fix: improve Copy Full Type command for indexed access

Author: zardoy

typescript/src/specialCommands/getFullType.ts

@@ -0,0 +1,41 @@
+import { findChildContainingExactPosition } from '../utils'
+
+export default (languageService: ts.LanguageService, sourceFile: ts.SourceFile, position: number) => {
+    let node = findChildContainingExactPosition(sourceFile, position)
+    if (!node) return
+    node = getNodeForQuickInfo(node)
+    const checker = languageService.getProgram()!.getTypeChecker()!
+    const symbol = getSymbolAtLocationForQuickInfo(node, checker)
+    if (!symbol) return
+    const type = checker.getTypeOfSymbol(symbol)
+    return checker.typeToString(type, undefined, ts.TypeFormatFlags.NoTruncation | ts.TypeFormatFlags.NoTypeReduction)
+}
+
+function getNodeForQuickInfo(node: ts.Node): ts.Node {
+    if (ts.isNewExpression(node.parent) && node.pos === node.parent.pos) {
+        return node.parent.expression
+    }
+    if (ts.isNamedTupleMember(node.parent) && node.pos === node.parent.pos) {
+        return node.parent
+    }
+    //@ts-expect-error
+    if (tsFull.isImportMeta(node.parent) && node.parent.name === node) {
+        return node.parent
+    }
+    if (ts.isJsxNamespacedName(node.parent)) {
+        return node.parent
+    }
+    return node
+}
+
+function getSymbolAtLocationForQuickInfo(node: ts.Node, checker: ts.TypeChecker): ts.Symbol | undefined {
+    const object = tsFull.getContainingObjectLiteralElement(node as any) as any
+    if (object) {
+        const contextualType = checker.getContextualType(object.parent)
+        const properties = contextualType && tsFull.getPropertySymbolsFromContextualType(object, checker as any, contextualType as any, /*unionSymbolOk*/ false)
+        if (properties && properties.length === 1) {
+            return properties[0]! as any
+        }
+    }
+    return checker.getSymbolAtLocation(node)
+}

typescript/src/specialCommands/handle.ts

@@ -7,6 +7,7 @@ import { lastResolvedCompletion } from '../completionEntryDetails'
 import { overrideRenameRequest } from '../decorateFindRenameLocations'
 import getEmmetCompletions from './emmet'
 import objectIntoArrayConverters from './objectIntoArrayConverters'
+import getFullType from './getFullType'
 
 export const previousGetCodeActionsResult = {
     value: undefined as undefined | Array<Record<'description' | 'name', string>>,
@@ -238,12 +239,10 @@ export default (
         return lastResolvedCompletion.value
     }
     if (specialCommand === 'getFullType') {
-        const node = findChildContainingExactPosition(sourceFile, position)
-        if (!node) return
-        const checker = languageService.getProgram()!.getTypeChecker()!
-        const type = checker.getTypeAtLocation(node)
+        const text = getFullType(languageService, sourceFile, position)
+        if (!text) return
         return {
-            text: checker.typeToString(type, undefined, ts.TypeFormatFlags.NoTruncation | ts.TypeFormatFlags.NoTypeReduction),
+            text,
         }
     }
     if (specialCommand === 'getArgumentReferencesFromCurrentParameter') {