How to use the @embroider/core.packageName function in @embroider/core

let seenSpecifiers = new Set();

    let dependencies: Map = new Map();
    for (let dep of this.pkg.dependencies) {
      dependencies.set(dep.name, dep);
    }

    for (let imp of imports) {
      // handle each specifier only once
      if (seenSpecifiers.has(imp.specifier)) {
        continue;
      }
      seenSpecifiers.add(imp.specifier);

      let name = absolutePackageName(imp.specifier);
      if (!name) {
        // must have been relative, we only care about absolute imports here
        continue;
      }

      if (name === this.pkg.name) {
        // Our own name is allowed in the appJS (because that is going to get
        // moved into the app, where our name will be resolvable). It would be
        // a problem in our Own JS, but that gets patched up by our
        // babel-plugin.
        continue;
      }

      let dep = dependencies.get(name);
      if (dep && (dep.isEmberPackage || dependencies.has('ember-auto-import'))) {
        // this is a valid inter-package specifier, either because it's an ember