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Runtime-safe type casts and checks for TypeScript.

Status: Open.

#63532 In microsoft/TypeScript;

· matthiasrieger opened on Jun 4, 2026

Markdown heading level bug in Narrowing documentation

Status: Open.

#63531 In microsoft/TypeScript;

· mzleman opened on Jun 4, 2026

erasableSyntaxOnly should error on unerasable as/satisfies

Needs InvestigationThis issue needs a team member to investigate its status.This issue needs a team member to investigate its status.

Status: Open.

#63527 In microsoft/TypeScript;

· robpalme opened on Jun 2, 2026

tsc may fail to report error when file.js & file.d.ts coexist, even when @ts-check is added on file.js.

Working as IntendedThe behavior described is the intended behavior; this is not a bugThe behavior described is the intended behavior; this is not a bug

Status: Open.

#63523 In microsoft/TypeScript;

· hkleungai opened on Jun 1, 2026

Declarations that shadow global Symbol break emit for using declarations

BugA bug in TypeScriptA bug in TypeScript

Domain: JS EmitThe issue relates to the emission of JavaScriptThe issue relates to the emission of JavaScript

Status: Open.

#63522 In microsoft/TypeScript;

· DanielRosenwasser opened on Jun 1, 2026

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Backlog

Reassigning of inferred object with Indexed access value does not widen it's type

Not a DefectThis behavior is one of several equally-correct optionsThis behavior is one of several equally-correct options

Status: Open.

#63514 In microsoft/TypeScript;

· svenvandescheur opened on May 29, 2026

Font bug

Needs More InfoThe issue still hasn't been fully clarifiedThe issue still hasn't been fully clarified

Status: Open.

#63507 In microsoft/TypeScript;

· Liam1-dev opened on May 26, 2026

Wildcard package.json exports auto-import path does not apply traversal containment checks

BugA bug in TypeScriptA bug in TypeScript

Domain: LS: Auto-import

Status: Open.

#63499 In microsoft/TypeScript;

· zainnadeem786 opened on May 22, 2026

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Backlog

js/ts.preferences.autoImportFileExcludePatterns is not reflected promptly in IntelliSense suggestions

Needs InvestigationThis issue needs a team member to investigate its status.This issue needs a team member to investigate its status.

Status: Open.

#63498 In microsoft/TypeScript;

· heroboy opened on May 21, 2026

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Backlog

DOM: Element#matches() incorrectly narrows types

Domain: lib.d.tsThe issue relates to the different libraries shipped with TypeScriptThe issue relates to the different libraries shipped with TypeScript

Help WantedYou can do thisYou can do this

Status: Open.

#63497 In microsoft/TypeScript;

· Derugon opened on May 20, 2026

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Backlog

ReadonlySet lacks documentation for has, forEach and size

Domain: lib.d.tsThe issue relates to the different libraries shipped with TypeScriptThe issue relates to the different libraries shipped with TypeScript

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.

#63481 In microsoft/TypeScript;

· Bertie690 opened on May 15, 2026

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Backlog

default keyword is offered in expression-bodied arrow function completions

BugA bug in TypeScriptA bug in TypeScript

Domain: LS: Completion ListsThe issue relates to showing completion lists in an editorThe issue relates to showing completion lists in an editor

Status: Open.

#63463 In microsoft/TypeScript;

· DhineshPonnarasan opened on May 9, 2026

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Backlog