pretty-ts-imports (a.k.a. primp)

You can easily import the ImportSorter, ImportSeparator and ImportIntegrator, as well as the FileManager to load in your typescript files and work with them in your code.

// maybe something like this
import {
  FileManager,
  ImportSorter,
  ImportIntegrator
} from "pretty-ts-imports";

let fileManager = new FileManager(yourTSConfigPath, someOfYourFiles);
let sorter = new ImportSorter(yourGeneratedRules, []);
let integrator = new ImportIntegrator({});
for (let imported of fileManager.imports.values()) {
  let integrated = integrator.integrate(imported.imports);
  // write your integrated content somewhere
}

If you create custom functions for your primp config, you may use the function interfaces ImportCompareFunction, ImportElementCompareFunction and SeparateByFunction. They help you make sure you are designing a correct comparator function.

For examples check this. Especially the example compare function.