[rigor789]

Draft until ios-device-lib is released. CI can't compile this against 0.9.6, because the types for the new stream are missing. After NativeScript/ios-device-lib#88 ships, bump the dependency here and mark this ready.

What is the current behavior?

App logs on devices come from syslog_relay, filtered with fragile regexes. Kernel noise such as wlan0: lines gets through, non-ASCII text is escaped, and there is no way to choose how much native output to show. Long messages are truncated by os_log with <…>.

What is the new behavior?

• Devices stream os_trace_relay and simulators use log stream --style ndjson, both selected by executable name, so logs survive closing and reopening the app with no pid tracking.
• --log sets the scope:
  • default: JS output
  • debug: the whole app process without debug entries, like Xcode
  • trace / all: everything
• Debug builds write logChunkMarkers to the app's package.json, and the CLI stitches split messages back together per process and thread. Webpack doesn't touch that file and the key only re-signs, so build caching isn't affected.
• Devices fall back to the syslog relay, with markers removed, if the stream isn't available.
• The unused lib/common/mobile/ios/ios-log-filter.ts is deleted.

print() and stderr capture follow in #6181.

Testing

Demo app, 11 messages (up to 100 KB, emoji, 800 lines, console.error, objects) compared exactly against the expected text, on both launches of each run. The full four-PR stack with the runtime PRs:

Setup	Simulator (iOS 26.2)	iPad (iPadOS 26.7)
Default	11/11	11/11
--log debug and --log trace, before stacking	11/11	11/11
This CLI with stock runtime 9.1.0, before stacking	no markers, long messages still truncated as today	not run

• Release prepare leaves the key out and debug prepare includes it.
• Trailing whitespace at the end of a message is trimmed, as it already was.
• The syslog fallback has only been tested on captured logs, not in a live app.
• --log trace is large: about 11,000–13,000 extra lines per run of the demo app.
• See feat(console): split long messages for os_log and report errors as errors ios#530 for the known limit on chunk loss under extreme bursts.

Part of a stack

Base: #6178. Needs NativeScript/ios-device-lib#88 released, and NativeScript/ios#530 for stitching.

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