node_modules/tsconfig-paths/test/config-loader-tests.ts

import { assert } from "chai";
import {
  configLoader,
  loadConfig,
  ConfigLoaderFailResult,
  ConfigLoaderSuccessResult
} from "../src/config-loader";
import { join } from "path";

describe("config-loader", (): void => {
  it("should use explicitParams when set", () => {
    const result = configLoader({
      explicitParams: {
        baseUrl: "/foo/bar",
        paths: {
          asd: ["asd"]
        }
      },
      cwd: "/baz"
    });

    const successResult = result as ConfigLoaderSuccessResult;
    assert.equal(successResult.resultType, "success");
    assert.equal(successResult.absoluteBaseUrl, "/foo/bar");
    assert.equal(successResult.paths["asd"][0], "asd");
  });

  it("should use explicitParams when set and add cwd when path is relative", () => {
    const result = configLoader({
      explicitParams: {
        baseUrl: "bar/",
        paths: {
          asd: ["asd"]
        }
      },
      cwd: "/baz"
    });

    const successResult = result as ConfigLoaderSuccessResult;
    assert.equal(successResult.resultType, "success");
    assert.equal(successResult.absoluteBaseUrl, join("/baz", "bar/"));
  });

  it("should fallback to tsConfigLoader when explicitParams is not set", () => {
    const result = configLoader({
      explicitParams: undefined,
      cwd: "/baz",
      // tslint:disable-next-line:no-any
      tsConfigLoader: (_: any) => ({
        tsConfigPath: "/baz/tsconfig.json",
        baseUrl: "./src",
        paths: {}
      })
    });

    const successResult = result as ConfigLoaderSuccessResult;
    assert.equal(successResult.resultType, "success");
    assert.equal(successResult.absoluteBaseUrl, join("/baz", "src"));
  });

  it("should show an error message when baseUrl is missing", () => {
    const result = configLoader({
      explicitParams: undefined,
      cwd: "/baz",
      // tslint:disable-next-line:no-any
      tsConfigLoader: (_: any) => ({
        tsConfigPath: "/baz/tsconfig.json",
        baseUrl: undefined,
        paths: {}
      })
    });

    const failResult = result as ConfigLoaderFailResult;
    assert.equal(failResult.resultType, "failed");
    assert.isTrue(failResult.message.indexOf("baseUrl") > -1);
  });

  it("should presume cwd to be a tsconfig file when loadConfig is called with absolute path to tsconfig.json", () => {
    // using tsconfig-named.json to ensure that future changes to fix
    // https://github.com/dividab/tsconfig-paths/issues/31
    // do not pass this test case just because of a directory walk looking
    // for tsconfig.json
    const configFile = join(__dirname, "tsconfig-named.json");
    const result = loadConfig(configFile);

    const successResult = result as ConfigLoaderSuccessResult;
    assert.equal(successResult.resultType, "success");
    assert.equal(successResult.configFileAbsolutePath, configFile);
  });
});