This PR implements cross-platform compatibility for the Twilio Node.js SDK, enabling it to run in Cloudflare Workers and other JavaScript runtimes without Node.js-specific dependencies.

Problem

The Twilio SDK previously failed in Cloudflare Workers with the error:

Cannot read properties of undefined (reading 'fd')

This occurred because the SDK relied on Node.js-specific modules likefs,https,Buffer, andprocess that aren't available in the Workers runtime.

Solution

Implemented automatic runtime detection and conditional module loading:

1. Runtime Detection (src/base/runtime.ts) - Detects Node.js vs Cloudflare Workers vs Browser environments
2. Cross-Platform HTTP Client (src/base/FetchRequestClient.ts) - Uses fetch API instead of axios for non-Node.js environments
3. Adaptive RequestClient - Automatically selects the appropriate HTTP implementation
4. Cross-Platform Authentication - Updated auth strategies to use Web APIs when Node.js Buffer isn't available
5. Environment Variable Handling - Accepts env vars via options parameter in Workers

Usage in Cloudflare Workers

importTwiliofrom'twilio';exportdefault{asyncfetch(request,env){constclient=newTwilio(env.TWILIO_ACCOUNT_SID,env.TWILIO_AUTH_TOKEN,{env:{TWILIO_ACCOUNT_SID:env.TWILIO_ACCOUNT_SID,TWILIO_AUTH_TOKEN:env.TWILIO_AUTH_TOKEN}});constmessage=awaitclient.messages.create({body:'Hello from Cloudflare Workers!',from:'+1234567890',to:'+0987654321'});returnnewResponse(JSON.stringify({sid:message.sid}));}}

Benefits

• ✅Zero Breaking Changes - Existing Node.js code continues to work unchanged
• ✅Automatic Environment Detection - No manual configuration required
• ✅Full API Compatibility - All Twilio features work in Workers
• ✅Better Performance - Uses native fetch API optimized for edge environments
• ✅Smaller Bundle Size - Eliminates Node.js dependencies in Workers

Files Changed

• src/base/runtime.ts - New runtime detection utilities
• src/base/FetchRequestClient.ts - New fetch-based HTTP client
• src/base/RequestClient.ts - Updated to auto-select HTTP implementation
• src/base/BaseTwilio.ts - Cross-platform environment variable handling
• src/auth_strategy/BasicAuthStrategy.ts - Cross-platform base64 encoding
• src/auth_strategy/TokenAuthStrategy.ts - Conditional JWT parsing

The implementation maintains full backward compatibility while extending support to new JavaScript runtimes.

Fixes#1096.

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