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Why
A message box / dialog API would be generally useful any time we want to show or surface a native dialog to prompt the user from the web side. A concrete example of where this would be useful is if we want to replicate the behavior on web where we confirm if the user wants to leave the Repl (in the
beforeunload
handler) if the fs is still dirty. See this PR for context: #58Fixes WS-677
What changed
Add showMessageBox API
Test plan
Tested on web in a local branch