test.mjs

/* eslint-disable line-comment-position, no-new-func, no-undefined */

import { createRequire } from 'module';
import * as os from 'os';
import * as path from 'path';
import { fileURLToPath } from 'url';

import { nodeResolve } from '@rollup/plugin-node-resolve';
import test from 'ava';
import { getLocator } from 'locate-character';
import { rollup } from 'rollup';
import { install } from 'source-map-support';

import {
  commonjs,
  executeBundle,
  getCodeFromBundle,
  normalizePathSlashes
} from './helpers/util.mjs';

const require = createRequire(import.meta.url);

const { peerDependencies } = require('../package.json');

const { testBundle } = require('../../../util/test.js');

install();
test.beforeEach(() => process.chdir(fileURLToPath(new URL('.', import.meta.url))));

const loader = (modules) => {
  return {
    load(id) {
      if (Object.hasOwnProperty.call(modules, id)) {
        return modules[id];
      }
      return null;
    },
    resolveId(id) {
      if (Object.hasOwnProperty.call(modules, id)) {
        return id;
      }
      return null;
    }
  };
};

test('Rollup peer dependency has correct format', (t) => {
  t.regex(peerDependencies.rollup, /^\^\d+\.\d+\.\d+(\|\|\^\d+\.\d+\.\d+)*$/);
});

test('exposes plugin version', (t) => {
  const plugin = commonjs();
  t.regex(plugin.version, /^\d+\.\d+\.\d+/);
});

// most of these should be moved over to function...
test('generates a sourcemap', async (t) => {
  const bundle = await rollup({
    input: 'fixtures/samples/sourcemap/main.js',
    plugins: [commonjs({ sourceMap: true })]
  });

  const {
    output: [{ code, map }]
  } = await bundle.generate({
    exports: 'auto',
    format: 'cjs',
    sourcemap: true,
    sourcemapFile: path.resolve('bundle.js')
  });

  // source-map uses the presence of fetch to detect browser environments which
  // breaks in Node 18
  const { fetch } = global;
  delete global.fetch;
  const { SourceMapConsumer } = await import('source-map');
  const smc = await new SourceMapConsumer(map);
  global.fetch = fetch;

  const locator = getLocator(code, { offsetLine: 1 });
  let generatedLoc = locator('42');
  let loc = smc.originalPositionFor(generatedLoc); // 42
  t.is(loc.source, 'fixtures/samples/sourcemap/foo.js');
  t.is(loc.line, 1);
  t.is(loc.column, 15);

  generatedLoc = locator('log');
  loc = smc.originalPositionFor(generatedLoc); // log
  t.is(loc.source, 'fixtures/samples/sourcemap/main.js');
  t.is(loc.line, 3);
  t.is(loc.column, 8);
});

test('supports an array of multiple entry points', async (t) => {
  const bundle = await rollup({
    input: [
      'fixtures/samples/multiple-entry-points/b.js',
      'fixtures/samples/multiple-entry-points/c.js'
    ],
    plugins: [commonjs()]
  });

  const { output } = await bundle.generate({
    exports: 'auto',
    format: 'cjs',
    chunkFileNames: '[name].js'
  });
  if (Array.isArray(output)) {
    t.is(output.length, 3);
    t.truthy(output.find(({ fileName }) => fileName === 'b.js'));
    t.truthy(output.find(({ fileName }) => fileName === 'c.js'));
  } else {
    t.is(Object.keys(output).length, 3);
    t.is('b.js' in output, true);
    t.is('c.js' in output, true);
  }
});

test('supports an object of multiple entry points', async (t) => {
  const bundle = await rollup({
    input: {
      b: require.resolve('./fixtures/samples/multiple-entry-points/b.js'),
      c: require.resolve('./fixtures/samples/multiple-entry-points/c.js')
    },
    plugins: [nodeResolve(), commonjs()]
  });

  const { output } = await bundle.generate({
    exports: 'auto',
    format: 'cjs',
    chunkFileNames: '[name].js'
  });

  if (Array.isArray(output)) {
    t.is(output.length, 3);
    t.truthy(output.find(({ fileName }) => fileName === 'b.js'));
    t.truthy(output.find(({ fileName }) => fileName === 'c.js'));
  } else {
    t.is(Object.keys(output).length, 3);
    t.is('b.js' in output, true);
    t.is('c.js' in output, true);
  }
});

test('handles references to `global`', async (t) => {
  const bundle = await rollup({
    input: 'fixtures/samples/global/main.js',
    plugins: [commonjs()]
  });

  const code = await getCodeFromBundle(bundle);

  const mockWindow = {};
  const mockGlobal = {};
  const mockSelf = {};

  const fn = new Function('module', 'globalThis', 'window', 'global', 'self', code);

  fn({}, undefined, mockWindow, mockGlobal, mockSelf);
  t.is(mockWindow.foo, 'bar', code);
  t.is(mockGlobal.foo, undefined, code);
  t.is(mockSelf.foo, undefined, code);

  fn({}, undefined, undefined, mockGlobal, mockSelf);
  t.is(mockGlobal.foo, 'bar', code);
  t.is(mockSelf.foo, undefined, code);

  fn({}, undefined, undefined, undefined, mockSelf);
  t.is(mockSelf.foo, 'bar', code);
});

