[O] Optimize nullable format
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@@ -8,7 +8,7 @@ export interface Index
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export default class Navigator
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export default class Navigator
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{
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{
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private activeIndex: Index;
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private activeIndex: Index;
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private updateCallback: (() => void) | undefined;
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private updateCallback?: () => void;
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/**
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/**
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* Update index
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* Update index
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