Update to TypeScript 5.5 + ESLint 9.9 #171
Merged
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This PR updates TypeScript to v5.5.x and ESLint to 9.9.x. As part of the ESLint upgrade, several ESLing packages were dropped since they don't support the new flat config.
This PR is a prerequisite to evaluating if we can drop the requirement of
@babel/plugin-proposal-decorators
since native support for decorators in TS was advanced to the stage 3 implementation.