forkfeed(): void
Write data to the `writable` when data from the `readable` matches the regexp.
- readable* 
!stream.Readable!stream.Writable: A writable stream to pass answers to.
- inputs* !Array<!Array<(!RegExp \| string)>>: A serial collection of answers. Each answer will be ended with an EOL character (unless specified otherwise in the last argument). For example, pass `[[/question/, 'answer'], [/question2/, 'answer2]]`.
- log stream.Writable (optional): A stream to which to write both data from readable, and the passed answer. Default `null`.
- eol `string` (optional): The line feed to pass at the end of each answer. By default, _ForkFeed_ uses `os.EOL`, and when readline interface is used, there won't be `\r` in answers on Windows, but this can be useful for logging.
Sets up a listener on the _Readable_ stream and writes answers to the _Writable_ stream when data specified in `inputs` was detected. The logging stream will receive both data and answers.
Given a fork source code as
```js
const rl = require('readline')
const i = rl.createInterface({
input: process.stdin,
output: process.stderr,
})
i.question(
'What was the football coach yelling at the vending machine?\n> ',
() => {
i.question('What do snowmen do in their spare time?\n> ', () => {
process.exit(1)
})
})
```
The function can be used in the following manner:
```js
/* yarn example/ */
import forkFeed from 'forkfeed'
import { fork } from 'child_process'
(async () => {
const cp = fork('example/fork', [], { stdio: 'pipe' })
forkFeed(cp.stderr, cp.stdin, [
[/coach/, 'Gimme my quarter back!!!'],
[/snowmen/, 'Just chilling.'],
], process.stdout)
})()
```
```
What was the football coach yelling at the vending machine?
> Gimme my quarter back!!!
What do snowmen do in their spare time?
> Just chilling.
```
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