Modifying the version target of TypeScript code results in the TypeScript Compiler being unable to locate the module

After installing signalr via npm in Visual Studio 2019, I encountered an issue. When the target in my compiler options is set to ES6, I receive the error 

TS2307 (TS) Cannot find module '@microsoft/signalr.'
. However, when I change the target to ES5, the error disappears but I encounter a new exception in the browser: 
Uncaught ReferenceError: exports is not defined.

Below is my tsconfig configuration:


{
  "compilerOptions": {
    "target": "ES6",
    "sourceMap": true
  },
  "compileOnSave": true
}
typescriptvisual-studiotsc

Answer №1

When it comes to the module option, its default value is determined by the specified target, while the default value of the moduleResolution option depends on the chosen module. As per the insights from the documentation:

--module 

target === "ES3" or "ES5" ? "CommonJS" : "ES6"

--moduleResolution 

module === "AMD" or "System" or "ES6" ? "Classic" : "Node"

This discrepancy leads to a change in functionality. It's recommended to explicitly define these options. Here's a configuration that should suit your needs:

{
  "compilerOptions": {
    "target": "ES6",
    "sourceMap": true, 
    "module": "CommonJS", 
    "moduleResolution": "node"
  },

  "compileOnSave": true, 
}

Answer №2

By following the SignalR tutorial on the Microsoft website, you can easily set up Webpack for your project. Don't forget to adjust your tsconfig.json file as suggested by Titian Cernicova-Dragomir, setting "moduleResolution": "node".

{
    "compilerOptions": {
        "target": "es6",
        "moduleResolution": "node"
    }
}

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