# All files / src/decorators Emit.ts

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100% Branches 10/10
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    1ximport { Doraemon } from '../instance/init'
    import { isPromise } from '../util/isPromise'

    const hyphenateRE = /\B([A-Z])/g
    const hyphenate = (str: string) => str.replace(hyphenateRE, '-$1').toLowerCase()

    /**
     * decorator of an event-emitter function
     *
     * @param  event The name of the event
     * @return MethodDecorator
     */
    export function Emit(event?: string): MethodDecorator {
      return function (_target: Doraemon, propertyKey: string, descriptor: any) {
        const key = hyphenate(propertyKey)
        const original = descriptor.value
        descriptor.value = function emitter(...args: any[]) {
          const emit = (returnValue: any) => {
            const emitName = event || key

            if (returnValue === undefined) {
              if (args.length === 0) {
                this.$emit(emitName)
              } else if (args.length === 1) {
                this.$emit(emitName, args[0])
              } else {
                this.$emit(emitName, ...args)
              }
            } else {
              args.unshift(returnValue)
              this.$emit(emitName, ...args)
            }
          }

          const returnValue: any = original.apply(this, args)

          if (isPromise(returnValue)) {
            returnValue.then(emit)
          } else {
            emit(returnValue)
          }

          return returnValue
        }
      }
    }