test('handles multiple references to `global`', async (t) => {
  const bundle = await rollup({
    input: 'fixtures/samples/global-in-if-block/main.js',
    plugins: [commonjs()]
  });

  const code = await getCodeFromBundle(bundle);
  const fn = new Function('module', 'exports', 'globalThis', code);
  const module = { exports: {} };
  const globalThis = {};

  fn(module, module.exports, globalThis);
  t.is(globalThis.count, 1);

  fn(module, module.exports, globalThis);
  t.is(globalThis.count, 2);
});

test('handles transpiled CommonJS modules', async (t) => {
  const bundle = await rollup({
    input: 'fixtures/samples/corejs/literal-with-default.js',
    plugins: [commonjs()]
  });

  const code = await getCodeFromBundle(bundle);
  const module = { exports: {} };

  const fn = new Function('module', 'exports', code);
  fn(module, module.exports);

  t.is(module.exports, 'foobar', code);
});

test('handles successive builds', async (t) => {
  const plugin = commonjs();
  let bundle = await rollup({
    input: 'fixtures/samples/corejs/literal-with-default.js',
    plugins: [plugin]
  });
  await bundle.generate({
    exports: 'auto',
    format: 'cjs'
  });

  bundle = await rollup({
    input: 'fixtures/samples/corejs/literal-with-default.js',
    plugins: [plugin]
  });
  const code = await getCodeFromBundle(bundle);

  const module = { exports: {} };

  const fn = new Function('module', 'exports', code);
  fn(module, module.exports);

  t.is(module.exports, 'foobar', code);
});

test.serial('handles symlinked node_modules with preserveSymlinks: false', (t) => {
  const cwd = process.cwd();

  // ensure we resolve starting from a directory with
  // symlinks in node_modules.
  process.chdir(fileURLToPath(new URL('fixtures/samples/symlinked-node-modules', import.meta.url)));

  return t.notThrowsAsync(
    rollup({
      input: './index.js',
      onwarn(warning) {
        // should not get a warning about unknown export 'foo'
        throw new Error(`Unexpected warning: ${warning.message}`);
      },
      plugins: [
        nodeResolve({
          preserveSymlinks: false,
          preferBuiltins: false
        }),
        commonjs()
      ]
    })
      .then((v) => {
        process.chdir(cwd);
        return v;
      })
      .catch((err) => {
        process.chdir(cwd);
        throw err;
      })
  );
});

test('converts a CommonJS module with custom file extension', async (t) => {
  const bundle = await rollup({
    input: 'fixtures/samples/extension/main.coffee',
    plugins: [commonjs({ extensions: ['.coffee'] })]
  });

  t.is((await executeBundle(bundle, t)).exports, 42);
});

test('import CommonJS module with esm property should get default export ', async (t) => {
  const bundle = await rollup({
    input: 'fixtures/samples/cjs-with-esm-property/main.js',
    plugins: [
      commonjs({
        defaultIsModuleExports: 'auto'
      })
    ]
  });
  const result = await executeBundle(bundle, t);
  t.is(result.error, undefined);

  const bundle2 = await rollup({
    input: 'fixtures/samples/cjs-with-esm-property/main.js',
    plugins: [
      commonjs({
        defaultIsModuleExports: true
      })
    ]
  });
  const result2 = await executeBundle(bundle2, t);
  t.is(result2.error.message, 'libExports is not a function');
});

test('identifies named exports from object literals', async (t) => {
  const bundle = await rollup({
    input: 'fixtures/samples/named-exports-from-object-literal/main.js',
    plugins: [commonjs()]
  });

  t.plan(3);
  await testBundle(t, bundle);
});

test('can ignore references to `global`', async (t) => {
  const bundle = await rollup({
    input: 'fixtures/samples/ignore-global/main.js',
    plugins: [commonjs({ ignoreGlobal: true })],
    onwarn: (warning) => {
      if (warning.code === 'THIS_IS_UNDEFINED') return;
      // eslint-disable-next-line no-console
      console.warn(warning.message);
    }
  });

  const code = await getCodeFromBundle(bundle);
  const { exports, global } = await executeBundle(bundle, t);

  t.is(exports.immediate1, global.setImmediate, code);
  t.is(exports.immediate2, global.setImmediate, code);
  t.is(exports.immediate3, null, code);
});

test('can handle parens around right have node while producing default export', async (t) => {
  const bundle = await rollup({
    input: 'fixtures/samples/paren-expression/index.js',
    plugins: [commonjs()]
  });

  t.is((await executeBundle(bundle, t, { testEntry: 'index.js' })).exports, 42);
});

test('typeof transforms: correct-scoping', async (t) => {
  const bundle = await rollup({
    input: 'fixtures/samples/umd/correct-scoping.js',
    plugins: [commonjs()]
  });

  t.is((await executeBundle(bundle, t, { testEntry: 'correct-scoping.js' })).exports, 'object');
});

test('typeof transforms: protobuf', async (t) => {
  const bundle = await rollup({
    input: 'fixtures/samples/umd/protobuf.js',
    external: ['bytebuffer', 'foo'],
    plugins: [commonjs()]
  });

  t.is((await executeBundle(bundle, t, { testEntry: 'protobuf.js' })).exports, true);
});

