2019-03-14 12:23:15 +00:00
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import { HashtagNode, MfmForest } from '../mfm/prelude';
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2018-12-20 10:41:04 +00:00
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import { preorderF } from '../prelude/tree';
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import { unique } from '../prelude/array';
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export default function(mfmForest: MfmForest): string[] {
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const hashtagNodes = preorderF(mfmForest).filter(x => x.type === 'hashtag') as HashtagNode[];
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const hashtags = hashtagNodes.map(x => x.props.hashtag);
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return unique(hashtags);
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}
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