Top solution for resolving TypeScript error - property not found on type

Encountering an issue when defining a custom property on an array or object in typescript, leading to the error message:

"Property x does not exist on type Object (or type Array)"

For instance, working with typescript in Angular and having a defined scope based on Angular's type definition file:

scope:ng.IScope

Attempting to add a new property to scope like so:

scope.anotherProperty = "string";

This results in the aforementioned error. Solutions include using:

scope["anotherProperty"] = "string";

OR

(<any>scope).anotherProperty = "string;

Similarly, encountering challenges within a d3 graph setup:

function panZoomNode (node:any) {
            for (var i = 0; i < renderedNodes.length; i++) {
                if (node.id === renderedNodes[i].id) {

                    }
                }
        }

Seeking to change the (node:any) parameter to something like:

(node:Object)

However, this leads to an error stating "property id does not exist on type Object". While temporary fixes are available, is there a more streamlined approach or best practice in typescript to handle both arrays and objects efficiently?

Appreciate any insights.

Answer №1

If you want to extend the ng.IScope interface with an additional property, simply add the following code snippet:

interface ng.IScope {
    customProperty?: string;
}

With this change, you can easily assign a value to the new property like so:

scope.customProperty = "some value";

To ensure that your TypeScript code compiles successfully, it is important to include all referenced members in your class or interface definitions. If needed, consider creating a separate class that extends existing classes or interfaces.

Additionally, check out the DefinitelyTyped GitHub repository for pre-existing D3 definitions if node is related to D3. Leveraging these definitions can help resolve issues and prevent the need for creating your own custom classes.

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