Compiler OOM on strict generic checks

[mhegazy]

Reported in #18411 (comment)

Project: https://github.com/electricessence/TypeScript.NET

The project compiles in Webstorm for the existing tsconfigs with 2.7. But I'm dependent on gulp to render my distributions and run tests. The area where it gets problematic is in /source/System.Linq where the Linq.ts lib tries to reconcile the extensive interface signature. If I rip out the guts of the interface, it will compile (although still quite slowly relative to 2.3.2)

Note: --noStrictGenericChecks seems to avoid the crash.

[electricessence]

Unless gulp-typescript changed something where passing noStrictGenericChecks: true to the options doesn't work, then I'm still getting the error.

[email protected]
Compilation is taking quite a long time before failing.

Just for reference, here is where the options block is passed through my build process:
https://github.com/electricessence/gulp-typescript-helper/blob/master/source/BuildHelper.ts#L59
I see no reason why it wouldn't be working though since it's been reliable through 2.3.2.

I may have to just wait for a fix.

[electricessence]

Ok so this officially has be come a serious issue. (related #20251)

TS 2.6.0 will allow me to add:

readonly [Symbol.toStringTag]: "Promise";

But TS 2.3.2 will not. And 2.3.2 is the latest version that will compile my code successfully.
Apparently TS 2.3.2 does not understand Symbol. Or more correctly, it can't be made to understand .toStringTag.
If I try to hack either version make both happy, they disagree.

[aldendaniels]

Process is running out out of memory on TS 2.6.2 when running

tsc --noemit --watch --project .

I also tried

tsc --noemit --watch --noStrictGenerics --project .

As recommended in #18411, but no dice.

Non-watch mode and the IDE interface are OK.

[mhegazy]

@aldendaniels can you share your project

[mhegazy]

Closing for now. please reopen if a sample exists.

[electricessence]

This is how I ended up fixing my problems:
#21048

@sandersn helped me through and also had me mark a checkin where it's repoable.