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With this change we "vendor" TypeScript 3.6 in build optimizer instead of using directly the npm package. Reasons: - We cannot update to a more recent version of TypeScript due to https://github.com/microsoft/TypeScript/issues/38412 - Yarn workspace are not supported under Bazel. This means currently we are running unit testswhich uses a different TypeScript version at runtime. - In TypeScript 3.9, the shape of ES2015 classes changed https://github.com/microsoft/TypeScript/pull/32011, this requires some changes in the UT expects, but this again will not be correct to change now.