From d3ba03f75649289aaa7562d452a8ebdf5ea292e0 Mon Sep 17 00:00:00 2001
From: Junyoung Choi <fluke8259@gmail.com>
Date: Tue, 11 Dec 2018 13:48:40 +0900
Subject: [PATCH] Discard context type checking

---
 types/unist-util-is/index.d.ts             |  6 +++---
 types/unist-util-is/unist-util-is-tests.ts | 12 ++----------
 2 files changed, 5 insertions(+), 13 deletions(-)

diff --git a/types/unist-util-is/index.d.ts b/types/unist-util-is/index.d.ts
index ae92217c6e..82e6e1fdc8 100644
--- a/types/unist-util-is/index.d.ts
+++ b/types/unist-util-is/index.d.ts
@@ -14,8 +14,8 @@ declare namespace unistUtilIs {
      * @param index Position of node in parent
      * @param parent Parent of node
      */
-    type TestFunction<C = {}> = (this: C, node: unknown, index?: number, parent?: Unist.Parent) => boolean | void;
-    type Test<C = {}> = TestFunction<C> | Partial<Unist.Node> | string | null;
+    type TestFunction = (node: unknown, index?: number, parent?: Unist.Parent) => boolean | void;
+    type Test = TestFunction | Partial<Unist.Node> | string | null;
 }
 
 /**
@@ -31,6 +31,6 @@ declare namespace unistUtilIs {
  * @param context Context object to invoke `test` with
  * @returns Whether test passed and `node` is a `Node` (object with `type` set to non-empty `string`).
  */
-declare function unistUtilIs<C = {}>(test: unistUtilIs.Test<C> | Array<unistUtilIs.Test<C>>, node: unknown, index?: number, parent?: Unist.Parent, context?: any): boolean;
+declare function unistUtilIs(test: unistUtilIs.Test | unistUtilIs.Test[], node: unknown, index?: number, parent?: Unist.Parent, context?: any): boolean;
 
 export = unistUtilIs;
diff --git a/types/unist-util-is/unist-util-is-tests.ts b/types/unist-util-is/unist-util-is-tests.ts
index 4d355c90ec..9f3eecc680 100644
--- a/types/unist-util-is/unist-util-is-tests.ts
+++ b/types/unist-util-is/unist-util-is-tests.ts
@@ -20,15 +20,7 @@ is(test, node);
 is(test, node, 4, parent);
 is(test, node, 5, parent);
 
-interface TestContext {
-  some: string;
-}
-function testWithContext(this: TestContext, node: unknown) {}
-is<TestContext>(testWithContext, node);
+function testFunc(node: unknown) {}
+is(testFunc, node);
 
 const wrongTestFunc: is.TestFunction = (node: unknown, n: string) => {}; // $ExpectError
-
-interface OtherTestContext {
-  some: number;
-}
-is<OtherTestContext>(testWithContext, node); // $ExpectError