I'm trying to convert my serverless nodejs graphql api to use typescript but serverless throws an error stating that the graphql handler is not a function.
Error message:
Error: Serverless-offline: handler for 'hello' is not a function
at Object.createHandler (/home/savnik/serverless-webpack-typescript-apollo/node_modules/serverless-offline/src/functionHelper.js:221:11)
at handler (/home/savnik/serverless-webpack-typescript-apollo/node_modules/serverless-offline/src/ApiGateway.js:485:40)
at module.exports.internals.Manager.execute (/home/savnik/serverless-webpack-typescript-apollo/node_modules/@hapi/hapi/lib/toolkit.js:41:33)
at Object.internals.handler (/home/savnik/serverless-webpack-typescript-apollo/node_modules/@hapi/hapi/lib/handler.js:46:48)
at exports.execute (/home/savnik/serverless-webpack-typescript-apollo/node_modules/@hapi/hapi/lib/handler.js:31:36)
at Request._lifecycle (/home/savnik/serverless-webpack-typescript-apollo/node_modules/@hapi/hapi/lib/request.js:312:68)
at processTicksAndRejections (internal/process/task_queues.js:93:5)
at Request._execute (/home/savnik/serverless-webpack-typescript-apollo/node_modules/@hapi/hapi/lib/request.js:221:9)
The objective is to create an apollo graphql api which uses typescript and can be used offline for development purpose.
I have reproduced the issue here: https://github.com/savnik/serverless-webpack-typescript-apollo
Any thoughts on what is the root cause for this issue?
This is because you are still using 'export' syntax for a js module.
In src/handler.ts, change the last line from exports.graphqlHandler = server.createHandler() to export const graphqlHandler = server.createHandler()