Jason Aden 3168ef75da build: fix secondary entry point es5 output and core Rx references (#14820)
Secondary entry points (testing, static, etc) are rolled up into a
single ESM/ES2015 file, then downleveled to ESM/ES2015. This downleveling
was not working and was producing ESM/ES2015. Also, the @angular/core
package's .babelrc file was missing reference to Rx Observable which
broke the UMD bundle.

Fixes #14730
2017-03-01 15:59:09 -08:00
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