Umbrella issue for v1.0.0

Problem

Summary This issue is an umbrella for the next release of axios. We might add more issues to the `issues to fix` list. Pull Requests [x] Babel & Webpack 3 [x] ESLint shared config (standard) [x] Migrate nodeunit to jasmine [x] Karma with Webpack config [x] Adjust specs to work with new lib interface [x] Substitute custom utils with lodash [ ] Move core / adapters to ESM [ ] Move helpers to ESM [ ] Remove lodash helpers from utils [ ] Move cancel module to ESM [ ] Change external surface Issues to fix Build system - [x] https://github.com/axios/axios/issues/1209 - [x] https://github.com/axios/axios/issues/1259 Utils: - [x] https://github.com/axios/axios/issues/1298 Default instances / Config merge: - [x] https://github.com/axios/axios/pull/533 - [x] https://github.com/axios/axios/issues/1239 - closed in favor of #385 - [ ] https://github.com/axios/axios/issues/1237 - [ ] https://github.com/axios/axios/issues/812 - [ ] https://github.com/axios/axios/issues/369 - [ ] https://github.com/axios/axios/issues/723 - [ ] maybe https://github.com/axios/axios/issues/498 - [ ] https://github.com/axios/axios/issues/385 - [ ] https://github.com/axios/axios/issues/382 - [ ] maybe https://github.com/axios/axios/issues/370 - [ ] https://github.com/axios/axios/issues/369 - [ ] https://github.com/axios/axios/issues/809 - [ ] https://github.com/axios/axios/issues/688 - [ ] https://github.com/axios/axios/issues/587 - [ ] https://github.com/axios/axios/issues/1042 Proxy: - [