How do you use the Bootstrap JavaScript API?

<div class="collapse" id="c1"><div class="card card-body">Content</div></div>

const el = document.getElementById('c1');
const instance = bootstrap.Collapse.getOrCreateInstance(el, { toggle: false });
el.addEventListener('shown.bs.collapse', () => console.log('event: shown.bs.collapse'));
instance.show();
await new Promise(r => setTimeout(r, 600));
console.log('open: ' + el.classList.contains('show'));

See Bootstrap JavaScript.

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