Remove native build system - WASM-only implementation

[devin-ai-integration]

Remove Native Build System - WASM-Only Implementation

Summary

This PR completely removes the native build system (node-gyp, N-API) from libpg-query-node and implements a pure WASM-only build system that doesn't attempt native compilation during npm install.

Key Changes

Removed Native Build Components

• ✅ Deleted binding.gyp (node-gyp configuration)
• ✅ Removed all N-API C++ source files from src/ directory
• ✅ Removed native build dependencies from package.json:
  • @mapbox/node-pre-gyp
  • node-addon-api
  • node-gyp
  • @emnapi/runtime
  • emnapi
• ✅ Removed native build scripts (install, rebuild, configure, etc.)
• ✅ Removed binary distribution configuration

New WASM Implementation

• ✅ Created src/wasm_wrapper.c - Direct C wrapper for libpg_query functions
• ✅ Updated wasm/index.js and wasm/index.cjs to use direct WASM function calls
• ✅ Modified Makefile to export necessary Emscripten runtime methods
• ✅ Updated package.json exports to use WASM for all environments

Architecture Changes

• Async-only API: Sync methods now throw helpful error messages directing users to async alternatives
• Direct C API calls: No more N-API overhead, direct calls to libpg_query functions
• Memory management: Manual pointer allocation/deallocation using Emscripten utilities
• Error handling: Simplified error reporting system

Testing Results

• ✅ WASM build completes successfully (npm run build:wasm)
• ✅ npm install completes without attempting native compilation
• ✅ Core async functionality verified working:
  • parseQuery() - SQL parsing
  • fingerprint() - Query fingerprinting
  • parsePlPgSQL() - PL/pgSQL function parsing
  • deparse() - Parse tree to SQL conversion

Breaking Changes

• Sync methods removed: parseQuerySync, deparseSync, parsePlPgSQLSync, fingerprintSync now throw errors
• Async-only: All operations must use async methods
• Node.js compatibility: Requires Node.js environments that support WASM

Benefits

• 🚀 No native compilation: Eliminates build-time dependencies and compilation issues
• 🌐 True interoperability: Works across all platforms without platform-specific binaries
• 📦 Smaller package: No need to distribute pre-built binaries for multiple platforms
• 🔧 Simplified maintenance: Single WASM build path instead of dual native/WASM system

Migration Guide

Replace sync method calls with async equivalents:

// Before (sync)
const result = parseQuerySync('SELECT 1');

// After (async)  
const result = await parseQuery('SELECT 1');

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Link to Devin run: https://app.devin.ai/sessions/ba4682fadc2649a986280775e0281fbd
Requested by: Dan Lynch ([email protected])

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