1 | export function createNoopProfiler() {
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2 | return {
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3 | run(fn) {
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4 | return Promise.resolve().then(() => fn());
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5 | },
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6 | collect() {
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7 | return [];
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8 | },
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9 | };
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10 | }
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11 | export function createProfiler() {
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12 | const events = [];
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13 | return {
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14 | collect() {
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15 | return events;
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16 | },
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17 | run(fn, name, cat) {
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18 | let startTime;
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19 | return Promise.resolve()
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20 | .then(() => {
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21 | startTime = process.hrtime();
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22 | })
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23 | .then(() => fn())
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24 | .then(value => {
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25 | const duration = process.hrtime(startTime);
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26 |
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27 |
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28 | const event = {
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29 | name,
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30 | cat,
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31 | ph: 'X',
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32 | ts: hrtimeToMicroseconds(startTime),
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33 | pid: 1,
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34 | tid: 0,
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35 | dur: hrtimeToMicroseconds(duration),
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36 | };
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37 | events.push(event);
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38 | return value;
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39 | });
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40 | },
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41 | };
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42 | }
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43 | function hrtimeToMicroseconds(hrtime) {
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44 | return (hrtime[0] * 1e9 + hrtime[1]) / 1000;
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45 | }
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