@mybug/wait v0.1.4

@mybug/wait

await anything synchronously.

Useful when you want to get the result of async operation inside a synchronous function, while rewriting the synchronous function to be an async one is not possible. (Maybe it's in 3rd party library, or a predefined callback like event handler, etc)

deprecated

Ownership of this package has been transferred, please use @superjs/wait(https://www.npmjs .com/package/@superjs/wait)

usage

wait(awaitable)

awaitable: a value can be awaited

return the promiseValue of awaitable just like using await, but synchronously.

example

const wait = require('@mybug/wait')
const su = require('superagent')
let resp = wait(su('https://api.npms.io/v2/search?q=scope:mybug')) //async http request 
console.log(resp.body) // result is printed synchronously

use together with @mybug/awaitor

wait can resolve an operation which returns a promise, but not an operation which needs a callback.

you can either: 1. wrap the operation to return a promise 2. just call the operation, using @mybug/awaitor as callback, like below

const awaitor = require('@mybug/awaitor')
const wait = require('@mybug/wait')

let cb = awaitor()
foo(1,2,cb) // whenever a callback is needed, just use cb
let result = wait(cb) //result is an array, containing the args cb received
console.log(result) // [3]

function foo(a,b,cb){
  setTimeout(()=>cb(a+b),1000)
}

also useful as debug tool

When being paused on a breakpoint, you can evaluate expressions but no async operations can be evaluated immediately.

Using @mybug/wait, you can evaluate an async operation, get the result of it, while still being paused on the breakpoint.

Just evaluate wait(anyAsyncOperation()), you will see the async operation gets done and returned.

You don't even have to require @mybug/wait in your code. Just install @mybug/wait as a devDependency. When debugging, evaluate global.wait=process.mainModule.require('@mybug/wait'). That's all.