const assert = require("assert");
const mock = require("mock-require");
const Babel = require("@babel/standalone/babel");
mock("Babel", Babel);
require("../babel-preset-env");

describe("babel-preset-env-standalone", () => {
  it("works w/o targets", () => {
    const output = Babel.transform("const a = 1;", {
      presets: ["env"],
    }).code;
    assert.equal(output, "var a = 1;");
  });

  it("doesn't transpile `const` with chrome 60", () => {
    const output = Babel.transform("const a = 1;", {
      presets: [
        [
          "env",
          {
            targets: {
              chrome: 60,
            },
          },
        ],
      ],
    }).code;
    assert.equal(output, "const a = 1;");
  });

  it("transpiles `const` with chrome 60 and preset-es2015", () => {
    const output = Babel.transform("const a = 1;", {
      presets: [
        [
          "env",
          {
            targets: {
              chrome: 60,
            },
          },
        ],
        "es2015",
      ],
    }).code;
    assert.equal(output, "var a = 1;");
  });

  it("uses transform-new-targets plugin", () => {
    const output = Babel.transform("function Foo() {new.target}", {
      presets: ["env"],
    }).code;
    assert.equal(
      output,
      "function Foo() {\n  this instanceof Foo ? this.constructor : void 0;\n}",
    );
  });
});