adding tsc locally to devdependecies

[coveralls]

Coverage remained the same at 91.045% when pulling c55426374da5cc8261d6638746834296eb381631 on tryko:pr/tsc-locally into 1aa9298b79e35dc728c5ebb93c0d62af33ef7d19 on urish:master.

[urish]

Thanks! Can you please explain why you needed it? In general, yarn should make available the dependencies from the parent package.json to all child packages, so we don't have to maintain common dependency numbers in sync in each individual subpackage.

Didn't that work for you?

[radotzki]

@urish it didn't work with old version of yarn, however with yarn 1.6.0 it works.

[urish]

Then let's set the minimal required yarn version in the. engines section of the top level package.json