Implement auto-import code actions, port tests and fix some bugs

internal/ast/utilities.go

@@ -1391,10 +1391,6 @@ func GetNameOfDeclaration(declaration *Node) *Node {
 	return nil
 }
 
-func GetImportClauseOfDeclaration(declaration *Declaration) *ImportClause {
-	return declaration.ImportClause().AsImportClause()
-}
-
 func GetNonAssignedNameOfDeclaration(declaration *Node) *Node {
 	// !!!
 	switch declaration.Kind {

internal/astnav/tokens.go

@@ -672,3 +672,60 @@ func shouldSkipChild(node *ast.Node) bool {
 		ast.IsJSDocLinkLike(node) ||
 		ast.IsJSDocTag(node)
 }
+
+// FindChildOfKind searches for a child node or token of the specified kind within a containing node.
+// This function scans through both AST nodes and intervening tokens to find the first match.
+func FindChildOfKind(containingNode *ast.Node, kind ast.Kind, sourceFile *ast.SourceFile) *ast.Node {
+	lastNodePos := containingNode.Pos()
+	scan := scanner.GetScannerForSourceFile(sourceFile, lastNodePos)
+
+	var foundChild *ast.Node
+	visitNode := func(node *ast.Node) bool {
+		if node == nil || node.Flags&ast.NodeFlagsReparsed != 0 {
+			return false
+		}
+		// Look for child in preceding tokens.
+		startPos := lastNodePos
+		for startPos < node.Pos() {
+			tokenKind := scan.Token()
+			tokenFullStart := scan.TokenFullStart()
+			tokenEnd := scan.TokenEnd()
+			token := sourceFile.GetOrCreateToken(tokenKind, tokenFullStart, tokenEnd, containingNode)
+			if tokenKind == kind {
+				foundChild = token
+				return true
+			}
+			startPos = tokenEnd
+			scan.Scan()
+		}
+		if node.Kind == kind {
+			foundChild = node
+			return true
+		}
+
+		lastNodePos = node.End()
+		scan.ResetPos(lastNodePos)
+		return false
+	}
+
+	ast.ForEachChildAndJSDoc(containingNode, sourceFile, visitNode)
+
+	if foundChild != nil {
+		return foundChild
+	}
+
+	// Look for child in trailing tokens.
+	startPos := lastNodePos
+	for startPos < containingNode.End() {
+		tokenKind := scan.Token()
+		tokenFullStart := scan.TokenFullStart()
+		tokenEnd := scan.TokenEnd()
+		token := sourceFile.GetOrCreateToken(tokenKind, tokenFullStart, tokenEnd, containingNode)
+		if tokenKind == kind {
+			return token
+		}
+		startPos = tokenEnd
+		scan.Scan()
+	}
+	return nil
+}

internal/checker/checker.go

@@ -2859,7 +2859,7 @@ func (c *Checker) getDeprecatedSuggestionNode(node *ast.Node) *ast.Node {
 	case ast.KindTaggedTemplateExpression:
 		return c.getDeprecatedSuggestionNode(node.AsTaggedTemplateExpression().Tag)
 	case ast.KindJsxOpeningElement, ast.KindJsxSelfClosingElement:
-		return c.getDeprecatedSuggestionNode(getTagNameOfNode(node))
+		return c.getDeprecatedSuggestionNode(node.TagName())
 	case ast.KindElementAccessExpression:
 		return node.AsElementAccessExpression().ArgumentExpression
 	case ast.KindPropertyAccessExpression:
@@ -30342,7 +30342,7 @@ func (c *Checker) hasContextualTypeWithNoGenericTypes(node *ast.Node, checkMode
 	// If check mode has `CheckMode.RestBindingElement`, we skip binding pattern contextual types,
 	// as we want the type of a rest element to be generic when possible.
 	if (ast.IsIdentifier(node) || ast.IsPropertyAccessExpression(node) || ast.IsElementAccessExpression(node)) &&
-		!((ast.IsJsxOpeningElement(node.Parent) || ast.IsJsxSelfClosingElement(node.Parent)) && getTagNameOfNode(node.Parent) == node) {
+		!((ast.IsJsxOpeningElement(node.Parent) || ast.IsJsxSelfClosingElement(node.Parent)) && node.Parent.TagName() == node) {
 		contextualType := c.getContextualType(node, core.IfElse(checkMode&CheckModeRestBindingElement != 0, ContextFlagsSkipBindingPatterns, ContextFlagsNone))
 		if contextualType != nil {
 			return !c.isGenericType(contextualType)

