Enabling "strict": true activates strict type checking compiler options:

• noImplicitAny: Raises errors on expressions inferred as any.
• strictNullChecks: Ensures null and undefined are not assignable to other types unless explicitly unioned.
• strictFunctionTypes: Enforces contravariant parameter checking on function signatures.
• strictBindCallApply: Enforces strict type matching on .bind(), .call(), and .apply().
• strictPropertyInitialization: Ensures class properties are initialized in the constructor.