switch to better user-facing name, matches default of true

internal name remains to match default falsy value of undefined.

Author: KiaraGrouwstra

src/compiler/checker.ts

@@ -64,7 +64,8 @@ namespace ts {
         const noUnusedIdentifiers = !!compilerOptions.noUnusedLocals || !!compilerOptions.noUnusedParameters;
         const allowSyntheticDefaultImports = typeof compilerOptions.allowSyntheticDefaultImports !== "undefined" ? compilerOptions.allowSyntheticDefaultImports : modulekind === ModuleKind.System;
         const strictNullChecks = compilerOptions.strictNullChecks === undefined ? compilerOptions.strict : compilerOptions.strictNullChecks;
-        const granularConst = compilerOptions.granularConst;
+        const widenTypes = compilerOptions.widenTypes === undefined ? true : compilerOptions.widenTypes;
+        const granularConst = !widenTypes;
         const noImplicitAny = compilerOptions.noImplicitAny === undefined ? compilerOptions.strict : compilerOptions.noImplicitAny;
         const noImplicitThis = compilerOptions.noImplicitThis === undefined ? compilerOptions.strict : compilerOptions.noImplicitThis;
 

src/compiler/commandLineParser.ts

@@ -270,11 +270,11 @@ namespace ts {
             description: Diagnostics.Enable_strict_null_checks
         },
         {
-            name: "granularConst",
+            name: "widenTypes",
             type: "boolean",
             showInSimplifiedHelpView: true,
             category: Diagnostics.Strict_Type_Checking_Options,
-            description: Diagnostics.Enable_granular_type_inference_using_const
+            description: Diagnostics.Automatically_widen_types_even_in_params_and_const
         },
         {
             name: "noImplicitThis",

src/compiler/diagnosticMessages.json

@@ -3302,7 +3302,7 @@
         "category": "Message",
         "code": 6185
     },
-    "Enable granular type inference using `const`.": {
+    "Automatically widen types even in params and `const`.": {
         "category": "Message",
         "code": 6186
     },

src/compiler/types.ts

@@ -3622,7 +3622,7 @@ namespace ts {
         sourceRoot?: string;
         strict?: boolean;
         strictNullChecks?: boolean;  // Always combine with strict property
-        granularConst?: boolean;
+        widenTypes?: boolean;
         /* @internal */ stripInternal?: boolean;
         suppressExcessPropertyErrors?: boolean;
         suppressImplicitAnyIndexErrors?: boolean;

src/harness/unittests/configurationExtension.ts

@@ -16,10 +16,10 @@ namespace ts {
                 strictNullChecks: false
             }
         },
-        "/dev/tsconfig.granularconst.json": {
+        "/dev/tsconfig.widenTypes.json": {
             extends: "./tsconfig",
             compilerOptions: {
-                granularConst: true
+                widenTypes: false
             }
         },
         "/dev/configs/base.json": {

src/harness/unittests/transpile.ts

@@ -413,8 +413,8 @@ var x = 0;`, {
             options: { compilerOptions: { strictNullChecks: true }, fileName: "input.js", reportDiagnostics: true }
         });
 
-        transpilesCorrectly("Supports setting 'granularConst'", "x;", {
-            options: { compilerOptions: { granularConst: true }, fileName: "input.js", reportDiagnostics: true }
+        transpilesCorrectly("Supports setting 'widenTypes'", "x;", {
+            options: { compilerOptions: { widenTypes: true }, fileName: "input.js", reportDiagnostics: true }
         });
 
         transpilesCorrectly("Supports setting 'stripInternal'", "x;", {

src/server/protocol.ts

@@ -2448,7 +2448,7 @@ namespace ts.server.protocol {
         sourceRoot?: string;
         strict?: boolean;
         strictNullChecks?: boolean;
-        granularConst?: boolean;
+        widenTypes?: boolean;
         suppressExcessPropertyErrors?: boolean;
         suppressImplicitAnyIndexErrors?: boolean;
         target?: ScriptTarget | ts.ScriptTarget;

tests/cases/compiler/dontWiden.ts

@@ -1,4 +1,4 @@
-// @granularConst: true
+// @widenTypes: false
 
 const c = [1, 'a'];
 const d = { a: 1, b: 'c' };