vercel/examples/aurelia/aurelia_project/generators/task.js

import { inject } from 'aurelia-dependency-injection';
import { Project, ProjectItem, CLIOptions, UI } from 'aurelia-cli';

@inject(Project, CLIOptions, UI)
export default class TaskGenerator {
  constructor(project, options, ui) {
    this.project = project;
    this.options = options;
    this.ui = ui;
  }

  async execute() {
    const name = await this.ui.ensureAnswer(
      this.options.args[0],
      'What would you like to call the task?'
    );

    let fileName = this.project.makeFileName(name);
    let functionName = this.project.makeFunctionName(name);

    this.project.tasks.add(
      ProjectItem.text(`${fileName}.js`, this.generateSource(functionName))
    );

    await this.project.commitChanges();
    await this.ui.log(`Created ${fileName}.`);
  }

  generateSource(functionName) {
    return `import gulp from 'gulp';
import project from '../aurelia.json';

export default function ${functionName}() {
  return gulp.src(project.paths.???)
    .pipe(gulp.dest(project.paths.output));
}
`;
  }
}