config-ts.js

import { loadPartialConfigSync } from "../lib/index.js";
import path from "path";
import { fileURLToPath } from "url";
import { createRequire } from "module";
import semver from "semver";

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const require = createRequire(import.meta.url);

// We skip older versions of node testing for two reasons.
// 1. ts-node does not support the old version of node.
// 2. In the old version of node, jest has been registered in `require.extensions`, which will cause babel to disable the transforming as expected.

describe("@babel/core config with ts [dummy]", () => {
  it("dummy", () => {
    expect(1).toBe(1);
  });
});

semver.gte(process.version, "12.0.0")
  ? describe
  : describe.skip("@babel/core config with ts", () => {
      it("should work with simple .cts", () => {
        const config = loadPartialConfigSync({
          configFile: path.join(
            __dirname,
            "fixtures/config-ts/simple-cts/babel.config.cts",
          ),
        });

        expect(config.options.targets).toMatchInlineSnapshot(`
      Object {
        "node": "12.0.0",
      }
    `);
      });

      it("should throw with invalid .ts register", () => {
        require.extensions[".ts"] = () => {
          throw new Error("Not support .ts.");
        };
        expect(() => {
          loadPartialConfigSync({
            configFile: path.join(
              __dirname,
              "fixtures/config-ts/invalid-cts-register/babel.config.cts",
            ),
          });
        }).toThrow(/Unexpected identifier.*/);
        delete require.extensions[".ts"];
      });

      it("should work with ts-node", async () => {
        const service = eval("import('ts-node')").register({
          experimentalResolver: true,
          compilerOptions: {
            module: "CommonJS",
          },
        });
        service.enabled(true);

        require(path.join(
          __dirname,
          "fixtures/config-ts/simple-cts-with-ts-node/babel.config.cts",
        ));

        const config = loadPartialConfigSync({
          configFile: path.join(
            __dirname,
            "fixtures/config-ts/simple-cts-with-ts-node/babel.config.cts",
          ),
        });

        service.enabled(false);

        expect(config.options.targets).toMatchInlineSnapshot(`
      Object {
        "node": "12.0.0",
      }
    `);
      });
    });