internal/checker/exports.go

@@ -170,3 +170,15 @@ func (c *Checker) GetIndexSignaturesAtLocation(node *ast.Node) []*ast.Node {
 func (c *Checker) GetResolvedSymbol(node *ast.Node) *ast.Symbol {
 	return c.getResolvedSymbol(node)
 }
+
+func (c *Checker) GetJsxNamespace(location *ast.Node) string {
+	return c.getJsxNamespace(location)
+}
+
+func (c *Checker) ResolveName(name string, location *ast.Node, meaning ast.SymbolFlags, excludeGlobals bool) *ast.Symbol {
+	return c.resolveName(location, name, meaning, nil, true, excludeGlobals)
+}
+
+func (c *Checker) GetSymbolFlags(symbol *ast.Symbol) ast.SymbolFlags {
+	return c.getSymbolFlags(symbol)
+}

internal/checker/utilities.go

@@ -971,6 +971,13 @@ func IsKnownSymbol(symbol *ast.Symbol) bool {
 	return isLateBoundName(symbol.Name)
 }
 
+func IsPrivateIdentifierSymbol(symbol *ast.Symbol) bool {
+	if symbol == nil {
+		return false
+	}
+	return strings.HasPrefix(symbol.Name, ast.InternalSymbolNamePrefix+"#")
+}
+
 func isLateBoundName(name string) bool {
 	return len(name) >= 2 && name[0] == '\xfe' && name[1] == '@'
 }
@@ -1061,10 +1068,6 @@ func isNonNullAccess(node *ast.Node) bool {
 	return ast.IsAccessExpression(node) && ast.IsNonNullExpression(node.Expression())
 }
 
-func getTagNameOfNode(node *ast.Node) *ast.Node {
-	return node.TagName()
-}
-
 func getBindingElementPropertyName(node *ast.Node) *ast.Node {
 	return node.PropertyNameOrName()
 }

internal/fourslash/_scripts/convertFourslash.mts

@@ -175,6 +175,9 @@ function parseFourslashStatement(statement: ts.Statement): Cmd[] | undefined {
                 case "applyCodeActionFromCompletion":
                     // `verify.applyCodeActionFromCompletion(...)`
                     return parseVerifyApplyCodeActionFromCompletionArgs(callExpression.arguments);
+                case "importFixAtPosition":
+                    // `verify.importFixAtPosition(...)`
+                    return parseImportFixAtPositionArgs(callExpression.arguments);
                 case "quickInfoAt":
                 case "quickInfoExists":
                 case "quickInfoIs":
@@ -542,6 +545,46 @@ function parseVerifyApplyCodeActionArgs(arg: ts.Expression): string | undefined
     return `&fourslash.ApplyCodeActionFromCompletionOptions{\n${props.join("\n")}\n}`;
 }
 
