This is to verify webdriverio/expect-webdriverio#1496
I ran npm init wdio@latest ./mocha-wdio-demo and npm init wdio@latest ./jasmine-wdio-demo to generate projects with mocha and jasmine respectively.
Type checking behavior can be verified via:
(cd jasmine-wdio-demo && npm ci && ./node_modules/.bin/tsc --noEmit)
(cd mocha-wdio-demo && npm ci && ./node_modules/.bin/tsc --noEmit)