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2.6 takes a very long time to --watch on large projects #19253
Description
TypeScript Version: 2.6.0-rc
Code
# Where tsconfig.json includes hundreds of .ts files (~400 on my smallest repro project)
tsc -w tsconfig.json{
"compilerOptions": {
"declaration": true,
"experimentalDecorators": true,
"jsx": "react",
"noImplicitAny": true,
"noImplicitReturns": true,
"noImplicitThis": true,
"noResolve": true,
"pretty": true,
"sourceMap": true,
"target": "es5"
},
"include": [...]
}
Expected behavior:
After adding an unused public method to a class, it should eventually finish compilation.
Actual behavior:
After >10 minutes of waiting a few times, I've terminated the process. I've also tried reinstalling 2.6.0-rc.
Side note: on a smaller project of 28 items, with identical tsconfig settings (except that strictNullChecks is on), recompilation from adding an unused public method to a class went from ~1000ms average over 5 runs to 1500ms average (measured from the time TS outputs the File_change_detected_Starting_incremental_compilation diagnostic to the time it outputs the Compilation_complete_Watching_for_file_changes diagnostic).
The code isn't open source so I can't post it here, but I have emailed a few TypeScript team members instructions on how to get to it before (Office Sway).
Activity
mhegazy commentedon Oct 17, 2017
Josh Ghoulberg 👻 (@JoshuaKGoldberg) can you share the project info with Sheetal Nandi (@sheetalkamat) and myself?
JoshuaKGoldberg commentedon Oct 17, 2017
Sure!
Also, sure enough, right after I posted this issue, two long-running watchers ended up in out-of-memory heap failures.
tolgaek commentedon Dec 22, 2017
I'm experiencing same error with v2.6.2. It only seems to happen after a file has changed
aldendaniels commentedon Jan 10, 2018
Also experiencing this issue. Added comment to related issue #19662
mhegazy commentedon Jan 10, 2018
Alden Daniels (@aldendaniels) please file a new issue and give us more information to help diagnose the issue. ideally a sample project.