For path completions, include extension as a kindModifier

src/harness/fourslash.ts

@@ -796,8 +796,8 @@ namespace FourSlash {
         }
 
         private verifyCompletionEntry(actual: ts.CompletionEntry, expected: FourSlashInterface.ExpectedCompletionEntry) {
-            const { insertText, replacementSpan, hasAction, isRecommended, kind, text, documentation, tags, source, sourceDisplay } = typeof expected === "string"
-                ? { insertText: undefined, replacementSpan: undefined, hasAction: undefined, isRecommended: undefined, kind: undefined, text: undefined, documentation: undefined, tags: undefined, source: undefined, sourceDisplay: undefined }
+            const { insertText, replacementSpan, hasAction, isRecommended, kind, kindModifiers, text, documentation, tags, source, sourceDisplay } = typeof expected === "string"
+                ? { insertText: undefined, replacementSpan: undefined, hasAction: undefined, isRecommended: undefined, kind: undefined, kindModifiers: undefined, text: undefined, documentation: undefined, tags: undefined, source: undefined, sourceDisplay: undefined }
                 : expected;
 
             if (actual.insertText !== insertText) {
@@ -811,8 +811,12 @@ namespace FourSlash {
                 this.raiseError(`Expected completion replacementSpan to be ${stringify(convertedReplacementSpan)}, got ${stringify(actual.replacementSpan)}`);
             }
 
-            if (kind !== undefined) assert.equal(actual.kind, kind);
-            if (typeof expected !== "string" && "kindModifiers" in expected) assert.equal(actual.kindModifiers, expected.kindModifiers);
+            if (kind !== undefined || kindModifiers !== undefined) {
+                assert.equal(actual.kind, kind);
+                if (actual.kindModifiers !== (kindModifiers || "")) {
+                    this.raiseError(`Bad kind modifiers for ${actual.name}: Expected ${kindModifiers || ""}, actual ${actual.kindModifiers}`);
+                }
+            }
 
             assert.equal(actual.hasAction, hasAction);
             assert.equal(actual.isRecommended, isRecommended);
@@ -4916,7 +4920,7 @@ namespace FourSlashInterface {
         readonly hasAction?: boolean, // If not specified, will assert that this is false.
         readonly isRecommended?: boolean; // If not specified, will assert that this is false.
         readonly kind?: string, // If not specified, won't assert about this
-        readonly kindModifiers?: string;
+        readonly kindModifiers?: string, // Must be paired with 'kind'
         readonly text?: string;
         readonly documentation?: string;
         readonly sourceDisplay?: string;

src/services/completions.ts

@@ -101,9 +101,23 @@ namespace ts.Completions {
     function convertPathCompletions(pathCompletions: ReadonlyArray<PathCompletions.PathCompletion>): CompletionInfo {
         const isGlobalCompletion = false; // We don't want the editor to offer any other completions, such as snippets, inside a comment.
         const isNewIdentifierLocation = true; // The user may type in a path that doesn't yet exist, creating a "new identifier" with respect to the collection of identifiers the server is aware of.
-        const entries = pathCompletions.map(({ name, kind, span }) => ({ name, kind, kindModifiers: ScriptElementKindModifier.none, sortText: "0", replacementSpan: span }));
+        const entries = pathCompletions.map(({ name, kind, span, extension }): CompletionEntry =>
+            ({ name, kind, kindModifiers: kindModifiersFromExtension(extension), sortText: "0", replacementSpan: span }));
         return { isGlobalCompletion, isMemberCompletion: false, isNewIdentifierLocation, entries };
     }
+    function kindModifiersFromExtension(extension: Extension | undefined): ScriptElementKindModifier {
+        switch (extension) {
+            case Extension.Dts: return ScriptElementKindModifier.dtsModifier;
+            case Extension.Js: return ScriptElementKindModifier.jsModifier;
+            case Extension.Json: return ScriptElementKindModifier.jsonModifier;
+            case Extension.Jsx: return ScriptElementKindModifier.jsxModifier;
+            case Extension.Ts: return ScriptElementKindModifier.tsModifier;
+            case Extension.Tsx: return ScriptElementKindModifier.tsxModifier;
+            case undefined: return ScriptElementKindModifier.none;
+            default:
+                return Debug.assertNever(extension);
+        }
+    }
 
