kmpdfkit_demo/ios/CompdfkitPdf.swift

@objc(CompdfkitPdf)
class CompdfkitPdf: NSObject {

  @objc(multiply:withB:withResolver:withRejecter:)
  func multiply(a: Float, b: Float, resolve:RCTPromiseResolveBlock,reject:RCTPromiseRejectBlock) -> Void {
    resolve(a*b)
  }
}