Remove dependency on callsites (#172)

Author: Fryuni

cucumber-tsflow/package-lock.json

@@ -26,7 +26,6 @@
     "url": "https://github.com/timjroberts/cucumber-js-tsflow.git"
   },
   "dependencies": {
-    "callsites": "^4.2.0",
     "log4js": "^6.3.0",
     "source-map-support": "^0.5.19",
     "underscore": "^1.8.3"

cucumber-tsflow/package.json

@@ -1,4 +1,3 @@
-import callsites from "callsites";
 // @ts-ignore
 import * as sourceMapSupport from "source-map-support";
 
@@ -39,3 +38,20 @@ export class Callsite {
     return `${this.filename}:${this.lineNumber}`;
   }
 }
+
+function callsites() {
+  const _prepareStackTrace = Error.prepareStackTrace;
+  try {
+    let result: NodeJS.CallSite[] = [];
+    Error.prepareStackTrace = (_, callSites) => {
+      const callSitesWithoutCurrent = callSites.slice(1);
+      result = callSitesWithoutCurrent;
+      return callSitesWithoutCurrent;
+    };
+
+    new Error().stack; // eslint-disable-line unicorn/error-message, no-unused-expressions
+    return result;
+  } finally {
+    Error.prepareStackTrace = _prepareStackTrace;
+  }
+}