test('typeof transforms: sinon', async (t) => {
  const bundle = await rollup({
    input: 'fixtures/samples/umd/sinon.js',
    plugins: [commonjs()]
  });

  const {
    output: [{ code }]
  } = await bundle.generate({ format: 'es' });

  t.is(code.indexOf('typeof require'), -1, code);
  t.is(code.indexOf('typeof module'), -1, code);
  t.is(code.indexOf('typeof define'), -1, code);
});

test('deconflicts helper name', async (t) => {
  const bundle = await rollup({
    input: 'fixtures/samples/deconflict-helpers/main.js',
    plugins: [commonjs()]
  });

  const { exports } = await executeBundle(bundle, t);
  t.not(exports, 'nope');
});

test('deconflicts reserved keywords', async (t) => {
  const bundle = await rollup({
    input: 'fixtures/samples/reserved-as-property/main.js',
    plugins: [commonjs()]
  });

  const reservedProp = (await executeBundle(bundle, t, { exports: 'default' })).exports.delete;
  t.is(reservedProp, 'foo');
});

test('does not process the entry file when it has a leading "." (issue #63)', async (t) => {
  const bundle = await rollup({
    input: './fixtures/function/basic/main.js',
    plugins: [commonjs()]
  });

  await t.notThrowsAsync(executeBundle(bundle, t));
});

test('respects other plugins', async (t) => {
  const bundle = await rollup({
    input: 'fixtures/samples/other-transforms/main.js',
    plugins: [
      {
        transform(code, id) {
          if (id[0] === '\0') return null;
          return code.replace('40', '41');
        }
      },
      commonjs()
    ]
  });

  await t.notThrowsAsync(executeBundle(bundle, t));
});

test('rewrites top-level defines', async (t) => {
  const bundle = await rollup({
    input: 'fixtures/samples/define-is-undefined/main.js',
    plugins: [commonjs()]
  });

  function define() {
    throw new Error('nope');
  }

  define.amd = true;

  const { exports } = await executeBundle(bundle, t, { context: { define } });
  t.is(exports, 42);
});

test('respects options.external', async (t) => {
  const bundle = await rollup({
    input: 'fixtures/samples/external/main.js',
    plugins: [nodeResolve(), commonjs()],
    external: ['baz']
  });

  const code = await getCodeFromBundle(bundle);
  t.is(code.indexOf('hello'), -1);

  const { exports } = await executeBundle(bundle, t);
  t.is(exports, 'HELLO');
});

test('prefers to set name using directory for index files', async (t) => {
  const bundle = await rollup({
    input: 'fixtures/samples/rename-index/main.js',
    plugins: [commonjs()]
  });

  const code = await getCodeFromBundle(bundle);
  t.is(code.indexOf('var index'), -1, 'does not contain index');
  t.not(code.indexOf('var invalidVar'), -1, 'contains invalidVar');
  t.not(code.indexOf('var validVar'), -1, 'contains validVar');
  t.not(code.indexOf('var nonIndex'), -1, 'contains nonIndex');
});

test('correctly wraps the default export from a CommonJS module when it is a class', async (t) => {
  const bundle = await rollup({
    input: 'fixtures/samples/es-module-with-class-as-default-export/main.js',
    plugins: [commonjs()]
  });
  const result = await executeBundle(bundle, t);
  t.is(result.error, undefined);
});

test('does not warn even if the ES module does not export "default"', async (t) => {
  const warns = [];
  await rollup({
    input: 'fixtures/samples/es-modules-without-default-export/main.js',
    plugins: [commonjs()],
    onwarn: (warn) => warns.push(warn)
  });
  t.is(warns.length, 0);

  await rollup({
    input: 'fixtures/function/bare-import/bar.js',
    plugins: [commonjs()],
    onwarn: (warn) => warns.push(warn)
  });
  t.is(warns.length, 0);

  await rollup({
    input: 'fixtures/function/bare-import-comment/main.js',
    plugins: [commonjs()],
    onwarn: (warn) => warns.push(warn)
  });
  t.is(warns.length, 0);
});

test('compiles with cache', async (t) => {
  const plugin = commonjs();

  const { cache } = await rollup({
    input: 'fixtures/function/index/main.js',
    plugins: [plugin]
  });

  await t.notThrowsAsync(
    rollup({
      input: 'fixtures/function/index/main.js',
      plugins: [plugin],
      cache
    })
  );
});

test('creates an error with a code frame when parsing fails', async (t) => {
  try {
    await rollup({
      input: 'fixtures/samples/invalid-syntax/main.js',
      plugins: [commonjs()]
    });
  } catch (error) {
    t.is(
      error.frame,
      `1: /* eslint-disable */
2: export const foo = 2,
                       ^`
    );
  }
});

