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fix: error trying to do in on a null value in is ui function call #1132

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fix: error trying to do in on a null value in is ui function call #1132

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4 changes: 2 additions & 2 deletions src/document/UI.ts
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Expand Up @@ -19,9 +19,9 @@ export type UIValueString = String & {[UIValue]: true}
export type UISelectionStart = Number & {[UISelection]: true}

export function isUIValue(
value: string | UIValueString,
value: string | UIValueString | null,
): value is UIValueString {
return typeof value === 'object' && UIValue in value
return typeof value === 'object' && value !== null && UIValue in value
}

export function isUISelectionStart(
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