Why ADX expect more values than the given interval

[Aravin]

With 1 internal

Not working 👎🏽

const adx = new ADX(1);
adx.update({ close: 10, high: 11, low: 9});

NotEnoughDataError: Not enough data

Working 👍🏽

onst adx = new ADX(1);
adx.update({ close: 10, high: 11, low: 9});
adx.update({ close: 11, high: 12, low: 5});

With 3 internal

Not working 👎🏽

const adx = new ADX(3);
adx.update({ close: 10, high: 11, low: 9});
adx.update({ close: 11, high: 12, low: 5});
adx.update({ close: 12, high: 13, low: 2});


NotEnoughDataError: Not enough data

Working when I pass 5 values 👍🏽

const adx = new ADX(3); 
adx.update({ close: 10, high: 11, low: 9});
adx.update({ close: 11, high: 12, low: 5});
adx.update({ close: 12, high: 13, low: 2});
adx.update({ close: 14, high: 15, low: 1});
adx.update({ close: 15, high: 16, low: 1});

My understanding must be wrong, please explain.