陈煜
b2c22ca050
Support positive repayment discounts and negative surcharges with exact decimal conversion. Add independent trend toggles, pointer and keyboard date inspection, tests and Chinese documentation.
8 lines
435 B
TypeScript
8 lines
435 B
TypeScript
// UI: positive discount, negative surcharge. API stores the opposite fee sign.
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// Flip the decimal string directly to preserve all eight fractional digits.
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export function repaymentFee(discount: string) {
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if (!/^-?(0|[1-9]\d{0,15})(\.\d{1,8})?$/.test(discount)) throw new Error('还款优惠格式无效');
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if (/^-?0(?:\.0+)?$/.test(discount)) return '0';
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return discount.startsWith('-') ? discount.slice(1) : '-' + discount;
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}
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