     function jsdocCompletionInfo(entries: CompletionEntry[]): CompletionInfo {
         return { isGlobalCompletion: false, isMemberCompletion: false, isNewIdentifierLocation: false, entries };
@@ -638,7 +652,7 @@ namespace ts.Completions {
         switch (completion.kind) {
             case StringLiteralCompletionKind.Paths: {
                 const match = find(completion.paths, p => p.name === name);
-                return match && createCompletionDetails(name, ScriptElementKindModifier.none, match.kind, [textPart(name)]);
+                return match && createCompletionDetails(name, kindModifiersFromExtension(match.extension), match.kind, [textPart(name)]);
             }
             case StringLiteralCompletionKind.Properties: {
                 const match = find(completion.symbols, s => s.name === name);

src/services/pathCompletions.ts

@@ -3,17 +3,22 @@ namespace ts.Completions.PathCompletions {
     export interface NameAndKind {
         readonly name: string;
         readonly kind: ScriptElementKind.scriptElement | ScriptElementKind.directory | ScriptElementKind.externalModuleName;
+        readonly extension: Extension | undefined;
     }
     export interface PathCompletion extends NameAndKind {
         readonly span: TextSpan | undefined;
     }
 
-    function nameAndKind(name: string, kind: NameAndKind["kind"]): NameAndKind {
-        return { name, kind };
+    function nameAndKind(name: string, kind: NameAndKind["kind"], extension: Extension | undefined): NameAndKind {
+        return { name, kind, extension };
     }
+    function directoryResult(name: string): NameAndKind {
+        return nameAndKind(name, ScriptElementKind.directory, /*extension*/ undefined);
+    }
+
     function addReplacementSpans(text: string, textStart: number, names: ReadonlyArray<NameAndKind>): ReadonlyArray<PathCompletion> {
         const span = getDirectoryFragmentTextSpan(text, textStart);
-        return names.map(({ name, kind }): PathCompletion => ({ name, kind, span }));
+        return names.map(({ name, kind, extension }): PathCompletion => ({ name, kind, extension, span }));
     }
 
     export function getStringLiteralCompletionsFromModuleNames(sourceFile: SourceFile, node: LiteralExpression, compilerOptions: CompilerOptions, host: LanguageServiceHost, typeChecker: TypeChecker): ReadonlyArray<PathCompletion> {
@@ -129,22 +134,19 @@ namespace ts.Completions.PathCompletions {
              *
              * both foo.ts and foo.tsx become foo
              */
-            const foundFiles = createMap<true>();
+            const foundFiles = createMap<Extension | undefined>(); // maps file to its extension
             for (let filePath of files) {
                 filePath = normalizePath(filePath);
                 if (exclude && comparePaths(filePath, exclude, scriptPath, ignoreCase) === Comparison.EqualTo) {
                     continue;
                 }
 
                 const foundFileName = includeExtensions || fileExtensionIs(filePath, Extension.Json) ? getBaseFileName(filePath) : removeFileExtension(getBaseFileName(filePath));
-
-                if (!foundFiles.has(foundFileName)) {
-                    foundFiles.set(foundFileName, true);
-                }
+                foundFiles.set(foundFileName, tryGetExtensionFromPath(filePath));
             }
 
-            forEachKey(foundFiles, foundFile => {
-                result.push(nameAndKind(foundFile, ScriptElementKind.scriptElement));
+            foundFiles.forEach((ext, foundFile) => {
+                result.push(nameAndKind(foundFile, ScriptElementKind.scriptElement, ext));
             });
         }
 
