Higher order this parameter inference, like microsoft#31116

jablko · jablko · commit 0fa0a839d11b · 2020-02-11T11:50:38.000-07:00
diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
@@ -24179,7 +24179,7 @@ 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
`@@ -24179,7 +24179,7 @@ namespace ts {`
`24179`	`24179`	`const thisType = getThisTypeOfSignature(signature);`
`24180`	`24180`	`if (thisType) {`
`24181`	`24181`	`const thisArgumentNode = getThisArgumentOfCall(node);`
`24182`		`- const thisArgumentType = thisArgumentNode ? checkExpression(thisArgumentNode) : voidType;`
	`24182`	`+ const thisArgumentType = thisArgumentNode ? checkExpressionWithContextualType(thisArgumentNode, thisType, context, checkMode) : voidType;`
`24183`	`24183`	`inferTypes(context.inferences, thisArgumentType, thisType);`
`24184`	`24184`	`}`
`24185`	`24185`