Andrew Kushnir f5a3e44e9d refactor(compiler): remove support for TypeScript 3.9 (#39313)
This commit removes TypeScript 3.9 support.

BREAKING CHANGE:

TypeScript 3.9 is no longer supported, please upgrade to TypeScript 4.0.

PR Close #39313
2020-10-19 14:34:45 -07:00
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