chore: upgrade ESLint (#64)

Upgrades ESLint and also dumbs the rules down to only the built in
recommended set.

This will lose some nice to have rule configs, but we can always
re-enable them later if we feel the need.

Author: 43081j

eslint.config.js

@@ -0,0 +1,22 @@
+import eslintjs from '@eslint/js';
+
+const {configs: eslintConfigs} = eslintjs;
+
+export default [
+  {
+    ...eslintConfigs.recommended,
+    files: ['**/*.js']
+  },
+  {
+    files: ['test/**/*.js'],
+    languageOptions: {
+      globals: {
+        describe: 'readonly',
+        it: 'readonly',
+        beforeEach: 'readonly',
+        afterEach: 'readonly',
+        expect: 'readonly'
+      }
+    },
+  }
+];

index.js

@@ -1,10 +1,8 @@
 function isErrorInstance(obj) {
-  // eslint-disable-next-line prefer-reflect
   return obj instanceof Error || Object.prototype.toString.call(obj) === '[object Error]';
 }
 
 function isRegExp(obj) {
-  // eslint-disable-next-line prefer-reflect
   return Object.prototype.toString.call(obj) === '[object RegExp]';
 }
 
@@ -73,7 +71,7 @@ function compatibleMessage(thrown, errMatcher) {
   if (isRegExp(errMatcher)) {
     return errMatcher.test(comparisonString);
   } else if (typeof errMatcher === 'string') {
-    return comparisonString.indexOf(errMatcher) !== -1; // eslint-disable-line no-magic-numbers
+    return comparisonString.indexOf(errMatcher) !== -1;
   }
 
   return false;
@@ -100,7 +98,7 @@ function getConstructorName(errorLike) {
     // of the error just in case it's a poorly-constructed error. Please see chaijs/chai/issues/45 to know more.
     constructorName = errorLike.name;
     if (constructorName === '') {
-      const newConstructorName = (new errorLike().name); // eslint-disable-line new-cap
+      const newConstructorName = (new errorLike().name);
       constructorName = newConstructorName || constructorName;
     }
   }