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Misleading error for a generic parameter with a default involving <code>this</code>

Domain: This-TypingThe issue relates to providing types to thisThe issue relates to providing types to this

Help WantedYou can do thisYou can do this

Possible ImprovementThe current behavior isn't wrong, but it's possible to see that it might be better in some casesThe current behavior isn't wrong, but it's possible to see that it might be better in some cases

Status: Open.

#61812 In microsoft/TypeScript;

· LukeAbby opened on Jun 4, 2025

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Backlog

<code>asserts this is T</code> does not narrow type of <code>this</code>

Cursed?It's likely this is extremely difficult to fix without making something else much, much worseIt's likely this is extremely difficult to fix without making something else much, much worse

Domain: This-TypingThe issue relates to providing types to thisThe issue relates to providing types to this

Possible ImprovementThe current behavior isn't wrong, but it's possible to see that it might be better in some casesThe current behavior isn't wrong, but it's possible to see that it might be better in some cases

Status: Open.

#60140 In microsoft/TypeScript;

· OmarTawfik opened on Oct 4, 2024

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Backlog

Unions of assertion functions do not act as assertion functions

BugA bug in TypeScriptA bug in TypeScript

Domain: This-TypingThe issue relates to providing types to thisThe issue relates to providing types to this

Help WantedYou can do thisYou can do this

Status: Open.

#59707 In microsoft/TypeScript;

· AlexPaven opened on Aug 21, 2024

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Backlog

Naked generic type returned from iterator method

BugA bug in TypeScriptA bug in TypeScript

Domain: This-TypingThe issue relates to providing types to thisThe issue relates to providing types to this

Status: Open.

#59161 In microsoft/TypeScript;

· reverofevil opened on Jul 7, 2024

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TypeScript 5.6.0

TypeScript cannot always infer the correct type through a user-defined type guard using the 'is' operator.

BugA bug in TypeScriptA bug in TypeScript

Domain: This-TypingThe issue relates to providing types to thisThe issue relates to providing types to this

Help WantedYou can do thisYou can do this

Status: Open.

#57189 In microsoft/TypeScript;

· KMakowsky opened on Jan 26, 2024

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Backlog

Weak type not rejected when intersected with <code>ThisType</code>

BugA bug in TypeScriptA bug in TypeScript

Domain: This-TypingThe issue relates to providing types to thisThe issue relates to providing types to this

Help WantedYou can do thisYou can do this

Status: Open.

#56995 In microsoft/TypeScript;

· NWYLZW opened on Jan 9, 2024

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Backlog

<code>this</code> parameter not correctly inferred when unrelated type parameter has no inference candidates

BugA bug in TypeScriptA bug in TypeScript

Domain: This-TypingThe issue relates to providing types to thisThe issue relates to providing types to this

Help WantedYou can do thisYou can do this

Status: Open.

#56024 In microsoft/TypeScript;

· theajack opened on Oct 8, 2023

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Backlog

Issue with 'this' Parameter and JSX Component Generics

BugA bug in TypeScriptA bug in TypeScript

Domain: This-TypingThe issue relates to providing types to thisThe issue relates to providing types to this

RescheduledThis issue was previously scheduled to an earlier milestoneThis issue was previously scheduled to an earlier milestone

Status: Open.

#55431 In microsoft/TypeScript;

· rosostolato opened on Aug 18, 2023

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TypeScript 5.7.0

Type narrowing of <code>super</code> when using <code>this</code>

BugA bug in TypeScriptA bug in TypeScript

Domain: This-TypingThe issue relates to providing types to thisThe issue relates to providing types to this

Status: Open.

#55155 In microsoft/TypeScript;

· jrandolf-google opened on Jul 25, 2023

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Backlog

'this' implicitly has type 'any' in a function used within a conditional expression

BugA bug in TypeScriptA bug in TypeScript

Domain: This-TypingThe issue relates to providing types to thisThe issue relates to providing types to this

Help WantedYou can do thisYou can do this

Status: Open.

#54723 In microsoft/TypeScript;

· Andarist opened on Jun 21, 2023

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Backlog

ES6 Class: <code>asserts this is Type</code> raises error when variable containing instance is type narrowed

Domain: This-TypingThe issue relates to providing types to thisThe issue relates to providing types to this

Help WantedYou can do thisYou can do this

Possible ImprovementThe current behavior isn't wrong, but it's possible to see that it might be better in some casesThe current behavior isn't wrong, but it's possible to see that it might be better in some cases

Status: Open.

#54591 In microsoft/TypeScript;

· protango opened on Jun 9, 2023

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Backlog

Type Guards are no longer working correctly all the time

Domain: This-TypingThe issue relates to providing types to thisThe issue relates to providing types to this

Possible ImprovementThe current behavior isn't wrong, but it's possible to see that it might be better in some casesThe current behavior isn't wrong, but it's possible to see that it might be better in some cases

Status: Open.

#54178 In microsoft/TypeScript;

· MaksiRose opened on May 8, 2023

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Backlog