How to check TypeScript code for syntax errors from a command line?

Question

I have a code that generates TypeScript classes, and as a build/test step, I would like to check the generated files for syntax correctness.

I have looked at TypeScript compiler options but see no such option.

• How can I check the syntax?

I don't want a full compilation because the referred types are not reachable at that build step (they are in a different module to which the generated sources are added later).

Answer 1

The tsc --noEmit is what you're searching.

Do not emit compiler output files like JavaScript source code, source-maps or declarations.

source TSDocs

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If you want lint code as well as check types on CI use tsc --noEmit && eslint

source Stackoverflow comment

Answer 2

First install ESLint (you need npm installed in your system):

npm i -g eslint

Execute ESLint to check files:

eslint file1.ts file2.ts

or:

eslint lib/**

ESLint supports a lot of options for more advanced case uses, check the docs.

Answer 3

If its just syntax checking you are after then you can use a linter like tslint which can be run from the command line or via many build tools