Feat/quick fix for types

src/compiler/checker.ts

@@ -1764,9 +1764,8 @@ namespace ts {
             nameNotFoundMessage: DiagnosticMessage | undefined,
             nameArg: __String | Identifier | undefined,
             isUse: boolean,
-            excludeGlobals = false,
-            issueSuggestions?: boolean): Symbol | undefined {
-            return resolveNameHelper(location, name, meaning, nameNotFoundMessage, nameArg, isUse, excludeGlobals, getSymbol, issueSuggestions);
+            excludeGlobals = false): Symbol | undefined {
+            return resolveNameHelper(location, name, meaning, nameNotFoundMessage, nameArg, isUse, excludeGlobals, getSymbol);
         }
 
         function resolveNameHelper(
@@ -1777,7 +1776,7 @@ namespace ts {
             nameArg: __String | Identifier | undefined,
             isUse: boolean,
             excludeGlobals: boolean,
-            lookup: typeof getSymbol, issueSuggestions?: boolean): Symbol | undefined {
+            lookup: typeof getSymbol): Symbol | undefined {
             const originalLocation = location; // needed for did-you-mean error reporting, which gathers candidates starting from the original location
             let result: Symbol | undefined;
             let lastLocation: Node | undefined;
@@ -2116,7 +2115,7 @@ namespace ts {
                         !checkAndReportErrorForUsingNamespaceModuleAsValue(errorLocation, name, meaning) &&
                         !checkAndReportErrorForUsingValueAsType(errorLocation, name, meaning)) {
                         let suggestion: Symbol | undefined;
-                        if (issueSuggestions && suggestionCount < maximumSuggestionCount) {
+                        if (suggestionCount < maximumSuggestionCount) {
                             suggestion = getSuggestedSymbolForNonexistentSymbol(originalLocation, name, meaning);
                             const isGlobalScopeAugmentationDeclaration = suggestion?.valueDeclaration && isAmbientModule(suggestion.valueDeclaration) && isGlobalScopeAugmentation(suggestion.valueDeclaration);
                             if (isGlobalScopeAugmentationDeclaration) {
@@ -2125,10 +2124,11 @@ namespace ts {
                             if (suggestion) {
                                 const suggestionName = symbolToString(suggestion);
                                 const isUncheckedJS = isUncheckedJSSuggestion(originalLocation, suggestion, /*excludeClasses*/ false);
-                                const message = isUncheckedJS ? Diagnostics.Could_not_find_name_0_Did_you_mean_1 : Diagnostics.Cannot_find_name_0_Did_you_mean_1;
+                                const message = meaning === SymbolFlags.Namespace || nameArg && typeof nameArg !== "string" && nodeIsSynthesized(nameArg) ? Diagnostics.Cannot_find_namespace_0_Did_you_mean_1
+                                    : isUncheckedJS ? Diagnostics.Could_not_find_name_0_Did_you_mean_1
+                                    : Diagnostics.Cannot_find_name_0_Did_you_mean_1;
                                 const diagnostic = createError(errorLocation, message, diagnosticName(nameArg!), suggestionName);
                                 addErrorOrSuggestion(!isUncheckedJS, diagnostic);
-
                                 if (suggestion.valueDeclaration) {
                                     addRelatedInfo(
                                         diagnostic,
@@ -3238,7 +3238,7 @@ namespace ts {
             if (name.kind === SyntaxKind.Identifier) {
                 const message = meaning === namespaceMeaning || nodeIsSynthesized(name) ? Diagnostics.Cannot_find_namespace_0 : getCannotFindNameDiagnosticForName(getFirstIdentifier(name));
                 const symbolFromJSPrototype = isInJSFile(name) && !nodeIsSynthesized(name) ? resolveEntityNameFromAssignmentDeclaration(name, meaning) : undefined;
-                symbol = getMergedSymbol(resolveName(location || name, name.escapedText, meaning, ignoreErrors || symbolFromJSPrototype ? undefined : message, name, /*isUse*/ true));
+                symbol = getMergedSymbol(resolveName(location || name, name.escapedText, meaning, ignoreErrors || symbolFromJSPrototype ? undefined : message, name, /*isUse*/ true, false));
                 if (!symbol) {
                     return getMergedSymbol(symbolFromJSPrototype);
                 }
@@ -22449,8 +22449,7 @@ namespace ts {
                         getCannotFindNameDiagnosticForName(node),
                         node,
                         !isWriteOnlyAccess(node),
-                        /*excludeGlobals*/ false,
-                        /*issueSuggestions*/ true) || unknownSymbol;
+                        /*excludeGlobals*/ false) || unknownSymbol;
             }
             return links.resolvedSymbol;
         }
@@ -28535,7 +28534,20 @@ namespace ts {
                 // Sometimes the symbol is found when location is a return type of a function: `typeof x` and `x` is declared in the body of the function
                 // So the table *contains* `x` but `x` isn't actually in scope.
                 // However, resolveNameHelper will continue and call this callback again, so we'll eventually get a correct suggestion.
-                return symbol || getSpellingSuggestionForName(unescapeLeadingUnderscores(name), arrayFrom(symbols.values()), meaning);
+                if (symbol) return symbol;
+                let candidates: Symbol[];
+                if (symbols === globals) {
+                    const primitives = mapDefined(
+                        ["string", "number", "boolean", "object", "bigint", "symbol"],
+                        s => symbols.has((s.charAt(0).toUpperCase() + s.slice(1)) as __String)
+                            ? createSymbol(SymbolFlags.TypeAlias, s as __String) as Symbol
+                            : undefined);
+                    candidates = primitives.concat(arrayFrom(symbols.values()));
+                }
+                else {
+                    candidates = arrayFrom(symbols.values());
+                }
+                return getSpellingSuggestionForName(unescapeLeadingUnderscores(name), candidates, meaning);
             });
             return result;
         }

