fix: avoid modifying the AST.
fix: avoid modifying the AST.

Modifying the AST actually changes the behaviour
when type checking, as TS looks for files at the
modified location afterwards.
jteplitz602/ts2dart,dart-archive/ts2dart,alfonso-presa/ts2dart,caitp/ts2dart,yjbanov/ts2dart,jeffbcross/ts2dart,vicb/ts2dart,hterkelsen/ts2dart,hterkelsen/ts2dart,dart-archive/ts2dart,caitp/ts2dart,alfonso-presa/ts2dart,hansl/ts2dart,jacob314/ts2dart,hansl/ts2dart,vicb/ts2dart,jacob314/ts2dart,dart-archive/ts2dart,jeffbcross/ts2dart,jteplitz602/ts2dart,yjbanov/ts2dart