How to fix FlowJS error for dynamic Boolean variable assignments?

//Person Type  
type Person{

const canEdit:boolean = person.canDisplayButton && data.anotherEmail;

Flow throws an error saying anotherEmail: string (This type is incompatible with boolean)

How can this be fixed?

Ben R.

If you're trying to determine whether data.anotherEmail is defined, can you not use !!data.anotherEmail to determine truthiness of the variable?

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