Merge pull request #7716 from ouchihao/codex/bug-scaled-price-exponent

fix(pricing): preserve exponents when trimming scaled prices

frontend/src/utils/__tests__/pricing.formatScaled.spec.ts

@@ -0,0 +1,25 @@
+import { describe, expect, it } from 'vitest'
+import { formatScaled } from '../pricing'
+
+describe('formatScaled', () => {
+  it.each([
+    [1e-10, 1, '$1e-10'],
+    [1.25e-10, 1, '$1.25e-10'],
+    [1e-20, 1, '$1e-20'],
+    [1e-16, 1_000_000, '$1e-10'],
+    [1e10, 1, '$10000000000'],
+  ])('preserves the magnitude of %s scaled by %s', (value, scale, expected) => {
+    expect(formatScaled(value, scale)).toBe(expected)
+  })
+
+  it.each([
+    [0.000003, 1_000_000, 0, '$3'],
+    [0.000003, 1_000_000, 2, '$3.00'],
+    [1.25e-8, 1_000_000, 2, '$0.0125'],
+    [5e-8, 1_000_000, 0, '$0.05'],
+    [0, 1, 2, '$0.00'],
+    [null, 1_000_000, 0, '-'],
+  ])('retains ordinary pricing and padding for %s', (value, scale, digits, expected) => {
+    expect(formatScaled(value, scale, digits)).toBe(expected)
+  })
+})

frontend/src/utils/pricing.ts

@@ -12,7 +12,7 @@
  */
 export function formatScaled(value: number | null, scale: number, minFractionDigits = 0): string {
   if (value == null) return '-'
-  let s = (value * scale).toPrecision(10).replace(/\.?0+$/, '')
+  let s = Number((value * scale).toPrecision(10)).toString()
   if (minFractionDigits > 0 && !s.includes('e')) {
     const dot = s.indexOf('.')
     const digits = dot === -1 ? 0 : s.length - dot - 1