, you can use `preventOverrun` options:

import { ToadScheduler, SimpleIntervalJob, Task } from 'toad-scheduler';

const task = new Task('simple task', () => {

    // if this task runs long, second one won't be started until this one concludes

You can attach IDs to tasks to identify them later. This is helpful in projects that run a lot of tasks and especially if you want to target some of the tasks specifically (e. g. in order to stop or restart them, or to check their status).

		@@ -6,4 +6,4 @@ export declare class AsyncTask {
		private readonly errorHandler;
		constructor(id: string, handler: () => Promise<void>, errorHandler?: (err: Error) => void);
		constructor(id: string, handler: () => Promise<unknown>, errorHandler?: (err: Error) => void);
		execute(): void;
		}

		{
		"name": "toad-scheduler",
		"version": "2.1.0",
		"version": "2.1.1",
		"license": "MIT",
		@@ -20,3 +20,3 @@ "description": "In-memory Node.js and browser job scheduler",
		"lint": "eslint \"lib/*/.ts\" \"test/*/.ts\"",
		"prettier": "prettier --write \"{lib,test}/*/.{js,ts}\" index.ts",
		"format": "prettier --write \"{lib,test}/*/.{js,ts}\" index.ts",
		"prepublishOnly": "npm run build"
		@@ -26,6 +26,6 @@ },
		"@types/jest": "^28.1.8",
		"@types/node": "^18.11.11",
		"@typescript-eslint/eslint-plugin": "^5.45.1",
		"@typescript-eslint/parser": "^5.45.1",
		"eslint": "^8.25.0",
		"@types/node": "^18.11.17",
		"@typescript-eslint/eslint-plugin": "^5.47.0",
		"@typescript-eslint/parser": "^5.47.0",
		"eslint": "^8.30.0",
		"eslint-config-prettier": "^8.5.0",
		@@ -39,5 +39,5 @@ "eslint-plugin-prettier": "^4.2.1",
		"karma-typescript": "^5.5.3",
		"prettier": "^2.8.0",
		"prettier": "^2.8.1",
		"ts-jest": "^28.0.8",
		"typescript": "4.9.3"
		"typescript": "4.9.4"
		},
		@@ -44,0 +44,0 @@ "homepage": "https://github.com/kibertoad/toad-scheduler",

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