Angular 2 with Babel"Babel*" above means Babel with the following official plugins: babel-preset-es2015babel-plugin-transform-class-propertiesbabel-plugin-transform-decorators-legacy (not literally official but maintained by @loganfsmyth, one of Babel's core contributors)Property decorator in Babel is marked "Partial" because babel-plugin-transform-decorators-legacy ignores class properties without initializers. You
