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// Copyright (c) 2026 Yuren Hao
// Licensed under AGPL-3.0 - see LICENSE file
// OT type definitions for Overleaf's text operation format
/** Insert text at position p */
export interface InsertOp {
i: string
p: number
}
/** Delete text at position p */
export interface DeleteOp {
d: string
p: number
}
/** Comment operation (mark text at position p) */
export interface CommentOp {
c: string
p: number
t: string // threadId
}
export type OtOp = InsertOp | DeleteOp | CommentOp
export function isInsert(op: OtOp): op is InsertOp {
return 'i' in op
}
export function isDelete(op: OtOp): op is DeleteOp {
return 'd' in op
}
export function isComment(op: OtOp): op is CommentOp {
return 'c' in op
}
/** A versioned OT update */
export interface OtUpdate {
doc: string
op: OtOp[]
v: number
hash?: string
lastV?: number
}
/** Possible states of the OT client */
export type OtStateName = 'synchronized' | 'awaitingConfirm' | 'awaitingWithBuffer'
export interface OtState {
name: OtStateName
inflight: OtOp[] | null // ops sent, awaiting ack
buffer: OtOp[] | null // ops queued while awaiting
version: number
}
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