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Special TSDoc tags

The jsii compiler interprets some documentation tags as hints that influence the type system represented in the .jsii assembly files.

Forcing an interface to be considered a struct

Using the @struct tag, an interface will be interpreted as a struct even if its name starts with a capital I, followed by another capital letter (which normally would make them be treated as behavioral interfaces):

 * @struct
export interface IPRange {
  readonly cidr: string:


The @struct hint can only be used on interface declarations. Attempting to use them on any other declaration will result in a compilation error.

Excluding a declaration from multi-language support

The @jsii ignore tag causes the documented declaration to be ignored by the jsii compiler. This has the effect of making the declaration invisible to languages other than TypeScript and Javascript. Developers using this tag should consider the implications on the usability of their library in other languages.

export interface Props {
  public readonly name: string;

   * TypeScript/Javascript customers may pass additional properties with this
   * struct, however this will not be possible in other languages, as jsii does
   * not support index signatures.
   * @jsii ignore
  public readonly [key: string]: unknown;

Last update: 2023-09-25