@node-dlc/core

<!doctype html> <html lang="en"> <head> <title>Code coverage report for lib/dlc/HyperbolaPayoutCurve.ts</title> <meta charset="utf-8" /> <link rel="stylesheet" href="../../prettify.css" /> <link rel="stylesheet" href="../../base.css" /> <link rel="shortcut icon" type="image/x-icon" href="../../favicon.png" /> <meta name="viewport" content="width=device-width, initial-scale=1" /> <style type='text/css'> .coverage-summary .sorter { background-image: url(../../sort-arrow-sprite.png); } </style> </head> <body> <div class='wrapper'> <div class='pad1'> <h1><a href="../../index.html">All files</a> / <a href="index.html">lib/dlc</a> HyperbolaPayoutCurve.ts</h1> <div class='clearfix'> <div class='fl pad1y space-right2'> 73.91% Statements 34/46 </div> <div class='fl pad1y space-right2'> 48% Branches 12/25 </div> <div class='fl pad1y space-right2'> 85.71% Functions 6/7 </div> <div class='fl pad1y space-right2'> 73.33% Lines 33/45 </div> </div> Press n or j to go to the next uncovered block, b, p or k for the previous block. </div> <div class='status-line medium'></div> <pre><table class="coverage"> <tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a> <a name='L2'></a><a href='#L2'>2</a> <a name='L3'></a><a href='#L3'>3</a> <a name='L4'></a><a href='#L4'>4</a> <a name='L5'></a><a href='#L5'>5</a> <a name='L6'></a><a href='#L6'>6</a> <a name='L7'></a><a href='#L7'>7</a> <a name='L8'></a><a href='#L8'>8</a> <a name='L9'></a><a href='#L9'>9</a> <a name='L10'></a><a href='#L10'>10</a> <a name='L11'></a><a href='#L11'>11</a> <a name='L12'></a><a href='#L12'>12</a> <a name='L13'></a><a href='#L13'>13</a> <a name='L14'></a><a href='#L14'>14</a> <a name='L15'></a><a href='#L15'>15</a> <a name='L16'></a><a href='#L16'>16</a> <a name='L17'></a><a href='#L17'>17</a> <a name='L18'></a><a href='#L18'>18</a> <a name='L19'></a><a href='#L19'>19</a> <a name='L20'></a><a href='#L20'>20</a> <a name='L21'></a><a href='#L21'>21</a> <a name='L22'></a><a href='#L22'>22</a> <a 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class="line-coverage quiet">1x             1x     1x     1x   46x 46x 46x 46x 46x 46x 46x       14914x 14914x   14914x                                                             14914x       9914x       9914x 9914x   9914x 4x     9910x                     9910x                 15x     15x                   15x       6x                             10x 10x 10x 10x 10x     10x       10x                                                                                                      </td><td class="text"><pre class="prettyprint lang-js">import { HyperbolaPayoutCurvePiece, MessageType, PayoutCurvePieceType, PayoutFunctionV0, RoundingIntervals, } from '@node-dlc/messaging'; import BigNumber from 'bignumber.js';   import { CETPayout } from '..'; import { splitIntoRanges } from './CETCalculator'; import PayoutCurve from './PayoutCurve';   export class HyperbolaPayoutCurve implements PayoutCurve { constructor( private a: BigNumber, private b: BigNumber, private c: BigNumber, private d: BigNumber, private translateOutcome: BigNumber, private translatePayout: BigNumber, private positive: boolean = true, // TODO: support negative pieces ) {}   getPayout(_x: bigint): BigNumber { const { a, b, c, d, translateOutcome, translatePayout } = this; const x = new BigNumber(Number(_x));   const payout = c .times( x .minus(translateOutcome) .plus( x .minus(translateOutcome) .exponentiatedBy(2) .minus(a.times(b).times(4)) .squareRoot(), ) .div(a.times(2)), ) .plus( a .times(d) .times(2) .div( x .minus(translateOutcome) .plus( x .minus(translateOutcome) .exponentiatedBy(2) .minus(a.times(b).times(4)) .squareRoot(), ), ), ) .plus(translatePayout);   return payout; }   getOutcomeForPayout(payout: BigNumber): bigint { const { a, b, c, d, translateOutcome, translatePayout } = this;   // Inverse function // y=(-ad^{2}-bf_{2}^{2}+2bf_{2}x-bx^{2}+df_{1}f_{2}-df_{1}x)/(d(f_{2}-x)) Eif (c.eq(0)) { const denominator = d.times(translatePayout.minus(payout));   if (denominator.eq(0)) { return BigInt(-1); }   const outcome = a .negated() .times(d.exponentiatedBy(2)) .minus(b.times(translatePayout.exponentiatedBy(2))) .plus(b.times(translatePayout).times(payout).times(2)) .minus(b.times(payout.exponentiatedBy(2))) .plus(d.times(translateOutcome).times(translatePayout)) .minus(d.times(translateOutcome).times(payout)) .dividedBy(denominator) .integerValue();   Eif (outcome.isFinite()) return BigInt(outcome.toString()); return BigInt(-1); } else { // y=\left((\sqrt{((adf_{2}-adx+bcf_{2}-bcx-2c\cdot d\cdot f_{1})^{2}-4cd(a^{2}d^{2}-2abcd+abf_{2}^{2}-2abf_{2}x+abx^{2}-adf_{1}f_{2}+adf_{1}x+b^{2}c^{2}-bcf_{1}f_{2}+bcf_{1}x+c\cdot d\cdot f_{1}^{2}))}-adf_{2}+adx-bcf_{2}+bcx+2c\cdot d\cdot f_{1})\right)/(2cd) throw new Error('Not supported'); } }   toPayoutCurvePiece(): HyperbolaPayoutCurvePiece { const { a, b, c, d, translateOutcome, translatePayout, positive } = this;   // Use the constructor with string values to avoid F64 dependency issues const piece = new HyperbolaPayoutCurvePiece( positive, translateOutcome.toString(), translatePayout.toString(), a.toString(), b.toString(), c.toString(), d.toString(), );   return piece; }   equals(curve: HyperbolaPayoutCurve): boolean { return ( this.a.eq(curve.a) && this.b.eq(curve.b) && this.c.eq(curve.c) && this.d.eq(curve.d) && this.translateOutcome.eq(curve.translateOutcome) && this.translatePayout.eq(curve.translatePayout) && this.positive === curve.positive ); }   static fromPayoutCurvePiece( piece: HyperbolaPayoutCurvePiece, ): HyperbolaPayoutCurve { // Convert F64 values to BigNumber using toDecimal().toString() to preserve precision const a = new BigNumber(piece.a.toDecimal().toString()); const b = new BigNumber(piece.b.toDecimal().toString()); const c = new BigNumber(piece.c.toDecimal().toString()); const d = new BigNumber(piece.d.toDecimal().toString()); const translateOutcome = new BigNumber( piece.translateOutcome.toDecimal().toString(), ); const translatePayout = new BigNumber( piece.translatePayout.toDecimal().toString(), );   return new HyperbolaPayoutCurve( a, b, c, d, translateOutcome, translatePayout, piece.usePositivePiece, ); }   static computePayouts( payoutFunction: PayoutFunctionV0, totalCollateral: bigint, roundingIntervals: RoundingIntervals, ): CETPayout[] { if (payoutFunction.payoutFunctionPieces.length !== 1) throw new Error('Must have at least one piece'); const { endPoint, payoutCurvePiece, } = payoutFunction.payoutFunctionPieces[0];   if ( payoutCurvePiece.payoutCurvePieceType !== PayoutCurvePieceType.Hyperbola && payoutCurvePiece.type !== MessageType.HyperbolaPayoutCurvePiece && payoutCurvePiece.type !== MessageType.OldHyperbolaPayoutCurvePiece ) throw new Error('Payout curve piece must be a hyperbola');   const _payoutCurvePiece = payoutCurvePiece as HyperbolaPayoutCurvePiece; const curve = this.fromPayoutCurvePiece(_payoutCurvePiece);   // For the new PayoutFunction structure, get the starting point from the hyperbola piece's leftEndPoint // This matches the rust-dlc implementation where get_first_outcome() returns left_end_point.event_outcome const initialEventOutcome = _payoutCurvePiece.leftEndPoint?.eventOutcome || BigInt(0); const initialOutcomePayout = _payoutCurvePiece.leftEndPoint?.outcomePayout || BigInt(0); return splitIntoRanges( initialEventOutcome, endPoint.eventOutcome, initialOutcomePayout, endPoint.outcomePayout, totalCollateral, curve, roundingIntervals.intervals, ); } }  </pre></td></tr></table></pre> <div class='push'></div> </div> <div class='footer quiet pad2 space-top1 center small'> Code coverage generated by <a href="https://istanbul.js.org/" target="_blank">istanbul</a> at Sun Jul 20 2025 21:18:12 GMT-0700 (Pacific Daylight Saving Time) </div> </div> <script src="../../prettify.js"></script> <script> window.onload = function () { prettyPrint(); }; </script> <script src="../../sorter.js"></script> <script src="../../block-navigation.js"></script> </body> </html>