Value in Array is undefined TypeScript-CodePudding

Good morning everyone, I got an error in my foreach with an array:

function setRowData({ json }: NewType): void {
    // foreach key and value in json object
    // fill into an object
    // add object to array
    let tableRows: { id: string; key: string; de: string; it: string; }[] = [];
    Object.entries(json).forEach(([key, value]) => tableRows.push({
        id: key, key: key, de: value, it: (typeof value === 'string' ? value : "")
    }));
    setTableData(tableRows);
}

The error occurs on the line with the following content: id: key, key: key, de: value, it: (typeof value === 'string' ? value : "")

Does anyone know why the value variable called value inside my array is undefined?

In addition I post a photo of it and where the error occurs:

This one is the description of the foreach, why is the second type in the array undefined?

CodePudding user response：

When you use

The error is telling you that you cannot assign unknown to string.

In order to have it typed as string you must either specify it when using Object.entries():

const entries = Object.entries<string>(json);

Or you should specify in your NewType that json is an object with only string as values (using typescript's Record: Record<string, string>)