src/compiler/diagnosticMessages.json

@@ -3337,6 +3337,10 @@
         "category": "Error",
         "code": 2822
     },
+    "Cannot find namespace '{0}'. Did you mean '{1}'?": {
+        "category": "Error",
+        "code": 2833
+    },
 
     "Import declaration '{0}' is using private name '{1}'.": {
         "category": "Error",

src/services/codefixes/fixSpelling.ts

@@ -6,6 +6,7 @@ namespace ts.codefix {
         Diagnostics.Property_0_may_not_exist_on_type_1_Did_you_mean_2.code,
         Diagnostics.Cannot_find_name_0_Did_you_mean_1.code,
         Diagnostics.Could_not_find_name_0_Did_you_mean_1.code,
+        Diagnostics.Cannot_find_namespace_0_Did_you_mean_1.code,
         Diagnostics.Cannot_find_name_0_Did_you_mean_the_instance_member_this_0.code,
         Diagnostics.Cannot_find_name_0_Did_you_mean_the_static_member_1_0.code,
         Diagnostics._0_has_no_exported_member_named_1_Did_you_mean_2.code,

tests/baselines/reference/declarationEmitUnknownImport.errors.txt

@@ -1,10 +1,13 @@
+tests/cases/compiler/declarationEmitUnknownImport.ts(1,1): error TS2303: Circular definition of import alias 'Foo'.
 tests/cases/compiler/declarationEmitUnknownImport.ts(1,14): error TS2304: Cannot find name 'SomeNonExistingName'.
 tests/cases/compiler/declarationEmitUnknownImport.ts(1,14): error TS2503: Cannot find namespace 'SomeNonExistingName'.
 tests/cases/compiler/declarationEmitUnknownImport.ts(1,14): error TS4000: Import declaration 'Foo' is using private name 'SomeNonExistingName'.
 
 
-==== tests/cases/compiler/declarationEmitUnknownImport.ts (3 errors) ====
+==== tests/cases/compiler/declarationEmitUnknownImport.ts (4 errors) ====
     import Foo = SomeNonExistingName
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS2303: Circular definition of import alias 'Foo'.
                  ~~~~~~~~~~~~~~~~~~~
 !!! error TS2304: Cannot find name 'SomeNonExistingName'.
                  ~~~~~~~~~~~~~~~~~~~

tests/baselines/reference/declarationEmitUnknownImport2.errors.txt

@@ -1,12 +1,15 @@
+tests/cases/compiler/declarationEmitUnknownImport2.ts(1,1): error TS2303: Circular definition of import alias 'Foo'.
 tests/cases/compiler/declarationEmitUnknownImport2.ts(1,12): error TS1005: '=' expected.
 tests/cases/compiler/declarationEmitUnknownImport2.ts(1,12): error TS2304: Cannot find name 'From'.
 tests/cases/compiler/declarationEmitUnknownImport2.ts(1,12): error TS2503: Cannot find namespace 'From'.
 tests/cases/compiler/declarationEmitUnknownImport2.ts(1,12): error TS4000: Import declaration 'Foo' is using private name 'From'.
 tests/cases/compiler/declarationEmitUnknownImport2.ts(1,17): error TS1005: ';' expected.
 
