prefer optional syntax over '| null'
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1 changed files with 2 additions and 2 deletions
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@ -26,10 +26,10 @@ export class BaseMappedList<F,T> extends BaseObservableList<T> {
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protected _sourceUnsubscribe: (() => void) | null = null;
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_mapper: Mapper<F,T>;
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_updater: Updater<F,T>;
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_removeCallback: ((value: T) => void) | null;
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_removeCallback?: (value: T) => void;
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_mappedValues: T[] | null = null;
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constructor(sourceList: BaseObservableList<F>, mapper: Mapper<F,T>, updater: Updater<F,T>, removeCallback: ((value: T) => void) | null = null) {
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constructor(sourceList: BaseObservableList<F>, mapper: Mapper<F,T>, updater: Updater<F,T>, removeCallback?: (value: T) => void) {
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super();
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this._sourceList = sourceList;
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this._mapper = mapper;
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