fix: use declare keyword to override property type from parent class
#682
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This syntax is supported since TypeScript 3.7 and is required since ES2022 (or the current ESNext).
See microsoft/TypeScript#33509 for extra details.
When overriding the type of a property from a parent class without setting an initial value, the keyword
declareshould be used to prevent the property from being initialized to undefined.Replaces and closes #681.