Replace promise polyfill for a pure one #180
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Description
This PR replaces the
core-jspromise polyfill by thepromise-polyfillpackage.According to this comment
zone.js's promise doesn't pass the feature detection thatcore-jsdoes, which causescore-jsto try to polyfill it again. This throws an error in zone.js. The newpromise-polyfilljust checks if there's a global 'Promise' object available or not, instead of doing feature detection. As a bonus, it reduces the final bundle size in ~3kb.References
fix #179
zloirock/core-js#608 (comment)