use empty array for ws protocols instead of null
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@ -8,7 +8,7 @@ export class WebSocketClient {
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* @param protocols DOMString|DOMString[] Either a single protocol string or an array of protocol strings. These strings are used to indicate sub-protocols, so that a single server can implement multiple WebSocket sub-protocols (for example, you might want one server to be able to handle different types of interactions depending on the specified protocol). If you don't specify a protocol string, an empty string is assumed.
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* @param options options
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*/
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constructor (url, protocols = null, options = {}) {
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constructor (url, protocols = [], options = {}) {
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this.url = url
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this.protocols = protocols
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