Merge pull request #279 from SergeAstapov/lint-import-extensions #760

Job	Run time
Lint JS	17s
Tests: Type Check	12s
Slow tests: defaults with npm	1m 51s
Tests (addon-location)	1m 27s
Slow tests: defaults with yarn	1m 31s
Slow tests: typescript with npm	2m 8s
Tests (test-app-location)	57s
Slow tests: defaults with pnpm	59s
Slow tests: typescript with yarn	1m 49s
Slow tests: typescript with pnpm	1m 34s
Tests (addon-only)	27s
Tests (monorepo with npm)	1m 31s
Tests (monorepo with yarn)	1m 11s
Tests (monorepo with pnpm)	48s
Tests (rollup-build)	57s
Tests (declarations-configuration)	35s
	18m 14s

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