Add eslint config file

Author: kris-szlapa

eslint.config.mjs

@@ -0,0 +1,127 @@
+import globals from "globals";
+import tsParser from "@typescript-eslint/parser";
+import tsPlugin from "@typescript-eslint/eslint-plugin";
+import eslintJsPlugin from "@eslint/js";
+import importNewlines from "eslint-plugin-import-newlines";
+
+const commonConfig = {
+  plugins: {
+    "@typescript-eslint": tsPlugin,
+    "import-newlines": importNewlines,
+  },
+  rules: {
+    ...tsPlugin.configs.recommended.rules,
+    "@typescript-eslint/array-type": [
+      "error",
+      {
+        default: "generic",
+      },
+    ],
+
+    "@typescript-eslint/consistent-type-assertions": [
+      "error",
+      {
+        assertionStyle: "as",
+        objectLiteralTypeAssertions: "never",
+      },
+    ],
+
+    "block-spacing": "error",
+    "brace-style": ["error", "1tbs"],
+    "comma-dangle": ["error", "never"],
+
+    "comma-spacing": [
+      "error",
+      {
+        before: false,
+        after: true,
+      },
+    ],
+
+    "dot-location": ["error", "property"],
+    "eol-last": ["error", "always"],
+    eqeqeq: "error",
+    "func-call-spacing": "error",
+
+    "func-style": [
+      "error",
+      "declaration",
+      {
+        allowArrowFunctions: true,
+      },
+    ],
+
+    "import-newlines/enforce": [
+      "error",
+      {
+        items: 3,
+        "max-len": 120,
+        semi: false,
+      },
+    ],
+
+    indent: [
+      "error",
+      2,
+      {
+        SwitchCase: 1,
+      },
+    ],
+
+    "max-len": ["error", 120],
+    "no-multi-spaces": "error",
+
+    "no-multiple-empty-lines": [
+      "error",
+      {
+        max: 1,
+      },
+    ],
+
+    "no-trailing-spaces": "error",
+    "object-curly-spacing": ["error", "never"],
+
+    quotes: [
+      "error",
+      "double",
+      {
+        allowTemplateLiterals: true,
+        avoidEscape: true,
+      },
+    ],
+
+    semi: ["error", "never"],
+  },
+};
+
+export default [
+  {
+    ignores: ["**/lib/*", "**/coverage/*"],
+  },
+  {
+    rules: eslintJsPlugin.configs.recommended.rules,
+  },
+  {
+    files: ["**/*.ts"],
+
+    languageOptions: {
+      parser: tsParser,
+      globals: {
+        ...globals.node,
+      },
+    },
+    ...commonConfig,
+  },
+  {
+    files: ["**/tests/**/*.ts"],
+
+    languageOptions: {
+      parser: tsParser,
+      globals: {
+        ...globals.jest,
+        ...globals.node,
+      },
+    },
+    ...commonConfig,
+  },
+];