Runtime.ImportModuleError: Error: Cannot find module 'onCreateRadonData' - amazon-web-services

Question

I am trying to deploy a DynamoDB stream as a lambda function using AppSync and Serverless. The deployment goes well, without any error. But when I trigger the lambda creating a new instance in my DynamoDB table, it fails throwing this error:
{
"errorType": "Runtime.ImportModuleError",
"errorMessage": "Error: Cannot find module 'onCreateRadonData'\nRequire stack:\n- /var/runtime/UserFunction.js\n- /var/runtime/index.js",
"stack": [
"Runtime.ImportModuleError: Error: Cannot find module 'onCreateRadonData'",
"Require stack:",
"- /var/runtime/UserFunction.js",
"- /var/runtime/index.js",
" at _loadUserApp (/var/runtime/UserFunction.js:100:13)",
" at Object.module.exports.load (/var/runtime/UserFunction.js:140:17)",
" at Object.<anonymous> (/var/runtime/index.js:43:30)",
" at Module._compile (internal/modules/cjs/loader.js:999:30)",
" at Object.Module._extensions..js (internal/modules/cjs/loader.js:1027:10)",
" at Module.load (internal/modules/cjs/loader.js:863:32)",
" at Function.Module._load (internal/modules/cjs/loader.js:708:14)",
" at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:60:12)",
" at internal/main/run_main_module.js:17:47"
]
}
It is strange because, usually, I see this happens when importing some modules/dependencies in a bad way. But the function mentioned in the error onCreateRadonData is the name of the lambda itself, and in the deployment process, it is clearly shown that the deployment of the function went well, so I do not know what is going on...
The serverless.yaml file:
service: aws
plugins:
- serverless-appsync-plugin
- serverless-offline
provider:
name: aws
runtime: nodejs12.x
region: eu-west-1
iamRoleStatements:
- Effect: Allow
Action:
- dynamodb:Scan
- dynamodb:Query
- dynamodb:PutItem
Resource:
- !GetAtt RadonDataTable.Arn
- !Join [ '', [ !GetAtt RadonDataTable.Arn, '/*' ] ]
- Effect: Allow
Action:
- appsync:GraphQL
Resource:
- !GetAtt GraphQlApi.Arn
- !Join [ '/', [ !GetAtt GraphQlApi.Arn, 'types', 'Mutation', 'fields', 'createRadonData' ] ]
custom:
appSync:
name: ${self:service}
authenticationType: AWS_IAM
mappingTemplates:
- dataSource: RadonData
type: Query
field: listRadonData
request: Query.listRadonData.request.vtl
response: Query.listRadonData.response.vtl
- dataSource: None
type: Mutation
field: createRadonData
request: Mutation.createRadonData.request.vtl
response: Mutation.createRadonData.response.vtl
schema: src/schema.graphql
dataSources:
- type: NONE
name: None
- type: AMAZON_DYNAMODB
name: RadonData
description: 'DynamoDB Radon Data table'
config:
tableName: !Ref RadonDataTable
functions:
handleDynamoDbStream:
maximumRetryAttempts: 1
maximumRecordAgeInSeconds: 1
handler: src/handlers/onCreateRadonData.handler
environment:
APP_SYNC_API_URL: !GetAtt GraphQlApi.GraphQLUrl
events:
- stream:
type: dynamodb
arn: !GetAtt RadonDataTable.StreamArn
resources:
Resources:
RadonDataTable:
Type: AWS::DynamoDB::Table
Properties:
ProvisionedThroughput:
ReadCapacityUnits: 5
WriteCapacityUnits: 5
AttributeDefinitions:
- AttributeName: id
AttributeType: S
KeySchema:
- AttributeName: id
KeyType: HASH
StreamSpecification:
StreamViewType: NEW_IMAGE
And the lambda function onCreateRadonData.ts:
export const handler = (event) => {
console.log('Hello from lambda')
return;
}
NOTE: I've also tried the exports.handler = (event) ... way, but I throws the same error.
The code structure goes like this:
- src/handlers/onCreateRadonData.ts
- mapping-templates/files with mapping templates.vtl
- serverless.yml
- package.json
As You can see I have only one file named onCreateRadonData.ts inside the handlers folder in src. Thats all, the rest of the files are in the root directory.
Any ideas of what I am doing wrong? thank You all!

Answer 1

Okey guys I got it. Since I am using typescript I have to import the serverless-typescript plugin to convert all the ts files to js.