javascript - 在 Firebase 云函数中包含异步函数 (eslint "Parsing error: Unexpected token function")

Question

问题

如何将 async 辅助方法添加到 Cloud Functions index.js 文件中？在将 fs.writefile 转换为 Promise 时，需要一个 async 函数才能使用 await ，如本文所述StackOverflow 帖子:fs.writeFile in a promise, asynchronous-synchronous stuff .但是，lint 不赞成在 exports 函数之外向 index.js 文件添加额外的方法。

错误

第 84 行引用辅助函数 async function writeFile。

Users/adamhurwitz/coinverse/coinverse-cloud-functions/functions/index.js 84:7 error Parsing error: Unexpected token function

✖ 1 problem (1 error, 0 warnings)

npm ERR! code ELIFECYCLE

npm ERR! errno 1

npm ERR! functions@ lint: eslint .

npm ERR! Exit status 1

npm ERR!

npm ERR! Failed at the functions@ lint script.

npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:

npm ERR! /Users/adamhurwitz/.npm/_logs/2018-12-12T01_47_50_684Z-debug.log

Error: functions predeploy error: Command terminated with non-zero exit code1

设置

index.js

const path = require('path');
const os = require('os');
const fs = require('fs');
const fsPromises = require('fs').promises;
const util = require('util');
const admin = require('firebase-admin');
const functions = require('firebase-functions');
const {Storage} = require('@google-cloud/storage');
const textToSpeech = require('@google-cloud/text-to-speech');

const storage = new Storage({
  projectId: 'project-id',
});
const client = new textToSpeech.TextToSpeechClient();

admin.initializeApp();

exports.getAudiocast = functions.https.onCall((data, context) => {
  const bucket = storage.bucket('gs://[bucket-name].appspot.com');
  var fileName;
  var tempFile;
  var filePath;

  return client.synthesizeSpeech({
    input: {text: data.text },
    voice: {languageCode: 'en-US', ssmlGender: 'NEUTRAL'},
    audioConfig: {audioEncoding: 'MP3'},
  })
  .then(responses => {
    var response = responses[0]; 
    fileName = data.id + '.mp3'
    tempFile = path.join(os.tmpdir(), fileName);  
    return writeFile(tempFile, response.audioContent)
  })
  .catch(err => {
    console.error("Synthesize Speech Error: " + err);
  })
  .then(() => {
     filePath = "filePath/" + fileName;
     return bucket.upload(tempFile, { destination: filePath })
  })
  .catch(err => {
     console.error("Write Temporary Audio File Error: " + err);
  })
  .then(() => {
   return { filePath: filePath }
  })
  .catch(err => {
     console.error('Upload Audio to GCS ERROR: ' + err);
  });
});

辅助方法:

async function writeFile(tempFile, audioContent) {
    await fs.writeFile(tempFile, audioContent, 'binary');
}

尝试的解决方案

按照博文 Cloud Functions for Firebase Async Await style 中的建议启用 Node.js 8 .

1. Set Node.js version “引擎”:{“Node ”:“8”}

2. return await fs.writeFile(tempFile, audioContent, 'binary');

Lint 不喜欢这种解决方案。

Answer 1

我尝试了以上所有对我不起作用的解决方案。这是由于我的 package.json 语法错误:

"scripts": {
    "lint": "eslint ."
  },

改为:

"scripts": {
    "lint": "eslint"
  },

正如 Burak 在评论中所说，这个点是在我们创建 firebase 函数时默认放置的