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26 lines
828 B
26 lines
828 B
5 years ago
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module.exports = (subscription, initialStats, onChange) => {
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let stats = [...initialStats]
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const remove = value => {
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stats = stats.filter(target => target.id !== value.id)
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return onChange(stats)
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}
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const upsert = value => {
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let existed = false;
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stats = stats.map(target => (target.id === value.id ? ((existed = true), value) : target))
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if (!existed) stats = [value, ...stats]
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return onChange(stats)
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}
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subscription.on('create', upsert)
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subscription.on('update', upsert)
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subscription.on('enter', upsert)
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subscription.on('leave', remove)
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subscription.on('delete', remove)
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return () => {
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subscription.off('create', upsert)
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subscription.off('update', upsert)
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subscription.off('enter', upsert)
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subscription.off('leave', remove)
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subscription.off('delete', remove)
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}
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}
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