* move test_helpers to the core
* create base tsconfig
* all tsconfigs use the base one
* use test_helpers exposed from the src/core
* move getFieldFormatsRegistry to data plugin
* add test_utils project
* compile types after checkout
* add a stub for platform tsconfig.json
* fix broken import
* fix broken path to the base config
* set tsBuildInfoFile for project without outDir
* do not commit tsbuildinfo file
* do not check output d.ts files
* fix type error
* use separate config to build types
* rollback changes to include paths
* mute import zone error
* rename files to avoid references to tsd
* do not use tsd for type tests
* include all ts files in project
* run buildRefs before type check to ensure the latest version
* store tsbuildinfo locally
* update paths to base config
* comment out core/tsconfig.json
* remove ui path
* fix wrong tsbuildinfo path
* bump ts to v4
* MOAR RAM
* fix type errors for OSS
* first pass on x-pack errors
* second pass on x-pack type errors
* 3rd pass on x-pack type-errors
* mute errors if complex cases
* don't delete if spread suffices
* mute other complex cases
* make User fields optional
* fix optional types
* fix tests
* fix typings for time_range
* fix type errors in x-pack/tests
* rebuild kbn-pm
* remove leftovers from master update
* fix alert tests
* [Telemetry Checker] TS4 Fixes
* bump to 4.0.1-rc
* fix new errors in master
* bump typescript-eslint to version supporting TS v4 syntax
* fix merge commit errors
* update to the stable TS version 4.0.2
* bump ts-eslint to version supporting ts v4
* fix typo
* fix type errors after merge
* update ts in another new package.json
* TEMP: remove me
* Revert "TEMP: remove me"
This reverts commit dc0fc3bae6.
* [Telemetry] Update snapshot for new TS4 SyntaxKind
* bump prettier to support TS v4 syntax
* fix prettier rules
* last style change
* fix new type errors
Co-authored-by: Alejandro Fernández Haro <alejandro.haro@elastic.co>