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← Open Cap Table Protocol Canton Node SDK

Reference

parseFeesFromUpdate

Decode AmuletRules_Transfer exercise summaries into FeeAnalysis structures with string-safe arithmetic validation.

Requires TreeEvent containing ExercisedTreeEvent with choice === 'AmuletRules_Transfer'. Validates exerciseResult.summary shape via internal guards, aggregates holdingFees, outputFees, senderChangeFee using decimal-string addition, derives balanceChanges, computes feeValidation.isBalanced by comparing totalBalanceChange vs totalFees within 1e-8 tolerance.

Throws ValidationError when shape mismatched.

Setup

import { parseFeesFromUpdate } from '@fairmint/canton-node-sdk';

Minimal example

const analysis = parseFeesFromUpdate(treeEvent);

console.log(analysis.feeBreakdown.holdingFees);

Parameters

  • treeEvent — Single exercised TreeEvent extracted from eventTree.

Returns

FeeAnalysis.

Errors

Throws ValidationError when choice differs or summary incomplete.

See also

Source

src/utils/parsers/fee-parser.ts