Issues

• v2 roadmap: breaking changes

  sveltejs/acorn-typescript#170 · Filter by author baseballyama opened on Oct 16, 2026

• A module specifier that isn't a string, or a missing one, fails with Unexpected token instead of TypeScript's TS1141 or TS1109

  sveltejs/acorn-typescript#167 · Filter by author leonidaz opened on Oct 4, 2026

• import type "m" parses as a type-only import, and import type from from "m" fails to parse

  sveltejs/acorn-typescript#166 · Filter by author leonidaz opened on Oct 4, 2026

• A missing from, = or namespace in an import or export fails with Unexpected token instead of TypeScript's '…' expected.

  sveltejs/acorn-typescript#165 · Filter by author leonidaz opened on Oct 4, 2026

• TSEnumDeclaration: add a body (TSEnumBody), as typescript-estree has

  sveltejs/acorn-typescript#158 · Filter by author leonidaz opened on Sep 27, 2026

• A type assertion in a for await head fails to parse

  sveltejs/acorn-typescript#157 · Filter by author leonidaz opened on Sep 26, 2026

• export default @dec declare class A {} fails to parse

  sveltejs/acorn-typescript#156 · Filter by author leonidaz opened on Sep 26, 2026

• A class member modifier, or a repeated or misplaced modifier, before a declaration fails to parse

  sveltejs/acorn-typescript#155 · Filter by author leonidaz opened on Sep 26, 2026
  1

• type written with an escape in an import declaration or specifier fails to parse

  sveltejs/acorn-typescript#154 · Filter by author leonidaz opened on Sep 26, 2026

• Import attributes in an import type fail to parse, and must be { with: … } or { assert: … }

  sveltejs/acorn-typescript#153 · Filter by author leonidaz opened on Sep 26, 2026

• type T = intrinsic is read as a type name, and type T = interface as the intrinsic keyword

  sveltejs/acorn-typescript#152 · Filter by author leonidaz opened on Sep 26, 2026

• A TypeScript word in parentheses at the start of a statement is read as the keyword

  sveltejs/acorn-typescript#151 · Filter by author leonidaz opened on Sep 26, 2026

• An async arrow function's rest parameter ends before its type annotation

  sveltejs/acorn-typescript#150 · Filter by author leonidaz opened on Sep 26, 2026

• A type annotation or ? in parentheses or call arguments is accepted when no => follows

  sveltejs/acorn-typescript#149 · Filter by author leonidaz opened on Sep 26, 2026

• A type assertion in a for…in or for…of head is rejected

  sveltejs/acorn-typescript#148 · Filter by author leonidaz opened on Sep 26, 2026

• A TypeScript keyword written with an escape is read as the keyword without an error

  sveltejs/acorn-typescript#147 · Filter by author leonidaz opened on Sep 26, 2026

• A type alias named as or satisfies fails to parse, and export type as = … parses

  sveltejs/acorn-typescript#145 · Filter by author leonidaz opened on Sep 26, 2026

• export default interface followed by a line break fails to parse

  sveltejs/acorn-typescript#144 · Filter by author leonidaz opened on Sep 26, 2026

• abstract before a declaration other than a class is accepted without an error or fails with Unexpected token, and abstract declare class fails

  sveltejs/acorn-typescript#143 · Filter by author leonidaz opened on Sep 26, 2026
  1

• A type assertion in an arrow function's parameters is accepted

  sveltejs/acorn-typescript#142 · Filter by author leonidaz opened on Sep 25, 2026

• A syntax error in a generic arrow function is reported at its type parameters with jsx

  sveltejs/acorn-typescript#141 · Filter by author leonidaz opened on Sep 25, 2026

• An async arrow function's optional rest parameter fails to parse

  sveltejs/acorn-typescript#140 · Filter by author leonidaz opened on Sep 25, 2026
  1

• A parameter property modifier before a function type's first parameter makes it a parenthesized type

  sveltejs/acorn-typescript#139 · Filter by author leonidaz opened on Sep 25, 2026

• A parameter property whose binding pattern has a default isn't rejected

  sveltejs/acorn-typescript#138 · Filter by author leonidaz opened on Sep 25, 2026

• abstract or declare followed by a line break is read as a modifier after export, export default or decorators

  sveltejs/acorn-typescript#137 · Filter by author leonidaz opened on Sep 25, 2026