23 lines
683 B
TypeScript
23 lines
683 B
TypeScript
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// Copyright 2021 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import emojiRegex from 'emoji-regex/es2015/RGI_Emoji';
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import { getGraphemes } from '../util/grapheme';
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import { take, size } from '../util/iterables';
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export function isValidReactionEmoji(value: unknown): value is string {
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if (typeof value !== 'string') {
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return false;
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}
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// This is effectively `countGraphemes(value) === 1`, but doesn't require iterating
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// through an extremely long string.
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const graphemes = getGraphemes(value);
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const truncatedGraphemes = take(graphemes, 2);
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if (size(truncatedGraphemes) !== 1) {
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return false;
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}
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return emojiRegex().test(value);
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}
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