File size: 818 Bytes
1e92f2d | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | import { Operation, Range, isObject } from 'slate'
interface Batch {
operations: Operation[]
selectionBefore: Range | null
}
/**
* `History` objects hold all of the operations that are applied to a value, so
* they can be undone or redone as necessary.
*/
export interface History {
redos: Batch[]
undos: Batch[]
}
// eslint-disable-next-line no-redeclare
export const History = {
/**
* Check if a value is a `History` object.
*/
isHistory(value: any): value is History {
return (
isObject(value) &&
Array.isArray(value.redos) &&
Array.isArray(value.undos) &&
(value.redos.length === 0 ||
Operation.isOperationList(value.redos[0].operations)) &&
(value.undos.length === 0 ||
Operation.isOperationList(value.undos[0].operations))
)
},
}
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