remove_declaration_deps.ts

import type { NodePath } from '@babel/traverse';

/**
 * Finds dependencies of a declaration and removes the ones that are used exclusively
 * by this declaration.
 *
 * NOTE: this only works for runtime bindings. Type bindings are excluded as I'd need to patch
 * Babel to keep track of type bindings in the context of a declaration, and ain't nobody got
 * time for that for now.
 *
 * @experimental
 */
export function removeDeclarationDeps(path: NodePath) {
    for (const binding of Object.values(path.scope.bindings)) {
        const pathsBelongingToDeclaration = binding.referencePaths.filter((referencePath) =>
            referencePath.findParent((parentPath) => parentPath === path),
        );

        if (binding.referencePaths.length === pathsBelongingToDeclaration.length) {
            binding.path.remove();
        }
    }
}