add spelling suggestion support for module

src/compiler/checker.ts

@@ -294,6 +294,7 @@ namespace ts {
             getAllPossiblePropertiesOfTypes,
             getSuggestionForNonexistentProperty: (node, type) => getSuggestionForNonexistentProperty(node, type),
             getSuggestionForNonexistentSymbol: (location, name, meaning) => getSuggestionForNonexistentSymbol(location, escapeLeadingUnderscores(name), meaning),
+            getSuggestionForNonexistentModule: (node, target) => getSuggestionForNonexistentModule(node, target),
             getBaseConstraintOfType,
             getDefaultFromTypeParameter: type => type && type.flags & TypeFlags.TypeParameter ? getDefaultFromTypeParameter(type as TypeParameter) : undefined,
             resolveName(name, location, meaning, excludeGlobals) {

src/compiler/types.ts

@@ -2890,6 +2890,7 @@ namespace ts {
         getApparentType(type: Type): Type;
         getSuggestionForNonexistentProperty(node: Identifier, containingType: Type): string | undefined;
         getSuggestionForNonexistentSymbol(location: Node, name: string, meaning: SymbolFlags): string | undefined;
+        getSuggestionForNonexistentModule(node: Identifier, target: Symbol): string | undefined;
         getBaseConstraintOfType(type: Type): Type | undefined;
         getDefaultFromTypeParameter(type: Type): Type | undefined;
 

src/services/codefixes/fixSpelling.ts

@@ -4,12 +4,13 @@ namespace ts.codefix {
     const errorCodes = [
         Diagnostics.Property_0_does_not_exist_on_type_1_Did_you_mean_2.code,
         Diagnostics.Cannot_find_name_0_Did_you_mean_1.code,
+        Diagnostics.Module_0_has_no_exported_member_1_Did_you_mean_2.code,
     ];
     registerCodeFix({
         errorCodes,
         getCodeActions(context) {
             const { sourceFile } = context;
-            const info = getInfo(sourceFile, context.span.start, context.program.getTypeChecker());
+            const info = getInfo(sourceFile, context.span.start, context);
             if (!info) return undefined;
             const { node, suggestion } = info;
             const changes = textChanges.ChangeTracker.with(context, t => doChange(t, sourceFile, node, suggestion));
@@ -18,23 +19,32 @@ namespace ts.codefix {
         },
         fixIds: [fixId],
         getAllCodeActions: context => codeFixAll(context, errorCodes, (changes, diag) => {
-            const info = getInfo(diag.file!, diag.start!, context.program.getTypeChecker());
+            const info = getInfo(diag.file!, diag.start!, context);
             if (info) doChange(changes, context.sourceFile, info.node, info.suggestion);
         }),
     });
 
-    function getInfo(sourceFile: SourceFile, pos: number, checker: TypeChecker): { node: Node, suggestion: string } | undefined {
+    function getInfo(sourceFile: SourceFile, pos: number, context: CodeFixContextBase): { node: Node, suggestion: string } | undefined {
         // This is the identifier of the misspelled word. eg:
         // this.speling = 1;
         //      ^^^^^^^
         const node = getTokenAtPosition(sourceFile, pos, /*includeJsDocComment*/ false); // TODO: GH#15852
+        const checker = context.program.getTypeChecker();
 
         let suggestion: string;
         if (isPropertyAccessExpression(node.parent) && node.parent.name === node) {
             Debug.assert(node.kind === SyntaxKind.Identifier);
             const containingType = checker.getTypeAtLocation(node.parent.expression);
             suggestion = checker.getSuggestionForNonexistentProperty(node as Identifier, containingType);
         }
+        else if (isImportSpecifier(node.parent) && node.parent.name === node) {
+            Debug.assert(node.kind === SyntaxKind.Identifier);
+            const importDeclaration = findAncestor(node, isImportDeclaration);
+            const resolvedSourceFile = getResolvedSourceFileFromImportDeclaration(sourceFile, context, importDeclaration);
+            if (resolvedSourceFile && resolvedSourceFile.symbol) {
+                suggestion = checker.getSuggestionForNonexistentModule(node as Identifier, resolvedSourceFile.symbol);
+            }
+        }
         else {
             const meaning = getMeaningFromLocation(node);
             const name = getTextOfNode(node);
@@ -62,4 +72,13 @@ namespace ts.codefix {
         }
         return flags;
     }
+
+    function getResolvedSourceFileFromImportDeclaration (sourceFile: SourceFile, context: CodeFixContextBase, importDeclaration: ImportDeclaration): SourceFile | undefined {
+        if (!importDeclaration || !isStringLiteralLike(importDeclaration.moduleSpecifier)) return undefined;
+
+        const resolvedModule = getResolvedModule(sourceFile, importDeclaration.moduleSpecifier.text);
+        if (!resolvedModule) return undefined;
+
+        return context.program.getSourceFile(resolvedModule.resolvedFileName);
+    }
 }

tests/baselines/reference/api/tsserverlibrary.d.ts

@@ -1820,6 +1820,7 @@ declare namespace ts {
         getApparentType(type: Type): Type;
         getSuggestionForNonexistentProperty(node: Identifier, containingType: Type): string | undefined;
         getSuggestionForNonexistentSymbol(location: Node, name: string, meaning: SymbolFlags): string | undefined;
+        getSuggestionForNonexistentModule(node: Identifier, target: Symbol): string | undefined;
         getBaseConstraintOfType(type: Type): Type | undefined;
         getDefaultFromTypeParameter(type: Type): Type | undefined;
     }

tests/baselines/reference/api/typescript.d.ts

@@ -1820,6 +1820,7 @@ declare namespace ts {
         getApparentType(type: Type): Type;
         getSuggestionForNonexistentProperty(node: Identifier, containingType: Type): string | undefined;
         getSuggestionForNonexistentSymbol(location: Node, name: string, meaning: SymbolFlags): string | undefined;
+        getSuggestionForNonexistentModule(node: Identifier, target: Symbol): string | undefined;
         getBaseConstraintOfType(type: Type): Type | undefined;
         getDefaultFromTypeParameter(type: Type): Type | undefined;
     }

tests/cases/fourslash/codeFixSpelling5.ts

@@ -0,0 +1,10 @@
+/// <reference path='fourslash.ts' />
+
+// @Filename: f1.ts
+////export const fooooooooo = 1;
+
+// @Filename: f2.ts
+////import {[|fooooooooa|]} from "./f1";
+
+goTo.file("f2.ts")
+verify.rangeAfterCodeFix(`fooooooooo`);