allOf:
  - $ref: core-event-schema/room_event.yaml
description: |-
  Indicates a reaction to a previous event.

  Has no defined `content` properties of its own. Its only purpose is to hold an
  [`m.relates_to`](/client-server-api/#definition-mrelates_to) property.

  Since they contain no content other than `m.relates_to`, `m.reaction` events
  are normally not encrypted, as there would be no benefit in doing so.
type: object
properties:
  content:
    type: object
    properties:
      m.relates_to:
        description: |-
          Indicates the event being reacted to, and the type of reaction.
        type: object
        title: ReactionRelatesTo
        properties:
          rel_type:
            type: string
            enum: ["m.annotation"]
          event_id:
            type: string
            description: |-
              The event ID of the event that this is a reaction to.
            example: "$some_event_id"
          key:
            type: string
            description: |-
              The reaction being made, usually an emoji.

              If this is an emoji, it should include the unicode emoji
              presentation selector (`\uFE0F`) for codepoints which allow it
              (see the [emoji variation sequences
              list](https://www.unicode.org/Public/UCD/latest/ucd/emoji/emoji-variation-sequences.txt)).
            example: "👍"