Enum ReactionChange 

#[non_exhaustive]
pub enum ReactionChange<'a> {
    Add {
        sender_reaction_id: &'a str,
        emoji: &'a str,
        sent_at: &'a UTCDate,
    },
    Remove {
        sender_reaction_id: &'a str,
    },
}

A single reaction change in a Message/set patch (JMAP Chat §4.5).

The patch key is reactions/<senderReactionId> (JSON Pointer). senderReactionId is a caller-generated ID (e.g. ULID) that uniquely identifies this reaction slot for the sending user in this message.

Precondition: sender_reaction_id

On both variants, sender_reaction_id is embedded in a JSON Pointer (RFC 6901) as the patch key reactions/<id>. SessionClient::message_update rejects an Add or Remove whose sender_reaction_id is empty, or contains / or ~, with ClientError::InvalidArgument. The slash/tilde restriction is unintuitive — emoji-shortcode systems (e.g. :slight_smile:/+1) and any user-supplied string source naturally produce these characters. Generate IDs from a constrained alphabet (ULID, UUID v4, base64url) rather than from user input.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Add

Add a reaction. Patch value: {emoji, sentAt}.

Fields

sender_reaction_id: &'a str

Caller-generated id (e.g. ULID) identifying this reaction slot.

Precondition: must be non-empty and must NOT contain / or ~. See the enum-level “Precondition” section.

emoji: &'a str

Emoji shortcode or Unicode emoji to react with.

sent_at: &'a UTCDate

RFC 3339 timestamp when the reaction was made.

Remove

Remove a reaction. Patch value: null.

Fields

sender_reaction_id: &'a str

Caller-generated id identifying the reaction slot to remove.

Precondition: must be non-empty and must NOT contain / or ~. See the enum-level “Precondition” section.

Trait Implementations

impl<'a> Debug for ReactionChange<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.