Add Linting to a TypeScript Library

Problem/Feature Description

A small open source TypeScript library (string-utils) has recently been published to npm. The team wants to add consistent code quality tooling before accepting community contributions. They've heard that neostandard provides a Standard-like baseline that works well with ESLint v9's modern flat config system, and they want to adopt it.

The project currently has no linting configuration at all — just a tsconfig.json, source files in src/, and a package.json with a build script. The team wants a complete linting setup that: enforces consistent code style across .ts files, can be run manually by contributors, and gives clear errors rather than silently applying fixes.

Output Specification

Produce or modify the following files in-place:

• package.json — updated with necessary devDependencies and npm scripts for linting
• eslint.config.js or eslint.config.mjs — the ESLint flat config using neostandard as the base, with TypeScript support enabled
• A short LINTING.md file documenting: how to run the linter, what the config does, and why TypeScript support was enabled

Do NOT run npm install — just produce the correctly updated files. The grader will inspect the file contents.

Input Files

The following files are provided as inputs. Extract them before beginning.

=============== FILE: package.json =============== { "name": "string-utils", "version": "1.0.0", "description": "Utility functions for string manipulation", "main": "dist/index.js", "types": "dist/index.d.ts", "type": "module", "scripts": { "build": "tsc" }, "devDependencies": { "typescript": "^5.4.0" } }

=============== FILE: tsconfig.json =============== { "compilerOptions": { "target": "ES2022", "module": "NodeNext", "moduleResolution": "NodeNext", "outDir": "dist", "declaration": true, "strict": true }, "include": ["src/**/*.ts"] }

=============== FILE: src/index.ts =============== export function capitalize(s: string): string { if (!s) return s return s.charAt(0).toUpperCase() + s.slice(1) }

export function truncate(s: string, maxLen: number): string { if (s.length <= maxLen) return s return s.slice(0, maxLen) + '...' }