Bump TS devDep to 5.0 RC to fix eslint #53243
Merged
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The version of TypeScript that we had in our package.json was an old build that predated some API changes (specifically the monomorphization changes). However, ts-eslint has now updated to support 5.0 and assumes the new APIs are present, so we broke on the dependency bump last night.
#53151 would have caught this, but it's not merged.