Is TypeScript a dependency or devDependency?

Does typescript need to be a dependency?

typescript , on the other hand, packages its declaration files, so there was no need for any additional dependencies. Our package exposes declarations from each of those, so any user of our browserify-typescript-extension package needs to have these dependencies as well.

Are typescript types a dev dependency?

Item 45: Put TypeScript and @types in devDependencies

npm draws a distinction between a few types of dependencies, each of which goes in a separate section of package. … When you publish your code on npm and another user installs it, it will also install these dependencies. (These are known as transitive dependencies.)

What is the difference between dependency and devDependency?

“dependencies” : Packages required by your application in production. “devDependencies” : Packages that are only needed for local development and testing.

Which modules are considered as devDependency in react project?

For example, modules that are imported by your front-end application and the frameworks themselves (such as React, Angular, Vue, Svelte, etc), would all go in the package. json file as dependencies. The bundlers, pre-processors, transpilers, etc, instead, would go in as devDependencies.

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What are the 3 types of dependencies?

There are three kinds of dependencies with respect to the reason for the existence of dependency:

  • Causal (logical) It is impossible to edit a text before it is written. …
  • Resource constraints. It is logically possible to paint four walls in a room simultaneously but there is only one painter.
  • Discretionary (preferential)

What is [] in TypeScript?

TypeScript, like JavaScript, allows you to work with arrays of values. Array types can be written in one of two ways. In the first, you use the type of the elements followed by [] to denote an array of that element type: let list : number[] = [1, 2, 3];

When should a dev dependency be installed?

When you add the -D flag, or –save-dev , you are installing it as a development dependency, which adds it to the devDependencies list. Development dependencies are intended as development-only packages, that are unneeded in production. For example testing packages, webpack or Babel.

How do I run TypeScript locally?

There are three ways to install TypeScript:

  1. Install TypeScript as an NPM package on your local machine or in your project.
  2. Install TypeScript NuGet Package in your . NET or . NET Core project.
  3. Install TypeScript as a Plug-in in your IDE (Integrated Development Environment).

Is Dotenv a dev dependency?

dotenv is a dev dependency.

Why do we not use — save with npm install anymore?

Packages installed without —save are not considered as dependencies and are kept separate. You can detect them easily as extraneous packages with npm ls and remove them instantly with npm prune . Now if you think extraneous packages are a bad thing, you can of course use –save everytime you install a new package.


What does peer dependency mean?

Having a peer dependency means that your package needs a dependency that is the same exact dependency as the person installing your package. This is useful for packages like react that need to have a single copy of react-dom that is also used by the person installing it.

Why is json package lock needed?

The goal of package-lock. json file is to keep track of the exact version of every package that is installed so that a product is 100% reproducible in the same way even if packages are updated by their maintainers.

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