Function updateOptionsForWatchFile

test/fixtures/snapshot/typescript.js:6804–6830

(options, useNonPollingWatchers)

            return fixedChunkSizePollingWatchFile || (fixedChunkSizePollingWatchFile = createFixedChunkSizePollingWatchFile({ getModifiedTime: getModifiedTime, setTimeout: setTimeout }));
        }
        function updateOptionsForWatchFile(options, useNonPollingWatchers) {
            if (options && options.watchFile !== undefined)
                return options;
            switch (tscWatchFile) {
                case "PriorityPollingInterval":
                    // Use polling interval based on priority when create watch using host.watchFile
                    return { watchFile: ts.WatchFileKind.PriorityPollingInterval };
                case "DynamicPriorityPolling":
                    // Use polling interval but change the interval depending on file changes and their default polling interval
                    return { watchFile: ts.WatchFileKind.DynamicPriorityPolling };
                case "UseFsEvents":
                    // Use notifications from FS to watch with falling back to fs.watchFile
                    return generateWatchFileOptions(ts.WatchFileKind.UseFsEvents, ts.PollingWatchKind.PriorityInterval, options);
                case "UseFsEventsWithFallbackDynamicPolling":
                    // Use notifications from FS to watch with falling back to dynamic watch file
                    return generateWatchFileOptions(ts.WatchFileKind.UseFsEvents, ts.PollingWatchKind.DynamicPriority, options);
                case "UseFsEventsOnParentDirectory":
                    useNonPollingWatchers = true;
                // fall through
                default:
                    return useNonPollingWatchers ?
                        // Use notifications from FS to watch with falling back to fs.watchFile
                        generateWatchFileOptions(ts.WatchFileKind.UseFsEventsOnParentDirectory, ts.PollingWatchKind.PriorityInterval, options) :
                        // Default to do not use fixed polling interval
                        { watchFile: (defaultWatchFileKind === null || defaultWatchFileKind === void 0 ? void 0 : defaultWatchFileKind()) || ts.WatchFileKind.FixedPollingInterval };
            }
        }
        function generateWatchFileOptions(watchFile, fallbackPolling, options) {
            var defaultFallbackPolling = options === null || options === void 0 ? void 0 : options.fallbackPolling;
            return {