 
-==== tests/cases/compiler/declarationEmitUnknownImport2.ts (5 errors) ====
+==== tests/cases/compiler/declarationEmitUnknownImport2.ts (6 errors) ====
     import Foo From './Foo'; // Syntax error
+    ~~~~~~~~~~~~~~~
+!!! error TS2303: Circular definition of import alias 'Foo'.
                ~~~~
 !!! error TS1005: '=' expected.
                ~~~~

tests/baselines/reference/extendArray.errors.txt

@@ -1,5 +1,5 @@
-tests/cases/compiler/extendArray.ts(7,19): error TS2304: Cannot find name '_element'.
-tests/cases/compiler/extendArray.ts(7,32): error TS2304: Cannot find name '_element'.
+tests/cases/compiler/extendArray.ts(7,19): error TS2552: Cannot find name '_element'. Did you mean 'Element'?
+tests/cases/compiler/extendArray.ts(7,32): error TS2552: Cannot find name '_element'. Did you mean 'Element'?
 
 
 ==== tests/cases/compiler/extendArray.ts (2 errors) ====
@@ -11,9 +11,11 @@ tests/cases/compiler/extendArray.ts(7,32): error TS2304: Cannot find name '_elem
       interface Array {
         collect(fn:(e:_element) => _element[]) : any[];
                       ~~~~~~~~
-!!! error TS2304: Cannot find name '_element'.
+!!! error TS2552: Cannot find name '_element'. Did you mean 'Element'?
+!!! related TS2728 /.ts/lib.dom.d.ts:4792:13: 'Element' is declared here.
                                    ~~~~~~~~
-!!! error TS2304: Cannot find name '_element'.
+!!! error TS2552: Cannot find name '_element'. Did you mean 'Element'?
+!!! related TS2728 /.ts/lib.dom.d.ts:4792:13: 'Element' is declared here.
       }
     }
 

tests/baselines/reference/importedModuleAddToGlobal.errors.txt

@@ -1,4 +1,4 @@
-tests/cases/compiler/importedModuleAddToGlobal.ts(15,23): error TS2503: Cannot find namespace 'b'.
+tests/cases/compiler/importedModuleAddToGlobal.ts(15,23): error TS2833: Cannot find namespace 'b'. Did you mean 'B'?
 
 
 ==== tests/cases/compiler/importedModuleAddToGlobal.ts (1 errors) ====
@@ -18,5 +18,6 @@ tests/cases/compiler/importedModuleAddToGlobal.ts(15,23): error TS2503: Cannot f
         import a = A;
         function hello(): b.B { return null; }
                           ~
-!!! error TS2503: Cannot find namespace 'b'.
+!!! error TS2833: Cannot find namespace 'b'. Did you mean 'B'?
+!!! related TS2728 tests/cases/compiler/importedModuleAddToGlobal.ts:8:8: 'B' is declared here.
     }

tests/baselines/reference/invalidInstantiatedModule.errors.txt

@@ -1,6 +1,6 @@
 tests/cases/conformance/internalModules/moduleDeclarations/invalidInstantiatedModule.ts(2,18): error TS2300: Duplicate identifier 'Point'.
 tests/cases/conformance/internalModules/moduleDeclarations/invalidInstantiatedModule.ts(3,16): error TS2300: Duplicate identifier 'Point'.
-tests/cases/conformance/internalModules/moduleDeclarations/invalidInstantiatedModule.ts(12,8): error TS2503: Cannot find namespace 'm'.
+tests/cases/conformance/internalModules/moduleDeclarations/invalidInstantiatedModule.ts(12,8): error TS2833: Cannot find namespace 'm'. Did you mean 'M'?
 
 
 ==== tests/cases/conformance/internalModules/moduleDeclarations/invalidInstantiatedModule.ts (3 errors) ====
@@ -21,7 +21,8 @@ tests/cases/conformance/internalModules/moduleDeclarations/invalidInstantiatedMo
     var m = M2;
     var p: m.Point; // Error
            ~
-!!! error TS2503: Cannot find namespace 'm'.
+!!! error TS2833: Cannot find namespace 'm'. Did you mean 'M'?
+!!! related TS2728 tests/cases/conformance/internalModules/moduleDeclarations/invalidInstantiatedModule.ts:1:8: 'M' is declared here.
 
 
 

tests/baselines/reference/jsdocPropertyTagInvalid.errors.txt

@@ -1,12 +1,12 @@
-/a.js(3,15): error TS2304: Cannot find name 'sting'.
+/a.js(3,15): error TS2552: Cannot find name 'sting'. Did you mean 'string'?
 
 
 ==== /a.js (1 errors) ====
     /**