@@ -155,7 +157,7 @@ namespace ts.Completions.PathCompletions {
             for (const directory of directories) {
                 const directoryName = getBaseFileName(normalizePath(directory));
                 if (directoryName !== "@types") {
-                    result.push(nameAndKind(directoryName, ScriptElementKind.directory));
+                    result.push(directoryResult(directoryName));
                 }
             }
         }
@@ -183,10 +185,10 @@ namespace ts.Completions.PathCompletions {
             if (!hasProperty(paths, path)) continue;
             const patterns = paths[path];
             if (patterns) {
-                for (const { name, kind } of getCompletionsForPathMapping(path, patterns, fragment, baseDirectory, fileExtensions, host)) {
+                for (const { name, kind, extension } of getCompletionsForPathMapping(path, patterns, fragment, baseDirectory, fileExtensions, host)) {
                     // Path mappings may provide a duplicate way to get to something we've already added, so don't add again.
                     if (!result.some(entry => entry.name === name)) {
-                        result.push(nameAndKind(name, kind));
+                        result.push(nameAndKind(name, kind, extension));
                     }
                 }
             }
@@ -200,7 +202,7 @@ namespace ts.Completions.PathCompletions {
      *      Modules from node_modules (i.e. those listed in package.json)
      *          This includes all files that are found in node_modules/moduleName/ with acceptable file extensions
      */
-    function getCompletionEntriesForNonRelativeModules(fragment: string, scriptPath: string, compilerOptions: CompilerOptions, host: LanguageServiceHost, typeChecker: TypeChecker): NameAndKind[] {
+    function getCompletionEntriesForNonRelativeModules(fragment: string, scriptPath: string, compilerOptions: CompilerOptions, host: LanguageServiceHost, typeChecker: TypeChecker): ReadonlyArray<NameAndKind> {
         const { baseUrl, paths } = compilerOptions;
 
         const result: NameAndKind[] = [];
@@ -217,7 +219,7 @@ namespace ts.Completions.PathCompletions {
 
         const fragmentDirectory = getFragmentDirectory(fragment);
         for (const ambientName of getAmbientModuleCompletions(fragment, fragmentDirectory, typeChecker)) {
-            result.push(nameAndKind(ambientName, ScriptElementKind.externalModuleName));
+            result.push(nameAndKind(ambientName, ScriptElementKind.externalModuleName, /*extension*/ undefined));
         }
 
         getCompletionEntriesFromTypings(host, compilerOptions, scriptPath, fragmentDirectory, extensionOptions, result);
@@ -230,7 +232,7 @@ namespace ts.Completions.PathCompletions {
                 for (const moduleName of enumerateNodeModulesVisibleToScript(host, scriptPath)) {
                     if (!result.some(entry => entry.name === moduleName)) {
                         foundGlobal = true;
-                        result.push(nameAndKind(moduleName, ScriptElementKind.externalModuleName));
+                        result.push(nameAndKind(moduleName, ScriptElementKind.externalModuleName, /*extension*/ undefined));
                     }
                 }
             }
@@ -265,7 +267,7 @@ namespace ts.Completions.PathCompletions {
             getModulesForPathsPattern(remainingFragment, baseUrl, pattern, fileExtensions, host));
 
         function justPathMappingName(name: string): ReadonlyArray<NameAndKind> {
-            return startsWith(name, fragment) ? [{ name, kind: ScriptElementKind.directory }] : emptyArray;
+            return startsWith(name, fragment) ? [directoryResult(name)] : emptyArray;
         }
     }
 
@@ -301,15 +303,21 @@ namespace ts.Completions.PathCompletions {
         // doesn't support. For now, this is safer but slower
         const includeGlob = normalizedSuffix ? "**/*" : "./*";
 
