Function verifyOutputDirectory

packages/client-generator-js/src/generateClient.ts:557–594

(directory: string, datamodel: string, schemaPath: string)

}

async function verifyOutputDirectory(directory: string, datamodel: string, schemaPath: string) {
  let content: string
  try {
    content = await fs.readFile(path.join(directory, 'package.json'), 'utf8')
  } catch (e) {
    if (e.code === 'ENOENT') {
      // no package.json exists, we are good
      return
    }
    throw e
  }
  const { name } = JSON.parse(content)
  if (name === clientPkg.name) {
    const message = [`Generating client into ${bold(directory)} is not allowed.`]
    message.push('This package is used by `prisma generate` and overwriting its content is dangerous.')
    message.push('')
    message.push('Suggestion:')
    const outputDeclaration = findOutputPathDeclaration(datamodel)

    if (outputDeclaration && outputDeclaration.content.includes(clientPkg.name)) {
      const outputLine = outputDeclaration.content
      message.push(`In ${bold(schemaPath)} replace:`)
      message.push('')
      message.push(`${dim(outputDeclaration.lineNumber)} ${replacePackageName(outputLine, red(clientPkg.name))}`)
      message.push('with')

      message.push(`${dim(outputDeclaration.lineNumber)} ${replacePackageName(outputLine, green('.prisma/client'))}`)
    } else {
      message.push(`Generate client into ${bold(replacePackageName(directory, green('.prisma/client')))} instead`)
    }

    message.push('')
    message.push("You won't need to change your imports.")
    message.push('Imports from `@prisma/client` will be automatically forwarded to `.prisma/client`')
    const error = new Error(message.join('\n'))
    throw error
  }
}

function replacePackageName(directoryPath: string, replacement: string): string {
  return directoryPath.replace(clientPkg.name, replacement)