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Very high memory usage #10759

@mvestergaard

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@mvestergaard

I've been having issues with the typescript compiler eating up lots of memory.

A run of tsc in my current project reaches around 1.1-1.2GB memory before completion.

This has been causing issues when using awesome-typescript-loader through webpack. It actually crashes after a little while because it exceeds a memory limit (1.5GB i believe)
This seems to be caused in part by a memory leak in ATL, but the memory use of tsc on its own is bordering on extreme.
I have an issue open on that project as well s-panferov/awesome-typescript-loader#227

I would suspect however, that with a project large enough, tsc could exceed the memory limit on its own.

I can provide an example project if needed.

Node: 6.5.0
TS: 2.0.2

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