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perf: this caches the transaction diffing to not have to recompute #1656

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perf: this caches the transaction diffing to not have to recompute #1656

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18 changes: 17 additions & 1 deletion packages/core/src/api/nodeUtil.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -149,6 +149,15 @@ function areBlocksDifferentExcludingChildren<
);
}

const blocksChangedMap = new WeakMap<
Transaction,
{
appendedTransactions: Transaction[];
blocksChanged: BlocksChanged<any, any, any>;
}
>();
const defaultAppendedTransactions: Transaction[] = [];

/**
* Get the blocks that were changed by a transaction.
* @param transaction The transaction to get the changes from.
Expand All @@ -161,8 +170,15 @@ export function getBlocksChangedByTransaction<
SSchema extends StyleSchema = DefaultStyleSchema
>(
transaction: Transaction,
appendedTransactions: Transaction[] = []
appendedTransactions: Transaction[] = defaultAppendedTransactions
): BlocksChanged<BSchema, ISchema, SSchema> {
if (
blocksChangedMap.has(transaction) &&
blocksChangedMap.get(transaction)!.appendedTransactions ===
appendedTransactions
) {
return blocksChangedMap.get(transaction)!.blocksChanged;
}
let source: BlockChangeSource = { type: "local" };

if (transaction.getMeta("paste")) {
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