// Virtual modules are treated as "requireReturnsDefault: 'always'" to avoid interop
test('ignores virtual modules', async (t) => {
  const bundle = await rollup({
    input: 'fixtures/samples/ignore-virtual-modules/main.js',
    plugins: [
      commonjs(),
      {
        resolveId(id) {
          if (id === '\0virtual' || id === '\0resolved-virtual') {
            return '\0resolved-virtual';
          }
          return null;
        },
        load(id) {
          if (id === '\0resolved-virtual') {
            return 'export default "Virtual export"';
          }
          return null;
        }
      }
    ]
  });
  t.is((await executeBundle(bundle, t)).exports, 'Virtual export');
});

test('does not produce warnings when importing .mjs without default export', async (t) => {
  const bundle = await rollup({
    input: 'main.mjs',
    onwarn(warning) {
      // The interop should not trigger a "default is not exported" warning
      throw new Error(`Unexpected warning: ${warning.message}`);
    },
    plugins: [
      commonjs(),
      {
        load(id) {
          if (id === 'main.mjs') {
            return 'import cjs from "cjs.js"; export default cjs;';
          }
          if (id === 'cjs.js') {
            // CJS libraries expect to receive a CJS file here
            return 'module.exports = require("fromNodeModules");';
          }
          if (id === 'fromNodeModules.mjs') {
            return 'export const result = "from esm";';
          }
          return null;
        },
        resolveId(id) {
          // rollup-plugin-node-resolve usually prefers ESM versions
          if (id === 'fromNodeModules') {
            return 'fromNodeModules.mjs';
          }
          return id;
        }
      }
    ]
  });
  t.deepEqual((await executeBundle(bundle, t)).exports, { result: 'from esm' });
});

test('produces optimized code when importing esm with a known default export', async (t) => {
  const bundle = await rollup({
    input: 'main.js',
    plugins: [
      commonjs({ requireReturnsDefault: true }),
      loader({
        'main.js': 'module.exports = require("esm.js")',
        'esm.js': 'export const ignored = "ignored"; export default "default"'
      })
    ]
  });
  t.snapshot(await getCodeFromBundle(bundle));
});

test('produces optimized code when importing esm without a default export', async (t) => {
  const bundle = await rollup({
    input: 'main.js',
    plugins: [
      commonjs(),
      loader({
        'main.js': 'module.exports = require("esm.js")',
        'esm.js': 'export const value = "value";'
      })
    ]
  });
  t.snapshot(await getCodeFromBundle(bundle));
});

test('handles array destructuring assignment', async (t) => {
  const bundle = await rollup({
    input: 'fixtures/samples/array-destructuring-assignment/main.js',
    plugins: [commonjs({ sourceMap: true })]
  });

  t.snapshot(await getCodeFromBundle(bundle, { exports: 'named' }));
});

test('can spread an object into module.exports', async (t) => {
  const bundle = await rollup({
    input: 'fixtures/samples/module-exports-spread/main.js',
    plugins: [commonjs()]
  });
  t.snapshot(await getCodeFromBundle(bundle));
});

test('logs a warning when the deprecated namedExports option is used', async (t) => {
  let message;
  const bundle = await rollup({
    onwarn(warning) {
      ({ message } = warning);
    },
    input: 'fixtures/samples/sourcemap/main.js',
    plugins: [commonjs({ namedExports: { foo: ['bar'] } })]
  });

  await getCodeFromBundle(bundle);
  t.is(
    message,
    'The namedExports option from "@rollup/plugin-commonjs" is deprecated. Named exports are now handled automatically.'
  );
});

// This test uses worker threads to simulate an empty internal cache and needs at least Node 12
if (Number(/^v(\d+)/.exec(process.version)[1]) >= 12) {
  test('can be cached across instances', async (t) => {
    const bundle = await rollup({
      input: 'fixtures/samples/caching/main.js',
      plugins: [commonjs()]
    });
    const { cache } = bundle;
    const code = await getCodeFromBundle(bundle);

    // We do a second run in a worker so that all internal state is cleared
    const { Worker } = await import('worker_threads');
    const getRollupUpCodeWithCache = new Worker(
      fileURLToPath(new URL('fixtures/samples/caching/rollupWorker.js', import.meta.url)),
      {
        workerData: cache
      }
    );

    t.is(code, await new Promise((done) => getRollupUpCodeWithCache.on('message', done)));
  });
}

test('does not affect subsequently created instances when called with `requireReturnsDefault: "preferred"`', async (t) => {
  const input = 'fixtures/function/import-esm-require-returns-default-preferred/main.js';
  const options = { requireReturnsDefault: 'preferred' };

  const instance1 = commonjs(options);
  const bundle1 = await rollup({
    input,
    plugins: [instance1]
  });
  const code1 = (await bundle1.generate({})).output[0].code;

  const instance2 = commonjs(options);
  const bundle2 = await rollup({
    input,
    plugins: [instance2]
  });
  const code2 = (await bundle2.generate({})).output[0].code;

  t.is(code1, code2);
});

// This test works only on Windows, which treats both forward and backward
// slashes as path separators
if (os.platform() === 'win32') {
  test('supports both forward and backward slash as path separator in directory-based modules', async (t) => {
    const bundle = await rollup({
      input: 'fixtures/samples/module-path-separator/main.js',
      plugins: [
        // Ad-hoc plugin that reverses the path separator of foo/index.js
        {
          name: 'test-path-separator-reverser',
          async resolveId(source, importer) {
            if (source.endsWith('foo')) {
              const fullPath = path.resolve(path.dirname(importer), source, 'index.js');
              // Ensure that the module ID uses a non-default path separator
              return fullPath.replace(/[\\/]/g, (sep) => (sep === '/' ? '\\' : '/'));
            }
            return null;
          }
        },
        commonjs()
      ]
    });

    const code = await getCodeFromBundle(bundle);
    t.regex(code, /var foo(\$\d+)? = {}/);
  });
}

