Avoid repeated JS instantiations about intlc HOT 1 OPEN

Perhaps we could create instances (e.g. for Intl.NumberFormat) once in the module scope and then re-use them, e.g.:

const numberFormat = new Intl.NumberFormat('en-US')

export const a = (params) => `${numberFormat.format(params.number)}k`
export const b = (params) => `Age: ${numberFormat.format(params.number)}`

Although, I think we may need different instances because we need to pass through the options from the variables in the ICU message—e.g. a single message may have both a plain number and a number to be formatted as currency.

FormatJS has createIntlCache which is intended to solve a similar problem:

• https://formatjs.io/docs/react-intl/api/#createintlcache
• Code: https://github.com/formatjs/formatjs/blob/b2cc9c4fd7c529ed18e93b5986b6e1424ee157ba/packages/intl/src/utils.ts#L89

from intlc.