In TypeScript 4.5, lib files can be overriden by npm modules, find out more in the blog. You have polyfills or native implementations for some, but not all, of a higher level ECMAScript version.Your runtime platform provides certain JavaScript API objects (maybe through polyfills), but doesn’t yet support the full syntax of a given ECMAScript version.Your program doesn’t run in a browser, so you don’t want the "dom" type definitions.You may want to change these for a few reasons: TypeScript also includes APIs for newer JS features matching the target you specify for example the definition for Map is available if target is ES6 or newer. TypeScript includes a default set of type definitions for built-in JS APIs (like Math), as well as type definitions for things found in browser environments (like document).
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