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events: lazy load perf_hooks for EventTarget #33717

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jasnell wants to merge 2 commits into from
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events: lazy load perf_hooks for EventTarget #33717

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47e4fb9
events: lazy load perf_hooks for EventTarget
jasnell Jun 4, 2020
a19d755
fixup! events: lazy load perf_hooks for EventTarget
jasnell Jun 8, 2020
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events: lazy load perf_hooks for EventTarget
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@jasnell
jasnell committed Jun 8, 2020
commit 47e4fb952baf324d3d3ac78ba0685447a575e261
11 changes: 9 additions & 2 deletions lib/internal/event_target.js
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,6 @@ const {
}
} = require('internal/errors');

const perf_hooks = require('perf_hooks');
const { customInspectSymbol } = require('internal/util');
const { inspect } = require('util');

Expand All @@ -30,11 +29,19 @@ const kTarget = Symbol('kTarget');
const kNewListener = Symbol('kNewListener');
const kRemoveListener = Symbol('kRemoveListener');

// Lazy load perf_hooks to avoid the additional overhead on startup
let perf_hooks;
function lazyNow() {
if (perf_hooks === undefined)
perf_hooks = require('perf_hooks');
return perf_hooks.performance.now();
}

class Event {
#type = undefined;
#defaultPrevented = false;
#cancelable = false;
#timestamp = perf_hooks.performance.now();
#timestamp = lazyNow();

// None of these are currently used in the Node.js implementation
// of EventTarget because there is no concept of bubbling or
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