Allow trailing commas after import attributes in ImportType

src/compiler/parser.ts

@@ -4564,6 +4564,7 @@ namespace Parser {
             }
             parseExpected(SyntaxKind.ColonToken);
             attributes = parseImportAttributes(currentToken as SyntaxKind.WithKeyword | SyntaxKind.AssertKeyword, /*skipKeyword*/ true);
+            parseOptional(SyntaxKind.CommaToken);
             if (!parseExpected(SyntaxKind.CloseBraceToken)) {
                 const lastError = lastOrUndefined(parseDiagnostics);
                 if (lastError && lastError.code === Diagnostics._0_expected.code) {

tests/baselines/reference/importAttributes10.errors.txt

@@ -0,0 +1,49 @@
+b.ts(22,5): error TS1005: '}' expected.
+b.ts(23,1): error TS1128: Declaration or statement expected.
+b.ts(23,2): error TS1128: Declaration or statement expected.
+b.ts(27,18): error TS1478: Identifier or string literal expected.
+
+
+==== ./a.json (0 errors) ====
+    { "key": "value" }
+
+==== ./b.ts (4 errors) ====
+    declare global {
+        interface ImportAttributes {
+            type: "json"
+        }
+    }
+
+    export type Test1 = typeof import("./a.json", {
+      with: {
+        type: "json"
+      },
+    });
+
+    export type Test2 = typeof import("./a.json", {
+      with: {
+        type: "json",
+      }
+    });
+
+    export type Test3 = typeof import("./a.json", {
+      with: {
+        type: "json"
+      },,
+        ~
+!!! error TS1005: '}' expected.
+!!! related TS1007 b.ts:19:47: The parser expected to find a '}' to match the '{' token here.
+    });
+    ~
+!!! error TS1128: Declaration or statement expected.
+     ~
+!!! error TS1128: Declaration or statement expected.
+
+    export type Test4 = typeof import("./a.json", {
+      with: {
+        type: "json",,
+                     ~
+!!! error TS1478: Identifier or string literal expected.
+      }
+    });
+

tests/baselines/reference/importAttributes10.js

@@ -0,0 +1,41 @@
+//// [tests/cases/conformance/importAttributes/importAttributes10.ts] ////
+
+//// [a.json]
+{ "key": "value" }
+
+//// [b.ts]
+declare global {
+    interface ImportAttributes {
+        type: "json"
+    }
+}
+
+export type Test1 = typeof import("./a.json", {
+  with: {
+    type: "json"
+  },
+});
+
+export type Test2 = typeof import("./a.json", {
+  with: {
+    type: "json",
+  }
+});
+
+export type Test3 = typeof import("./a.json", {
+  with: {
+    type: "json"
+  },,
+});
+
+export type Test4 = typeof import("./a.json", {
+  with: {
+    type: "json",,
+  }
+});
+
+
+//// [b.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+;

tests/baselines/reference/importAttributes10.symbols

@@ -0,0 +1,50 @@
+//// [tests/cases/conformance/importAttributes/importAttributes10.ts] ////
+
+=== ./a.json ===
+{ "key": "value" }
+>"key" : Symbol("key", Decl(a.json, 0, 1))
+
+=== ./b.ts ===
+declare global {
+>global : Symbol(global, Decl(b.ts, 0, 0))
+
+    interface ImportAttributes {
+>ImportAttributes : Symbol(ImportAttributes, Decl(lib.es5.d.ts, --, --), Decl(b.ts, 0, 16))
+
+        type: "json"
+>type : Symbol(ImportAttributes.type, Decl(b.ts, 1, 32))
+    }
+}
+
+export type Test1 = typeof import("./a.json", {
+>Test1 : Symbol(Test1, Decl(b.ts, 4, 1))
+
+  with: {
+    type: "json"
+  },
+});
+
+export type Test2 = typeof import("./a.json", {
+>Test2 : Symbol(Test2, Decl(b.ts, 10, 3))
+
+  with: {
+    type: "json",
+  }
+});
+
+export type Test3 = typeof import("./a.json", {
+>Test3 : Symbol(Test3, Decl(b.ts, 16, 3))
+
+  with: {
+    type: "json"
+  },,
+});
+
+export type Test4 = typeof import("./a.json", {
+>Test4 : Symbol(Test4, Decl(b.ts, 22, 3))
+
+  with: {
+    type: "json",,
+  }
+});
+

tests/baselines/reference/importAttributes10.types

@@ -0,0 +1,69 @@
+//// [tests/cases/conformance/importAttributes/importAttributes10.ts] ////
+
+=== ./a.json ===
+{ "key": "value" }
+>{ "key": "value" } : { key: string; }
+>                   : ^^^^^^^^^^^^^^^^
+>"key" : string
+>      : ^^^^^^
+>"value" : "value"
+>        : ^^^^^^^
+
+=== ./b.ts ===
+declare global {
+>global : any
+>       : ^^^
+
+    interface ImportAttributes {
+        type: "json"
+>type : "json"
+>     : ^^^^^^
+    }
+}
+
+export type Test1 = typeof import("./a.json", {
+>Test1 : { key: string; }
+>      : ^^^^^^^^^^^^^^^^
+
+  with: {
+    type: "json"
+>type : any
+>     : ^^^
+
+  },
+});
+
+export type Test2 = typeof import("./a.json", {
+>Test2 : { key: string; }
+>      : ^^^^^^^^^^^^^^^^
+
+  with: {
+    type: "json",
+>type : any
+>     : ^^^
+  }
+});
+
+export type Test3 = typeof import("./a.json", {
+>Test3 : { key: string; }
+>      : ^^^^^^^^^^^^^^^^
+
+  with: {
+    type: "json"
+>type : any
+>     : ^^^
+
+  },,
+});
+
+export type Test4 = typeof import("./a.json", {
+>Test4 : { key: string; }
+>      : ^^^^^^^^^^^^^^^^
+
+  with: {
+    type: "json",,
+>type : any
+>     : ^^^
+  }
+});
+

tests/cases/conformance/importAttributes/importAttributes10.ts

@@ -0,0 +1,36 @@
+// @module: nodenext
+// @target: esnext
+// @moduleResolution: nodenext
+// @filename: ./a.json
+{ "key": "value" }
+
+// @filename: ./b.ts
+declare global {
+    interface ImportAttributes {
+        type: "json"
+    }
+}
+
+export type Test1 = typeof import("./a.json", {
+  with: {
+    type: "json"
+  },
+});
+
+export type Test2 = typeof import("./a.json", {
+  with: {
+    type: "json",
+  }
+});
+
+export type Test3 = typeof import("./a.json", {
+  with: {
+    type: "json"
+  },,
+});
+
+export type Test4 = typeof import("./a.json", {
+  with: {
+    type: "json",,
+  }
+});