Property 'finally' does not exist on type 'Promise<void>'

For TypeScript 3.3.3, just add es2018.promise to your tsconfig.json - compilerOptions.lib config like this:

"lib": ["es2015", "es2016", "dom", "es2018.promise"]

If you use vscode, maybe you should reload window after adding this option to your tsconfig.json file

ES2018 support was not added until TypeScript 2.7. Upgrading to that version or later resolves this error.

While TypeScript 2.7 might support it you need to target: "ESNEXT" in your tsconfig.json.

Which means that your code will probably not run in older browsers or node.js versions.

I'm using:

"@types/promise.prototype.finally": "^2.0.2"

import { shim as finallyShim } from 'promise.prototype.finally'; 
finallyShim();