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The legacy standalone build optimizer was still used when targetting ES5 due to the new babel-based build optimizer only supporting the analysis of ES2015+ code. Mainly due to the presence of native classes, the new build optimizer is faster and significantly less complex. To fully remove the legacy build optimizer, ES5 downleveling of application code is now also performed by babel when the TypeScript configuration specifies an ES5 target. TypeScript will now internally emit ES2015 in this configuration and ES2015 code will be used as the input to the remainder of the build pipeline. This has been the behavior for third-party packages and now all code will be consistently downleveled to ES5 using the same tooling.