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After upgrade to 7.2.0 mapTo(true) violates and shows @typescript-eslint/no-unsafe-argument error #6536

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vitalyiegorov opened this issue Jul 26, 2021 · 7 comments

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@vitalyiegorov
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Bug Report

We have migrated our codebase from 6.6.6 to 7.2.0 and have a an issue for mapTo(true) operator from eslint:

ESLint: Unsafe argument of type `OperatorFunction<any, boolean>` assigned to a parameter of type `OperatorFunction<DeleteResult, boolean>`.(@typescript-eslint/no-unsafe-argument)

Investigating the sources:

export function mapTo<R>(value: R): OperatorFunction<any, R>;
/** @deprecated Do not specify explicit type parameters. Signatures with type parameters that cannot be inferred will be removed in v8. */
export function mapTo<T, R>(value: R): OperatorFunction<T, R>;

Current Behavior
ESLint error is shown, without providing generics for mapTo operator.

Expected behavior
No ESLint errors, without additional generics for mapTo operator.

Reproduction

mapTo(true)

Environment

  • Runtime: Node v16.1.0
  • RxJS version: 7.2.0

Possible Solution
Seems like the problem is with any, changing the type to use generics, fixes the issue, and you can use it in your code without specifying them:

export declare function mapTo<T, R>(value: R): OperatorFunction<T, R>;
@cartant
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cartant commented Jul 28, 2021

T serves no purpose in the signature - as mentioned in the deprecation comment - and it would be incorrect to use it. (The general rule is that a type parameter should be used more than once in a signature.)

any could - indeed should - be replaced with unknown. Replacing the uses of any - throughout the API - with unknown is some that will be (eventually) be done.

@benlesh
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benlesh commented Aug 9, 2021

@cartant are we tracking the change for any to unknown anywhere? It seems like that's a version 8 thing. (Also we can probably close this)

@benlesh benlesh closed this as completed Aug 9, 2021
@cartant
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cartant commented Aug 9, 2021

@benlesh

... are we tracking the change for any to unknown anywhere?

Added it to #6367

@rassie
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rassie commented Dec 10, 2021

So what is the solution here, why is this closed? No matter which signature I'd use, I'll get an ESlint warning, either for deprecation or for unsafe arguments.

@manbearwiz
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Its clunky, but you can use a type assertion to specify the return type as unknown instead of any until they handle it internally. This removes the error for me. Replace

switchMapTo(this.service.isAlive())

with

switchMapTo(this.service.isAlive()) as OperatorFunction<unknown, boolean>

@benlesh
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benlesh commented Jan 5, 2022

Does map(() => true) work for you? (That's all that mapTo does internally)

@benlesh benlesh reopened this Jan 11, 2022
@lukket
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lukket commented Jul 14, 2022

Does map(() => true) work for you? (That's all that mapTo does internally)

Seems to work also for switchMapTo.

crapStone pushed a commit to Calciumdibromid/CaBr2 that referenced this issue Dec 23, 2022
This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [rxjs](https://rxjs.dev) ([source](https://github.com/reactivex/rxjs)) | dependencies | minor | [`7.5.7` -> `7.8.0`](https://renovatebot.com/diffs/npm/rxjs/7.5.7/7.8.0) |

---

### Release Notes

<details>
<summary>reactivex/rxjs</summary>

### [`v7.8.0`](https://github.com/reactivex/rxjs/blob/HEAD/CHANGELOG.md#&#8203;780-httpsgithubcomreactivexrxjscompare770780-2022-12-15)

[Compare Source](ReactiveX/rxjs@7.7.0...7.8.0)

