just learn and test package.json depends version 0.0.1 "dependencies": { "mobx": "4.15.7" } 0.0.2 "peerDependencies": { "mobx": "4.15.7" } 0.0.3 "peerDependencies": { "mobx": "4.x||5.x" } 0.0.4 "dependencies": { "mobx": "4.x||5.x" }