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Also made several project on https://oshpark.com/ and https://easyeda.com/ - adapters for 0.1" for breadboard or templates for own projects...
Sell board with 0.05" connectors for soldering to module and board with already soldered connectors..
But yes, i also think that 0.1" pre-soldered breadboard compatible packs will be most popular just like NodeMCU, Weemos D1 or Lolin and etc. board...

Same functionality + external antenna for less money...

Look at http://www.cdebyte.com/en/product-view-news.aspx?id=243

What will be cheaper - two different board (small and big) or small board soldered on big board?

For example, there are many very cheap ESP8266 modules soldered on top of adapter board.
In big quantities there will be no significant difference.

Try to order boards from https://item.taobao.com/item.htm?spm=a312a.7700824.w4023-16080569721.11.6e5efbbasB39iB&id=532630623264
They almost like MDBT42 ut may be cheaper.

OK. All works well. On bare NRF52832 board with espruino_1v94_nrf52832.hex RX must be high at boot.

You can add PCB adapter board with various pin arrangements.

No :) I'm not about Pin definitions. I'm about high level on RX for UART enabling.

For NRF52832DK there is no note in NRF52832DK.py.
Can you suggest where to look in sources for UART initialization in such way?

Is it same for NRF52832DK?

And there is error somewhere:
from site:
When power is first applied, Puck.js checks if pin D28 is at 3.3v (which will be the case if it is connected to a Serial port's transmit line)
forom PUCKJS.py

'D29' : "If pulled up to 1 on startup, D28 and D29 become Serial1",

Hello!
I'm able to flash Espruino to this http://www.infor-link.com NRF52832. Board very simular to MDBT42Q from Puck.js - just chip and several passive components on pcb.
I try espruino_1v94_nrf52832.hex and espruino_1v94_puckjs.hex from resent travis build.
BLE part working - nRF Connect able to connect to board.

But i'm unable to connect to board using UART - no any output at 9600 or any other speed.
Do i need any external components like pull-up resistors or anything else?