fix(29881): infer quote preference for property access conversion in completions (#41041)

src/services/codefixes/fixInvalidJsxCharacters.ts

@@ -42,7 +42,7 @@ namespace ts.codefix {
             return;
         }
 
-        const replacement = useHtmlEntity ? htmlEntity[character] : `{${quote(character, preferences)}}`;
+        const replacement = useHtmlEntity ? htmlEntity[character] : `{${quote(sourceFile, preferences, character)}}`;
         changes.replaceRangeWithText(sourceFile, { pos: start, end: start + 1 }, replacement);
     }
 }

src/services/completions.ts

@@ -308,7 +308,7 @@ namespace ts.Completions {
         }
 
         for (const literal of literals) {
-            entries.push(createCompletionEntryForLiteral(literal, preferences));
+            entries.push(createCompletionEntryForLiteral(sourceFile, preferences, literal));
         }
 
         return {
@@ -360,13 +360,13 @@ namespace ts.Completions {
         });
     }
 
-    function completionNameForLiteral(literal: string | number | PseudoBigInt, preferences: UserPreferences): string {
+    function completionNameForLiteral(sourceFile: SourceFile, preferences: UserPreferences, literal: string | number | PseudoBigInt): string {
         return typeof literal === "object" ? pseudoBigIntToString(literal) + "n" :
-            isString(literal) ? quote(literal, preferences) : JSON.stringify(literal);
+            isString(literal) ? quote(sourceFile, preferences, literal) : JSON.stringify(literal);
     }
 
-    function createCompletionEntryForLiteral(literal: string | number | PseudoBigInt, preferences: UserPreferences): CompletionEntry {
-        return { name: completionNameForLiteral(literal, preferences), kind: ScriptElementKind.string, kindModifiers: ScriptElementKindModifier.none, sortText: SortText.LocationPriority };
+    function createCompletionEntryForLiteral(sourceFile: SourceFile, preferences: UserPreferences, literal: string | number | PseudoBigInt): CompletionEntry {
+        return { name: completionNameForLiteral(sourceFile, preferences, literal), kind: ScriptElementKind.string, kindModifiers: ScriptElementKindModifier.none, sortText: SortText.LocationPriority };
     }
 
     function createCompletionEntry(
@@ -391,13 +391,13 @@ namespace ts.Completions {
         const useBraces = origin && originIsSymbolMember(origin) || needsConvertPropertyAccess;
         if (origin && originIsThisType(origin)) {
             insertText = needsConvertPropertyAccess
-                ? `this${insertQuestionDot ? "?." : ""}[${quotePropertyName(name, preferences)}]`
+                ? `this${insertQuestionDot ? "?." : ""}[${quotePropertyName(sourceFile, preferences, name)}]`
                 : `this${insertQuestionDot ? "?." : "."}${name}`;
         }
         // We should only have needsConvertPropertyAccess if there's a property access to convert. But see #21790.
         // Somehow there was a global with a non-identifier name. Hopefully someone will complain about getting a "foo bar" global completion and provide a repro.
         else if ((useBraces || insertQuestionDot) && propertyAccessToConvert) {
-            insertText = useBraces ? needsConvertPropertyAccess ? `[${quotePropertyName(name, preferences)}]` : `[${name}]` : name;
+            insertText = useBraces ? needsConvertPropertyAccess ? `[${quotePropertyName(sourceFile, preferences, name)}]` : `[${name}]` : name;
             if (insertQuestionDot || propertyAccessToConvert.questionDotToken) {
                 insertText = `?.${insertText}`;
             }
@@ -458,12 +458,12 @@ namespace ts.Completions {
         };
     }
 
-    function quotePropertyName(name: string, preferences: UserPreferences): string {
+    function quotePropertyName(sourceFile: SourceFile, preferences: UserPreferences, name: string,): string {
         if (/^\d+$/.test(name)) {
             return name;
         }
 
-        return quote(name, preferences);
+        return quote(sourceFile, preferences, name);
     }
 
     function isRecommendedCompletionMatch(localSymbol: Symbol, recommendedCompletion: Symbol | undefined, checker: TypeChecker): boolean {
@@ -614,7 +614,7 @@ namespace ts.Completions {
 
         const { symbols, literals, location, completionKind, symbolToOriginInfoMap, previousToken, isJsxInitializer, isTypeOnlyLocation } = completionData;
 
-        const literal = find(literals, l => completionNameForLiteral(l, preferences) === entryId.name);
+        const literal = find(literals, l => completionNameForLiteral(sourceFile, preferences, l) === entryId.name);
         if (literal !== undefined) return { type: "literal", literal };
 
         // Find the symbol with the matching entry name.
@@ -678,7 +678,7 @@ namespace ts.Completions {
             }
             case "literal": {
                 const { literal } = symbolCompletion;
-                return createSimpleDetails(completionNameForLiteral(literal, preferences), ScriptElementKind.string, typeof literal === "string" ? SymbolDisplayPartKind.stringLiteral : SymbolDisplayPartKind.numericLiteral);
+                return createSimpleDetails(completionNameForLiteral(sourceFile, preferences, literal), ScriptElementKind.string, typeof literal === "string" ? SymbolDisplayPartKind.stringLiteral : SymbolDisplayPartKind.numericLiteral);
             }
             case "none":
                 // Didn't find a symbol with this name.  See if we can find a keyword instead.

src/services/utilities.ts

@@ -2473,20 +2473,11 @@ namespace ts {
         }
     }
 
-    export function quote(text: string, preferences: UserPreferences): string {
+    export function quote(sourceFile: SourceFile, preferences: UserPreferences, text: string): string {
         // Editors can pass in undefined or empty string - we want to infer the preference in those cases.
-        const quotePreference = preferences.quotePreference || "auto";
+        const quotePreference = getQuotePreference(sourceFile, preferences);
         const quoted = JSON.stringify(text);
-        switch (quotePreference) {
-            // TODO use getQuotePreference to infer the actual quote style.
-            case "auto":
-            case "double":
-                return quoted;
-            case "single":
-                return `'${stripQuotes(quoted).replace("'", "\\'").replace('\\"', '"')}'`;
-            default:
-                return Debug.assertNever(quotePreference);
-        }
+        return quotePreference === QuotePreference.Single ? `'${stripQuotes(quoted).replace("'", "\\'").replace('\\"', '"')}'` : quoted;
     }
 
     export function isEqualityOperatorKind(kind: SyntaxKind): kind is EqualityOperator {

tests/cases/fourslash/completionForStringLiteral_quotePreference7.ts

@@ -0,0 +1,22 @@
+/// <reference path='fourslash.ts'/>
+
+// @filename: /a.ts
+////export const a = null;
+
+// @filename: /b.ts
+////import { a } from './a';
+////
+////const foo = { '#': null };
+////foo[|./**/|]
+
+goTo.file("/b.ts");
+verify.completions({
+    marker: "",
+    exact: [
+        { name: "#", insertText: "['#']", replacementSpan: test.ranges()[0] },
+    ],
+    preferences: {
+        includeInsertTextCompletions: true,
+        quotePreference: "auto"
+    }
+});