Specify rootDir so that declarations can always be emitted with the correct paths. #655

Job	Run time
Tests: Type Check	19s
Tests (addon-location)	1m 6s
[email protected] : defaults with npm	1m 52s
Lint JS	24s
Tests (test-app-location)	1m 3s
[email protected] : defaults with yarn	1m 30s
[email protected] : typescript with npm	2m 13s
Tests (addon-only)	30s
[email protected] : defaults with pnpm	1m 5s
[email protected] : typescript with yarn	2m 45s
Tests (monorepo with npm)	1m 33s
[email protected] : defaults with npm	1m 45s
[email protected] : typescript with pnpm	1m 26s
Tests (monorepo with yarn)	1m 15s
[email protected] : defaults with yarn	1m 51s
Tests (monorepo with pnpm)	52s
[email protected] : defaults with pnpm	1m 2s
Tests (rollup-build)	1m 7s
	23m 38s

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