This has a custom implementation instead of using "filepath.Dir/Base/Ext" because it should work the same on Unix and Windows.

This corresponds to a value of "false' in the "browser" package.json field.

This can be used to customize error messages for the current API kind.

It's not common for large files to have many warnings.

This is used to represent both file system paths (Namespace == "file") and abstract module paths (Namespace != "file").

This type is just so we can use Go's native sort function.

This type is just so we can use Go's native sort function.