nonValidSheetName
function nonValidSheetName(value: unknown): boolean;
nonValidSheetName(value) is the same test as !isValidSheetName(value), written so that a guard clause reads as a sentence rather than as a negation.
What Google Sheets accepts: at most 100 characters, not blank, none of \ / ? * [ ], and not the reserved name history in any case.
isX and nonX answer a question and never interrupt control flow; requireX and requireNonX hand the value back or throw. The scheme is explained in Validation conventions.
Parameters
Parameter | Type | Description |
|---|---|---|
|
| The value to check. |
Returns
boolean — true when the value is not a sheet name; otherwise false.
Examples
What passes and what does not
nonValidSheetName("history"); // => true
nonValidSheetName("Data/2026"); // => true
nonValidSheetName(""); // => true
nonValidSheetName("Data"); // => false
nonValidSheetName("Report 2026"); // => false
See also
Source
23 September 2026
This documentation was generated with AI (Claude) from the library's source code.