web3.js v1.x to v4.x Provider Handover and Transaction State Persistence

Integration Boundary: Legacy and Modern web3.js Providers

Migrating a client-side application from web3.js v1.x to v4.x involves significant API shifts, specifically moving from callback-based patterns to Promise-based architectures. To avoid downtime, a strategy involving a dual-bundle or a runtime compatibility layer is required to bridge the transition.

A critical concern arises regarding the management of asynchronous state during the handover between the legacy provider instance and the new v4.x instance. Specifically, when a transaction is initiated under v1.x but the application context switches to v4.x before the receipt is mined, the continuity of the event listener and the pending transaction state is not guaranteed.

Given that provider event listeners are bound to specific library instances, it is unclear how to maintain a seamless watch on a transaction hash across different major version instances without risking duplicate notifications or missed state transitions.

• How can pending transaction states be synchronized between a v1.x and v4.x provider instance during a runtime migration?
• Is there a documented mechanism to transfer active event subscriptions from a legacy web3.js provider to a new version instance without re-initializing the connection?