When attempting to add a string to a TypeScript array, I am encountering an error stating 'cannot push to undefined'. Is this the correct approach, or should I be using the spread operator instead?
api.ts
const api: IConfigName = {name: "getKey"};
const Name = "Web";
api.optionalParam.push(Name);
IConfig.interface.ts
export interface IConfigName {
name: string;
optionalParam?: string[];
}
To start, you should set up optionalParam as an empty array like this:
api.optionalParam = [];
api.optionalParam.push(Name);
If you are receiving this message, it is likely because the "optionalParam" has not been defined in your api object.
Currently, your api object only contains one other parameter, which is "name".
To resolve this issue, consider adding optionalParam in the following manner:
const api: IConfigName = {name: "getKey", optionalParam:[] };
const Name = "Web";
api.optionalParam.push(Name);
By implementing these changes, your code should function properly as the api object will now include an optionalParam key with a type of array.
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