Mastering TypeScript - Fourth Edition

8

Strict Compiler Options

The TypeScript compiler uses the tsconfig.json file to specify a number of compilation options. These options include what version of JavaScript we would like to generate for, what the output directory should be, and whether or not to allow JavaScript source files within the project directory. We have already discussed a few of these compiler options on our journey with TypeScript so far.

One of the most important options is simply named strict, and this single option turns on a group of other compiler options. The purpose of the strict compiler options is to apply a number of checks to our code and determine whether any of these checks fail. As an example, these strict options can determine if a variable could be undefined ...