validateConfigs.ts

import chalk from 'chalk'
import { Config } from '../config'

export const validateConfigs = (configs: Config[]) => {
  const errors = []

  if (configs.length === 0) errors.push('config array is empty')

  configs.forEach((config, i) => {
    const whichConfig = configs.length === 1 ? 'the config' : `config #${i + 1}`

    if (!config.endpoint && !config.schema && !config.fetcher)
      errors.push(`you didn't provide either \`endpoint\`, \`schema\` or \`fetcher\` option in ${whichConfig}`)

    if ([config.endpoint, config.schema, config.fetcher].filter(i => i).length > 1)
      errors.push(
        `you provided two or more conflicting options in ${whichConfig}, only one of either \`endpoint\`, \`schema\` or \`fetcher\` is allowed`,
      )

    if (!config.output) errors.push(`you didn't provide an \`output\` option in ${whichConfig}`)

    if (config.headers) {
      config.headers.forEach(header => {
        if (!header.includes(':')) errors.push(`header options is invalid in ${whichConfig}`)
      })
    }
  })

  errors.forEach(error => console.log(chalk.red(`Error: ${error}`)))

  return errors.length === 0
}