@sanity/assist/src/helpers/styleguide.ts

You create the instructions; Sanity AI Assist does the rest.

import {packageName} from '../constants'
import {TranslateStyleguide, TranslateStyleguideContext} from '../translate/types'

export function validateStyleguide(styleguide: string | undefined) {
  if (styleguide && styleguide.length > 2000) {
    throw new Error(
      `[${packageName}]: \`translate.styleguide\` value is too long. It must be 2000 characters or less, but was ${styleguide.length} characters`,
    )
  }
  return styleguide
}

export function createStyleGuideResolver(
  styleguide: TranslateStyleguide | undefined,
  context: TranslateStyleguideContext,
) {
  return async () => {
    if (typeof styleguide !== 'function') {
      return styleguide
    }
    const styleguideResult = await styleguide(context)
    return validateStyleguide(styleguideResult)
  }
}