fix: keep every published file reachable, and test all four build artifacts

Two follow-ups to the dual packaging change (#628), found while running a
consumer-facing regression sweep against published 2.14.1.

An exports map is a closed list. Before #628 bowser had no exports map, so
every published file was reachable by subpath; afterwards LICENSE, README.md
and index.d.ts resolved to ERR_PACKAGE_PATH_NOT_EXPORTED. Nothing in the
documented API regressed, but `/// <reference types="bowser/index.d.ts" />`
and tooling that resolves the license by specifier both did. Add the four
non-code files to the map so the published surface matches 2.14.1 exactly,
and assert it in the package smoke test (25 -> 29 checks).

The acceptance suite asserted src/bowser.js and es5.js against the UA corpus
but not bundled.js or bowser.mjs. bowser.mjs is what the `import` condition
resolves to, so it is the file every modern ESM and bundler consumer runs,
and a build regression confined to it would have kept CI green. Assert all
four artifacts against the spec instead.

Verified by injecting a Chrome-parsing regression into bowser.mjs and into
bundled.js separately (each turns the suite red, labelled by artifact), and
by running the new smoke assertions against a pre-fix tarball (exit 1) and
this one (exit 0) on Node 12.16, 14, 18, 20 and 22.

package.json

@@ -71,6 +71,10 @@
     "./src/parser-platforms": "./src/parser-platforms.js",
     "./src/utils.js": "./src/utils.js",
     "./src/utils": "./src/utils.js",
+    "./LICENSE": "./LICENSE",
+    "./README.md": "./README.md",
+    "./index.d.ts": "./index.d.ts",
+    "./index.d.mts": "./index.d.mts",
     "./package.json": "./package.json"
   },
   "repository": {

test/acceptance/test-list-of-ua.js

@@ -2,7 +2,41 @@ import test from 'ava';
 import yaml from 'yamljs';
 import path from 'path';
 import Bowser from '../../src/bowser';
-import BowserBuild from '../../es5';
+import BowserEs5 from '../../es5';
+import BowserBundled from '../../bundled';
+import BowserMjs from '../../bowser.mjs';
+
+/**
+ * Every published JS artifact is built from `src/` through a different
+ * pipeline — raw ES modules, babel + terser UMD, UMD with core-js baked in,
+ * and the rolldown ESM build. A regression in any one of them ships silently
+ * unless each is asserted against the spec independently.
+ *
+ * `bowser.mjs` matters most: it is what the `import` condition of the exports
+ * map resolves to, so it is the file every modern ESM and bundler consumer
+ * actually runs. Testing only `src/` and `es5.js` leaves it uncovered.
+ *
+ * These are build outputs, so `pnpm build` has to run before `pnpm test`.
+ * Importing `bowser.mjs` from this CommonJS test file relies on Node's
+ * require(esm) support (Node >= 22.12) — the build toolchain already requires
+ * a newer Node than that, so anything able to produce these files can load them.
+ */
+const artifacts = [
+  ['src/bowser.js', Bowser],
+  ['es5.js', BowserEs5],
+  ['bundled.js', BowserBundled],
+  ['bowser.mjs', BowserMjs],
+];
+
+// A missing build output fails at import with a plain "Cannot find module".
+// This catches the quieter failure: an artifact that loads but is not the
+// Bowser class — a broken UMD wrapper or a lost CJS interop unwrap would
+// otherwise make every assertion below vacuous instead of failing.
+artifacts.forEach(([name, artifact]) => {
+  if (typeof artifact !== 'function' || typeof artifact.parse !== 'function') {
+    throw new Error(`${name} did not load as the Bowser class — run \`pnpm build\` first`);
+  }
+});
 
 const listOfUA = yaml.load(path.join(__dirname, 'useragentstrings.yml'));
 
@@ -11,11 +45,10 @@ const browserNames = Object.keys(listOfUA);
 browserNames.forEach((browserName) => {
   listOfUA[browserName].forEach((browser, index) => {
     test(`Test ${browserName} ${index}`, (t) => {
-      const parsed = Bowser.parse(browser.ua);
-      const parsedBuild = BowserBuild.parse(browser.ua);
-      t.deepEqual(parsed, browser.spec, `${browser.ua}`);
-      t.deepEqual(parsedBuild, browser.spec, `${browser.ua}`);
-      t.is(parsed.browser.name, browserName, `${browser.ua}`);
+      artifacts.forEach(([name, artifact]) => {
+        t.deepEqual(artifact.parse(browser.ua), browser.spec, `${name}: ${browser.ua}`);
+      });
+      t.is(Bowser.parse(browser.ua).browser.name, browserName, `${browser.ua}`);
     });
   });
 });

test/package/assertions.cjs

@@ -93,6 +93,19 @@ check('require.resolve("bowser/package.json") works', function () {
   assert.ok(fs.existsSync(require.resolve('bowser/package.json')));
 });
 
+// Before the exports map existed, *every* published file was reachable by
+// subpath. An exports map is a closed list, so anything published but not
+// enumerated silently becomes ERR_PACKAGE_PATH_NOT_EXPORTED. These four are
+// not code, but they did resolve on every previous version — license and
+// attribution tooling and `/// <reference types="bowser/index.d.ts" />`
+// consumers can all depend on them.
+['bowser/LICENSE', 'bowser/README.md', 'bowser/index.d.ts', 'bowser/index.d.mts']
+  .forEach(function (id) {
+    check('resolves "' + id + '"', function () {
+      assert.ok(fs.existsSync(require.resolve(id)));
+    });
+  });
+
 // --- The published manifest ------------------------------------------------
 
 check('main/browser/module/types fields are unchanged', function () {