Change flag name to checkJs

Author: mhegazy

src/compiler/commandLineParser.ts

@@ -483,7 +483,7 @@ namespace ts {
             }
         },
         {
-            name: "checkJsFiles",
+            name: "checkJs",
             type: "boolean",
             experimental: true,
             description: Diagnostics.Report_errors_in_js_files

src/compiler/program.ts

@@ -906,7 +906,7 @@ namespace ts {
                 const bindDiagnostics = sourceFile.bindDiagnostics;
                 // For JavaScript files, we don't want to report semantic errors unless ecplicitlly requested.
                 const includeCheckDiagnostics = !isSourceFileJavaScript(sourceFile) ||
-                    (sourceFile.checkJsDirective ? sourceFile.checkJsDirective.enabled : options.checkJsFiles);
+                    (sourceFile.checkJsDirective ? sourceFile.checkJsDirective.enabled : options.checkJs);
                 const checkDiagnostics = includeCheckDiagnostics ? typeChecker.getDiagnostics(sourceFile, cancellationToken) : [];
                 const fileProcessingDiagnosticsInFile = fileProcessingDiagnostics.getDiagnostics(sourceFile.fileName);
                 const programDiagnosticsInFile = programDiagnostics.getDiagnostics(sourceFile.fileName);

src/compiler/types.ts

@@ -3317,7 +3317,7 @@
         alwaysStrict?: boolean;  // Always combine with strict property
         baseUrl?: string;
         charset?: string;
-        checkJsFiles?: boolean;
+        checkJs?: boolean;
         /* @internal */ configFilePath?: string;
         declaration?: boolean;
         declarationDir?: string;

tests/cases/compiler/checkJsFiles.ts

@@ -1,5 +1,5 @@
 // @allowJs: true
-// @checkJsFiles: true
+// @checkJs: true
 // @noEmit: true
 
 // @fileName: a.js

tests/cases/compiler/checkJsFiles2.ts

@@ -1,5 +1,5 @@
 // @allowJs: true
-// @checkJsFiles: false
+// @checkJs: false
 // @noEmit: true
 
 // @fileName: a.js

tests/cases/compiler/checkJsFiles4.ts

@@ -1,5 +1,5 @@
 // @allowJs: true
-// @checkJsFiles: false
+// @checkJs: false
 // @noEmit: true
 
 // @fileName: a.js

tests/cases/compiler/checkJsFiles5.ts

@@ -1,5 +1,5 @@
 // @allowJs: true
-// @checkJsFiles: true
+// @checkJs: true
 // @noEmit: true
 
 // @fileName: a.js