merge-map.js

import _mergeSourceMap from "../lib/transformation/file/merge-map.js";
const mergeSourceMap = _mergeSourceMap.default;

const inputMap = {
  file: "file.js",
  mappings: [],
  names: [],
  sources: ["file.ts"],
  version: 3,
};

const outputMap = {
  file: "file.transpiled.js",
  mappings: [],
  names: [],
  sources: ["file.js"],
  version: 3,
};

describe("merge-map", () => {
  it("returns a plain js object", () => {
    const map = mergeSourceMap(inputMap, outputMap, "file.transpiled.js");
    const proto = Object.getPrototypeOf(map) ?? Object.getPrototypeOf({});
    expect(typeof map).toBe("object");
    expect(Object.prototype.toString.call(map)).toBe("object [object]");
    expect(Object.getPrototypeOf(proto)).toBeNull();
  });
});