This pull request introduces significant changes to the signaling message handling in the ConnectionBase class by replacing hardcoded strings with constants. Additionally, it includes updates to the import statements and type definitions to support these changes.

Refactoring for Signaling Messages:

• packages/sdk/src/base.ts: Replaced hardcoded signaling message types with constants such as SIGNALING_MESSAGE_TYPE_DISCONNECT, SIGNALING_MESSAGE_TYPE_OFFER, and others. This change improves code maintainability and reduces the risk of typos. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21]

Constants and Types:

• packages/sdk/src/constants.ts: Added constants for signaling message types and roles, such as SIGNALING_MESSAGE_TYPE_OFFER, SIGNALING_ROLE_SENDRECV, and others. This centralizes the definitions and makes the code more readable and easier to update.

• packages/sdk/src/types.ts: Updated type definitions to use the newly introduced constants, ensuring type safety and consistency across the codebase. [1] [2] [3]

Import Statements:

• packages/sdk/src/base.ts: Updated import statements to include the newly defined constants and types, ensuring that all necessary dependencies are correctly imported. [1] [2]

These changes collectively improve the maintainability, readability, and consistency of the codebase by centralizing the definitions of signaling message types and roles.