Module specifier 

Relative import specifiers, and what moving a file does to them.

Only specifiers that denote a file take part. ./core.js and ../lib/y are paths; Rust’s crate::core and Java’s com.example.Core are module names that a file move does not rewrite, and treating them as paths would corrupt them. So everything here is gated on the specifier starting with ./ or ../.

The arithmetic is done on normalised segments rather than by string surgery, because .. that escapes the repository root and . segments in the middle both produce specifiers that look plausible and resolve somewhere else.

Functions

between

The specifier an importer in importer needs to reach target, preserving any extension style the original used.

is_relative

Whether a specifier names a file rather than a module.

resolve

Resolves a relative specifier against the directory of the importing file.

rewrite

The specifier for target as written from a file that has moved to moved_to.