AWS Lambda Node ES6 常见 JS 问题

Question

在使用无服务器的 AWS Lambda 中使用

nodejs18.x

运行时我遇到了 ES6 和 Common JS 的问题。

当不在

type: module

中设置

package.json

时，Lambda 会抱怨在

import

 之外使用 

module.export

语句

SyntaxError: Cannot use import statement outside a module

但是当我将

type

中的

module

设置为

package.json

时，它抱怨我正在使用

required

。我没有这样做，但是由 Serverless 创建的

s_tag_file.js

文件确实包含

required

{
    "errorType": "ReferenceError",
    "errorMessage": "require is not defined in ES module scope, you can use import instead\nThis file is being treated as an ES module because it has a '.js' file extension and '/var/task/package.json' contains \"type\": \"module\". To treat it as a CommonJS script, rename it to use the '.cjs' file extension.",
    "stack": [
        "ReferenceError: require is not defined in ES module scope, you can use import instead",
        "This file is being treated as an ES module because it has a '.js' file extension and '/var/task/package.json' contains \"type\": \"module\". To treat it as a CommonJS script, rename it to use the '.cjs' file extension.",
        "    at file:///var/task/s_tag_file.js:2:21",
        "    at ModuleJob.run (node:internal/modules/esm/module_job:194:25)"
    ]
}

我做错了什么？或者我可以做些什么不同的事情？

这是我的完整代码：

package.json

：

{
  "dependencies": {
    "@aws-sdk/client-s3": "^3.391.0",
    "aws-sdk": "^2.1437.0"
  },
  "type": "module"
}

serverless.yaml

：

org: OUR_ORG
app: OUR_APP
service: OUR_SERVICE

frameworkVersion: '3'


provider:
  name: aws
  runtime: nodejs18.x
  lambdaHashingVersion: 20201221
  region: us-east-1 # Required for using CloudFront, region does not matter though (it runs at the CF edge location anyways)
  iamRoleStatements:
  cloudFront:
    cachePolicies:
      cdnCachePolicy:
        MinTTL: 0
        MaxTTL: 5184001
        DefaultTTL: 5184000
        ParametersInCacheKeyAndForwardedToOrigin:
          CookiesConfig:
            CookieBehavior:
              none
          EnableAcceptEncodingBrotli: true
          EnableAcceptEncodingGzip: true
          HeadersConfig:
            HeaderBehavior: none
          QueryStringsConfig:
            QueryStringBehavior: none

custom:
  origin: 'ORIGIN_URL'
  path: 'build'

functions:
  tag-file:
    handler: index.tagFile
    events:
      - cloudFront:
          eventType: viewer-response
          origin:
            DomainName: ${self:custom.origin}
            OriginPath: /${self:custom.path}
            CustomOriginConfig:
              OriginProtocolPolicy: match-viewer
          cachePolicy:
            name: cdnCachePolicy

index.js

：

import { S3Client, PutObjectTaggingCommand } from "@aws-sdk/client-s3";

export async function tagFile(event, context, callback) {
  const response = event.Records[0].cf.response;

  const client = new S3Client({ region: "eu-west-1"});
  const input = {
    Bucket: "BUCKET_NAME",
    Key: event.Records[0].cf.request.uri,
    Tagging: {
      TagSet: [
        {
          Key: "requestTime",
          Value: Date.now().toString(),
        },
      ],
    },
  };
  const command = new PutObjectTaggingCommand(input);
  const S3response = await client.send(command);
  console.log(S3response);

  callback(null, response);
};

Answer 1

由于您在

org

文件中使用

serverless.yml

键（第 1 行），因此您正在使用无服务器仪表板插件。

此插件不支持 ES6（这是拥有

import

语句所必需的）。请参阅 https://github.com/serverless/dashboard-plugin/issues/564 了解更多详细信息。

根据网站说明，无服务器仪表板正在被贬值，取而代之的是支持 ES6 的无服务器控制台。

因此，如果您需要支持 ESM：

1. 停止使用 Serverless Dashboard（因为该插件已被弃用）
2. 用无服务器控制台替换无服务器仪表板