How to use the graphql-config.writeSchema function in graphql-config

console.log(
      argv.json
        ? JSON.stringify(newSchemaResult, null, 2)
        : printSchema(newSchemaResult as GraphQLSchema),
    )
  } else if (argv.json) {
    if (!fs.existsSync(schemaPath)) {
      mkdirp.sync(dirname(schemaPath))
    }
    fs.writeFileSync(argv.output, JSON.stringify(newSchemaResult, null, 2))
  } else {
    schemaPath = schemaPath || config!.schemaPath
    if (!fs.existsSync(schemaPath)) {
      mkdirp.sync(dirname(schemaPath))
    }
    await writeSchema(schemaPath as string, newSchemaResult as GraphQLSchema, {
      source: endpoint.url,
      timestamp: new Date().toString(),
    })
  }

  if (schemaPath) {
    log(
      chalk.green(
        `${
          config && config.projectName && config.projectName !== 'unnamed'
            ? `project ${chalk.blue(config.projectName)} - `
            : ''
        }${
          endpointName && endpointName !== 'unnamed'
            ? `endpoint ${chalk.blue(endpointName)} - `
            : ''