Improve TS configuration for target and included libs for monorepo packages

[cacieprins]

Currently, TSConfig is spread around and not necessarily mutually compatible between packages in the monorepo.

Discovery:

• align on an ES target version, decide on an upgrade schedule or heuristic for newer ES targets, and catalog all current targets and libs.
• determine if this is a cosmetic issue with Cypress' ts-check script, or if it is indicative of potential build failures.

DevEx / TechDebt pain point this is intended to fix:

Monorepo packages sometimes have older libs and/or targets than the packages that they import. This can break check-ts in interesting ways. Example:

ts/tsconfig.json declares ES2018 as the default target, and includes libraries for ES2018, ES2020.Promise, ES2021.String.

@packages/source-package overrides the included libraries, but not the target. It's still targeting ES2018, but is including all libs for esnext. It makes extensive use of es2022 features, like the # prefix for truly private fields on classes.

@packages/destination-package uses the defaults, and imports portions of @packages/parent-package that use the # prefix for private fields.

ts-check will fail for @packages/destination-package, but will reference the file that uses the # prefix in @packages/source-package.

Acceptance Criteria:

• tsconfig lib and target values are either synchronized across all packages, or values are verified such that dependencies are required to have a subset of their dependent's lib and target values
• Define criteria for upgrading to the next Target. For webpack and browser-targeted ts configurations, this can be derived from a browser version support matrix. For node-targeted tsconfig configurations, this can be derived from the version of node that we build the binary for.

[cypress-app-bot]

This issue has not had any activity in 180 days. Cypress evolves quickly and the reported behavior should be tested on the latest version of Cypress to verify the behavior is still occurring. It will be closed in 14 days if no updates are provided.

[cypress-app-bot]

This issue has been closed due to inactivity.