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fix(@angular/build): conditionally declare tslib in built library pac… #3622

Job	Run time
build	26s
build-e2e-windows	26s
lint	1m 52s
Browser Compatibility Tests	0s
test	0s
publish-snapshots	0s
e2e-snapshots	0s
e2e	0s
e2e-package-managers	-1s
e2e-windows	0s
	2m 43s