Add typecheck script

[testerez]

Current typings are failing with @types/[email protected]

Here is the error you get:

node_modules/@types/jest/index.d.ts:729:15 - error TS2428: All declarations of 'Matchers' must have identical type parameters.

729     interface Matchers<R, T> {
                  ~~~~~~~~

types/index.d.ts:5:13 - error TS2428: All declarations of 'Matchers' must have identical type parameters.

5   interface Matchers<R> {
              ~~~~~~~~


Found 2 errors.

Changes:

• Updated @types/[email protected]
• Fixed /types/index.d.ts
• Added a yarn typecheck to easily validate that typings are valid.

[codecov-io]

Codecov Report

Merging #254 (53ab77d) into main (32afe6f) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #254   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          125       125           
  Lines          774       774           
  Branches       115       115           
=========================================
  Hits           774       774           

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[buttilda]

This PR is a duplicate of: #235 which has been open since October... I don't think it's getting merged anytime soon. This project seems pretty abandoned

[SimenB]

thanks!