@@ -48,6 +48,13 @@ function lazyErrors() {
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return errors ;
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}
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+ function checkListener ( listener ) {
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+ if ( typeof listener !== 'function' ) {
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+ const errors = lazyErrors ( ) ;
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+ throw new errors . ERR_INVALID_ARG_TYPE ( 'listener' , 'Function' , listener ) ;
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+ }
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+ }
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+
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Object . defineProperty ( EventEmitter , 'defaultMaxListeners' , {
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enumerable : true ,
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get : function ( ) {
@@ -195,10 +202,7 @@ function _addListener(target, type, listener, prepend) {
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var events ;
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var existing ;
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- if ( typeof listener !== 'function' ) {
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- const errors = lazyErrors ( ) ;
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- throw new errors . ERR_INVALID_ARG_TYPE ( 'listener' , 'Function' , listener ) ;
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- }
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+ checkListener ( listener ) ;
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events = target . _events ;
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if ( events === undefined ) {
@@ -283,20 +287,16 @@ function _onceWrap(target, type, listener) {
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}
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EventEmitter . prototype . once = function once ( type , listener ) {
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- if ( typeof listener !== 'function' ) {
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- const errors = lazyErrors ( ) ;
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- throw new errors . ERR_INVALID_ARG_TYPE ( 'listener' , 'Function' , listener ) ;
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- }
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+ checkListener ( listener ) ;
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+
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this . on ( type , _onceWrap ( this , type , listener ) ) ;
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return this ;
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} ;
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EventEmitter . prototype . prependOnceListener =
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function prependOnceListener ( type , listener ) {
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- if ( typeof listener !== 'function' ) {
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- const errors = lazyErrors ( ) ;
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- throw new errors . ERR_INVALID_ARG_TYPE ( 'listener' , 'Function' , listener ) ;
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- }
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+ checkListener ( listener ) ;
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+
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this . prependListener ( type , _onceWrap ( this , type , listener ) ) ;
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return this ;
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} ;
@@ -306,10 +306,7 @@ EventEmitter.prototype.removeListener =
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function removeListener ( type , listener ) {
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var list , events , position , i , originalListener ;
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- if ( typeof listener !== 'function' ) {
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- const errors = lazyErrors ( ) ;
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- throw new errors . ERR_INVALID_ARG_TYPE ( 'listener' , 'Function' , listener ) ;
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- }
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+ checkListener ( listener ) ;
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events = this . _events ;
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if ( events === undefined )
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