How to use the @angular/compiler-cli/src/transformers/api.EmitFlags function in @angular/compiler-cli

extendedConfigPath + ".json";
                    if (fs.existsSync(extendedConfigPath)) {
                        // Call read config recursively as TypeScript only merges CompilerOptions
                        return readExtendedConfigFile_1(extendedConfigPath, baseConfig);
                    }
                }
                return { config: baseConfig };
            };
            var _b = readExtendedConfigFile_1(projectFile), config = _b.config, error = _b.error;
            if (error) {
                return {
                    project: project,
                    errors: [error],
                    rootNames: [],
                    options: {},
                    emitFlags: api.EmitFlags.Default
                };
            }
            var parseConfigHost = {
                useCaseSensitiveFileNames: true,
                fileExists: fs.existsSync,
                readDirectory: ts.sys.readDirectory,
                readFile: ts.sys.readFile
            };
            var parsed = ts.parseJsonConfigFileContent(config, parseConfigHost, basePath, existingOptions);
            var rootNames = parsed.fileNames.map(function (f) { return path.normalize(f); });
            var options = createNgCompilerOptions(basePath, config, parsed.options);
            var emitFlags = api.EmitFlags.Default;
            if (!(options.skipMetadataEmit || options.flatModuleOutFile)) {
                emitFlags |= api.EmitFlags.Metadata;
            }
            if (options.skipTemplateCodegen) {

function readXi18nCommandLineAndConfiguration(args) {
        var options = {};
        var parsedArgs = require('minimist')(args);
        if (parsedArgs.outFile)
            options.i18nOutFile = parsedArgs.outFile;
        if (parsedArgs.i18nFormat)
            options.i18nOutFormat = parsedArgs.i18nFormat;
        if (parsedArgs.locale)
            options.i18nOutLocale = parsedArgs.locale;
        var config = main_1.readCommandLineAndConfiguration(args, options, [
            'outFile',
            'i18nFormat',
            'locale',
        ]);
        // only emit the i18nBundle but nothing else.
        return tslib_1.__assign({}, config, { emitFlags: api.EmitFlags.I18nBundle });
    }
    // Entry point

if (!(options.skipMetadataEmit || options.flatModuleOutFile)) {
                emitFlags |= api.EmitFlags.Metadata;
            }
            if (options.skipTemplateCodegen) {
                emitFlags = emitFlags & ~api.EmitFlags.Codegen;
            }
            return { project: projectFile, rootNames: rootNames, options: options, errors: parsed.errors, emitFlags: emitFlags };
        }
        catch (e) {
            var errors = [{
                    category: ts.DiagnosticCategory.Error,
                    messageText: e.stack,
                    source: api.SOURCE,
                    code: api.UNKNOWN_ERROR_CODE
                }];
            return { project: '', errors: errors, rootNames: [], options: {}, emitFlags: api.EmitFlags.Default };
        }
    }
    exports.readConfiguration = readConfiguration;

options: {},
                    emitFlags: api.EmitFlags.Default
                };
            }
            var parseConfigHost = {
                useCaseSensitiveFileNames: true,
                fileExists: fs.existsSync,
                readDirectory: ts.sys.readDirectory,
                readFile: ts.sys.readFile
            };
            var parsed = ts.parseJsonConfigFileContent(config, parseConfigHost, basePath, existingOptions);
            var rootNames = parsed.fileNames.map(function (f) { return path.normalize(f); });
            var options = createNgCompilerOptions(basePath, config, parsed.options);
            var emitFlags = api.EmitFlags.Default;
            if (!(options.skipMetadataEmit || options.flatModuleOutFile)) {
                emitFlags |= api.EmitFlags.Metadata;
            }
            if (options.skipTemplateCodegen) {
                emitFlags = emitFlags & ~api.EmitFlags.Codegen;
            }
            return { project: projectFile, rootNames: rootNames, options: options, errors: parsed.errors, emitFlags: emitFlags };
        }
        catch (e) {
            var errors = [{
                    category: ts.DiagnosticCategory.Error,
                    messageText: e.stack,
                    source: api.SOURCE,
                    code: api.UNKNOWN_ERROR_CODE
                }];
            return { project: '', errors: errors, rootNames: [], options: {}, emitFlags: api.EmitFlags.Default };
        }
    }

var cmdConfig = ts.parseCommandLine(args);
        var project = cmdConfig.options.project || '.';
        var cmdErrors = cmdConfig.errors.filter(function (e) {
            if (typeof e.messageText === 'string') {
                var msg_1 = e.messageText;
                return !ngCmdLineOptions.some(function (o) { return msg_1.indexOf(o) >= 0; });
            }
            return true;
        });
        if (cmdErrors.length) {
            return {
                project: project,
                rootNames: [],
                options: cmdConfig.options,
                errors: cmdErrors,
                emitFlags: api.EmitFlags.Default
            };
        }
        var allDiagnostics = [];
        var config = perform_compile_1.readConfiguration(project, cmdConfig.options);
        var options = tslib_1.__assign({}, config.options, existingOptions);
        if (options.locale) {
            options.i18nInLocale = options.locale;
        }
        return {
            project: project,
            rootNames: config.rootNames, options: options,
            errors: config.errors,
            emitFlags: config.emitFlags
        };
    }
    exports.readCommandLineAndConfiguration = readCommandLineAndConfiguration;

errors: [error],
                    rootNames: [],
                    options: {},
                    emitFlags: api.EmitFlags.Default
                };
            }
            var parseConfigHost = {
                useCaseSensitiveFileNames: true,
                fileExists: fs.existsSync,
                readDirectory: ts.sys.readDirectory,
                readFile: ts.sys.readFile
            };
            var parsed = ts.parseJsonConfigFileContent(config, parseConfigHost, basePath, existingOptions);
            var rootNames = parsed.fileNames.map(function (f) { return path.normalize(f); });
            var options = createNgCompilerOptions(basePath, config, parsed.options);
            var emitFlags = api.EmitFlags.Default;
            if (!(options.skipMetadataEmit || options.flatModuleOutFile)) {
                emitFlags |= api.EmitFlags.Metadata;
            }
            if (options.skipTemplateCodegen) {
                emitFlags = emitFlags & ~api.EmitFlags.Codegen;
            }
            return { project: projectFile, rootNames: rootNames, options: options, errors: parsed.errors, emitFlags: emitFlags };
        }
        catch (e) {
            var errors = [{
                    category: ts.DiagnosticCategory.Error,
                    messageText: e.stack,
                    source: api.SOURCE,
                    code: api.UNKNOWN_ERROR_CODE
                }];
            return { project: '', errors: errors, rootNames: [], options: {}, emitFlags: api.EmitFlags.Default };