Implement NPX-based CSV SQL query CLI tool

[Copilot]

Implements a command-line tool for querying CSV files using SQL syntax, runnable via npx csvsqlcli.

Implementation

Core Components

• CSV parser with automatic numeric type detection
• SQL query engine supporting SELECT, WHERE (=, !=, <, >, <=, >=, LIKE), AND/OR, ORDER BY, LIMIT
• CLI with three commands: query, info, interactive (placeholder)
• Output formats: table (default), JSON, CSV

Security

• Replaced complex regex patterns with indexOf-based parsing to eliminate ReDoS vulnerabilities
• Query length validation (10KB limit)
• Escaped regex metacharacters in LIKE patterns

Type Safety

• Strict TypeScript configuration
• Explicit types throughout (no any)
• Exported QueryResult interface for library usage

Usage

# Query with filtering and ordering
npx csvsqlcli query data.csv "SELECT name, salary FROM employees WHERE salary > 70000 ORDER BY salary DESC LIMIT 5"

# JSON output
npx csvsqlcli query data.csv "SELECT * FROM data WHERE status = 'active'" --format json

# File info
npx csvsqlcli info data.csv

Testing

17 unit tests covering CSV parsing and SQL operations. Package includes .npmignore and files configuration for NPM publication.

Original prompt

It's a NPX project for querying data from CSV files in CLI

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