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heroboy opened this issue Nov 16, 2020 · 3 comments
Open

Compile error if I named last array destructuring element. #41548

heroboy opened this issue Nov 16, 2020 · 3 comments
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Bug A bug in TypeScript Has Repro This issue has compiler-backed repros: https://aka.ms/ts-repros
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@heroboy
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heroboy commented Nov 16, 2020 •
edited by orta
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TypeScript Version: v4.0.5

Search Terms: destructuring assignment , Object literal may only specify known properties

Code

declare function foo<T extends { dataType: 'a' | 'b'; }>(template: T): [T, any, any]; //<-- there no error, when it is [any,any,any]
declare function bar<T extends { dataType: 'a' | 'b'; }>(template: T): [T, any];

function test_foo() {

  const [, ,] = foo({ dataType: 'a', day: 0 });
  const [x, y, z] = foo({ dataType: 'a', day: 0 });
  const [, , t] = foo({ dataType: 'a', day: 0 }); //<-- red line under the `day`
  console.log(x, y, z, t);
}

function test_bar() {

  const [,] = bar({ dataType: 'a', day: 0 });
  const [x, y] = bar({ dataType: 'a', day: 0 });
  const [, z] = bar({ dataType: 'a', day: 0 });//<-- red line under the `day`
  console.log(x, y, z);
}

Expected behavior:
no compile error
Actual behavior:

    Argument of type '{ dataType: "a"; day: number; }' is not assignable to parameter of type '{ dataType: "a" | "b"; }'. Object literal may only specify known properties, and 'day' does not exist in type '{ dataType: "a" | "b"; }'.

**Playground Link:
link

Related Issues:

@RyanCavanaugh RyanCavanaugh added the Bug A bug in TypeScript label Nov 16, 2020
@RyanCavanaugh RyanCavanaugh added this to the Backlog milestone Nov 16, 2020
@typescript-bot typescript-bot added the Has Repro This issue has compiler-backed repros: https://aka.ms/ts-repros label Nov 19, 2020
@theGreen233
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Hello, we are a group of researchers developing machine learning techniques to locate issues suitable for newcomers, and our model consider this issue as likely a "good first issue". May we recommend you to label it as "good first issue" so newcomers know where to choose?

Thank you!

@andrewbranch
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This is not a good first issue

@typescript-bot
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typescript-bot commented Apr 13, 2022 •
edited
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👋 Hi, I'm the Repro bot. I can help narrow down and track compiler bugs across releases! This comment reflects the current state of the repro in the issue body running against the nightly TypeScript.

Issue body code block by @heroboy

❌ Failed: -

  • Object literal may only specify known properties, and 'day' does not exist in type '{ dataType: "a" | "b"; }'.
  • Object literal may only specify known properties, and 'day' does not exist in type '{ dataType: "a" | "b"; }'.

Historical Information
Version Reproduction Outputs
4.2.2, 4.3.2, 4.4.2, 4.5.2, 4.6.2

❌ Failed: -

  • Argument of type '{ dataType: "a"; day: number; }' is not assignable to parameter of type '{ dataType: "a" | "b"; }'. Object literal may only specify known properties, and 'day' does not exist in type '{ dataType: "a" | "b"; }'.
  • Argument of type '{ dataType: "a"; day: number; }' is not assignable to parameter of type '{ dataType: "a" | "b"; }'. Object literal may only specify known properties, and 'day' does not exist in type '{ dataType: "a" | "b"; }'.

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