The -D flag is the shortcut for: --save-dev. Source: https://docs.npmjs.com/cli/install

The -D flag is the shortcut for: --save-dev. Source: https://docs.npmjs.com/cli/install

-D, --save-dev: Package will appear in your devDependencies.

The -D flag is the shortcut for: --save-dev. Source: https://www.npmjs.org/doc/misc/npm-config.html

The -D flag is the shortcut for: --save-dev. Source: https://docs.npmjs.com/cli/install