16 lines
743 B
TypeScript
16 lines
743 B
TypeScript
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/**
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* Whether a User-Agent string belongs to a phone or tablet.
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*
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* Used for one thing: choosing the results view before the first paint, when
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* the viewport is not yet known. A wrong answer is corrected client-side (see
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* HomeView's MAP_DEFAULT_MIN_WIDTH), so this errs towards "handheld" and is
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* kept deliberately small rather than a full UA parser.
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*
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* iPadOS reports a desktop Mac UA by default and so reads as desktop here,
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* which is the right call: a landscape iPad has room for the map layout.
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*/
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const HANDHELD = /Mobi|Android|iPhone|iPad|iPod|Tablet|Silk|Kindle|PlayBook|BlackBerry|Opera Mini|IEMobile/i;
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export function isHandheldUserAgent(ua: string | null | undefined): boolean {
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return !!ua && HANDHELD.test(ua);
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}
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