From 99f18ae5d19ff167b8391eabcdec18a46eb1cba2 Mon Sep 17 00:00:00 2001
From: ssube <seansube@gmail.com>
Date: Sat, 27 Mar 2021 18:22:36 -0500
Subject: [PATCH] feat(reflect): handle missing prototypes

Typescript 4.2 fixed a return type for objects without a prototype.
This change throws an InvalidValueError for these, rather than the
TypeError that was previously thrown.
---
 .gitignore                |  1 +
 package.json              |  4 ++--
 src/Reflect.ts            |  8 +++++++-
 test/utils/TestReflect.ts |  9 +++++++++
 yarn.lock                 | 21 +++++++++++++--------
 5 files changed, 32 insertions(+), 11 deletions(-)

diff --git a/.gitignore b/.gitignore
index f069d17..dae5c97 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 .awcache/
 .licenses/
 .nyc_output/
+.vscode/
 node_modules/
 out/
 temp/
diff --git a/package.json b/package.json
index d4e2dd0..6df8975 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,7 @@
     "@types/lodash": "4.14.168",
     "@types/mocha": "8.2.2",
     "@types/mock-fs": "4.13.0",
-    "@types/node": "14.14.25",
+    "@types/node": "14.14.37",
     "@types/sinon-chai": "3.2.5",
     "@types/source-map-support": "0.5.3",
     "@typescript-eslint/eslint-plugin": "4.19.0",
@@ -73,7 +73,7 @@
     "tslint-etc": "1.13.9",
     "tslint-microsoft-contrib": "6.2.0",
     "tslint-sonarts": "1.9.0",
-    "typescript": "4.1.3"
+    "typescript": "4.2.3"
   },
   "nyc": {
     "extends": "@istanbuljs/nyc-config-typescript"
diff --git a/src/Reflect.ts b/src/Reflect.ts
index 8381077..ebb724e 100644
--- a/src/Reflect.ts
+++ b/src/Reflect.ts
@@ -1,3 +1,4 @@
+import { InvalidArgumentError } from './error/InvalidArgumentError';
 import { doesExist, isNil } from './Maybe';
 
 /* eslint-disable-next-line @typescript-eslint/ban-types */
@@ -50,5 +51,10 @@ export function getMethods<TValue extends Reflectable>(value: TValue): Set<Metho
  * @public
  */
 export function constructorName(val: Reflectable) {
-  return getConstructor(Reflect.getPrototypeOf(val)).name;
+  const proto = Reflect.getPrototypeOf(val);
+  if (isNil(proto)) {
+    throw new InvalidArgumentError('value has no prototype');
+  } else {
+    return getConstructor(proto).name;
+  }
 }
diff --git a/test/utils/TestReflect.ts b/test/utils/TestReflect.ts
index 90aa88e..7b89d7f 100644
--- a/test/utils/TestReflect.ts
+++ b/test/utils/TestReflect.ts
@@ -1,4 +1,5 @@
 import { expect } from 'chai';
+import { InvalidArgumentError } from '../../src';
 import { getMethods, getConstructor, constructorName } from '../../src/Reflect';
 
 class Test {
@@ -29,5 +30,13 @@ describe('reflect utils', () => {
       const instance = new Test();
       expect(constructorName(instance)).to.equal(Test.name);
     });
+
+    it('should throw when value has no prototype', () => {
+      /* eslint-disable-next-line no-null/no-null */
+      const protoless = Object.create(null, {});
+      expect(() => constructorName(protoless)).to.throw(InvalidArgumentError);
+    });
+
+    xit('should handle nil values');
   });
 });
diff --git a/yarn.lock b/yarn.lock
index b9fe70e..9c4fca1 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -423,10 +423,10 @@
   resolved "https://artifacts.apextoaster.com/repository/group-npm/@types/node/-/node-10.17.13.tgz#ccebcdb990bd6139cd16e84c39dc2fb1023ca90c"
   integrity sha512-pMCcqU2zT4TjqYFrWtYHKal7Sl30Ims6ulZ4UFXxI4xbtQqK/qqKwkDoBFCfooRqqmRu9vY3xaJRwxSh673aYg==
 
-"@types/node@14.14.25":
-  version "14.14.25"
-  resolved "https://artifacts.apextoaster.com/repository/group-npm/@types/node/-/node-14.14.25.tgz#15967a7b577ff81383f9b888aa6705d43fbbae93"
-  integrity sha512-EPpXLOVqDvisVxtlbvzfyqSsFeQxltFbluZNRndIb8tr9KiBnYNLzrc1N3pyKUCww2RNrfHDViqDWWE1LCJQtQ==
+"@types/node@14.14.37":
+  version "14.14.37"
+  resolved "https://artifacts.apextoaster.com/repository/group-npm/@types/node/-/node-14.14.37.tgz#a3dd8da4eb84a996c36e331df98d82abd76b516e"
+  integrity sha512-XYmBiy+ohOR4Lh5jE379fV2IU+6Jn4g5qASinhitfyO71b/sCo6MKsMLF5tc7Zf2CE8hViVQyYSobJNke8OvUw==
 
 "@types/normalize-package-data@^2.4.0":
   version "2.4.0"
@@ -4641,16 +4641,21 @@ typedarray@^0.0.6:
   resolved "https://artifacts.apextoaster.com/repository/group-npm/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
   integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
 
-typescript@4.1.3, typescript@~4.1.3:
-  version "4.1.3"
-  resolved "https://artifacts.apextoaster.com/repository/group-npm/typescript/-/typescript-4.1.3.tgz#519d582bd94cba0cf8934c7d8e8467e473f53bb7"
-  integrity sha512-B3ZIOf1IKeH2ixgHhj6la6xdwR9QrLC5d1VKeCSY4tvkqhF2eqd9O7txNlS0PO3GrBAFIdr3L1ndNwteUbZLYg==
+typescript@4.2.3:
+  version "4.2.3"
+  resolved "https://artifacts.apextoaster.com/repository/group-npm/typescript/-/typescript-4.2.3.tgz#39062d8019912d43726298f09493d598048c1ce3"
+  integrity sha512-qOcYwxaByStAWrBf4x0fibwZvMRG+r4cQoTjbPtUlrWjBHbmCAww1i448U0GJ+3cNNEtebDteo/cHOR3xJ4wEw==
 
 typescript@^3.0.0:
   version "3.6.3"
   resolved "https://artifacts.apextoaster.com/repository/group-npm/typescript/-/typescript-3.6.3.tgz#fea942fabb20f7e1ca7164ff626f1a9f3f70b4da"
   integrity sha512-N7bceJL1CtRQ2RiG0AQME13ksR7DiuQh/QehubYcghzv20tnh+MQnQIuJddTmsbqYj+dztchykemz0zFzlvdQw==
 
+typescript@~4.1.3:
+  version "4.1.3"
+  resolved "https://artifacts.apextoaster.com/repository/group-npm/typescript/-/typescript-4.1.3.tgz#519d582bd94cba0cf8934c7d8e8467e473f53bb7"
+  integrity sha512-B3ZIOf1IKeH2ixgHhj6la6xdwR9QrLC5d1VKeCSY4tvkqhF2eqd9O7txNlS0PO3GrBAFIdr3L1ndNwteUbZLYg==
+
 uglify-js@^3.1.4:
   version "3.6.0"
   resolved "https://artifacts.apextoaster.com/repository/group-npm/uglify-js/-/uglify-js-3.6.0.tgz#704681345c53a8b2079fb6cec294b05ead242ff5"