@rxdi/schematics/utils/path.solver.ts

import { basename, dirname, Path, relative } from '@angular-devkit/core';

export class PathSolver {
  constructor() {}

  public relative(from: Path, to: Path): string {
    const placeholder = '/placeholder';
    const relativeDir = relative(
      dirname((placeholder + from) as Path),
      dirname((placeholder + to) as Path),
    );
    return (relativeDir.startsWith('.')
      ? relativeDir
      : './' + relativeDir
    ).concat(relativeDir.length === 0 ? basename(to) : '/' + basename(to));
  }
}