isomorphic-timers-promises

`timers/promises` for client and server.

Usage no npm install needed!

<script type="module">
  import isomorphicTimersPromises from 'https://cdn.skypack.dev/isomorphic-timers-promises';
</script>

README

isomorphic-timers-promises

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timers/promises for client and server.

The timers/promises API provides an alternative set of timer functions that return Promise objects.

Install

npm install isomorphic-timers-promises --save

Usage

import {
    setTimeout,
    setImmediate,
    setInterval
} from 'isomorphic-timers-promises';

(async () => {
    const result = await setTimeout(100, 'becky');
    console.log(result); // 'becky'
})();

(async () => {
    const result = await setImmediate('maya');
    console.log(result); // 'maya'
})();

(async () => {
    let result = 0;
    for await (const startTime of setInterval(100, Date.now())) {
        const now = Date.now();
        result = result + 1;
        if (now - startTime >= 1000) {
            break;
        }
    }
    console.log(result); // 10
})();

Usage with Webpack

Show me 
// webpack.config.js
module.exports = {
    // ...
    resolve: {
        alias: {
            'timers/promises': 'isomorphic-timers-promises'
        }
    }
};

Usage with Rollup

Show me 
// rollup.config.js
const { default: resolve } = require('@rollup/plugin-node-resolve');
const alias = require('@rollup/plugin-alias');

module.exports = {
    // ...
    plugins: [
        resolve(),
        alias({
            entries: {
                'timers/promises': 'isomorphic-timers-promises'
            }
        })
    ]
};

API

setTimeout([delay[, value[, options]]])

Returns: Promise

Property Type Default Description
delay number 1 The number of milliseconds to wait before fulfilling the promise.
value * A value with which the promise is fulfilled.
options.ref boolean true Set to false to indicate that the scheduled timeout should not require the event loop to remain active. Valid only for server environment.
options.signal AbortSignal An optional AbortSignal that can be used to cancel the scheduled timeout.

setImmediate([value[, options]])

Returns: Promise

Property Type Default Description
value * A value with which the promise is fulfilled.
options.ref boolean true Set to false to indicate that the scheduled immediate should not require the event loop to remain active. Valid only for server environment.
options.signal AbortSignal An optional AbortSignal that can be used to cancel the scheduled immediate.

setInterval([delay[, value[, options]]])

Returns: async iterator that generates values in an interval of delay.

Property Type Default Description
delay number 1 The number of milliseconds to wait between iterations.
value * A value with which the iterator returns.
options.ref boolean true Set to false to indicate that the scheduled timeout between iterations should not require the event loop to remain active. Valid only for server environment.
options.signal AbortSignal An optional AbortSignal that can be used to cancel the scheduled timeout between operations.

Node and browser support

Supports Node 10+.

Tested in Chrome 72, Firefox 65, Internet Explorer 11 and should work in all modern browsers.

Check support based on Browserslist configuration).

Assumes Promise, AbortController and setImmediate are polyfilled or available in global context.

Test

For automated tests, run npm run test:automated (append :watch for watcher support).

Test suite is taken and modified from official Node.js repository (setTimeout, setImmediate, setInterval).

License

MIT © Ivan Nikolić