Merge pull request #21243 from Microsoft/watchOptions

Different watchFile and watchDirectory options through environment variable

Author: sheetalkamat

src/compiler/commandLineParser.ts

@@ -2029,7 +2029,7 @@ namespace ts {
     export function getFileNamesFromConfigSpecs(spec: ConfigFileSpecs, basePath: string, options: CompilerOptions, host: ParseConfigHost, extraFileExtensions: ReadonlyArray<JsFileExtensionInfo> = []): ExpandResult {
         basePath = normalizePath(basePath);
 
-        const keyMapper = host.useCaseSensitiveFileNames ? caseSensitiveKeyMapper : caseInsensitiveKeyMapper;
+        const keyMapper = host.useCaseSensitiveFileNames ? identity : toLowerCase;
 
         // Literal file names (provided via the "files" array in tsconfig.json) are stored in a
         // file map with a possibly case insensitive key. We use this map later when when including
@@ -2233,24 +2233,6 @@ namespace ts {
         }
     }
 
-    /**
-     * Gets a case sensitive key.
-     *
-     * @param key The original key.
-     */
-    function caseSensitiveKeyMapper(key: string) {
-        return key;
-    }
-
-    /**
-     * Gets a case insensitive key.
-     *
-     * @param key The original key.
-     */
-    function caseInsensitiveKeyMapper(key: string) {
-        return key.toLowerCase();
-    }
-
     /**
      * Produces a cleaned version of compiler options with personally identifiying info (aka, paths) removed.
      * Also converts enum values back to strings.

src/compiler/core.ts

@@ -25,6 +25,10 @@ namespace ts {
 /* @internal */
 namespace ts {
     export const emptyArray: never[] = [] as never[];
+    export function closeFileWatcher(watcher: FileWatcher) {
+        watcher.close();
+    }
+
     /** Create a MapLike with good performance. */
     function createDictionaryObject<T>(): MapLike<T> {
         const map = Object.create(/*prototype*/ null); // tslint:disable-line:no-null-keyword
@@ -3142,4 +3146,36 @@ namespace ts {
     export function singleElementArray<T>(t: T | undefined): T[] | undefined {
         return t === undefined ? undefined : [t];
     }
+
+    export function enumerateInsertsAndDeletes<T, U>(newItems: ReadonlyArray<T>, oldItems: ReadonlyArray<U>, comparer: (a: T, b: U) => Comparison, inserted: (newItem: T) => void, deleted: (oldItem: U) => void, unchanged?: (oldItem: U, newItem: T) => void) {
+        unchanged = unchanged || noop;
+        let newIndex = 0;
+        let oldIndex = 0;
+        const newLen = newItems.length;
+        const oldLen = oldItems.length;
+        while (newIndex < newLen && oldIndex < oldLen) {
+            const newItem = newItems[newIndex];
+            const oldItem = oldItems[oldIndex];
+            const compareResult = comparer(newItem, oldItem);
+            if (compareResult === Comparison.LessThan) {
+                inserted(newItem);
+                newIndex++;
+            }
+            else if (compareResult === Comparison.GreaterThan) {
+                deleted(oldItem);
+                oldIndex++;
+            }
+            else {
+                unchanged(oldItem, newItem);
+                newIndex++;
+                oldIndex++;
+            }
+        }
+        while (newIndex < newLen) {
+            inserted(newItems[newIndex++]);
+        }
+        while (oldIndex < oldLen) {
+            deleted(oldItems[oldIndex++]);
+        }
+    }
 }