test('throws when there is a dynamic require from outside dynamicRequireRoot', async (t) => {
  let error = null;
  try {
    await rollup({
      input: 'fixtures/samples/dynamic-require-outside-root/main.js',
      plugins: [
        commonjs({
          dynamicRequireRoot: 'fixtures/samples/dynamic-require-outside-root/nested',
          dynamicRequireTargets: ['fixtures/samples/dynamic-require-outside-root/nested/target.js']
        })
      ]
    });
  } catch (err) {
    error = err;
  }

  const cwd = process.cwd();
  const id = normalizePathSlashes(
    path.join(cwd, 'fixtures/samples/dynamic-require-outside-root/main.js')
  );
  const dynamicRequireRoot = normalizePathSlashes(
    path.join(cwd, 'fixtures/samples/dynamic-require-outside-root/nested')
  );
  const minimalDynamicRequireRoot = normalizePathSlashes(
    path.join(cwd, 'fixtures/samples/dynamic-require-outside-root')
  );

  t.like(error, {
    message: `"${id}" contains dynamic require statements but it is not within the current dynamicRequireRoot "${dynamicRequireRoot}". You should set dynamicRequireRoot to "${minimalDynamicRequireRoot}" or one of its parent directories.`,
    pluginCode: 'DYNAMIC_REQUIRE_OUTSIDE_ROOT',
    normalizedId: id,
    normalizedDynamicRequireRoot: dynamicRequireRoot
  });
});

test('does not throw when a dynamic require uses different slashes than dynamicRequireRoot', async (t) => {
  let error = null;
  try {
    await rollup({
      input: 'fixtures/samples/dynamic-require-outside-root/main.js',
      plugins: [
        commonjs({
          dynamicRequireRoot: 'fixtures\\samples\\dynamic-require-outside-root',
          dynamicRequireTargets: [
            'fixtures\\samples\\dynamic-require-outside-root\\nested\\target.js'
          ]
        })
      ]
    });
  } catch (err) {
    error = err;
  }

  t.is(error, null);
});

// On Windows, avoid a false error about a module not being in the dynamic require root due to
// incoherent slashes/backslashes in the paths.
if (os.platform() === 'win32') {
  test('correctly asserts dynamicRequireRoot on Windows', async (t) => {
    let error = null;
    try {
      await rollup({
        input: 'fixtures/samples/dynamic-require-outside-root/main.js',
        plugins: [
          commonjs({
            dynamicRequireRoot: 'fixtures/samples/dynamic-require-outside-root',
            dynamicRequireTargets: [
              'fixtures/samples/dynamic-require-outside-root/nested/target.js'
            ]
          })
        ]
      });
    } catch (err) {
      error = err;
    }

    t.is(error, null);
  });
}

test('does not transform typeof exports for mixed modules', async (t) => {
  const bundle = await rollup({
    input: 'fixtures/samples/mixed-module-typeof-exports/main.js',
    plugins: [commonjs({ transformMixedEsModules: true })]
  });

  const {
    output: [{ code }]
  } = await bundle.generate({ format: 'es' });

  t.is(code.includes('typeof exports'), true, '"typeof exports" not found in the code');
  t.snapshot(code);
});

test('throws when using an old node_resolve version', async (t) => {
  let error = null;
  try {
    await rollup({
      input: 'ignored',
      plugins: [commonjs(), { name: nodeResolve().name }]
    });
  } catch (err) {
    error = err;
  }
  t.like(error, {
    message:
      'Insufficient @rollup/plugin-node-resolve version: "@rollup/plugin-commonjs" requires at least @rollup/plugin-node-resolve@13.0.6.'
  });
});

test('throws when using an inadequate node_resolve version', async (t) => {
  let error = null;
  try {
    await rollup({
      input: 'ignored',
      plugins: [commonjs(), { name: nodeResolve().name, version: '13.0.5' }]
    });
  } catch (err) {
    error = err;
  }
  t.like(error, {
    message:
      'Insufficient @rollup/plugin-node-resolve version: "@rollup/plugin-commonjs" requires at least @rollup/plugin-node-resolve@13.0.6 but found @rollup/plugin-node-resolve@13.0.5.'
  });
});

const onwarn = (warning) => {
  if (warning.code !== 'CIRCULAR_DEPENDENCY') {
    throw new Error(warning.message);
  }
};

const getTransformTracker = (trackedId) => {
  const trackedTransforms = [];
  const meta = {};
  return {
    meta,
    trackedTransforms,
    tracker: {
      name: 'transform-tracker',
      transform(code, id) {
        trackedTransforms.push(id);
      },
      moduleParsed({ id, meta: { commonjs: commonjsMeta } }) {
        if (id === trackedId) {
          Object.assign(meta, commonjsMeta);
        }
      }
    }
  };
};

test('handles when an imported dependency of an ES module changes type', async (t) => {
  const { meta, tracker, trackedTransforms } = getTransformTracker('dep.js');
  const modules = {};
  const resetModules = () => {
    modules['main.js'] = "import {dep} from 'dep.js';export default dep;";
    modules['dep.js'] = "export const dep = 'esm';";
  };
  const options = {
    input: 'main.js',
    plugins: [commonjs(), loader(modules), tracker],
    onwarn
  };

