Enable strictNullChecks #3791
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Enable strictNullChecks #3791
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We enable
strictNullChecksto enable type safety and also make method return types includenullvalues. Before this PR, methods like() => document.getElementById('myid')will have a return type ofElementinstead ofElement | null.This PR doesn't try to fix all typing errors for simplicity, instead, it fixed some of them, especially ones related to return types.