Function getEnvironmentOption

ses.cjs:373–413

(
    optionName,
    defaultSetting,
    optOtherValues=  undefined)

   * @returns {string}
   */
  const getEnvironmentOption=  (
    optionName,
    defaultSetting,
    optOtherValues=  undefined)=>
       {
    typeof optionName===  'string'||
      Fail `Environment option name ${q(optionName)} must be a string.`;
    typeof defaultSetting===  'string'||
      Fail `Environment option default setting ${q(
        defaultSetting)
        } must be a string.`;

    /** @type {string} */
    let setting=  defaultSetting;
    const globalProcess=  aGlobal.process||  undefined;
    const globalEnv=
       typeof globalProcess===  'object'&&  globalProcess.env||   undefined;
    if( typeof globalEnv===  'object') {
      if( optionName in globalEnv) {
        if( !dropNames) {
          arrayPush(capturedEnvironmentOptionNames, optionName);
         }
        const optionValue=  globalEnv[optionName];
        // eslint-disable-next-line @endo/no-polymorphic-call
        typeof optionValue===  'string'||
          Fail `Environment option named ${q(
            optionName)
            }, if present, must have a corresponding string value, got ${q(
            optionValue)
            }`;
        setting=  optionValue;
       }
     }
    optOtherValues===  undefined||
      setting===  defaultSetting||
      arrayIncludes(optOtherValues, setting)||
      Fail `Unrecognized ${q(optionName)} value ${q(
        setting)
        }. Expected one of ${q([defaultSetting,...optOtherValues]) }`;
    return setting;
   };
  freeze(getEnvironmentOption);

  /**