src/fx.ts

// Copyright 2024 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import { ChildProcessWithoutNullStreams, spawn } from 'child_process';
import { DataStreamProcess } from './process';

export class Fx {
  constructor(public fuchsiaDir: string | undefined) {
  }

  public runStreaming(args: string[]): ChildProcessWithoutNullStreams | undefined {
    if (!this.fuchsiaDir) {
      return;
    }
    let env = { ...process.env };
    env['PATH'] = `${this.fuchsiaDir}/.jiri_root/bin:${env.PATH}`;
    const options = { detached: true, cwd: this.fuchsiaDir, env };
    return spawn('fx', args, options);
  }

  public runAsync(
    args: string[],
    onData: (data: Buffer) => void,
    onError: (data: Buffer) => void): DataStreamProcess | undefined {
    const process = this.runStreaming(args);
    if (!process) {
      return;
    }
    return new DataStreamProcess(process, onData, onError);
  }
}