| 1 | class Stopwatch {
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| 2 | start() {
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| 3 | this.start = Date.now();
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| 4 | this.end = undefined;
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| 5 | }
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| 6 |
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| 7 | stop() {
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| 8 | if (typeof this.start !== 'number') {
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| 9 | throw new TypeError('.start() has not been called');
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| 10 | }
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| 11 |
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| 12 | if (typeof this.end === 'number') {
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| 13 | throw new TypeError('.stop() has already been called');
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| 14 | }
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| 15 |
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| 16 | this.end = Date.now();
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| 17 | }
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| 18 |
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| 19 | get duration() {
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| 20 | if (typeof this.end !== 'number') {
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| 21 | throw new TypeError('.stop() has not been called');
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| 22 | }
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| 23 |
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| 24 | return Math.round((this.end - this.start) / 1000);
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| 25 | }
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| 26 | }
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| 27 |
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| 28 | module.exports = Stopwatch;
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