unpipe.js
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'use strict'
const stream = require('stream')
const check = require('check-types')
const parse = require('./parse')
module.exports = unpipe
/**
* Public function `unpipe`.
*
* Returns a writeable stream that can be passed to stream.pipe, then parses JSON
* data read from the stream. If there are no errors, the callback is invoked with
* the result as the second argument. If errors occur, the first error is passed to
* the callback as the first argument.
*
* @param callback: Function that will be called after parsing is complete.
*
* @option reviver: Transformation function, invoked depth-first.
*
* @option discard: The number of characters to process before discarding them
* to save memory. The default value is `1048576`.
*
* @option yieldRate: The number of data items to process per timeslice,
* default is 16384.
**/
function unpipe (callback, options) {
check.assert.function(callback, 'Invalid callback argument')
const jsonstream = new stream.PassThrough()
parse(jsonstream, Object.assign({}, options, { ndjson: false }))
.then(data => callback(null, data))
.catch(error => callback(error))
return jsonstream
}