convert hasStack to TS (#2471)

Author: AnastasiiaSvietlova

packages/core/src/event.ts

@@ -1,6 +1,6 @@
 import { App, Device, FeatureFlag, Logger, Request, Stackframe, Thread, User, BugsnagError, NotifiableError } from "./common"
 
-import ErrorStackParser from './lib/error-stack-parser'
+import ErrorStackParser from 'error-stack-parser'
 // @ts-expect-error no types
 import StackGenerator from 'stack-generator'
 import hasStack from './lib/has-stack'

packages/core/src/lib/error-stack-parser.js

@@ -1,6 +1,8 @@
 // Given `err` which may be an error, does it have a stack property which is a string?
-module.exports = err =>
+const hasStack = (err: any): boolean =>
   !!err &&
   (!!err.stack || !!err.stacktrace || !!err['opera#sourceloc']) &&
   typeof (err.stack || err.stacktrace || err['opera#sourceloc']) === 'string' &&
   err.stack !== `${err.name}: ${err.message}`
+
+export default hasStack