Symbol properties rendered as strings

Search terms

Symbol property, computed property name, string

Expected Behavior

Render computed properties in some way that looks like TypeScript syntax.

Actual Behavior

Renders computed properties as string literals in signatures, both at the type level and member level:

interface Arrayish<T> {
    "[iterator]"(): IterableIterator<T>;
    length: number;
    slice: (start?: number, end?: number) => Arrayish<T>;
    readonly [index: number]: T;
}

Steps to reproduce the bug

Run TypeDoc on this code:

export interface Arrayish<T> {
  readonly [index: number]: T;
  readonly length: number;
  [Symbol.iterator](): IterableIterator<T>;
  slice: (start?: number, end?: number) => Arrayish<T>;
}

Environment

• Typedoc version: 0.28.13
• TypeScript version: 5.9.2
• Node.js version: v22.18.0
• OS: macOS 14.6.1

Start by running TypeDoc 0.28.13 on the reproduced Arrayish interface with TypeScript 5.9.2 and inspect how its generated signature renders the computed Symbol.iterator property. Done means computed properties no longer appear as quoted string literals and instead resemble valid TypeScript syntax at both type and member levels.