      * @typedef MyType
      * @property {sting} [x]
                   ~~~~~
-!!! error TS2304: Cannot find name 'sting'.
+!!! error TS2552: Cannot find name 'sting'. Did you mean 'string'?
      */
 
     /** @param {MyType} p  */

tests/baselines/reference/jsxFactoryIdentifierWithAbsentParameter.errors.txt

@@ -1,4 +1,4 @@
-tests/cases/compiler/test.tsx(9,17): error TS2304: Cannot find name 'createElement'.
+tests/cases/compiler/test.tsx(9,17): error TS2552: Cannot find name 'createElement'. Did you mean 'frameElement'?
 
 
 ==== tests/cases/compiler/test.tsx (1 errors) ====
@@ -12,7 +12,8 @@ tests/cases/compiler/test.tsx(9,17): error TS2304: Cannot find name 'createEleme
         render() {
             return <div />;
                     ~~~
-!!! error TS2304: Cannot find name 'createElement'.
+!!! error TS2552: Cannot find name 'createElement'. Did you mean 'frameElement'?
+!!! related TS2728 /.ts/lib.dom.d.ts:17075:13: 'frameElement' is declared here.
         }
     }
 

tests/baselines/reference/jsxFactoryQualifiedNameResolutionError.errors.txt

@@ -1,4 +1,4 @@
-tests/cases/compiler/test.tsx(9,17): error TS2304: Cannot find name 'MyElement'.
+tests/cases/compiler/test.tsx(9,17): error TS2552: Cannot find name 'MyElement'. Did you mean 'Element'?
 
 
 ==== tests/cases/compiler/test.tsx (1 errors) ====
@@ -12,6 +12,7 @@ tests/cases/compiler/test.tsx(9,17): error TS2304: Cannot find name 'MyElement'.
         render(createElement) {
             return <div />;
                     ~~~
-!!! error TS2304: Cannot find name 'MyElement'.
+!!! error TS2552: Cannot find name 'MyElement'. Did you mean 'Element'?
+!!! related TS2728 /.ts/lib.dom.d.ts:4792:13: 'Element' is declared here.
         }
     }

tests/baselines/reference/parserUnfinishedTypeNameBeforeKeyword1.errors.txt

@@ -1,11 +1,11 @@
-tests/cases/conformance/parser/ecmascript5/ErrorRecovery/parserUnfinishedTypeNameBeforeKeyword1.ts(1,8): error TS2503: Cannot find namespace 'TypeModule1'.
+tests/cases/conformance/parser/ecmascript5/ErrorRecovery/parserUnfinishedTypeNameBeforeKeyword1.ts(1,8): error TS2833: Cannot find namespace 'TypeModule1'. Did you mean 'TypeModule2'?
 tests/cases/conformance/parser/ecmascript5/ErrorRecovery/parserUnfinishedTypeNameBeforeKeyword1.ts(1,20): error TS1003: Identifier expected.
 
 
 ==== tests/cases/conformance/parser/ecmascript5/ErrorRecovery/parserUnfinishedTypeNameBeforeKeyword1.ts (2 errors) ====
     var x: TypeModule1.
            ~~~~~~~~~~~
-!!! error TS2503: Cannot find namespace 'TypeModule1'.
+!!! error TS2833: Cannot find namespace 'TypeModule1'. Did you mean 'TypeModule2'?
 
 !!! error TS1003: Identifier expected.
     module TypeModule2 {

tests/baselines/reference/parserUnterminatedGeneric1.errors.txt

@@ -1,14 +1,14 @@
-tests/cases/conformance/parser/ecmascript5/ErrorRecovery/parserUnterminatedGeneric1.ts(2,23): error TS2304: Cannot find name 'IPromise'.
-tests/cases/conformance/parser/ecmascript5/ErrorRecovery/parserUnterminatedGeneric1.ts(2,45): error TS2304: Cannot find name 'IPromise'.
+tests/cases/conformance/parser/ecmascript5/ErrorRecovery/parserUnterminatedGeneric1.ts(2,23): error TS2552: Cannot find name 'IPromise'. Did you mean 'Promise'?
+tests/cases/conformance/parser/ecmascript5/ErrorRecovery/parserUnterminatedGeneric1.ts(2,45): error TS2552: Cannot find name 'IPromise'. Did you mean 'Promise'?
 tests/cases/conformance/parser/ecmascript5/ErrorRecovery/parserUnterminatedGeneric1.ts(2,54): error TS1005: '>' expected.
 
 
 ==== tests/cases/conformance/parser/ecmascript5/ErrorRecovery/parserUnterminatedGeneric1.ts (3 errors) ====
      interface IQService {
             all(promises: IPromise < any > []): IPromise<
                           ~~~~~~~~
-!!! error TS2304: Cannot find name 'IPromise'.
