How to use removeAppiumPrefix method in Appium

...64        let isCapAlreadySet = false;65        // Check if the key is already present in firstMatch entries66        for (const firstMatchEntry of (w3cCapabilities.firstMatch || [])) {67          if (_.isPlainObject(firstMatchEntry)68              && _.has(removeAppiumPrefixes(firstMatchEntry), removeAppiumPrefix(defaultCapKey))) {69            isCapAlreadySet = true;70            break;71          }72        }73        // Check if the key is already present in alwaysMatch entries74        isCapAlreadySet = isCapAlreadySet || (_.isPlainObject(w3cCapabilities.alwaysMatch)75          && _.has(removeAppiumPrefixes(w3cCapabilities.alwaysMatch), removeAppiumPrefix(defaultCapKey)));76        if (isCapAlreadySet) {77          // Skip if the key is already present in the provided caps78          continue;79        }80        // Only add the default capability if it is not overridden81        if (_.isEmpty(w3cCapabilities.firstMatch)) {82          w3cCapabilities.firstMatch = [{[defaultCapKey]: defaultCapValue}];83        } else {84          w3cCapabilities.firstMatch[0][defaultCapKey] = defaultCapValue;85        }86      }87    }88    if (hasJSONWPCaps) {89      jsonwpCapabilities = Object.assign({}, removeAppiumPrefixes(defaultCapabilities), jsonwpCapabilities);90    }91  }92  // Get MJSONWP caps93  if (hasJSONWPCaps) {94    protocol = MJSONWP;95    desiredCaps = jsonwpCapabilities;96    processedJsonwpCapabilities = {...jsonwpCapabilities};97  }98  // Get W3C caps99  if (hasW3CCaps) {100    protocol = W3C;101    // Call the process capabilities algorithm to find matching caps on the W3C102    // (see: https://github.com/jlipps/simple-wd-spec#processing-capabilities)103    let isFixingNeededForW3cCaps = false;104    try {105      desiredCaps = processCapabilities(w3cCapabilities, constraints, true);106    } catch (error) {107      if (!hasJSONWPCaps) {108        return {109          desiredCaps,110          processedJsonwpCapabilities,111          processedW3CCapabilities,112          protocol,113          error,114        };115      }116      logger.info(`Could not parse W3C capabilities: ${error.message}`);117      isFixingNeededForW3cCaps = true;118    }119    if (hasJSONWPCaps && !isFixingNeededForW3cCaps) {120      const differingKeys = _.difference(_.keys(removeAppiumPrefixes(processedJsonwpCapabilities)), _.keys(removeAppiumPrefixes(desiredCaps)));121      if (!_.isEmpty(differingKeys)) {122        logger.info(`The following capabilities were provided in the JSONWP desired capabilities that are missing ` +123          `in W3C capabilities: ${JSON.stringify(differingKeys)}`);124        isFixingNeededForW3cCaps = true;125      }126    }127    if (isFixingNeededForW3cCaps && hasJSONWPCaps) {128      logger.info('Trying to fix W3C capabilities by merging them with JSONWP caps');129      w3cCapabilities = fixW3cCapabilities(w3cCapabilities, jsonwpCapabilities);130      try {131        desiredCaps = processCapabilities(w3cCapabilities, constraints, true);132      } catch (error) {133        logger.warn(`Could not parse fixed W3C capabilities: ${error.message}. Falling back to JSONWP protocol`);134        return {135          desiredCaps: processedJsonwpCapabilities,136          processedJsonwpCapabilities,137          processedW3CCapabilities: null,138          protocol: MJSONWP,139        };140      }141    }142    // Create a new w3c capabilities payload that contains only the matching caps in `alwaysMatch`143    processedW3CCapabilities = {144      alwaysMatch: {...insertAppiumPrefixes(desiredCaps)},145      firstMatch: [{}],146    };147  }148  return {desiredCaps, processedJsonwpCapabilities, processedW3CCapabilities, protocol};149}150/**151 * This helper method tries to fix corrupted W3C capabilities by152 * merging them to existing JSONWP capabilities.153 *154 * @param {Object} w3cCaps W3C capabilities155 * @param {Object} jsonwpCaps JSONWP capabilities156 * @returns {Object} Fixed W3C capabilities157 */158function fixW3cCapabilities (w3cCaps, jsonwpCaps) {159  const result = {160    firstMatch: w3cCaps.firstMatch || [],161    alwaysMatch: w3cCaps.alwaysMatch || {},162  };163  const keysToInsert = _.keys(jsonwpCaps);164  const removeMatchingKeys = (match) => {165    _.pull(keysToInsert, match);166    const colonIndex = match.indexOf(':');167    if (colonIndex >= 0 && match.length > colonIndex) {168      _.pull(keysToInsert, match.substring(colonIndex + 1));169    }170    if (keysToInsert.includes(`${W3C_APPIUM_PREFIX}:${match}`)) {171      _.pull(keysToInsert, `${W3C_APPIUM_PREFIX}:${match}`);172    }173  };174  for (const firstMatchEntry of result.firstMatch) {175    for (const pair of _.toPairs(firstMatchEntry)) {176      removeMatchingKeys(pair[0]);177    }178  }179  for (const pair of _.toPairs(result.alwaysMatch)) {180    removeMatchingKeys(pair[0]);181  }182  for (const key of keysToInsert) {183    result.alwaysMatch[key] = jsonwpCaps[key];184  }185  return result;186}187/**188 * Takes a capabilities objects and prefixes capabilities with `appium:`189 * @param {Object} caps Desired capabilities object190 */191function insertAppiumPrefixes (caps) {192  // Standard, non-prefixed capabilities (see https://www.w3.org/TR/webdriver/#dfn-table-of-standard-capabilities)193  const STANDARD_CAPS = [194    'browserName',195    'browserVersion',196    'platformName',197    'acceptInsecureCerts',198    'pageLoadStrategy',199    'proxy',200    'setWindowRect',201    'timeouts',202    'unhandledPromptBehavior'203  ];204  let prefixedCaps = {};205  for (let [name, value] of _.toPairs(caps)) {206    if (STANDARD_CAPS.includes(name) || name.includes(':')) {207      prefixedCaps[name] = value;208    } else {209      prefixedCaps[`${W3C_APPIUM_PREFIX}:${name}`] = value;210    }211  }212  return prefixedCaps;213}214function removeAppiumPrefixes (caps) {215  if (!_.isPlainObject(caps)) {216    return caps;217  }218  const fixedCaps = {};219  for (let [name, value] of _.toPairs(caps)) {220    fixedCaps[removeAppiumPrefix(name)] = value;221  }222  return fixedCaps;223}224function removeAppiumPrefix (key) {225  const prefix = `${W3C_APPIUM_PREFIX}:`;226  return _.startsWith(key, prefix) ? key.substring(prefix.length) : key;227}228function getPackageVersion (pkgName) {229  const pkgInfo = require(`${pkgName}/package.json`) || {};230  return pkgInfo.version;231}232/**233 * Pulls the initial values of Appium settings from the given capabilities argument.234 * Each setting item must satisfy the following format:...