TypeScript's Built-In Type Declarations with the `--lib` Compiler Option

Since version 2.0, the built-in standard library type declarations have been split into modules in TypeScript. This allows to select which (of those built-in) declarations to include in the project.

There are several groups which can be defined with the --lib compiler option (or via the lib property in tsconfig.json):

dom
webworker
es5
es6 / es2015
es2015.core
es2015.collection
es2015.iterable
es2015.promise
es2015.proxy
es2015.reflect
es2015.generator
es2015.symbol
es2015.symbol.wellknown
es2016
es2016.array.include
es2017
es2017.object
es2017.sharedmemory
scripthost

By default, if not set explicitly, TypeScript will include type declarations needed for web development, depending on the target:

for ES5 as target: dom, es5 and scripthost
for ES6 as target: dom, dom.iterable, es6 and scripthost