Fix: Add backward compatibility for TypeScript 4.3+ and older module resolution

[millerm30]

Problem:

Customers using TypeScript 4.3.x with "moduleResolution": "node" cannot upgrade from SDK v0.14.0 to v2.5.0 due to module resolution issues. If you could test this that would be great. I have tested this with two configs for typescript and a javascript config and all works. When working with an sdk I will npm run build, npm pack then copy the .tgz file to the test setup and run npm i ./name-of-file-here.tgz

Customer Impact

• Error: Cannot find module 'notificationapi-node-server-sdk' or its corresponding type declarations
• Affected: Projects using TypeScript < 4.7 with classic module resolution
• Workaround: Requires changing moduleResolution to node16/nodenext and restructuring import statements across entire codebase

Trello Ticket:

https://trello.com/c/Ng6FdIum/3525-polyunity-node-update-help

Root Cause

The issue: TypeScript 4.3.x doesn't fully support the "exports" field (support was added in TypeScript 4.7), causing module resolution to fail.

Solution:

Added multi-layered backward compatibility without breaking modern environments:

How It Works:

• Modern TypeScript (4.7+): Uses exports field with conditional exports
• Older TypeScript (4.3+): Falls back to main and types fields
• Intermediate versions: Can use typesVersions mapping

Testing:

Test Scenarios

• CommonJS require() resolution
• ESM import resolution
• TypeScript declaration file access
• Existing customer upgrade path

Benefits:

• Zero breaking changes - All existing customers continue to work
• Seamless upgrades - Customers can upgrade without code changes
• Future-proof - Maintains optimal experience for modern environments
• Broad compatibility - Works across TypeScript 4.3+ to latest

Customer Experience:

Before:

// Failed with TS 4.3.x + moduleResolution: "node"
import notificationapi from 'notificationapi-node-server-sdk'; //  Module not found

After:

// Works seamlessly across all supported TypeScript versions
import notificationapi from 'notificationapi-node-server-sdk'; //  Resolves correctly

[GreyNewfie]

Tested and worked:

• Node setup using typescript 4.3 with "moduleResolution": "node"
• Node setup using typescript 5.3 with "moduleResolution": "bundler" and "moduleResolution": "node16"
• Node setup using commonJS import and ESM import (no typescript)