fix: add setPrototypeOf polyfill (getsentry#2127)

lext-7 · HazAT · commit 5bfb7587514f · 2019-06-27T16:22:07.000+02:00
diff --git a/packages/utils/src/error.ts b/packages/utils/src/error.ts
@@ -1,3 +1,5 @@
+import { setPrototypeOf } from './polyfill';
+
 /** An error emitted by Sentry SDKs and related utilities. */
 export class SentryError extends Error {
   /** Display name of this error instance. */
@@ -8,6 +10,6 @@ export class SentryError extends Error {
 
     // tslint:disable:no-unsafe-any
     this.name = new.target.prototype.constructor.name;
-    Object.setPrototypeOf(this, new.target.prototype);
+    setPrototypeOf(this, new.target.prototype);
   }
 }
diff --git a/packages/utils/src/polyfill.ts b/packages/utils/src/polyfill.ts
@@ -0,0 +1,25 @@
+export const setPrototypeOf =
+  Object.setPrototypeOf || ({ __proto__: [] } instanceof Array ? setProtoOf : mixinProperties);
+
+/**
+ * setPrototypeOf polyfill using __proto__
+ */
+function setProtoOf<TTarget extends object, TProto>(obj: TTarget, proto: TProto): TTarget & TProto {
+  // @ts-ignore
+  obj.__proto__ = proto;
+  return obj as TTarget & TProto;
+}
+
+/**
+ * setPrototypeOf polyfill using mixin
+ */
+function mixinProperties<TTarget extends object, TProto>(obj: TTarget, proto: TProto): TTarget & TProto {
+  for (const prop in proto) {
+    if (!obj.hasOwnProperty(prop)) {
+      // @ts-ignore
+      obj[prop] = proto[prop];
+    }
+  }
+
+  return obj as TTarget & TProto;
+}

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,5 @@`
	`1`	`+import { setPrototypeOf } from './polyfill';`
	`2`	`+`
`1`	`3`	`/** An error emitted by Sentry SDKs and related utilities. */`
`2`	`4`	`export class SentryError extends Error {`
`3`	`5`	`/** Display name of this error instance. */`
`@@ -8,6 +10,6 @@ export class SentryError extends Error {`
`8`	`10`
`9`	`11`	`// tslint:disable:no-unsafe-any`
`10`	`12`	`this.name = new.target.prototype.constructor.name;`
`11`		`- Object.setPrototypeOf(this, new.target.prototype);`
	`13`	`+ setPrototypeOf(this, new.target.prototype);`
`12`	`14`	`}`
`13`	`15`	`}`