Asynchronous Engine

json-logic-engine comes with built-in support for asynchronous operations, so that you may integrate with external data sources our modules that may only resolve via Promises.

import { AsyncLogicEngine } from 'json-logic-engine'


const engine = new AsyncLogicEngine()


engine.addMethod('after250ms', async (n) => {
    return new Promise(resolve => {
        setTimeout(() => {
            resolve(n)
        }, 250)
    })
})


async function main () {
    const f = await engine.build({ '+': [{ after250ms: 1 }, 1] })
    console.log(await f()) // prints 2
}
At the time of writing, there are no built-in asynchronous operations, although each of the higher order operators are built-with support for asynchronous operations. (so you can map/filter/reduce/etc using async methods.)