uploadFile.js

// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

function main(
  bucketName = 'my-bucket',
  filePath = './local/path/to/file.txt',
  destFileName = 'file.txt',
  generationMatchPrecondition = 0
) {
  // [START storage_upload_file]
  /**
   * TODO(developer): Uncomment the following lines before running the sample.
   */
  // The ID of your GCS bucket
  // const bucketName = 'your-unique-bucket-name';

  // The path to your file to upload
  // const filePath = 'path/to/your/file';

  // The new ID for your GCS file
  // const destFileName = 'your-new-file-name';

  // Imports the Google Cloud client library
  const {Storage} = require('@google-cloud/storage');

  // Creates a client
  const storage = new Storage();

  async function uploadFile() {
    const options = {
      destination: destFileName,
      // Optional:
      // Set a generation-match precondition to avoid potential race conditions
      // and data corruptions. The request to upload is aborted if the object's
      // generation number does not match your precondition. For a destination
      // object that does not yet exist, set the ifGenerationMatch precondition to 0
      // If the destination object already exists in your bucket, set instead a
      // generation-match precondition using its generation number.
      preconditionOpts: {ifGenerationMatch: generationMatchPrecondition},
    };

    await storage.bucket(bucketName).upload(filePath, options);
    console.log(`${filePath} uploaded to ${bucketName}`);
  }

  uploadFile().catch(console.error);
  // [END storage_upload_file]
}

main(...process.argv.slice(2));