Fix deprecated packages

.eslintrc.json

@@ -0,0 +1,22 @@
+{
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "ecmaVersion": 2020,
+    "sourceType": "module"
+  },
+  "plugins": [
+    "@typescript-eslint"
+  ],
+  "extends": [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended"
+  ],
+  "env": {
+    "node": true,
+    "mocha": true
+  },
+  "rules": {
+    "no-constant-condition": "off",
+    "no-extra-boolean-cast": "off"
+  }
+}

AGENTS.md

@@ -23,7 +23,7 @@ This file provides guidelines for OpenAI Codex to ensure code quality and consis
 2. **Run All Tests**: `npm test`
 3. **Watch Tests**: `npm run test_watch`
 4. **Coverage**: `npm run cover`
-5. **Lint**: `npx tslint -c tslint.json -p tsconfig.json`
+5. **Lint**: `npx eslint \"src/**/*.ts\" \"tests/**/*.ts\"`
 
 ## Pull Request Guidelines
 

DEVELOPMENT_PLAN.md

@@ -4,15 +4,15 @@ This document outlines possible improvements and future developments for the `TS
 
 ## Code Quality and Tooling
 
-- **Adopt ESLint**: Replace the deprecated TSLint configuration with ESLint to keep the linting ecosystem up to date.
-- **Upgrade Dependencies**: Review and update dependencies regularly to keep up with security fixes and improvements.
+- **Adopt ESLint**: Replace the deprecated TSLint configuration with ESLint to keep the linting ecosystem up to date. *(Implemented)*
+- **Upgrade Dependencies**: Review and update dependencies regularly to keep up with security fixes and improvements. *(Implemented)*
 - **TypeScript Strict Mode**: Consider enabling `strictNullChecks` and other strict compiler options for safer type checking.
 
 ## Testing and CI
 
 - **Increase Test Coverage**: Add more unit tests covering edge cases and error conditions for all data structures.
 - **Continuous Integration**: Configure a modern CI workflow (e.g., GitHub Actions) to automatically run build and tests on each commit.
-- **Coverage Reporting**: Switch from `istanbul` to `nyc` or a modern coverage tool and publish coverage reports.
+- **Coverage Reporting**: Switch from `istanbul` to `nyc` or a modern coverage tool and publish coverage reports. *(Implemented)*
 
 ## New Data Structures