Function since

Returns elapsed time since the initial call.

// Record start
const elapsed = Stopwatch.since();

// Get elapsed time in millis
// since Elapsed.since()
elapsed(); // Yields number
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If you want to initialise a stopwatch, but not yet start it, consider:

// Init
let state = {
 clicked: Stopwatch.infinity()
};

state.click(); // Returns a giant value

// Later, when click happens:
state = { click: Stopwatch.since() }
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See also:

• once if you want to measure a single period, and stop it.
• interval time between calls