Update Typescript

[dyladan]

Selected option 2

• Update typescript to 5.x
• Document our new minimum typescript version
  • Document a policy for updating typescript in minor versions in the future
• Add a test project to ensure that minimum typescript version can compile using the updated otel dependencies

Option 1 - Update and downlevel types

• Update typescript to latest 4.x version
• Use downlevel-dts to downlevel types to 4.4 (previously supported version)
• Use typesVersions so that old Typescript versions use 4.4 types
• Add a test project to ensure that typescript 4.4 can compile using the updated otel dependencies
• Close Typescript compatiblitly #2329 if not already closed

Option 2 - Update and raise our minimum typescript version

• Update typescript to some later version that allows us to update our dependencies (see chore(deps): lock file maintenance #4834)
• Document our new minimum typescript version
• Possibly log warnings before we actually make this change in order to give users who will be broken a warning

[JamieDanielson]

For folks not in SIG but interested in this issue: this is not yet actionable, we are still reviewing options.

Update 2024-08-07: We've chosen option 2

[JamieDanielson]

Possible duplicate:

• Typescript compatiblitly #2329
• [all] update dependency typescript to latest #3955

[trentm]

A follow-up TODO:

• Change npm run lint:deps to use knip as a devDep rather than via npx. See chore: add 'lint:deps' script to check for unused and unlisted deps opentelemetry-js-contrib#2477 (comment) and following comments.

[david-luna]

I'll look into it :)

[trentm]

See this comment about consensus to set 5.0.x as the new base TypeScript for SDK 2.0: #5145 (comment)