Higher order this parameter inference, like microsoft#31116

jablko · jablko · commit c0ec24c7e88f · 2020-01-28T17:00:25.000-07:00
diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
@@ -24006,7 +24006,7 @@ namespace ts {
             const thisType = getThisTypeOfSignature(signature);
             if (thisType) {
                 const thisArgumentNode = getThisArgumentOfCall(node);
-                const thisArgumentType = thisArgumentNode ? checkExpression(thisArgumentNode) : voidType;
+                const thisArgumentType = thisArgumentNode ? checkExpressionWithContextualType(thisArgumentNode, thisType, context, checkMode) : voidType;
                 inferTypes(context.inferences, thisArgumentType, thisType);
             }
 

Original file line number	Diff line number	Diff line change
`@@ -24006,7 +24006,7 @@ namespace ts {`
`24006`	`24006`	`const thisType = getThisTypeOfSignature(signature);`
`24007`	`24007`	`if (thisType) {`
`24008`	`24008`	`const thisArgumentNode = getThisArgumentOfCall(node);`
`24009`		`- const thisArgumentType = thisArgumentNode ? checkExpression(thisArgumentNode) : voidType;`
	`24009`	`+ const thisArgumentType = thisArgumentNode ? checkExpressionWithContextualType(thisArgumentNode, thisType, context, checkMode) : voidType;`
`24010`	`24010`	`inferTypes(context.inferences, thisArgumentType, thisType);`
`24011`	`24011`	`}`
`24012`	`24012`