##### Features

-   **buffer:** `closingNotifier` now supports any `ObservableInput` ([#&#8203;7073](ReactiveX/rxjs#7073)) ([61b877a](ReactiveX/rxjs@61b877a))
-   **delayWhen:** `delayWhen`'s `delayDurationSelector` now supports any `ObservableInput` ([#&#8203;7049](ReactiveX/rxjs#7049)) ([dfd95db](ReactiveX/rxjs@dfd95db))
-   **sequenceEqual:** `compareTo` now supports any `ObservableInput` ([#&#8203;7102](ReactiveX/rxjs#7102)) ([d501961](ReactiveX/rxjs@d501961))
-   **share:** `ShareConfig` factory properties now supports any `ObservableInput` ([#&#8203;7093](ReactiveX/rxjs#7093)) ([cc3995a](ReactiveX/rxjs@cc3995a))
-   **skipUntil:** `notifier` now supports any `ObservableInput` ([#&#8203;7091](ReactiveX/rxjs#7091)) ([60d6c40](ReactiveX/rxjs@60d6c40))
-   **window:** `windowBoundaries` now supports any `ObservableInput` ([#&#8203;7088](ReactiveX/rxjs#7088)) ([8c4347c](ReactiveX/rxjs@8c4347c))

### [`v7.7.0`](https://github.com/reactivex/rxjs/blob/HEAD/CHANGELOG.md#&#8203;770-httpsgithubcomreactivexrxjscompare760770-2022-12-15)

[Compare Source](ReactiveX/rxjs@7.6.0...7.7.0)

##### Features

-   **distinct:** `flush` argument now supports any `ObservableInput` ([#&#8203;7081](ReactiveX/rxjs#7081)) ([74c9ebd](ReactiveX/rxjs@74c9ebd))
-   **repeatWhen:** `notifier` supports `ObservableInput` ([#&#8203;7103](ReactiveX/rxjs#7103)) ([8f1b976](ReactiveX/rxjs@8f1b976))
-   **retryWhen:** `notifier` now supports any `ObservableInput` ([#&#8203;7105](ReactiveX/rxjs#7105)) ([794f806](ReactiveX/rxjs@794f806))
-   **sample:** `notifier` now supports any `ObservableInput` ([#&#8203;7104](ReactiveX/rxjs#7104)) ([b18c2eb](ReactiveX/rxjs@b18c2eb))

### [`v7.6.0`](https://github.com/reactivex/rxjs/blob/HEAD/CHANGELOG.md#&#8203;760-httpsgithubcomreactivexrxjscompare757760-2022-12-03)

[Compare Source](ReactiveX/rxjs@7.5.7...7.6.0)

##### Bug Fixes

-   **schedulers:** no longer cause TypeScript build failures when Node types aren't included ([c1a07b7](ReactiveX/rxjs@c1a07b7))
-   **types:** Improved subscribe and tap type overloads ([#&#8203;6718](ReactiveX/rxjs#6718)) ([af1a9f4](ReactiveX/rxjs@af1a9f4)), closes [#&#8203;6717](ReactiveX/rxjs#6717)

##### Features

-   **onErrorResumeNextWith:** renamed `onErrorResumeNext` and exported from the top level. (`onErrorResumeNext` operator is stil available, but deprecated) ([#&#8203;6755](ReactiveX/rxjs#6755)) ([51e3b2c](ReactiveX/rxjs@51e3b2c))

#### [7.5.7](ReactiveX/rxjs@7.5.6...7.5.7) (2022-09-25)

##### Bug Fixes

-   **schedulers:** improve performance of animationFrameScheduler and asapScheduler ([#&#8203;7059](ReactiveX/rxjs#7059)) ([c93aa60](ReactiveX/rxjs@c93aa60)), closes [#&#8203;7017](ReactiveX/rxjs#7017), related to [#&#8203;7018](ReactiveX/rxjs#7018) and [#&#8203;6674](ReactiveX/rxjs#6674)

##### Performance Improvements

-   **animationFrames:** uses fewer Subscription instances ([#&#8203;7060](ReactiveX/rxjs#7060)) ([2d57b38](ReactiveX/rxjs@2d57b38)), closes [#&#8203;7018](ReactiveX/rxjs#7018)

