nonSlide

function nonSlide<T>(value: T | GoogleAppsScript.Slides.Slide): value is T;

nonSlide(value) is the same test as !isSlide(value), written so that a guard clause reads as a sentence rather than as a negation.

An Apps Script service object has no constructor a script can test against, so the guard looks for the methods that define the type — getObjectId, getPageElementById. A stub that implements them passes, which is what makes code using this guard testable outside the runtime.

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
`value`	`T \\| GoogleAppsScript.Slides.Slide`	The value to check.

Returns

boolean — true when the value is not a slide; otherwise false.

In TypeScript the guard narrows value to T inside the branch.

Examples

What passes and what does not

const slide = SlidesApp.getActivePresentation().getSlides()[0];

nonSlide({}); // => true
nonSlide(null); // => true
nonSlide(slide); // => false

Source

src/appsscript/slide/nonSlide.ts

23 September 2026

This documentation was generated with AI (Claude) from the library's source code.

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