+!!! error TS2552: Cannot find name 'IPromise'. Did you mean 'Promise'?
                                                 ~~~~~~~~
-!!! error TS2304: Cannot find name 'IPromise'.
+!!! error TS2552: Cannot find name 'IPromise'. Did you mean 'Promise'?
 
 !!! error TS1005: '>' expected.

tests/baselines/reference/parserUnterminatedGeneric2.errors.txt

@@ -10,8 +10,8 @@ tests/cases/conformance/parser/ecmascript5/ErrorRecovery/parserUnterminatedGener
 tests/cases/conformance/parser/ecmascript5/ErrorRecovery/parserUnterminatedGeneric2.ts(4,37): error TS2693: 'any' only refers to a type, but is being used as a value here.
 tests/cases/conformance/parser/ecmascript5/ErrorRecovery/parserUnterminatedGeneric2.ts(4,41): error TS1005: ';' expected.
 tests/cases/conformance/parser/ecmascript5/ErrorRecovery/parserUnterminatedGeneric2.ts(4,43): error TS2693: 'any' only refers to a type, but is being used as a value here.
-tests/cases/conformance/parser/ecmascript5/ErrorRecovery/parserUnterminatedGeneric2.ts(8,23): error TS2304: Cannot find name 'IPromise'.
-tests/cases/conformance/parser/ecmascript5/ErrorRecovery/parserUnterminatedGeneric2.ts(8,45): error TS2304: Cannot find name 'IPromise'.
+tests/cases/conformance/parser/ecmascript5/ErrorRecovery/parserUnterminatedGeneric2.ts(8,23): error TS2552: Cannot find name 'IPromise'. Did you mean 'Promise'?
+tests/cases/conformance/parser/ecmascript5/ErrorRecovery/parserUnterminatedGeneric2.ts(8,45): error TS2552: Cannot find name 'IPromise'. Did you mean 'Promise'?
 tests/cases/conformance/parser/ecmascript5/ErrorRecovery/parserUnterminatedGeneric2.ts(8,54): error TS1005: '>' expected.
 
 
@@ -49,8 +49,8 @@ tests/cases/conformance/parser/ecmascript5/ErrorRecovery/parserUnterminatedGener
         interface IQService {
             all(promises: IPromise < any > []): IPromise<
                           ~~~~~~~~
-!!! error TS2304: Cannot find name 'IPromise'.
+!!! error TS2552: Cannot find name 'IPromise'. Did you mean 'Promise'?
                                                 ~~~~~~~~
-!!! error TS2304: Cannot find name 'IPromise'.
+!!! error TS2552: Cannot find name 'IPromise'. Did you mean 'Promise'?
 
 !!! error TS1005: '>' expected.

tests/baselines/reference/primaryExpressionMods.errors.txt

@@ -1,5 +1,5 @@
 tests/cases/compiler/primaryExpressionMods.ts(7,8): error TS2709: Cannot use namespace 'M' as a type.
-tests/cases/compiler/primaryExpressionMods.ts(11,8): error TS2503: Cannot find namespace 'm'.
+tests/cases/compiler/primaryExpressionMods.ts(11,8): error TS2833: Cannot find namespace 'm'. Did you mean 'M'?
 
 
 ==== tests/cases/compiler/primaryExpressionMods.ts (2 errors) ====
@@ -17,5 +17,6 @@ tests/cases/compiler/primaryExpressionMods.ts(11,8): error TS2503: Cannot find n
     var x2 = m.a;           // Same as M.a
     var q: m.P;             // Error
            ~
-!!! error TS2503: Cannot find namespace 'm'.
+!!! error TS2833: Cannot find namespace 'm'. Did you mean 'M'?
+!!! related TS2728 tests/cases/compiler/primaryExpressionMods.ts:1:8: 'M' is declared here.
 

tests/cases/fourslash/codeFixSpellingCaseSensitive4.ts

@@ -0,0 +1,26 @@
+/// <reference path='fourslash.ts' />
+
+//// declare let a: numbers;
+//// declare let b: Numbers;
+//// declare let c: objects;
+//// declare let d: Objects;
+//// declare let e: RegEx;
+//// namespace yadda {
+////   export type Thing = string;
+//// }
+//// let f: yaddas.Thing;
+
+verify.codeFixAll({
+    fixId: "fixSpelling",
+    fixAllDescription: "Fix all detected spelling errors",
+    newFileContent:
+`declare let a: number;
+declare let b: Number;
+declare let c: object;
+declare let d: Object;
+declare let e: RegExp;
+namespace yadda {
+  export type Thing = string;
+}
+let f: yadda.Thing;`,
+});