initial commit

packages/db/shared/helpers/decimal-helpers.ts

@@ -0,0 +1,40 @@
+import * as z from 'zod';
+
+import type { Prisma } from '../../generated/prisma';
+
+import Decimal from "decimal.js";
+
+// DECIMAL HELPERS
+//------------------------------------------------------
+
+export const DecimalJSLikeSchema: z.ZodType<Prisma.DecimalJsLike> = z.object({
+  d: z.array(z.number()),
+  e: z.number(),
+  s: z.number(),
+  // Zod v3/v4 compatible callable check
+  toFixed: z.custom<Prisma.DecimalJsLike['toFixed']>((v) => typeof v === 'function'),
+});
+
+// Accept canonical decimal strings (+/-, optional fraction, optional exponent), or Infinity/NaN.
+export const DECIMAL_STRING_REGEX = /^(?:[+-]?(?:[0-9]+(?:.[0-9]+)?(?:[eE][+-]?[0-9]+)?|Infinity)|NaN)$/;
+
+export const isValidDecimalInput = (
+  v?: null | string | number | Prisma.DecimalJsLike,
+): v is string | number | Prisma.DecimalJsLike => {
+  if (v === undefined || v === null) return false;
+  return (
+    // Explicit instance checks first
+    v instanceof Decimal ||
+    // If Decimal.js is present and imported by the generator, this symbol exists at runtime
+    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+    // @ts-ignore - Decimal may be undefined when not installed; codegen controls the import
+    (typeof Decimal !== 'undefined' && v instanceof Decimal) ||
+    (typeof v === 'object' &&
+      'd' in v &&
+      'e' in v &&
+      's' in v &&
+      'toFixed' in v) ||
+    (typeof v === 'string' && DECIMAL_STRING_REGEX.test(v)) ||
+    typeof v === 'number'
+  );
+};