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node_modules/@babel/standalone/test/babel.js

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+import { createRequire } from "module";
+const require = createRequire(import.meta.url);
+
+// Basic smoke tests for @babel/standalone
+describe("@babel/standalone", () => {
+  let Babel;
+  beforeAll(() => {
+    Babel = require("../babel.js");
+  });
+
+  it("handles the es2015-no-commonjs preset", () => {
+    const output = Babel.transform('const getMessage = () => "Hello World"', {
+      presets: ["es2015-no-commonjs"],
+    }).code;
+    expect(output).toBe(
+      "var getMessage = function getMessage() {\n" +
+        '  return "Hello World";\n' +
+        "};",
+    );
+  });
+  it("handles the es2015-loose preset", () => {
+    const output = Babel.transform("class A {}", {
+      sourceType: "script",
+      presets: ["es2015-loose"],
+    }).code;
+    expect(output).toBe('var A = function A() {\n  "use strict";\n};');
+  });
+  it("handles the typescript preset", () => {
+    const output = Babel.transform("var a: string;", {
+      presets: [["typescript", { allExtensions: true }]],
+    }).code;
+    expect(output).toBe("var a;");
+  });
+  it("handles the flow preset", () => {
+    const output = Babel.transform("var a: string;", {
+      presets: ["flow"],
+    }).code;
+    expect(output).toBe("var a;");
+  });
+  it("can translate simple ast", () => {
+    const ast = {
+      type: "Program",
+      start: 0,
+      end: 2,
+      directives: [],
+      body: [
+        {
+          type: "ExpressionStatement",
+          start: 0,
+          end: 1,
+          expression: {
+            type: "NumericLiteral",
+            start: 0,
+            end: 2,
+            value: 42,
+            raw: "42",
+          },
+        },
+      ],
+      sourceType: "script",
+    };
+    const output = Babel.transformFromAst(ast, "42", {
+      presets: ["es2015"],
+    }).code;
+    expect(output).toBe("42;");
+  });
+
+  it("handles the react preset", () => {
+    const output = Babel.transform(
+      "const someDiv = <div>{getMessage()}</div>",
+      {
+        presets: [["react", { runtime: "classic" }]],
+      },
+    ).code;
+    expect(output).toBe(
+      'const someDiv = /*#__PURE__*/React.createElement("div", null, getMessage());',
+    );
+  });
+
+  it("handles presets with options", () => {
+    const output = Babel.transform("export let x", {
+      presets: [["es2015", { modules: false }]],
+    }).code;
+    expect(output).toBe("export var x;");
+  });
+
+  it("handles specifying a plugin by name", () => {
+    const output = Babel.transform('const getMessage = () => "Hello World"', {
+      plugins: ["transform-arrow-functions"],
+    }).code;
+    // Transforms arrow syntax but NOT "const".
+    expect(output).toBe(
+      "const getMessage = function () {\n" + '  return "Hello World";\n' + "};",
+    );
+  });
+
+  it("handles plugins with options", () => {
+    const output = Babel.transform("`${x}`", {
+      plugins: [["transform-template-literals", { loose: true }]],
+    }).code;
+    expect(output).toBe('"" + x;');
+  });
+
+  it("throws on invalid preset name", () => {
+    expect(() => Babel.transform("var foo", { presets: ["lolfail"] })).toThrow(
+      /Invalid preset specified in Babel options: "lolfail"/,
+    );
+  });
+
+  it("throws on invalid plugin name", () => {
+    expect(() => Babel.transform("var foo", { plugins: ["lolfail"] })).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", { targets: { browsers: "ie 6" } }]],
+      }).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", { targets: { browsers: "ie 6" } }]],
+      }).code;
+      expect(output).toBe(
+        "function Foo() {\n  this instanceof Foo ? this.constructor : void 0;\n}",
+      );
+    });
+
+    it("useBuiltIns works", () => {
+      const output = Babel.transform("[].includes(2)", {
+        sourceType: "module",
+        targets: { ie: 11 },
+        presets: [["env", { useBuiltIns: "usage", corejs: 3, modules: false }]],
+      }).code;
+
+      expect(output).toMatchInlineSnapshot(`
+        "import \\"core-js/modules/es.array.includes.js\\";
+        [].includes(2);"
+      `);
+    });
+
+    it("regenerator works", () => {
+      const output = Babel.transform("function* fn() {}", {
+        sourceType: "module",
+        targets: { ie: 11 },
+        presets: ["env"],
+      }).code;
+
+      expect(output).toMatch("regeneratorRuntime().mark(fn)");
+    });
+  });
+
+  describe("custom plugins and presets", () => {
+    const lolizer = () => ({
+      visitor: {
+        Identifier(path) {
+          path.node.name = "LOL";
+        },
+      },
+    });
+
+    it("allows custom plugins to be registered", () => {
+      Babel.registerPlugin("lolizer", lolizer);
+      const output = Babel.transform(
+        "function helloWorld() { alert(hello); }",
+        { plugins: ["lolizer"] },
+      );
+      expect(output.code).toBe(`function LOL() {
+  LOL(LOL);
+}`);
+    });
+
+    it("allows custom presets to be registered", () => {
+      Babel.registerPreset("lulz", { plugins: [lolizer] });
+      const output = Babel.transform(
+        "function helloWorld() { alert(hello); }",
+        { presets: ["lulz"] },
+      );
+      expect(output.code).toBe(`function LOL() {
+  LOL(LOL);
+}`);
+    });
+  });
+
+  describe("regressions", () => {
+    it("#11534 - supports quantifiers in unicode regexps", () => {
+      expect(() =>
+        Babel.transform("/a*/u", { presets: ["es2015"] }),
+      ).not.toThrow();
+    });
+    it("#11628 - supports stage-0 passing importAssertionsVersion to stage-1", () => {
+      expect(() =>
+        Babel.transform("const getMessage = () => 'Hello World'", {
+          presets: [["stage-0", { decoratorsVersion: "legacy" }]],
+        }),
+      ).not.toThrow();
+    });
+    it("#11897 - [...map.keys()] in Babel source should be transformed correctly", () => {
+      expect(() =>
+        Babel.transform("for (let el of []) { s => el }", {
+          plugins: ["transform-block-scoping"],
+        }),
+      ).not.toThrow();
+    });
+    it("#12815 - unicode property letter short alias should be transformed", () => {
+      expect(() =>
+        Babel.transform("/\\p{L}/u", {
+          plugins: ["proposal-unicode-property-regex"],
+        }),
+      ).not.toThrow();
+    });
+    it("#14425 - numeric separators should be parsed correctly", () => {
+      expect(() => Babel.transform("1_1", {})).not.toThrow();
+    });
+  });
+});