TODO must require explicit rootDir; do not allow to be inferred. TODO resolve JSON if resolveJsonModules??

Test a bunch of permutations of:

config permutations:

• allowJs

• not allowJs

• preferSrc

• not preferSrc

import permutations:

• Relative import of file

• Relative import of index

• rootless library import of main

• rootless library import of index

• rootless library import of exports sub-path

• rootless self-import of main

• rootless self-import of index

• rootless self-import of exports sub-path

  • Require with extension

  • Require without extension

  • Require from dist to dist

  • Require from dist to src

  • Require from src to dist

  • Require from src to src

lib permutations:

• module exists in both src and dist (precompilation ran)

• module exists in only dist (came from elsewhere)

• module exists only in src (did not precompile)

• .ts / .js extension

• .tsx / .js extension

• .cts / .cjs extension

• .mts / .mjs extension

• .js / .js extension

• .jsx / .js extension

• .cjs / .cjs extension

• .mjs / .mjs extension