TS2345: Cannot assign type '(item: cType) => cType' to type '(value: Object, index: number, array: Object[]) => cType' within the parameter

I am currently working on a project using Angular 13 and Typescript 4.5.2.

In addition, I am incorporating the Syncfusion library in my development process, specifically utilizing the datagrid component for managing table data.

For reference, you can check out the Syncfusion data grid documentation as well as this corresponding StackBlitz example.

The data used in the application is stored in the data.ts file. I have encountered an error within this file, specifically in the second line of the code block below:

type cType = { CustomerID: string, ContactName: string, CustomerName: string };
export const data: Object[] = orderData.map((item: cType) => {
    let name: cType = (<cType[]>customerData).filter((cItem: cType) => {
        return cItem.CustomerID === item.CustomerID;
    })[0];
    item.CustomerName = (name || <cType>{}).ContactName;
    return item;
});

I am struggling to pinpoint the exact issue here. Any assistance would be greatly appreciated.

angulartypescriptsyncfusionej2-syncfusion

Answer №1

If you encounter this TS error, simply implement the following code snippet.

interface CustomerType {
    CustomerID: string,
    ContactName: string,
    CustomerName: string
}
export const data: Object[] = orderData.map((item: object) => {
    let name: CustomerType = (<CustomerType[]>customerData).filter((cItem: CustomerType) => {
        return cItem.CustomerID === (item as CustomerType).CustomerID;
    })[0];
    (item as CustomerType).CustomerName = (name || <CustomerType>{}).ContactName;
    return item;
});

Feel free to download a sample for reference:

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