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build: Update TypeScript, use @typescript-eslint #17251
Description of Change
This PR updates our TypeScript version to 3.3.3333 (don't ask), which is an all-around better version of TypeScript without breaking any code we have today.
That upgrade surfaced an issue with typescript-eslint-parser, which is deprecated and archived. The new kid on the block is typescript-eslint, which is better and actually found some issues in our code.
The only change that requires explanation is the removal of