Use caches for module resolution and type reference directives when using compiler default functions

[johnnyreilly]

Hey @piotr-oles

I just wanted to give you a heads up as to this feature being added by @sheetalkamat to ts-loader:

TypeStrong/ts-loader#1287

Is it possible that some of this could be useful for fork-ts-checker-webpack-plugin?

[piotr-oles]

Hmmm... If I understand correctly, the compiler host created by ts.createCompilerHost() or ts.createWatchCompilerHost() has built-in cache for resolveModuleNames() and resolveTypeReferenceDirectives() but if you overwrite these methods, you will lost the cache mechanism. If that's the case, it will not improve the performance of this plugin, because we don't overwrite these methods :)

[johnnyreilly]

Ah well - good to check though!