Switch to CommonJS friendly is-plain-object

Fix #286

Author: nulltoken

package.json

@@ -51,7 +51,7 @@
     "basic-auth": "^2.0.1",
     "cors": "^2.8.5",
     "express": "^4.18.2",
-    "is-plain-obj": "^4.1.0",
+    "is-plain-object": "^5.0.0",
     "jose": "^4.15.4"
   },
   "devDependencies": {

src/lib/helpers.ts

@@ -19,7 +19,7 @@ import { AssertionError } from 'assert';
 import type { AddressInfo } from 'net';
 import { readFileSync } from 'fs';
 
-import isPlainObject from 'is-plain-obj';
+import { isPlainObject } from 'is-plain-object';
 
 import type { TokenRequest } from './types';
 

yarn.lock

@@ -1952,10 +1952,10 @@ is-path-inside@^3.0.3:
   resolved "https://registry.yarnpkg.com/is-path-inside/-/is-path-inside-3.0.3.tgz#d231362e53a07ff2b0e0ea7fed049161ffd16283"
   integrity sha512-Fd4gABb+ycGAmKou8eMftCupSir5lRxqf4aD/vd0cD2qc4HL07OjCeuHMr8Ro4CoMaeCKDB0/ECBOVWjTwUvPQ==
 
-is-plain-obj@^4.1.0:
-  version "4.1.0"
-  resolved "https://registry.yarnpkg.com/is-plain-obj/-/is-plain-obj-4.1.0.tgz#d65025edec3657ce032fd7db63c97883eaed71f0"
-  integrity sha512-+Pgi+vMuUNkJyExiMBt5IlFoMyKnr5zhJ4Uspz58WOhBF5QoIZkFyNHIbBAtHwzVAgk5RtndVNsDRN61/mmDqg==
+is-plain-object@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/is-plain-object/-/is-plain-object-5.0.0.tgz#4427f50ab3429e9025ea7d52e9043a9ef4159344"
+  integrity sha512-VRSzKkbMm5jMDoKLbltAkFQ5Qr7VDiTFGXxYFXXowVj387GeGNOCsOH6Msy00SGZ3Fp84b1Naa1psqgcCIEP5Q==
 
 is-regex@^1.1.4:
   version "1.1.4"