10 lines
385 B
TypeScript
10 lines
385 B
TypeScript
import { HashtagNode, MfmForest } from '../mfm/prelude';
|
|
import { preorderF } from '../prelude/tree';
|
|
import { unique } from '../prelude/array';
|
|
|
|
export default function(mfmForest: MfmForest): string[] {
|
|
const hashtagNodes = preorderF(mfmForest).filter(x => x.type === 'hashtag') as HashtagNode[];
|
|
const hashtags = hashtagNodes.map(x => x.props.hashtag);
|
|
return unique(hashtags);
|
|
}
|