Prisma-enums-are-awesome.ts

import { MeasuringSystem, MeasuringUnit, MeasuringUnitKind } from "db"

const COMMON = { unitless: { count: MeasuringUnit.count } }

type UnitGroup = Record<MeasuringUnitKind, Record<string, MeasuringUnit>>
type SystemUnits = Record<MeasuringSystem, UnitGroup>

export const units: SystemUnits = {
  [MeasuringSystem.METRIC]: {
    ...COMMON,
    temperature: { tempC: MeasuringUnit.tempC },
    mass: { kg: MeasuringUnit.kg, gram: MeasuringUnit.gram },
    volume: { litre: MeasuringUnit.litre, millilitre: MeasuringUnit.millilitre },
  },
  [MeasuringSystem.US]: {
    ...COMMON,
    temperature: { tempF: MeasuringUnit.tempF },
    mass: { pound: MeasuringUnit.pound, oz: MeasuringUnit.oz },
    volume: {
      floz: MeasuringUnit.floz,
      teaspoon: MeasuringUnit.teaspoon,
      tablespoon: MeasuringUnit.tablespoon,
      cup: MeasuringUnit.cup,
      pint: MeasuringUnit.pint,
      quart: MeasuringUnit.quart,
    },
  },
  [MeasuringSystem.IMPERIAL]: {
    ...COMMON,
    temperature: { tempF: MeasuringUnit.tempF },
    mass: { pound: MeasuringUnit.pound, oz: MeasuringUnit.oz },
    volume: {
      flozimp: MeasuringUnit.flozimp,
      teaspoon: MeasuringUnit.teaspoon,
      tablespoon: MeasuringUnit.tablespoon,
      cup: MeasuringUnit.cup,
      ptimp: MeasuringUnit.ptimp,
      quart: MeasuringUnit.quart,
    },
  },
}

export function getUnitsForSystem(system: MeasuringSystem): UnitGroup {
  return units[system]
}

This page is awesome for learning about measurement units:
https://opentextbc.ca/basickitchenandfoodservicemanagement/chapter/units-of-measurement/