@nrwl/workspace/src/utils/rules/workspace.d.ts

import { Rule } from '@angular-devkit/schematics';
/**
 * Sets the default collection to the provided collection name
 * The collection name is only set in case the current defaultCollection is undefined or set to '@nrwl/workspace'
 * @param collectionName Name of the collection to be set as defaultCollection
 */
export declare function setDefaultCollection(collectionName: string): Rule;