#### [7.5.6](ReactiveX/rxjs@7.5.5...7.5.6) (2022-07-11)

##### Bug Fixes

-   **share:** No longer results in a bad-state observable in an edge case where a synchronous source was shared and refCounted, and the result is subscribed to twice in a row synchronously. ([#&#8203;7005](ReactiveX/rxjs#7005)) ([5d4c1d9](ReactiveX/rxjs@5d4c1d9))
-   **share & connect:** `share` and `connect` no longer bundle scheduling code by default ([#&#8203;6873](ReactiveX/rxjs#6873)) ([9948dc2](ReactiveX/rxjs@9948dc2)), closes [#&#8203;6872](ReactiveX/rxjs#6872)
-   **exhaustAll:** Result will now complete properly when flattening all synchronous observables. ([#&#8203;6911](ReactiveX/rxjs#6911)) ([3c1c6b8](ReactiveX/rxjs@3c1c6b8)), closes [#&#8203;6910](ReactiveX/rxjs#6910)
-   **TypeScript:** Now compatible with TypeScript 4.6 type checks ([#&#8203;6895](ReactiveX/rxjs#6895)) ([fce9aa1](ReactiveX/rxjs@fce9aa1))

#### [7.5.5](ReactiveX/rxjs@7.5.4...7.5.5) (2022-03-08)

##### Bug Fixes

-   **package:** add types to exports ([#&#8203;6802](ReactiveX/rxjs#6802)) ([3750f75](ReactiveX/rxjs@3750f75))
-   **package:** add `require` export condition ([#&#8203;6821](ReactiveX/rxjs#6821)) ([c8955e4](ReactiveX/rxjs@c8955e4))
-   **timeout:** no longer will timeout when receiving the first value synchronously ([#&#8203;6865](ReactiveX/rxjs#6865)) ([2330c96](ReactiveX/rxjs@2330c96)), closes [#&#8203;6862](ReactiveX/rxjs#6862)

##### Performance Improvements

-   Don't clone observers unless you have to ([#&#8203;6842](ReactiveX/rxjs#6842)) ([3289d20](ReactiveX/rxjs@3289d20))

#### [7.5.4](ReactiveX/rxjs@7.5.3...7.5.4) (2022-02-09)

##### Performance Improvements

-   removed code that would `bind` functions passed with observers to `subscribe`. ([#&#8203;6815](ReactiveX/rxjs#6815)) ([fb375a0](ReactiveX/rxjs@fb375a0)), closes [#&#8203;6783](ReactiveX/rxjs#6783)

#### [7.5.3](ReactiveX/rxjs@7.5.2...7.5.3) (2022-02-08)

##### Bug Fixes

-   **subscribe:** allow interop with Monio and other libraries that patch function bind ([0ab91eb](ReactiveX/rxjs@0ab91eb)), closes [#&#8203;6783](ReactiveX/rxjs#6783)

#### [7.5.2](ReactiveX/rxjs@7.5.1...7.5.2) (2022-01-11)

##### Bug Fixes

-   operators that ignore input values now use `unknown` rather than `any`, which should resolve issues with eslint no-unsafe-argument ([#&#8203;6738](ReactiveX/rxjs#6738)) ([67cb317](ReactiveX/rxjs@67cb317)), closes [#&#8203;6536](ReactiveX/rxjs#6536)
-   **ajax:** crossDomain flag deprecated and properly reported to consumers ([#&#8203;6710](ReactiveX/rxjs#6710)) ([7fd0575](ReactiveX/rxjs@7fd0575)), closes [#&#8203;6663](ReactiveX/rxjs#6663)

#### [7.5.1](ReactiveX/rxjs@7.5.0...7.5.1) (2021-12-28)

##### Bug Fixes

-   export supporting interfaces from top-level `rxjs` site. ([#&#8203;6733](ReactiveX/rxjs#6733)) ([299a1e1](ReactiveX/rxjs@299a1e1))

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNC40OC4wIiwidXBkYXRlZEluVmVyIjoiMzQuNzAuNCJ9-->

Co-authored-by: cabr2-bot <cabr2.help@gmail.com>
Reviewed-on: https://codeberg.org/Calciumdibromid/CaBr2/pulls/1668
Reviewed-by: Epsilon_02 <epsilon_02@noreply.codeberg.org>
Co-authored-by: Calciumdibromid Bot <cabr2_bot@noreply.codeberg.org>
Co-committed-by: Calciumdibromid Bot <cabr2_bot@noreply.codeberg.org>
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