Merging arrays with the power of ES6 spread operator in Typescript

My goal is to merge two arrays into one using the spread object method as shown in the code snippet below:

const queryVariable = {
      ...this.state,
      filters: [...Object.keys(extraFilters || {}), ...this.state.filters],
    }

The this.state.filters variable represents an array in this case. However, TypeScript is throwing the following error message:

Type must have a '[Symbol.iterator]()' method that returns an iterator.

I'm not sure what I'm doing incorrectly here. Can someone help provide guidance on how to correct this issue?

javascripttypescriptecmascript-6

Answer №2

The issue being raised could possibly be related to the usage of the spread operator on objects within the this.state property, which is a feature introduced in ES2018.

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