Web Reference: When strictNullChecks is true, null and undefined have their own distinct types and you’ll get a type error if you try to use them where a concrete value is expected. TypeScript has a powerful system to deal with null or undefined values. By default null and undefined handling is disabled, and can be enabled by setting strictNullChecks to true. The rest of this page applies for when strictNullChecks is enabled. Dec 12, 2018 · In strict null checking mode, the null and undefined values are not in the domain of every type and are only assignable to themselves and any (the one exception being that undefined is also assignable to void). Ensure non-undefined class properties are initialized in the constructor.
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