Add tests for createTypeAnnotationBasedOnTypeof

packages/babel-types/test/builders/flow/__snapshots__/createTypeAnnotationBasedOnTypeof.js.snap

@@ -0,0 +1,58 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`builders flow createTypeAnnotationBasedOnTypeof function 1`] = `
+Object {
+  "id": Object {
+    "name": "Function",
+    "type": "Identifier",
+  },
+  "type": "GenericTypeAnnotation",
+  "typeParameters": null,
+}
+`;
+
+exports[`builders flow createTypeAnnotationBasedOnTypeof number 1`] = `
+Object {
+  "type": "NumberTypeAnnotation",
+}
+`;
+
+exports[`builders flow createTypeAnnotationBasedOnTypeof object 1`] = `
+Object {
+  "id": Object {
+    "name": "Object",
+    "type": "Identifier",
+  },
+  "type": "GenericTypeAnnotation",
+  "typeParameters": null,
+}
+`;
+
+exports[`builders flow createTypeAnnotationBasedOnTypeof string 1`] = `
+Object {
+  "type": "StringTypeAnnotation",
+}
+`;
+
+exports[`builders flow createTypeAnnotationBasedOnTypeof symbol 1`] = `
+Object {
+  "id": Object {
+    "name": "Symbol",
+    "type": "Identifier",
+  },
+  "type": "GenericTypeAnnotation",
+  "typeParameters": null,
+}
+`;
+
+exports[`builders flow createTypeAnnotationBasedOnTypeof true 1`] = `
+Object {
+  "type": "BooleanTypeAnnotation",
+}
+`;
+
+exports[`builders flow createTypeAnnotationBasedOnTypeof undefined 1`] = `
+Object {
+  "type": "VoidTypeAnnotation",
+}
+`;

packages/babel-types/test/builders/flow/createTypeAnnotationBasedOnTypeof.js

@@ -0,0 +1,31 @@
+import { createTypeAnnotationBasedOnTypeof } from "@babel/types";
+
+describe("builders", function() {
+  describe("flow", function() {
+    describe("createTypeAnnotationBasedOnTypeof", function() {
+      const values = {
+        string: typeof "string",
+        number: typeof 123,
+        true: typeof true,
+        object: typeof {},
+        undefined: typeof undefined,
+        function: typeof function() {},
+        symbol: typeof Symbol(),
+      };
+
+      for (const name in values) {
+        const value = values[name];
+        it(name, function() {
+          const result = createTypeAnnotationBasedOnTypeof(value);
+          expect(result).toMatchSnapshot();
+        });
+      }
+
+      it("invalid", function() {
+        expect(() =>
+          createTypeAnnotationBasedOnTypeof("thisdoesnotexist"),
+        ).toThrow(Error);
+      });
+    });
+  });
+});