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example of type guards

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Nikita Galaiko 2023-02-07 09:14:12 +01:00
parent 9e310056e1
commit 843c213c07
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1 changed files with 16 additions and 4 deletions
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20
src/lib/crdt.ts
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@ -1,10 +1,22 @@
import { Doc } from "yjs";
import { diffChars } from "diff";
export type Delta =
| { retain: number }
| { delete: number }
| { insert: string };
type DeltaRetain = { retain: number };
type DeltaDelete = { delete: number };
type DeltaInsert = { insert: string };
export type Delta = DeltaRetain | DeltaDelete | DeltaInsert;
export namespace Delta {
export const isRetain = (delta: Delta): delta is DeltaRetain =>
"retain" in delta;
export const isDelete = (delta: Delta): delta is DeltaDelete =>
"delete" in delta;
export const isInsert = (delta: Delta): delta is DeltaInsert =>
"insert" in delta;
}
// Compute the set of Yjs delta operations (that is, `insert` and
// `delete`) required to go from initialText to finalText.