added TypeScript type declarations & moved to new eslint flat config

Author: evdama

.eslintignore

@@ -14,14 +14,15 @@ is-it-check
 
 <p>
   <div>... for runtime checks of js & ts apps</div>
-  <div>... because more often than not, static typechecking with typescript for compiletime checks is not enough 🤗</div>
+  <div>... because more often than not, static typechecking with TypeScript for compile time checks is not enough 🤗</div>
 </p>
 
 <ul>
   <li>no dependencies</li>
   <li>ES6+</li>
   <li>tiny & fast</li>
   <li>intuitive to use</li>
+  <li>TypeScript type declarations included</li>
   <li>AMD, Node & browser ready</li>
 </ul>
 

.eslintrc.js

@@ -0,0 +1,70 @@
+module.exports = [
+  {
+    files: [ "**/*.js" ],
+    ignores: [ "eslint.config.js", "is-it-check.min.js" ],
+    // rules are taken from js.configs.recommended
+    rules: {
+      'constructor-super': 'error',
+      'for-direction': 'error',
+      'getter-return': 'error',
+      'no-async-promise-executor': 'error',
+      'no-case-declarations': 'error',
+      'no-class-assign': 'error',
+      'no-compare-neg-zero': 'error',
+      'no-cond-assign': 'error',
+      'no-const-assign': 'error',
+      'no-constant-binary-expression': 'error',
+      'no-constant-condition': 'error',
+      'no-control-regex': 'error',
+      'no-debugger': 'error',
+      'no-delete-var': 'error',
+      'no-dupe-args': 'error',
+      'no-dupe-class-members': 'error',
+      'no-dupe-else-if': 'error',
+      'no-dupe-keys': 'error',
+      'no-duplicate-case': 'error',
+      'no-empty': 'error',
+      'no-empty-character-class': 'error',
+      'no-empty-pattern': 'error',
+      'no-empty-static-block': 'error',
+      'no-ex-assign': 'error',
+      'no-extra-boolean-cast': 'error',
+      'no-fallthrough': 'error',
+      'no-func-assign': 'error',
+      'no-global-assign': 'error',
+      'no-import-assign': 'error',
+      'no-invalid-regexp': 'error',
+      'no-irregular-whitespace': 'error',
+      'no-loss-of-precision': 'error',
+      'no-misleading-character-class': 'error',
+      'no-new-native-nonconstructor': 'error',
+      'no-nonoctal-decimal-escape': 'error',
+      'no-obj-calls': 'error',
+      'no-octal': 'error',
+      'no-prototype-builtins': 'error',
+      'no-redeclare': 'error',
+      'no-regex-spaces': 'error',
+      'no-self-assign': 'error',
+      'no-setter-return': 'error',
+      'no-shadow-restricted-names': 'error',
+      'no-sparse-arrays': 'error',
+      'no-this-before-super': 'error',
+      'no-undef': 'warn',  // set no-undef from error to warn so the build doesn't exit with exit code 1
+      'no-unexpected-multiline': 'error',
+      'no-unreachable': 'error',
+      'no-unsafe-finally': 'error',
+      'no-unsafe-negation': 'error',
+      'no-unsafe-optional-chaining': 'error',
+      'no-unused-labels': 'error',
+      'no-unused-private-class-members': 'error',
+      'no-unused-vars': 'error',
+      'no-useless-backreference': 'error',
+      'no-useless-catch': 'error',
+      'no-useless-escape': 'error',
+      'no-with': 'error',
+      'require-yield': 'error',
+      'use-isnan': 'error',
+      'valid-typeof': 'error'
+    },
+  }
+]