1 files changed, 20 insertions, 0 deletions
diff --git a/node_modules/rxjs/src/internal/util/createErrorClass.ts b/node_modules/rxjs/src/internal/util/createErrorClass.ts
new file mode 100644
index 0000000..e354fd3
--- /dev/null
+++ b/node_modules/rxjs/src/internal/util/createErrorClass.ts
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+/**
+ * Used to create Error subclasses until the community moves away from ES5.
+ *
+ * This is because compiling from TypeScript down to ES5 has issues with subclassing Errors
+ * as well as other built-in types: https://github.com/Microsoft/TypeScript/issues/12123
+ *
+ * @param createImpl A factory function to create the actual constructor implementation. The returned
+ * function should be a named function that calls `_super` internally.
+ */
+export function createErrorClass<T>(createImpl: (_super: any) => any): T {
+  const _super = (instance: any) => {
+    Error.call(instance);
+    instance.stack = new Error().stack;
+  };
+
+  const ctorFunc = createImpl(_super);
+  ctorFunc.prototype = Object.create(Error.prototype);
+  ctorFunc.prototype.constructor = ctorFunc;
+  return ctorFunc;
+}