TypeScript · Compiler and project settings

strict

Turns on the strict family, including strictNullChecks and noImplicitAny. Enable it on every new project.

Syntax

"strict": true

Example

// tsconfig.json
{
  "compilerOptions": {
    "strict": true
  }
}

The single highest-value compiler flag. It prevents whole classes of null and implicit any bugs.

Reference pages are the quick answer. The course explains the why, shows the full example and ends with a challenge.