  resetModules();
  let bundle = await rollup(options);
  t.is(meta.isCommonJS, false);
  t.deepEqual((await executeBundle(bundle, t)).exports, 'esm');
  t.deepEqual(trackedTransforms, ['main.js', 'dep.js']);
  trackedTransforms.length = 0;
  const esCode = await getCodeFromBundle(bundle);
  t.snapshot(esCode);

  modules['dep.js'] = "exports.dep = 'cjs';";
  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(meta.isCommonJS, 'withRequireFunction');
  t.deepEqual((await executeBundle(bundle, t)).exports, 'cjs');
  t.deepEqual(trackedTransforms, [
    'dep.js',
    'main.js',
    '\0dep.js?commonjs-es-import',
    '\0commonjsHelpers.js',
    '\0dep.js?commonjs-exports'
  ]);
  trackedTransforms.length = 0;
  const cjsCode = await getCodeFromBundle(bundle);
  t.snapshot(cjsCode);

  modules['dep.js'] = "exports.dep = 'cjs'; exports.dep += require('dep.js').dep;";
  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(meta.isCommonJS, 'withRequireFunction');
  t.deepEqual((await executeBundle(bundle, t)).exports, 'cjscjs');
  t.deepEqual(trackedTransforms, ['dep.js']);
  trackedTransforms.length = 0;
  const wrappedCode = await getCodeFromBundle(bundle);
  t.snapshot(wrappedCode);

  resetModules();
  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(meta.isCommonJS, false);
  t.deepEqual((await executeBundle(bundle, t)).exports, 'esm');
  t.deepEqual(trackedTransforms, ['dep.js', 'main.js']);
  trackedTransforms.length = 0;
  t.is(await getCodeFromBundle(bundle), esCode);

  modules['dep.js'] = "exports.dep = 'cjs'; exports.dep += require('dep.js').dep;";
  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(meta.isCommonJS, 'withRequireFunction');
  t.deepEqual((await executeBundle(bundle, t)).exports, 'cjscjs');
  t.deepEqual(trackedTransforms, [
    'dep.js',
    'main.js',
    '\0dep.js?commonjs-es-import',
    '\0commonjsHelpers.js',
    '\0dep.js?commonjs-exports'
  ]);
  trackedTransforms.length = 0;
  t.is(await getCodeFromBundle(bundle), wrappedCode);

  modules['dep.js'] = "exports.dep = 'cjs';";
  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(meta.isCommonJS, 'withRequireFunction');
  t.deepEqual((await executeBundle(bundle, t)).exports, 'cjs');
  t.deepEqual(trackedTransforms, ['dep.js']);
  trackedTransforms.length = 0;
  t.is(await getCodeFromBundle(bundle), cjsCode);

  resetModules();
  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(meta.isCommonJS, false);
  t.deepEqual((await executeBundle(bundle, t)).exports, 'esm');
  t.deepEqual(trackedTransforms, ['dep.js', 'main.js']);
  trackedTransforms.length = 0;
  t.is(await getCodeFromBundle(bundle), esCode);
});

test('handles when a dynamically imported dependency of an ES module changes type', async (t) => {
  const { meta, tracker, trackedTransforms } = getTransformTracker('dep.js');
  const modules = {};
  const resetModules = () => {
    modules['main.js'] = "export default import('dep.js').then(({dep}) => dep);";
    modules['dep.js'] = "export const dep = 'esm';";
  };
  const options = {
    input: 'main.js',
    plugins: [commonjs(), loader(modules), tracker],
    onwarn
  };

  resetModules();
  let bundle = await rollup(options);
  t.is(meta.isCommonJS, false);
  t.deepEqual(await (await executeBundle(bundle, t)).exports, 'esm');
  t.deepEqual(trackedTransforms, ['main.js', 'dep.js']);
  trackedTransforms.length = 0;

  modules['dep.js'] = "exports.dep = 'cjs';";
  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(meta.isCommonJS, 'withRequireFunction');
  t.deepEqual(await (await executeBundle(bundle, t)).exports, 'cjs');
  t.deepEqual(trackedTransforms, [
    'dep.js',
    'main.js',
    '\0dep.js?commonjs-es-import',
    '\0commonjsHelpers.js',
    '\0dep.js?commonjs-exports'
  ]);
  trackedTransforms.length = 0;

  modules['dep.js'] = "exports.dep = 'cjs'; exports.dep += require('dep.js').dep;";
  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(meta.isCommonJS, 'withRequireFunction');
  t.deepEqual(await (await executeBundle(bundle, t)).exports, 'cjscjs');
  t.deepEqual(trackedTransforms, ['dep.js']);
  trackedTransforms.length = 0;

  resetModules();
  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(meta.isCommonJS, false);
  t.deepEqual(await (await executeBundle(bundle, t)).exports, 'esm');
  t.deepEqual(trackedTransforms, ['dep.js', 'main.js']);
  trackedTransforms.length = 0;

  modules['dep.js'] = "exports.dep = 'cjs'; exports.dep += require('dep.js').dep;";
  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(meta.isCommonJS, 'withRequireFunction');
  t.deepEqual(await (await executeBundle(bundle, t)).exports, 'cjscjs');
  t.deepEqual(trackedTransforms, [
    'dep.js',
    'main.js',
    '\0dep.js?commonjs-es-import',
    '\0commonjsHelpers.js',
    '\0dep.js?commonjs-exports'
  ]);
  trackedTransforms.length = 0;

