Strict mode catches more bugs at compile time. Here's how to use it effectively.
Enabling Strict Mode#
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strictNullChecks#
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noImplicitAny#
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strictFunctionTypes#
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strictBindCallApply#
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strictPropertyInitialization#
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noImplicitThis#
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useUnknownInCatchVariables#
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Migrating to Strict Mode#
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Best Practices#
Migration:
✓ Enable flags incrementally
✓ Fix one file at a time
✓ Use // @ts-expect-error for known issues
✓ Add tests before migrating
Patterns:
✓ Use type guards for narrowing
✓ Prefer unknown over any
✓ Initialize class properties
✓ Handle null/undefined explicitly
Avoid:
✗ Using ! assertion excessively
✗ Casting to any to silence errors
✗ Disabling rules per-file
✗ Ignoring compiler warnings
Conclusion#
Strict mode catches bugs that would otherwise appear at runtime. Enable it for new projects and migrate existing ones gradually. The initial investment in fixing errors pays off with more reliable code and better developer experience through improved editor support.