-        const matches = tryReadDirectory(host, baseDirectory, fileExtensions, /*exclude*/ undefined, [includeGlob]).map<NameAndKind>(name => ({ name, kind: ScriptElementKind.scriptElement }));
-        const directories = tryGetDirectories(host, baseDirectory).map(d => combinePaths(baseDirectory, d)).map<NameAndKind>(name => ({ name, kind: ScriptElementKind.directory }));
-
-        // Trim away prefix and suffix
-        return mapDefined<NameAndKind, NameAndKind>(concatenate(matches, directories), ({ name, kind }) => {
-            const normalizedMatch = normalizePath(name);
-            const inner = withoutStartAndEnd(normalizedMatch, completePrefix, normalizedSuffix);
-            return inner !== undefined ? { name: removeLeadingDirectorySeparator(removeFileExtension(inner)), kind } : undefined;
+        const matches = mapDefined(tryReadDirectory(host, baseDirectory, fileExtensions, /*exclude*/ undefined, [includeGlob]), match => {
+            const extension = tryGetExtensionFromPath(match);
+            const name = trimPrefixAndSuffix(match);
+            return name === undefined ? undefined : nameAndKind(removeFileExtension(name), ScriptElementKind.scriptElement, extension);
+        });
+        const directories = mapDefined(tryGetDirectories(host, baseDirectory).map(d => combinePaths(baseDirectory, d)), dir => {
+            const name = trimPrefixAndSuffix(dir);
+            return name === undefined ? undefined : directoryResult(name);
         });
+        return [...matches, ...directories];
+
+        function trimPrefixAndSuffix(path: string): string | undefined {
+            const inner = withoutStartAndEnd(normalizePath(path), completePrefix, normalizedSuffix);
+            return inner === undefined ? undefined : removeLeadingDirectorySeparator(inner);
+        }
     }
 
     function withoutStartAndEnd(s: string, start: string, end: string): string | undefined {
@@ -382,7 +390,10 @@ namespace ts.Completions.PathCompletions {
                 if (options.types && !contains(options.types, packageName)) continue;
 
                 if (fragmentDirectory === undefined) {
-                    pushResult(packageName);
+                    if (!seen.has(packageName)) {
+                        result.push(nameAndKind(packageName, ScriptElementKind.externalModuleName, /*extension*/ undefined));
+                        seen.set(packageName, true);
+                    }
                 }
                 else {
                     const baseDirectory = combinePaths(directory, typeDirectoryName);
@@ -393,13 +404,6 @@ namespace ts.Completions.PathCompletions {
                 }
             }
         }
-
-        function pushResult(moduleName: string) {
-            if (!seen.has(moduleName)) {
-                result.push(nameAndKind(moduleName, ScriptElementKind.externalModuleName));
-                seen.set(moduleName, true);
-            }
-        }
     }
 
     function findPackageJsons(directory: string, host: LanguageServiceHost): string[] {

src/services/types.ts

@@ -1126,7 +1126,14 @@ namespace ts {
         ambientModifier = "declare",
         staticModifier = "static",
         abstractModifier = "abstract",
-        optionalModifier = "optional"
+        optionalModifier = "optional",
+
+        dtsModifier = ".d.ts",
+        tsModifier = ".ts",
+        tsxModifier = ".tsx",
+        jsModifier = ".js",
+        jsxModifier = ".jsx",
+        jsonModifier = ".json",
     }
 
     export const enum ClassificationTypeNames {

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

@@ -5369,7 +5369,13 @@ declare namespace ts {
         ambientModifier = "declare",
         staticModifier = "static",
         abstractModifier = "abstract",
-        optionalModifier = "optional"
+        optionalModifier = "optional",
+        dtsModifier = ".d.ts",
+        tsModifier = ".ts",
+        tsxModifier = ".tsx",
+        jsModifier = ".js",
+        jsxModifier = ".jsx",
+        jsonModifier = ".json"
     }
     enum ClassificationTypeNames {
         comment = "comment",

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

@@ -5369,7 +5369,13 @@ declare namespace ts {
         ambientModifier = "declare",
         staticModifier = "static",
         abstractModifier = "abstract",
-        optionalModifier = "optional"
+        optionalModifier = "optional",
+        dtsModifier = ".d.ts",
+        tsModifier = ".ts",
+        tsxModifier = ".tsx",
+        jsModifier = ".js",
+        jsxModifier = ".jsx",
+        jsonModifier = ".json"
     }
     enum ClassificationTypeNames {
         comment = "comment",

