Test generics in object methods in TS

as proposed in the following PR: prettier#5824

Note that this test is not expected to succeed without code changes
when using an outdated version of the following dependency:
@typescript-eslint/typescript-estree

Co-authored-by: Jed Fox <git@twopointzero.us>
Co-authored-by: Christopher J. Brody <chris@brody.consulting>

tests/typescript_generic/__snapshots__/jsfmt.spec.js.snap

@@ -0,0 +1,23 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`object-method.ts 1`] = `
+====================================options=====================================
+parsers: ["typescript"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+export default {
+  load<K, T>(k: K, t: T) {
+    return {k, t};
+  }
+}
+
+=====================================output=====================================
+export default {
+  load<K, T>(k: K, t: T) {
+    return { k, t };
+  }
+};
+
+================================================================================
+`;

tests/typescript_generic/jsfmt.spec.js

@@ -0,0 +1 @@
+run_spec(__dirname, ["typescript"]);

tests/typescript_generic/object-method.ts

@@ -0,0 +1,5 @@
+export default {
+  load<K, T>(k: K, t: T) {
+    return {k, t};
+  }
+}