Error: Typescript interface with immutable properties (Error: 'readonly' is not recognized)

I am encountering an error: "Cannot find name 'readonly'" while trying to define an interface with readonly properties. I have Typescript version 2.0.8 installed and I am working on Visual Studio 2015.

Below is a snippet of the code:

TypeScript

interface Car {
    readonly engine: string;
    readonly model: string;
}

If you have any suggestions or solutions, please feel free to share them. Your help is greatly appreciated.

Answer №1

To troubleshoot this issue, it's important to pinpoint where the error is originating from. Is it happening within Visual Studio, such as with intellisense or during project builds? Or is it related to compilation using node (maybe webpack) and referencing package.json where version 2.0.8 is specified?

Considering that Visual Studio typically does not use version 2.0.8, it's likely that the error is related to the TypeScript version in Visual Studio. In this case, updating TypeScript for Visual Studio may resolve the problem.

Unfortunately, updating directly from the extensions view might not work as expected. You may need to manually download and install the update from this link: https://www.microsoft.com/en-us/download/details.aspx?id=48593

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