123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657
module.exports = function (type) {  const helpText = `${type === 'vega' ? 'Compile' : 'Render'} a Vega-Lite specification to ${    type === 'vega' ? 'Vega' : type.toUpperCase()  }.Usage: vl2${type} [vega_json_spec_file] [output_${type}_file]  If no arguments are provided, reads from stdin.  If output_${type}_file is not provided, writes to stdout.  For errors and log messages, writes to stderr.To load data, you may need to set a base directory:  For web retrieval, use '-b http://host/data/'.  For files, use '-b file:///dir/data/' (absolute) or '-b data/' (relative).`;
  const args = require('yargs').usage(helpText).demand(0);
  args    .string('b')    .alias('b', 'base')    .describe('b', 'Base directory for data loading. Defaults to the directory of the input spec.');
  args    .string('l')    .alias('l', 'loglevel')    .describe('l', 'Level of log messages written to stderr. One of "error", "warn" (default), "info", or "debug".');
  args    .string('c')    .alias('c', 'config')    .describe('c', 'Vega config object. Either a JSON file or a .js file that exports the config object.');
  args    .string('f')    .alias('f', 'format')    .describe('f', 'Number format locale descriptor. Either a JSON file or a .js file that exports the locale object.');
  args    .string('t')    .alias('t', 'timeFormat')    .describe(      't',      'Date/time format locale descriptor. Either a JSON file or a .js file that exports the locale object.'    );
  if (type === 'svg') {    args.boolean('h').alias('h', 'header').describe('h', 'Include XML header and SVG doctype.');  }
  args.number('s').alias('s', 'scale').default('s', 1).describe('s', 'Output resolution scale factor.');
  args.number('seed').describe('seed', 'Seed for random number generation.');
  if (type === 'vega') {    args.boolean('p').alias('p', 'pretty').describe('p', 'Output human readable/pretty spec.');  }
  return args.help().version().argv;};