Migrate away from Axios

[brionmario]

Purpose

This pull request migrates the browser SDK's HTTP client implementation from Axios to a new native Fetch-based client. It removes all Axios dependencies and related legacy code, introduces a new FetchHttpClient class, and updates all usages and type references to use the new client. This modernizes the HTTP layer and reduces external dependencies.

The most important changes are:

HTTP Client Migration:

• Introduced a new FetchHttpClient class in packages/browser/src/FetchHttpClient.ts, implementing the HTTP client using the native Fetch API and a singleton pattern for instance management.
• Removed the legacy Axios-based client: deleted axios-http-client.ts and its exports, and removed all imports and references to HttpClientInstance and Axios types throughout the codebase. [1] [2] [3] [4] [5] [6]
• Updated all usages of the HTTP client in legacy code to use FetchHttpClient or the new HttpClient interface from @asgardeo/javascript instead of the old Axios-based client. [1] [2] [3] [4] [5] [6] [7]

Dependency Cleanup:

• Removed axios from packages/browser/package.json and removed the old brace-expansion package in favor of @isaacs/brace-expansion in the root package.json. [1] [2]

Type and Interface Updates:

• Updated function signatures, type annotations, and callback interfaces to use the new client types, ensuring type safety and consistency with the new implementation. [1] [2] [3] [4] [5]

This change streamlines the SDK, reduces dependencies, and aligns the HTTP client implementation with modern browser APIs.

Related Issues

• Move from axios to fetch #372

Related PRs

• N/A

Checklist

• Followed the CONTRIBUTING guidelines.
• Manual test round performed and verified.
• Documentation provided. (Add links if there are any)
• Unit tests provided. (Add links if there are any)

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines?
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets?

[asgardeo-github-bot]

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