Merge env-standalone to babel-standalone (#10821)

* feat: add babel-preset-env to babel-standalone

* chore: copy preset-env-standalone test

* polish: tune warning message when babel-preset-env-standalone is loaded

packages/babel-standalone/test/babel.js

@@ -110,6 +110,61 @@
       ).toThrow(/Invalid plugin specified in Babel options: "lolfail"/);
     });
 
+    describe("env preset", () => {
+      it("works w/o targets", () => {
+        const output = Babel.transform("const a = 1;", {
+          sourceType: "script",
+          presets: ["env"],
+        }).code;
+        expect(output).toBe("var a = 1;");
+      });
+
+      it("doesn't transpile `const` with chrome 60", () => {
+        const output = Babel.transform("const a = 1;", {
+          sourceType: "script",
+          presets: [
+            [
+              "env",
+              {
+                targets: {
+                  chrome: 60,
+                },
+              },
+            ],
+          ],
+        }).code;
+        expect(output).toBe("const a = 1;");
+      });
+
+      it("transpiles `const` with chrome 60 and preset-es2015", () => {
+        const output = Babel.transform("const a = 1;", {
+          sourceType: "script",
+          presets: [
+            [
+              "env",
+              {
+                targets: {
+                  chrome: 60,
+                },
+              },
+            ],
+            "es2015",
+          ],
+        }).code;
+        expect(output).toBe("var a = 1;");
+      });
+
+      it("uses transform-new-targets plugin", () => {
+        const output = Babel.transform("function Foo() {new.target}", {
+          sourceType: "script",
+          presets: ["env"],
+        }).code;
+        expect(output).toBe(
+          "function Foo() {\n  this instanceof Foo ? this.constructor : void 0;\n}",
+        );
+      });
+    });
+
     describe("custom plugins and presets", () => {
       const lolizer = () => ({
         visitor: {