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events: lazy load perf_hooks for EventTarget by jasnell · Pull Request #33717 · nodejs/node · GitHub

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events: lazy load perf_hooks for EventTarget #33717

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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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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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4 changes: 0 additions & 4 deletions test/parallel/test-bootstrap-modules.js
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,6 @@ const expectedModules = new Set([
'Internal Binding module_wrap',
'Internal Binding native_module',
'Internal Binding options',
'Internal Binding performance',
'Internal Binding process_methods',
'Internal Binding report',
'Internal Binding string_decoder',
Expand All @@ -31,7 +30,6 @@ const expectedModules = new Set([
'Internal Binding types',
'Internal Binding url',
'Internal Binding util',
'NativeModule async_hooks',
'NativeModule buffer',
'NativeModule events',
'NativeModule fs',
Expand All @@ -49,7 +47,6 @@ const expectedModules = new Set([
'NativeModule internal/fixed_queue',
'NativeModule internal/fs/dir',
'NativeModule internal/fs/utils',
'NativeModule internal/histogram',
'NativeModule internal/idna',
'NativeModule internal/linkedlist',
'NativeModule internal/modules/run_main',
Expand Down Expand Up @@ -86,7 +83,6 @@ const expectedModules = new Set([
'NativeModule internal/validators',
'NativeModule internal/vm/module',
'NativeModule path',
'NativeModule perf_hooks',
'NativeModule timers',
'NativeModule url',
'NativeModule util',
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