@jil/args/src/utils/getDefaultValue.ts

A convention based argument parsing and formatting library, with strict validation checks

import {DEFAULT_BOOLEAN_VALUE, DEFAULT_NUMBER_VALUE, DEFAULT_STRING_VALUE} from '../constants';
import {OptionConfig, ValueType} from '../types';

export function getDefaultValue(config: OptionConfig): ValueType {
  let value = config.default as ValueType;

  if (value === undefined) {
    if (config.multiple) {
      value = [];
    } else if (config.type === 'boolean') {
      value = DEFAULT_BOOLEAN_VALUE;
    } else if (config.type === 'number') {
      value = DEFAULT_NUMBER_VALUE;
    } else {
      value = DEFAULT_STRING_VALUE;
    }
  }

  return value;
}