tests/cases/fourslash/completionEntryForClassMembers2.ts

@@ -189,18 +189,18 @@
 ////}
 
 const validInstanceMembersOfBaseClassB: ReadonlyArray<FourSlashInterface.ExpectedCompletionEntryObject> = [
-    { name: "protectedMethod", text: "(method) B.protectedMethod(): void" },
+    { name: "protectedMethod", text: "(method) B.protectedMethod(): void", kindModifiers: "protected" },
     { name: "getValue", text: "(method) B.getValue(): string | boolean" },
 ];
 const validStaticMembersOfBaseClassB: ReadonlyArray<FourSlashInterface.ExpectedCompletionEntryObject> = [
-    { name: "staticMethod", text: "(method) B.staticMethod(): void" },
+    { name: "staticMethod", text: "(method) B.staticMethod(): void", kindModifiers: "static" },
 ];
 const privateMembersOfBaseClassB: ReadonlyArray<FourSlashInterface.ExpectedCompletionEntryObject> = [
     { name: "privateMethod", text: "(method) B.privateMethod(): void" },
 ];
 const protectedPropertiesOfBaseClassB0: ReadonlyArray<FourSlashInterface.ExpectedCompletionEntryObject> = [
-    { name: "protectedMethod", text: "(method) B0.protectedMethod(): void" },
-    { name: "protectedMethod1", text: "(method) B0.protectedMethod1(): void" },
+    { name: "protectedMethod", text: "(method) B0.protectedMethod(): void", kindModifiers: "protected" },
+    { name: "protectedMethod1", text: "(method) B0.protectedMethod1(): void", kindModifiers: "protected" },
 ];
 const publicPropertiesOfBaseClassB0: ReadonlyArray<FourSlashInterface.ExpectedCompletionEntryObject> = [
     { name: "getValue", text: "(method) B0.getValue(): string | boolean" },
@@ -214,12 +214,12 @@ const validInstanceMembersOfBaseClassB0_2 : ReadonlyArray<FourSlashInterface.Exp
     publicPropertiesOfBaseClassB0[1],
 ];
 const validStaticMembersOfBaseClassB0: ReadonlyArray<FourSlashInterface.ExpectedCompletionEntryObject> = [
-    { name: "staticMethod", text: "(method) B0.staticMethod(): void" },
-    { name: "staticMethod1", text: "(method) B0.staticMethod1(): void" },
+    { name: "staticMethod", text: "(method) B0.staticMethod(): void", kindModifiers: "static" },
+    { name: "staticMethod1", text: "(method) B0.staticMethod1(): void", kindModifiers: "static" },
 ];
 const privateMembersOfBaseClassB0: ReadonlyArray<FourSlashInterface.ExpectedCompletionEntryObject> = [
-    { name: "privateMethod", text: "(method) B0.privateMethod(): void" },
-    { name: "privateMethod1", text: "(method) B0.privateMethod1(): void" },
+    { name: "privateMethod", text: "(method) B0.privateMethod(): void", kindModifiers: "private" },
+    { name: "privateMethod1", text: "(method) B0.privateMethod1(): void", kindModifiers: "private" },
 ];
 const membersOfI: ReadonlyArray<FourSlashInterface.ExpectedCompletionEntryObject> = [
     { name: "methodOfInterface", text: "(method) I.methodOfInterface(): number" },

tests/cases/fourslash/completionForStringLiteral_details.ts

@@ -18,7 +18,7 @@
 ////o["/*prop*/"];
 
 verify.completions(
-    { marker: "path", includes: { name: "other", text: "other", kind: "script" }, isNewIdentifierLocation: true },
+    { marker: "path", includes: { name: "other", text: "other", kind: "script", kindModifiers: ".ts" }, isNewIdentifierLocation: true },
     { marker: "type", exact: { name: "a", text: "a", kind: "string" } },
     {
         marker: "prop",

tests/cases/fourslash/completionInJsDocQualifiedNames.ts

@@ -11,4 +11,13 @@
 /////** @type {Foo./**/} */
 ////const x = 0;
 
-verify.completions({ marker: "", includes: { name: "T", text: "type T = number", documentation: "tee", kind: "type" } });
+verify.completions({
+    marker: "",
+    includes: {
+        name: "T",
+        text: "type T = number",
+        documentation: "tee",
+        kind: "type",
+        kindModifiers: "export,declare",
+    },
+});