Does npx use yarn?

Question

Today I created a reactjs starting template with CRA using:

npx create-react-app my-app --template redux 

This created two files in my project: package.json and yarn.lock.

I am confused about why it worked after I cd in the project and ran yarn start even though I didn't initiate the project with yarn create react-app my-app.

I have two questions:

• Why it generated yarn.lock?
• What is the difference between
  • npx create-react-app my-app --template redux and
  • yarn create react-app my-app --template redux considering that they have the same effect.

Answer 1

npx create-react-app executes create-react-app binary, and create-react-app uses yarn to create your project (if yarn is installed). that's why you can see yarn.lock and also why yarn-start works.

Difference between npx create-react-app and yarn create react-app

They both executes create-react-app binary. create-react-app is the one who decides whether it wants to create the project with yarn or not. to use npm in create-react-app, use --use-npm flag (no matter you execute create-react-app with npx or yarn or directly, you should set it if you want it to use npm .):

create-react-app my-project --use-npm