Breaking changes:

- Distinguish request and response data types ([#4116](https://github.com/axios/axios/pull/4116))

- Change never type to unknown ([#4142](https://github.com/axios/axios/pull/4142))

- Fixed TransitionalOptions typings ([#4147](https://github.com/axios/axios/pull/4147))

Fixes and Functionality:

- Adding globalObject: 'this' to webpack config ([#3176](https://github.com/axios/axios/pull/3176))

- Adding insecureHTTPParser type to AxiosRequestConfig ([#4066](https://github.com/axios/axios/pull/4066))

- Fix missing semicolon in typings ([#4115](https://github.com/axios/axios/pull/4115))

- Fix response headers types ([#4136](https://github.com/axios/axios/pull/4136))

Internal and Tests:

- Improve timeout error when timeout is browser default ([#3209](https://github.com/axios/axios/pull/3209))

- Fix node version on CI ([#4069](https://github.com/axios/axios/pull/4069))

- Added testing to TypeScript portion of project ([#4140](https://github.com/axios/axios/pull/4140))

Documentation:

- Rename Angular to AngularJS ([#4114](https://github.com/axios/axios/pull/4114))

Huge thanks to everyone who contributed to this release via code (authors listed below) or via reviews and triaging on GitHub:

- [Jay](mailto:jasonsaayman@gmail.com)

- [Evan-Finkelstein](https://github.com/Evan-Finkelstein)

- [Paweł Szymański](https://github.com/Jezorko)

- [Dobes Vandermeer](https://github.com/dobesv)

- [Claas Augner](https://github.com/caugner)

- [Remco Haszing](https://github.com/remcohaszing)

- [Evgeniy](https://github.com/egmen)

- [Dmitriy Mozgovoy](https://github.com/DigitalBrainJS)