import mitt from '../../shared/lib/mitt';
class Span {
    end(endTime) {
        if (this.state.state === 'ended') {
            throw Object.defineProperty(new Error('Span has already ended'), "__NEXT_ERROR_CODE", {
                value: "E17",
                enumerable: false
            });
        }
        this.state = {
            state: 'ended',
            endTime: endTime != null ? endTime : Date.now()
        };
        this.onSpanEnd(this);
    }
    constructor(name, options, onSpanEnd){
        this.name = name;
        var _options_attributes;
        this.attributes = (_options_attributes = options.attributes) != null ? _options_attributes : {};
        var _options_startTime;
        this.startTime = (_options_startTime = options.startTime) != null ? _options_startTime : Date.now();
        this.onSpanEnd = onSpanEnd;
        this.state = {
            state: 'inprogress'
        };
    }
}
class Tracer {
    startSpan(name, options) {
        return new Span(name, options, this.handleSpanEnd);
    }
    onSpanEnd(cb) {
        this._emitter.on('spanend', cb);
        return ()=>{
            this._emitter.off('spanend', cb);
        };
    }
    constructor(){
        this._emitter = mitt();
        this.handleSpanEnd = (span)=>{
            this._emitter.emit('spanend', span);
        };
    }
}
export default new Tracer();

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