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

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I am trying to use the finally method on a promise but I keep getting this error.

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

I have looked up similar questions to this which have suggested adding "es2018.promise" to the "lib" array in tsconfig.js. This then produces the following error:

typescript error
        Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'esnext', 'dom',
        'dom.iterable', 'webworker', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator',
        'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol',
        'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string',
        'es2017.intl', 'esnext.asynciterable'.

Any help resolving this is greatly appreciated!

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

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

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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();

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I fixed this by using this as it seems to be an issue with ionic not typescript. I imagine it will be fixed in the near future.

Thanks to everyone who helped me with this.

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Make sure you yarn/npm install first, the error disappears after installation if you already have the es2018.promise in tsconfig.json.

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PROPERTY, property definition: 1. an object or objects that belong to someone: 2. a building or area of land, or both together…. Learn more. THE PROPERTY APPRAISER DOES NOT SEND TAX BILLS. THE PROPERTY APPRAISER DOES NOT SET OR COLLECT TAXES. Contact the Tax Collector directly: or at 954-831-4000. The COUNTY TAX COLLECTOR (note: NOT part of our office) mailed the 2019 tax bills during the first week of November. These tax bills would have become delinquent if not

  • Just tested on stack itself, it works. Consider providing a minimal reproducible example reproducing the issue.
  • What version of TypeScript are you using? Support for ES2018 wasn't added until 2.7:
  • Just checked and its 2.6.2, I will update and check it's resolved.
  • Thank you! This has resolved it!
  • If you are getting a runtime error on the finally call, then the promise implementation in your runtime environment does not support finally. There's nothing TypeScript can do about that. You can try installing this polyfill.
  • I ran into this out of the blue. I didn't update anything for ages and I've been compiling a lot with no errors... Then suddenly this "finally" error today. I am using version 3.2.4. Just added es2018 to tsconfig.json and everything works again. Seems strange. But why es2018.promise and not just es2018?
  • @Jette es2018 contains ES2018.Intl, ES2018.Promise and ES2018.RegExp. So if you just need finally feature, just add es2018.promise to lib.
  • Does it make sense to include several versions of ES (2015 and 2016 in your case)? I understand that you need at least one "full" library but I'm not sure why you'd want two. I am using ["DOM", "es2017", "es2018.promise"] and it's working for me.
  • In TypeScript 2.7, you have to add "esnext.promise" instead of "es2018.promise"
  • I added esnext and only then it works.I'm on typescript-2.7. With typescript-2.7 it doesnt work with es2018. Will this support old browsers?
  • With old browsers you usually need polyfills.