  modules['dep.js'] = "exports.dep = 'cjs';";
  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(meta.isCommonJS, 'withRequireFunction');
  t.deepEqual(await (await executeBundle(bundle, t)).exports, 'cjs');
  t.deepEqual(trackedTransforms, ['dep.js']);
  trackedTransforms.length = 0;

  resetModules();
  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(meta.isCommonJS, false);
  t.deepEqual(await (await executeBundle(bundle, t)).exports, 'esm');
  t.deepEqual(trackedTransforms, ['dep.js', 'main.js']);
  trackedTransforms.length = 0;
});

test('handles when a required dependency of a CJS module changes type', async (t) => {
  const { meta, tracker, trackedTransforms } = getTransformTracker('dep.js');
  const modules = {};
  const resetModules = () => {
    modules['main.js'] = "module.exports = require('dep.js').dep;";
    modules['dep.js'] = "export const dep = 'esm';";
  };
  const options = {
    input: 'main.js',
    plugins: [commonjs(), loader(modules), tracker],
    onwarn
  };

  resetModules();
  let bundle = await rollup(options);
  t.is(meta.isCommonJS, false);
  t.deepEqual((await executeBundle(bundle, t)).exports, 'esm');
  t.deepEqual(trackedTransforms, [
    'dep.js',
    'main.js',
    'main.js?commonjs-entry',
    '\0commonjsHelpers.js',
    '\0dep.js?commonjs-proxy'
  ]);
  trackedTransforms.length = 0;
  const esCode = await getCodeFromBundle(bundle);
  t.snapshot(esCode);

  modules['dep.js'] = "exports.dep = 'cjs';";
  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(meta.isCommonJS, 'withRequireFunction');
  t.deepEqual((await executeBundle(bundle, t)).exports, 'cjs');
  t.deepEqual(trackedTransforms, [
    'dep.js',
    'main.js',
    'main.js?commonjs-entry',
    '\0dep.js?commonjs-exports'
  ]);
  trackedTransforms.length = 0;
  const cjsCode = await getCodeFromBundle(bundle);
  t.snapshot(cjsCode);

  modules['dep.js'] = "exports.dep = 'cjs'; exports.dep += require('dep.js').dep;";
  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(meta.isCommonJS, 'withRequireFunction');
  t.deepEqual((await executeBundle(bundle, t)).exports, 'cjscjs');
  t.deepEqual(trackedTransforms, ['dep.js', 'main.js?commonjs-entry']);
  trackedTransforms.length = 0;
  const wrappedCode = await getCodeFromBundle(bundle);
  t.snapshot(wrappedCode);

  resetModules();
  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(meta.isCommonJS, false);
  t.deepEqual((await executeBundle(bundle, t)).exports, 'esm');
  t.deepEqual(trackedTransforms, [
    'dep.js',
    'main.js',
    'main.js?commonjs-entry',
    '\0dep.js?commonjs-proxy'
  ]);
  trackedTransforms.length = 0;
  t.is(await getCodeFromBundle(bundle), esCode);

  modules['dep.js'] = "exports.dep = 'cjs'; exports.dep += require('dep.js').dep;";
  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(meta.isCommonJS, 'withRequireFunction');
  t.deepEqual((await executeBundle(bundle, t)).exports, 'cjscjs');
  t.deepEqual(trackedTransforms, [
    'dep.js',
    'main.js',
    'main.js?commonjs-entry',
    '\0dep.js?commonjs-exports'
  ]);
  trackedTransforms.length = 0;
  t.is(await getCodeFromBundle(bundle), wrappedCode);

  modules['dep.js'] = "exports.dep = 'cjs';";
  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(meta.isCommonJS, 'withRequireFunction');
  t.deepEqual((await executeBundle(bundle, t)).exports, 'cjs');
  t.deepEqual(trackedTransforms, ['dep.js', 'main.js?commonjs-entry']);
  trackedTransforms.length = 0;
  t.is(await getCodeFromBundle(bundle), cjsCode);

  resetModules();
  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(meta.isCommonJS, false);
  t.deepEqual((await executeBundle(bundle, t)).exports, 'esm');
  t.deepEqual(trackedTransforms, [
    'dep.js',
    'main.js',
    'main.js?commonjs-entry',
    '\0dep.js?commonjs-proxy'
  ]);
  trackedTransforms.length = 0;
  t.is(await getCodeFromBundle(bundle), esCode);
});

test('handles when a required dependency of a mixed ES module changes type', async (t) => {
  const { meta, tracker, trackedTransforms } = getTransformTracker('dep.js');
  const modules = {};
  const resetModules = () => {
    modules['main.js'] = "export default require('dep.js').dep;";
    modules['dep.js'] = "export const dep = 'esm';";
  };
  const options = {
    input: 'main.js',
    plugins: [commonjs({ transformMixedEsModules: true }), loader(modules), tracker],
    onwarn
  };

  resetModules();
  let bundle = await rollup(options);
  t.is(meta.isCommonJS, false);
  t.deepEqual((await executeBundle(bundle, t)).exports, 'esm');
  t.deepEqual(trackedTransforms, [
    'dep.js',
    'main.js',
    '\0commonjsHelpers.js',
    '\0dep.js?commonjs-proxy'
  ]);
  trackedTransforms.length = 0;
  const esCode = await getCodeFromBundle(bundle);
  t.snapshot(esCode);

