Strict mode in TypeScript turns on 8 safety checks at once with one line: "strict": true in your tsconfig.json. It catches null errors, missing types, uninitialized class properties, and more before your code ever runs. Always enable it on new projects. On older projects, turn on the 8 flags one at a time and fix errors as you go.
What is Strict Mode in TypeScript?
By default, TypeScript is pretty relaxed. It lets you skip types in some places. It does not check for null on every value. It allows some patterns that can crash at runtime.
Strict mode fixes all of that. It is a single switch that turns on a group of type-checking rules all at once.
Think of it like turning on every warning light in a car instead of just the engine light. You see more problems, but that means you fix them before they cause a crash.
