[SOLVED] TypeError: Promise.withResolvers is not a function | NestJS | Page 1

upper echo Mar 13, 2024, 8:20 PM

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Hello!
What settings I have to add in tsconfig.json to allow Promise.withResolvers at runtime?
typescript package version is 5.4 so it's available in the TypeScript side.

Info will be appreciated.

warm pagoda Mar 14, 2024, 9:27 AM

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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/withResolvers#browser_compatibility
You can see Node.js doesn't have support for that (yet).

MDN Web Docs

Promise.withResolvers() - JavaScript | MDN

The Promise.withResolvers() static method returns an object containing a new Promise object and two functions to resolve or reject it, corresponding to the two parameters passed to the executor of the Promise() constructor.

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It might not be coming anytime soon, given that it's Stage 2 Draft (https://tc39.es/proposal-promise-with-resolvers/#sec-promise.withResolvers).
https://tc39.es/process-document/

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So, to your tsconfig you should add (under compilerOptions):

    "lib": ["ES2022"],
    "target": "es2022",

Which should put typescript in line with what Node.js 18+ supports.

upper echo Mar 16, 2024, 9:22 PM

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Thank you a lot!!!

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[SOLVED] TypeError: Promise.withResolvers is not a function

upper echo Mar 16, 2024, 11:53 PM

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It might not be coming anytime soon, given that it's Stage 2 Draft

Stage 4*

warm pagoda Mar 19, 2024, 11:07 AM

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Hmm, I guess the original (ecma262) proposal wasn't good enough, so they made a new separate proposal?

#[SOLVED] TypeError: Promise.withResolvers is not a function