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lib: load internal/errors eagerly in events.js and perf_hooks.js #26771

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lib: load internal/errors eagerly in events.js and perf_hooks.js #26771

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5ead4a0
lib: load internal/errors eagerly in events.js
joyeecheung Mar 19, 2019
7d4d65a
lib: load internal/errors eagerly in perf_hooks.js
joyeecheung Mar 19, 2019
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lib: load internal/errors eagerly in events.js 
Since `internal/errors` is loaded by many builtin modules and is
currently the first module loaded during bootstrap, it is
fine to load it eagerly. We just need to make sure
that `internal/errors` itself load other modules lazily.
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@joyeecheung
joyeecheung committed Mar 19, 2019
commit 5ead4a08175878c698f42157c2ff26effc24ce4d
29 changes: 12 additions & 17 deletions lib/events.js
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,12 @@

var spliceOne;

const {
ERR_INVALID_ARG_TYPE,
ERR_OUT_OF_RANGE,
ERR_UNHANDLED_ERROR
} = require('internal/errors').codes;

function EventEmitter() {
EventEmitter.init.call(this);
}
Expand All @@ -42,17 +48,9 @@ EventEmitter.prototype._maxListeners = undefined;
// added to it. This is a useful default which helps finding memory leaks.
var defaultMaxListeners = 10;

var errors;
function lazyErrors() {
if (errors === undefined)
errors = require('internal/errors').codes;
return errors;
}

function checkListener(listener) {
if (typeof listener !== 'function') {
const errors = lazyErrors();
throw new errors.ERR_INVALID_ARG_TYPE('listener', 'Function', listener);
throw new ERR_INVALID_ARG_TYPE('listener', 'Function', listener);
}
}

Expand All @@ -63,10 +61,9 @@ Object.defineProperty(EventEmitter, 'defaultMaxListeners', {
},
set: function(arg) {
if (typeof arg !== 'number' || arg < 0 || Number.isNaN(arg)) {
const errors = lazyErrors();
throw new errors.ERR_OUT_OF_RANGE('defaultMaxListeners',
'a non-negative number',
arg);
throw new ERR_OUT_OF_RANGE('defaultMaxListeners',
'a non-negative number',
arg);
}
defaultMaxListeners = arg;
}
Expand All @@ -87,8 +84,7 @@ EventEmitter.init = function() {
// that to be increased. Set to zero for unlimited.
EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
if (typeof n !== 'number' || n < 0 || Number.isNaN(n)) {
const errors = lazyErrors();
throw new errors.ERR_OUT_OF_RANGE('n', 'a non-negative number', n);
throw new ERR_OUT_OF_RANGE('n', 'a non-negative number', n);
}
this._maxListeners = n;
return this;
Expand Down Expand Up @@ -183,8 +179,7 @@ EventEmitter.prototype.emit = function emit(type, ...args) {
}

// At least give some kind of context to the user
const errors = lazyErrors();
const err = new errors.ERR_UNHANDLED_ERROR(stringifiedEr);
const err = new ERR_UNHANDLED_ERROR(stringifiedEr);
err.context = er;
throw err; // Unhandled 'error' event
}
Expand Down