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GeezerVison is showing github.com — events: extract listener check as a function · nodejs/node@dd89cfe

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`‎lib/events.js‎`

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+13-16Lines changed: 13 additions & 16 deletions

Original file line number	Diff line number	Diff line change
`@@ -48,6 +48,13 @@ function lazyErrors() {`
`48`	`48`	`return errors;`
`49`	`49`	`}`
`50`	`50`
	`51`	`+function checkListener(listener) {`
	`52`	`+ if (typeof listener !== 'function') {`
	`53`	`+ const errors = lazyErrors();`
	`54`	`+ throw new errors.ERR_INVALID_ARG_TYPE('listener', 'Function', listener);`
	`55`	`+ }`
	`56`	`+}`
	`57`	`+`
`51`	`58`	`Object.defineProperty(EventEmitter, 'defaultMaxListeners', {`
`52`	`59`	`enumerable: true,`
`53`	`60`	`get: function() {`
`@@ -195,10 +202,7 @@ function _addListener(target, type, listener, prepend) {`
`195`	`202`	`var events;`
`196`	`203`	`var existing;`
`197`	`204`
`198`		`- if (typeof listener !== 'function') {`
`199`		`- const errors = lazyErrors();`
`200`		`- throw new errors.ERR_INVALID_ARG_TYPE('listener', 'Function', listener);`
`201`		`- }`
	`205`	`+ checkListener(listener);`
`202`	`206`
`203`	`207`	`events = target._events;`
`204`	`208`	`if (events === undefined) {`
`@@ -283,20 +287,16 @@ function _onceWrap(target, type, listener) {`
`283`	`287`	`}`
`284`	`288`
`285`	`289`	`EventEmitter.prototype.once = function once(type, listener) {`
`286`		`- if (typeof listener !== 'function') {`
`287`		`- const errors = lazyErrors();`
`288`		`- throw new errors.ERR_INVALID_ARG_TYPE('listener', 'Function', listener);`
`289`		`- }`
	`290`	`+ checkListener(listener);`
	`291`	`+`
`290`	`292`	`this.on(type, _onceWrap(this, type, listener));`
`291`	`293`	`return this;`
`292`	`294`	`};`
`293`	`295`
`294`	`296`	`EventEmitter.prototype.prependOnceListener =`
`295`	`297`	`function prependOnceListener(type, listener) {`
`296`		`- if (typeof listener !== 'function') {`
`297`		`- const errors = lazyErrors();`
`298`		`- throw new errors.ERR_INVALID_ARG_TYPE('listener', 'Function', listener);`
`299`		`- }`
	`298`	`+ checkListener(listener);`
	`299`	`+`
`300`	`300`	`this.prependListener(type, _onceWrap(this, type, listener));`
`301`	`301`	`return this;`
`302`	`302`	`};`
`@@ -306,10 +306,7 @@ EventEmitter.prototype.removeListener =`
`306`	`306`	`function removeListener(type, listener) {`
`307`	`307`	`var list, events, position, i, originalListener;`
`308`	`308`
`309`		`- if (typeof listener !== 'function') {`
`310`		`- const errors = lazyErrors();`
`311`		`- throw new errors.ERR_INVALID_ARG_TYPE('listener', 'Function', listener);`
`312`		`- }`
	`309`	`+ checkListener(listener);`
`313`	`310`
`314`	`311`	`events = this._events;`
`315`	`312`	`if (events === undefined)`

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