Allow defining typescript project with -p parameter to define a different tsconfig.ts file. p.eg: package-build -p tsconfig.build.json. This is useful to have a tsconfig.json in the root to allow IDE and library implementation to get a project file including files even if they won't be included in the NPM package (.spec, .test, .stories). Otherwise, a project including these files will transform every file defined, even those not desired in the final bundle, not only forcing to exclude them explicitly but increasing compilation times and errors. By default tsconfig.json will be used as it usually does.

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