diff --git a/tests/cases/fourslash/codeFixChangeJSDocSyntax1.ts b/tests/cases/fourslash/codeFixChangeJSDocSyntax1.ts
new file mode 100644
index 00000000000..93107ef669b
--- /dev/null
+++ b/tests/cases/fourslash/codeFixChangeJSDocSyntax1.ts
@@ -0,0 +1,4 @@
+/// <reference path='fourslash.ts' />
+//// var x: [|?|] = 12;
+
+verify.rangeAfterCodeFix("any");
diff --git a/tests/cases/fourslash/completionInJSDocFunctionNew.ts b/tests/cases/fourslash/completionInJSDocFunctionNew.ts
new file mode 100644
index 00000000000..9e19964cd25
--- /dev/null
+++ b/tests/cases/fourslash/completionInJSDocFunctionNew.ts
@@ -0,0 +1,10 @@
+
+///<reference path="fourslash.ts" />
+// @allowJs: true
+// @Filename: Foo.js
+/////** @type {function (new: string, string): string} */
+////var f = function (s) { return /**/; }
+
+goTo.marker();
+verify.completionListCount(115);
+verify.completionListContains('new', 'new', '', 'keyword');
diff --git a/tests/cases/fourslash/completionInJSDocFunctionThis.ts b/tests/cases/fourslash/completionInJSDocFunctionThis.ts
new file mode 100644
index 00000000000..3fe02825d4c
--- /dev/null
+++ b/tests/cases/fourslash/completionInJSDocFunctionThis.ts
@@ -0,0 +1,9 @@
+///<reference path="fourslash.ts" />
+// @allowJs: true
+// @Filename: Foo.js
+/////** @type {function (this: string, string): string} */
+////var f = function (s) { return /**/; }
+
+goTo.marker();
+verify.completionListCount(115);
+verify.completionListContains('this');
diff --git a/tests/cases/fourslash/findAllReferencesJSDocFunctionNew.ts b/tests/cases/fourslash/findAllReferencesJSDocFunctionNew.ts
new file mode 100644
index 00000000000..e75040d1f77
--- /dev/null
+++ b/tests/cases/fourslash/findAllReferencesJSDocFunctionNew.ts
@@ -0,0 +1,9 @@
+///<reference path="fourslash.ts" />
+// @allowJs: true
+// @Filename: Foo.js
+/////** @type {function ([|new|]: string, string): string} */
+////var f;
+
+const [a0] = test.ranges();
+// should be: verify.referenceGroups([a0], [{ definition: "new", ranges: [a0] }]);
+verify.referenceGroups([a0], undefined);
diff --git a/tests/cases/fourslash/findAllReferencesJSDocFunctionThis.ts b/tests/cases/fourslash/findAllReferencesJSDocFunctionThis.ts
new file mode 100644
index 00000000000..1f00e9f5647
--- /dev/null
+++ b/tests/cases/fourslash/findAllReferencesJSDocFunctionThis.ts
@@ -0,0 +1,11 @@
+///<reference path="fourslash.ts" />
+// @allowJs: true
+// @Filename: Foo.js
+/////** @type {function (this: string, string): string} */
+////var f = function (s) { return [|this|] + s; }
+
+const [a0] = test.ranges();
+// should be: verify.referenceGroups([a0, a1], [{ definition: "this", ranges: [a0] }]);
+
+// but is currently
+verify.referenceGroups([], undefined);
diff --git a/tests/cases/fourslash/quickInfoJSDocFunctionNew.ts b/tests/cases/fourslash/quickInfoJSDocFunctionNew.ts
new file mode 100644
index 00000000000..5fed7d9a39a
--- /dev/null
+++ b/tests/cases/fourslash/quickInfoJSDocFunctionNew.ts
@@ -0,0 +1,8 @@
+///<reference path="fourslash.ts" />
+// @allowJs: true
+// @Filename: Foo.js
+/////** @type {function (new: string, string): string} */
+////var f/**/;
+
+goTo.marker();
+verify.quickInfoIs('var f: new (arg1: string) => string');
diff --git a/tests/cases/fourslash/quickInfoJSDocFunctionThis.ts b/tests/cases/fourslash/quickInfoJSDocFunctionThis.ts
new file mode 100644
index 00000000000..5568ff829f1
--- /dev/null
+++ b/tests/cases/fourslash/quickInfoJSDocFunctionThis.ts
@@ -0,0 +1,9 @@
+
+///<reference path="fourslash.ts" />
+// @allowJs: true
+// @Filename: Foo.js
+/////** @type {function (this: string, string): string} */
+////var f/**/ = function (s) { return s; }
+
+goTo.marker();
+verify.quickInfoIs('var f: (this: string, arg1: string) => string');