Automatic Type Acquisition

Automatic Type Acquisition is the term for how TypeScript grabs type definitions from @types on npm behind the scenes to provide a better user experience for JavaScript users. The playground now has a similar (but a bit more limited) version of the type acquisition process built into TypeScript. You can use it by creating imports in your code. It works either through @types from DefinitelyTyped or via d.ts files inside the dependency itself. 

import { danger } from "danger";
// Highlight these identifiers below to see the associated JSDocs from the built-in types: 
danger.github;
// This handles transitive dependencies also, so in this case, danger depends on @octokit/rest also. 
danger.github.api.pulls.createComment();
// Type acquisition will also take Node's built-in modules into account and pull in Node's type declarations when you use any of those dependencies. Note, these tend to take a bit longer than the others since there's quite a lot of types to download! 
import { readFileSync } from "fs";

const inputPath = "my/path/file.ts";
readFileSync(inputPath, "utf8");