Summary

• Adds AxiosError.ECONNREFUSED = 'ECONNREFUSED' as a typed constant
• Updated in 3 files: lib/core/AxiosError.js, index.d.ts, index.d.cts
• Enables type-safe error code checks without hardcoding strings

Context

Issue #6485 requested the ability to use ECONNREFUSED as a typed constant on AxiosError, similar to existing codes like ECONNABORTED and ETIMEDOUT. Currently users must hardcode the string "ECONNREFUSED".

Test plan

• Verify AxiosError.ECONNREFUSED resolves to 'ECONNREFUSED' at runtime
• Verify TypeScript autocomplete includes ECONNREFUSED on the AxiosError class
• Verify no existing tests break

Summary by cubic

Adds AxiosError.ECONNREFUSED as a typed constant for type-safe error checks and better IDE autocomplete. Synced with v1.x with no functional changes.

Description

• Summary of changes
  • Added ECONNREFUSED to AxiosError in lib/core/AxiosError.js
  • Updated index.d.ts and index.d.cts to expose the new static constant
  • Merged v1.x into this branch (no additional changes)
• Reasoning
  • Avoids hardcoded strings and aligns with existing codes like ECONNABORTED and ETIMEDOUT
• Additional context
  • Closes Add ECONNREFUSED error code to AxiosError typings #6485 by exposing a first-class constant for connection refused errors

Docs

• Add ECONNREFUSED to the list of available AxiosError codes
• Include a small example using AxiosError.ECONNREFUSED in error handling

Testing

• No tests added
• Suggested:
  • Runtime: assert AxiosError.ECONNREFUSED === 'ECONNREFUSED'
  • Types: verify TS autocomplete shows AxiosError.ECONNREFUSED typed as 'ECONNREFUSED'

Semantic version impact

• Minor: backward-compatible addition of a new typed constant to AxiosError

^{Written for commit 644ab15. Summary will update on new commits.}