Lambda函数导入GraphQL模块失败，如何正确导入queries和mutations？

错误信息 #

Cannot find module '/var/task/graphql/queries' imported from /var/task/index.js
Did you mean to import ../graphql/queries.js?

在Lambda函数的index.js中导入JS模块时出现上述错误，需要修正queries和mutations文件的导入方式，以下是相关文件代码：

现有文件代码 #

./index.js #

import { default as fetch, Request } from "node-fetch";
import * as queries from "./graphql/queries";
import * as mutations from "./graphql/mutations";

async function myFunction(event) {
    // My function body
}

const resolvers = {
    Mutation: {
        adminProvision: (event) => {
            return myFunction(event);
        },
    },
};

export const handler = async (event) => {
    //console.log(`EVENT: ${JSON.stringify(event)}`);
    const typeHandler = resolvers[event.typeName];
    if (typeHandler) {
        const resolver = typeHandler[event.fieldName];
        if (resolver) {
            var result = await resolver(event);
            console.log(result);
            return result;
        }
    }
    throw new Error("Resolver not found!");
};

./graphql/queries.js #

export const ListSmartLocks = /* GraphQL */ `
    query ListSmartLocks(
        $filter: ModelSmartLockFilterInput
        $limit: Int
        $nextToken: String
    ) {
        listSmartLocks(filter: $filter, limit: $limit, nextToken: $nextToken) {
            items {
                bikeparkID
            }
            nextToken
        }
    }
`;

./graphql/mutation.js #

export const createSmartLock = /* GraphQL */ `
    mutation CreateSmartLock(
        $input: CreateSmartLockInput!
        $condition: ModelSmartLockConditionInput
    ) {
        createSmartLock(input: $input, condition: $condition) {
            id
            deviceId
            status
            bikeparkID
            vehicleType
            createdAt
            updatedAt
        }
    }
`;

package.json #

{
  "name": "fnadminprovision",
  "type": "module",
  "version": "2.0.0",
  "description": "Lambda function generated by Amplify",
  "main": "index.js",
  "license": "Apache-2.0",
  "devDependencies": {
    "@types/aws-lambda": "^8.10.92"
  },
  "dependencies": {
    "node-fetch": "^3.2.10"
  }
}

修正方案 #

错误源于两个问题，对应修复如下：

1. 文件名拼写不匹配：实际mutation文件名为mutation.js，但导入时写的是mutations，需二选一修正：

   • 将./graphql/mutation.js重命名为mutations.js；
   • 或直接修改导入语句中的文件名。

2. ES模块需明确文件后缀：Node.js的ES模块（"type": "module"模式）要求导入本地文件必须添加.js后缀，Lambda环境严格执行此规则。

最终修正后的index.js导入语句示例（选其中一种即可）：

方案1：保留原文件名，修正导入语句

import { default as fetch, Request } from "node-fetch";
import * as queries from "./graphql/queries.js";
import * as mutations from "./graphql/mutation.js";

方案2：重命名mutation文件后修正导入语句
先把./graphql/mutation.js改名为mutations.js，再修改导入：

import { default as fetch, Request } from "node-fetch";
import * as queries from "./graphql/queries.js";
import * as mutations from "./graphql/mutations.js";

另外需确认Lambda部署包中包含graphql目录及对应文件，避免打包时遗漏。

内容的提问来源于stack exchange，提问作者Dhanuka Perera