parseTsconfig should return path and config

[privatenumber]

Feature request

parseTsconfig is used when a path to a tsconfig.json file is already known. However, this path can be relative (e.g. use input from CLI).

When parseTsconfig read the config file, it should resolve it to the absolute path so it can be passed around with the config. This absolute path is necessary to resolve the rest of the config data (e.g. paths).

Motivations

Usage experience

Alternatives

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Additional context

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