Update dependency is-promise to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
is-promise	^2.1.0 -> ^4.0.0

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Release Notes

then/is-promise

v4.0.0

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Breaking Changes

• Use PromiseLike instead of Promise in TypeScript (#​40)

  This is only a breaking change for TypeScript users.

  In the following code:

  function foo(x: PromiseLike<string> | string) {
    if (isPromise(x)) {
      return x;
    } else {
      return Promise.resolve(x);
    }
  }

  TypeScript would previously have incorrectly inferred foo as returning Promisestring>when in fact it returnsPromiseLikestring>. The latest version fixes this. If you instead had the following code, it should work exactly the same as before:

  function foo(x: Promise<string> | string) {
    if (isPromise(x)) {
      return x;
    } else {
      return Promise.resolve(x);
    }
  }

  This update is to reflect the fact that is-promise does "duck" typing, rather than an instanceof check.

v3.0.0

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Breaking Changes

• Restricted "exports" in package.json (for node 14+) (#​30)

  The only ways to import this are now:

  import isPromise from 'is-promise';

  or

  const isPromise = require('is-promise');

  If you were requiring things like the package.json file within the package, these are not part of the public API, and will no longer be accessible.

• is-promise now uses "default" exports in ES Modules environments (#​30)

  If you were using ES6 style imports via

  import * as isPromise from 'is-promise';

  you will need to update this to

  import isPromise from 'is-promise';

  If you were using CommonJS style require, no change is needed.

• This package now comes bundled with TypeScript definitions (#​31)

  This means you may get new errors that you didn't see before if you are using TypeScript. If you are not using TypeScript, this change will not impact you.

v2.2.2

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Removed ESM support that was added in 2.2.0 as it turns out to be a breaking change (see https://github.com/then/is-promise/issues/20)

v2.2.1

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Attempted to fix ESM, but this is still broken for people who import the package.json file.

v2.2.0

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• Adds TypeScript definition
• Adds support for ES Module style default import

This version of is-promse is broken. Please use 2.2.2

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