  modules['dep.js'] = "exports.dep = 'cjs';";
  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(meta.isCommonJS, 'withRequireFunction');
  t.deepEqual((await executeBundle(bundle, t)).exports, 'cjs');
  t.deepEqual(trackedTransforms, ['dep.js', 'main.js', '\0dep.js?commonjs-exports']);
  trackedTransforms.length = 0;
  const cjsCode = await getCodeFromBundle(bundle);
  t.snapshot(cjsCode);

  modules['dep.js'] = "exports.dep = 'cjs'; exports.dep += require('dep.js').dep;";
  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(meta.isCommonJS, 'withRequireFunction');
  t.deepEqual((await executeBundle(bundle, t)).exports, 'cjscjs');
  t.deepEqual(trackedTransforms, ['dep.js']);
  trackedTransforms.length = 0;
  const wrappedCode = await getCodeFromBundle(bundle);
  t.snapshot(wrappedCode);

  resetModules();
  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(meta.isCommonJS, false);
  t.deepEqual((await executeBundle(bundle, t)).exports, 'esm');
  t.deepEqual(trackedTransforms, ['dep.js', 'main.js', '\0dep.js?commonjs-proxy']);
  trackedTransforms.length = 0;
  t.is(await getCodeFromBundle(bundle), esCode);

  modules['dep.js'] = "exports.dep = 'cjs'; exports.dep += require('dep.js').dep;";
  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(meta.isCommonJS, 'withRequireFunction');
  t.deepEqual((await executeBundle(bundle, t)).exports, 'cjscjs');
  t.deepEqual(trackedTransforms, ['dep.js', 'main.js', '\0dep.js?commonjs-exports']);
  trackedTransforms.length = 0;
  t.is(await getCodeFromBundle(bundle), wrappedCode);

  modules['dep.js'] = "exports.dep = 'cjs';";
  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(meta.isCommonJS, 'withRequireFunction');
  t.deepEqual((await executeBundle(bundle, t)).exports, 'cjs');
  t.deepEqual(trackedTransforms, ['dep.js']);
  trackedTransforms.length = 0;
  t.is(await getCodeFromBundle(bundle), cjsCode);

  resetModules();
  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(meta.isCommonJS, false);
  t.deepEqual((await executeBundle(bundle, t)).exports, 'esm');
  t.deepEqual(trackedTransforms, ['dep.js', 'main.js', '\0dep.js?commonjs-proxy']);
  trackedTransforms.length = 0;
  t.is(await getCodeFromBundle(bundle), esCode);
});

test('handles ESM cycles when using the cache', async (t) => {
  const modules = {};
  const resetModules = () => {
    modules['main.js'] = "import 'dep.js';console.log('main');";
    modules['dep.js'] = "import 'main.js';console.log('dep');";
  };
  const options = {
    input: 'main.js',
    plugins: [commonjs(), loader(modules)],
    onwarn
  };

  resetModules();
  let bundle = await rollup(options);

  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.snapshot(await getCodeFromBundle(bundle));
});

test('handles external dependencies when using the cache', async (t) => {
  const modules = {};
  const resetModules = () => {
    modules['main.js'] =
      "import first from 'first.js';import second from 'second.js';export default first + second;";
    modules['first.js'] = "export {first as default} from 'external';";
    modules['second.js'] = "module.exports = require('external').second;";
  };
  const options = {
    input: 'main.js',
    external: ['external'],
    plugins: [commonjs(), loader(modules)],
    onwarn
  };

  resetModules();
  let bundle = await rollup(options);
  t.is(
    (
      await executeBundle(bundle, t, {
        context: {
          require(id) {
            if (id === 'external') {
              return { first: 'first', second: 'second' };
            }
            throw new Error(`Unexpected require "${id}"`);
          }
        }
      })
    ).exports,
    'firstsecond'
  );
  const code = await getCodeFromBundle(bundle);
  t.snapshot(code);

  options.cache = bundle.cache;
  bundle = await rollup(options);
  t.is(await getCodeFromBundle(bundle), code);
});

test('allows the config to be reused', async (t) => {
  const config = {
    preserveModules: true,
    plugins: [
      commonjs({ requireReturnsDefault: true }),
      loader({
        'foo.js': "console.log('foo')",
        'bar.js': "console.log('bar')"
      })
    ]
  };
  let bundle = await rollup({
    input: 'foo.js',
    ...config
  });
  t.deepEqual(
    bundle.cache.modules.map(({ id }) => id),
    ['foo.js']
  );
  bundle = await rollup({
    input: 'bar.js',
    ...config
  });
  t.deepEqual(
    bundle.cache.modules.map(({ id }) => id),
    ['bar.js']
  );
});

test('keep the shebang at the top of the file content', async (t) => {
  const bundle = await rollup({
    input: ['fixtures/samples/shebang/main.js'],
    plugins: [commonjs()]
  });

  const { output } = await bundle.generate({
    exports: 'auto',
    format: 'cjs',
    chunkFileNames: '[name].js'
  });

  t.is(output[0].code.startsWith('#!/usr/bin/env node\n'), true);
});