json-joy
Version:
Collection of libraries for building collaborative editing apps.
16 lines (15 loc) • 633 B
TypeScript
export interface UndoManager {
push<U, R>(undo: UndoItem<U, R>): void;
undo(): void;
redo(): void;
}
export type UndoItem<UndoState = unknown, RedoState = unknown> = [
state: UndoState,
undo: UndoCallback<UndoState, RedoState>
];
export type UndoCallback<UndoState = unknown, RedoState = unknown> = (state: UndoState) => RedoItem<RedoState, UndoState>;
export type RedoItem<RedoState = unknown, UndoState = unknown> = [
state: RedoState,
redo: RedoCallback<RedoState, UndoState>
];
export type RedoCallback<RedoState = unknown, UndoState = unknown> = (state: RedoState) => UndoItem<UndoState, RedoState>;