+function parseImportFixAtPositionArgs(args: readonly ts.Expression[]): VerifyImportFixAtPositionCmd[] | undefined {
+    if (args.length < 1 || args.length > 3) {
+        console.error(`Expected 1-3 arguments in verify.importFixAtPosition, got ${args.map(arg => arg.getText()).join(", ")}`);
+        return undefined;
+    }
+    const arrayArg = getArrayLiteralExpression(args[0]);
+    if (!arrayArg) {
+        console.error(`Expected array literal for first argument in verify.importFixAtPosition, got ${args[0].getText()}`);
+        return undefined;
+    }
+    const expectedTexts: string[] = [];
+    for (const elem of arrayArg.elements) {
+        const strElem = getStringLiteralLike(elem);
+        if (!strElem) {
+            console.error(`Expected string literal in verify.importFixAtPosition array, got ${elem.getText()}`);
+            return undefined;
+        }
+        expectedTexts.push(getGoMultiLineStringLiteral(strElem.text));
+    }
+
+    // If the array is empty, we should still generate valid Go code
+    if (expectedTexts.length === 0) {
+        expectedTexts.push(""); // This will be handled specially in code generation
+    }
+
+    let preferences: string | undefined;
+    if (args.length > 2 && ts.isObjectLiteralExpression(args[2])) {
+        preferences = parseUserPreferences(args[2]);
+        if (!preferences) {
+            console.error(`Unrecognized user preferences in verify.importFixAtPosition: ${args[2].getText()}`);
+            return undefined;
+        }
+    }
+    return [{
+        kind: "verifyImportFixAtPosition",
+        expectedTexts,
+        preferences: preferences || "nil /*preferences*/",
+    }];
+}
+
 const completionConstants = new Map([
     ["completion.globals", "CompletionGlobals"],
     ["completion.globalTypes", "CompletionGlobalTypes"],
@@ -1240,6 +1283,21 @@ function parseUserPreferences(arg: ts.ObjectLiteralExpression): string | undefin
                 case "quotePreference":
                     preferences.push(`QuotePreference: lsutil.QuotePreference(${prop.initializer.getText()})`);
                     break;
+                case "autoImportFileExcludePatterns":
+                    const arrayArg = getArrayLiteralExpression(prop.initializer);
+                    if (!arrayArg) {
+                        return undefined;
+                    }
+                    const patterns: string[] = [];
+                    for (const elem of arrayArg.elements) {
+                        const strElem = getStringLiteralLike(elem);
+                        if (!strElem) {
+                            return undefined;
+                        }
+                        patterns.push(getGoStringLiteral(strElem.text));
+                    }
+                    preferences.push(`AutoImportFileExcludePatterns: []string{${patterns.join(", ")}}`);
+                    break;
                 case "includeInlayParameterNameHints":
                     let paramHint;
                     if (!ts.isStringLiteralLike(prop.initializer)) {
@@ -1701,6 +1759,12 @@ interface VerifyBaselineInlayHintsCmd {
     preferences: string;
 }
 
+interface VerifyImportFixAtPositionCmd {
+    kind: "verifyImportFixAtPosition";
+    expectedTexts: string[];
+    preferences: string;
+}
+
 interface GoToCmd {
     kind: "goTo";
     // !!! `selectRange` and `rangeStart` require parsing variables and `test.ranges()[n]`
@@ -1739,7 +1803,8 @@ type Cmd =
     | VerifyQuickInfoCmd
     | VerifyBaselineRenameCmd
     | VerifyRenameInfoCmd
-    | VerifyBaselineInlayHintsCmd;
+    | VerifyBaselineInlayHintsCmd
+    | VerifyImportFixAtPositionCmd;
 
 function generateVerifyCompletions({ marker, args, isNewIdentifierLocation, andApplyCodeActionArgs }: VerifyCompletionsCmd): string {
     let expectedList: string;
@@ -1840,6 +1905,14 @@ function generateBaselineInlayHints({ span, preferences }: VerifyBaselineInlayHi
     return `f.VerifyBaselineInlayHints(t, ${span}, ${preferences})`;
 }
 
+function generateImportFixAtPosition({ expectedTexts, preferences }: VerifyImportFixAtPositionCmd): string {
+    // Handle empty array case
+    if (expectedTexts.length === 1 && expectedTexts[0] === "") {
+        return `f.VerifyImportFixAtPosition(t, []string{}, ${preferences})`;
+    }
+    return `f.VerifyImportFixAtPosition(t, []string{\n${expectedTexts.join(",\n")},\n}, ${preferences})`;
+}
+
 function generateCmd(cmd: Cmd): string {
     switch (cmd.kind) {
         case "verifyCompletions":
@@ -1878,6 +1951,8 @@ function generateCmd(cmd: Cmd): string {
             return `f.VerifyRenameFailed(t, ${cmd.preferences})`;
         case "verifyBaselineInlayHints":
             return generateBaselineInlayHints(cmd);
+        case "verifyImportFixAtPosition":
+            return generateImportFixAtPosition(cmd);
         default:
             let neverCommand: never = cmd;
             throw new Error(`Unknown command kind: ${neverCommand as Cmd["kind"]}`);