WIP: allow spreads in type calls

Fixes the third part of microsoft#5453, needed to effectively type `bind` (Function.prototype), `curry` and `compose`. Depends on microsoft#17961 type calls, microsoft#17884 type spread and microsoft#18004 tuple spread. The first 2/3 are included, so changes will look more cluttered here though new changes just span 10 lines over 2 functions. Will properly test this when those are ready -- now still broken.

src/compiler/checker.ts

@@ -7626,7 +7626,13 @@ namespace ts {
 
         function getTypeFromTypeCallNode(node: TypeCallTypeNode): Type {
             const fn = typeNodeToExpression(node.type);
-            const args = map(node.arguments, typeNodeToExpression);
+            const args = map(node.arguments, (type: TypeNode) => {
+                if (type.kind === SyntaxKind.TypeSpread) {
+                    return createSpread(typeNodeToExpression((type as TypeSpreadTypeNode).type));
+                } else {
+                    return typeNodeToExpression(type);
+                }
+            });
             const callExpr = createCall(fn, node.typeArguments, args);
             return checkExpression(callExpr);
         }

src/compiler/parser.ts

@@ -4283,7 +4283,7 @@ namespace ts {
 
         function parseTypeArgumentList() {
             parseExpected(SyntaxKind.OpenParenToken);
-            const result = parseDelimitedList(ParsingContext.TypeArguments, parseType);
+            const result = parseDelimitedList(ParsingContext.TypeArguments, parseTupleElement);
             parseExpected(SyntaxKind.CloseParenToken);
             return result;
         }

tests/baselines/reference/typeCallSpreads.errors.txt

@@ -0,0 +1,12 @@
+tests/cases/compiler/typeCallSpreads.ts(2,13): error TS1005: ')' expected.
+tests/cases/compiler/typeCallSpreads.ts(2,19): error TS1005: ';' expected.
+
+
+==== tests/cases/compiler/typeCallSpreads.ts (2 errors) ====
+    type Fn = <T>(v: T) => T;
+    type a = Fn(...[1]);
+                ~~~
+!!! error TS1005: ')' expected.
+                      ~
+!!! error TS1005: ';' expected.
+

tests/baselines/reference/typeCallSpreads.js

@@ -0,0 +1,8 @@
+//// [typeCallSpreads.ts]
+type Fn = <T>(v: T) => T;
+type a = Fn(...[1]);
+
+
+//// [typeCallSpreads.js]
+[1];
+;

tests/cases/compiler/typeCallSpreads.ts

@@ -0,0 +1,2 @@
+type Fn = <T>(v: T) => T;
+type a = Fn(...[1]);