Error in Typescript: The module '@azure/functions' does not have an exported member named 'app'

Let's dive into a TypeScript and Azure integration question:

Within my Node.js code for an Azure function:

import {
  app,
  HttpRequest,
  HttpResponseInit,
  InvocationContext,
} from "@azure/functions";
import { workerExec } from "./worker";

export async function myappfunction1(
  request: HttpRequest,
  context: InvocationContext
): Promise<HttpResponseInit> {
  context.log(`Http function processed request for url "${request.url}"`);
  try {
    console.log(`Incoming event: ${JSON.stringify(event)}`);
    const result = await workerExec(event, context);
    console.log("Successfully processed event;");
    return result;
  } catch (err) {
    console.log(err);
    throw err;
  }
}

app.http("myappfunction1", {
  methods: ["GET", "POST"],
  authLevel: "anonymous",
  handler: myappfunction1,
});


Encountering this error while using the tsc command:

error TS2305: Module '"@azure/functions"' has no exported member 'app'.
error TS2724: '"@azure/functions"' has no exported member named 'HttpResponseInit'. 
error TS2305: Module '"@azure/functions"' has no exported member 'InvocationContext'

Configuration in my tsconfig.json is as follows:

{
  "compilerOptions": {
    "target": "es2020",
    "strict": true,
    "preserveConstEnums": true,
    "noEmit": true,
    "sourceMap": false,
    "module": "es2015",
    "moduleResolution": "node",
    "esModuleInterop": true,
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true,
    "baseUrl": "src/functions",
    "paths": {
      "*": [
        "*",
        "node_modules/*"
      ]
    },
  },
  "exclude": [
    "node_modules",
    "**/*.test.ts"
  ],
  "include": [
    "**/*"
  ]
}

What seems to be causing the issue?

Answer №1

The issue was resolved after executing the following command:

npm install @azure/functions@preview

Answer №2

I was able to replicate the issue in my setup and achieve the desired outcome.

To create a function in v4 model using TypeScript, I followed the guidelines provided by Microsoft documentation.

Initially, when setting up the function, I encountered an error as well.

This was the folder structure:

After running the command `npm run build`, it generated a directory named dist with the compiled JavaScript file corresponding to the functions. This is because the tsconfig configuration had the outDir set to

"outDir" : "dist"
.

In your scenario, the outDir might be missing from your tsconfig file.

Following that adjustment, everything worked smoothly for me.

Code snippet:

import { app, HttpRequest, HttpResponseInit, InvocationContext } from  "@azure/functions";

export  async  function  myappfunction1(request:  HttpRequest, context:  InvocationContext):  Promise<HttpResponseInit> {
context.log(`Http function processed request for url "${request.url}"`);
const  name  =  request.query.get('name') ||  await  request.text() ||  'world';
return { body:  `Hello, ${name}!` };
};

app.http('myappfunction1', {
methods: ['GET', 'POST'],
authLevel:  'anonymous',
handler:  myappfunction1
});

local.setting.json:

{
"IsEncrypted": false,
"Values": {
"AzureWebJobsStorage": "",
"FUNCTIONS_WORKER_RUNTIME": "node",
"AzureWebJobsFeatureFlags": "EnableWorkerIndexing"
}
}

tsconfig.json:

{
"compilerOptions": {
"module": "commonjs",
"target": "es6",
"outDir": "dist",
"rootDir": ".",
"sourceMap": true,
"strict": false
}
}

Output:

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