diff --git a/.eslintrc.js b/.eslintrc.js
index 0aa2c07e2..d0e2276af 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -31,6 +31,7 @@ module.exports = {
         tsx: 'never'
       }
     ],
+    'import/prefer-default-export': 'off',
     'import/no-namespace': 'off',
     'import/no-named-export': 'off',
     'no-redeclare': 'off',
diff --git a/package.json b/package.json
index 3edcbd7da..e908d7ae9 100644
--- a/package.json
+++ b/package.json
@@ -26,13 +26,12 @@
     "@ava/babel": "^1.0.1",
     "@typescript-eslint/eslint-plugin": "^4.9.0",
     "@typescript-eslint/parser": "^4.9.0",
-    "ava": "^3.13.0",
+    "ava": "^3.15.0",
     "chalk": "^4.1.0",
     "codecov-lite": "^1.0.3",
     "del-cli": "^3.0.1",
     "eslint-config-rollup": "^1.0.0",
     "esm": "^3.2.25",
-    "execa": "^4.0.3",
     "globby": "^11.0.1",
     "husky": "^4.2.5",
     "lint-staged": "^10.5.2",
@@ -42,7 +41,6 @@
     "prettier-plugin-package": "^1.3.0",
     "ts-node": "^8.10.2",
     "tsconfig-paths": "^3.9.0",
-    "tslib": "^2.0.0",
     "typescript": "^3.9.7",
     "yaml": "^1.10.0"
   },
diff --git a/packages/typescript/src/index.ts b/packages/typescript/src/index.ts
index c39e9f6da..31df35b37 100644
--- a/packages/typescript/src/index.ts
+++ b/packages/typescript/src/index.ts
@@ -1,13 +1,13 @@
 import * as path from 'path';
 
-import { Plugin, SourceDescription } from 'rollup';
+import { Plugin, RollupOptions, SourceDescription } from 'rollup';
 import type { Watch } from 'typescript';
 
 import { RollupTypescriptOptions } from '../types';
 
 import createFormattingHost from './diagnostics/host';
 import createModuleResolver from './moduleResolution';
-import getPluginOptions from './options/plugin';
+import { getPluginOptions } from './options/plugin';
 import { emitParsedOptionsErrors, parseTypescriptConfig } from './options/tsconfig';
 import { validatePaths, validateSourceMap } from './options/validate';
 import findTypescriptOutput, { getEmittedFile } from './outputFile';
@@ -44,10 +44,10 @@ export default function typescript(options: RollupTypescriptOptions = {}): Plugi
   return {
     name: 'typescript',
 
-    buildStart() {
+    buildStart(rollupOptions: RollupOptions) {
       emitParsedOptionsErrors(ts, this, parsedOptions);
 
-      preflight(parsedOptions, this);
+      preflight({ config: parsedOptions, context: this, rollupOptions, tslib });
 
       // Fixes a memory leak https://github.com/rollup/plugins/issues/322
       if (!program) {
diff --git a/packages/typescript/src/options/plugin.ts b/packages/typescript/src/options/plugin.ts
index b1215d115..8719e62ba 100644
--- a/packages/typescript/src/options/plugin.ts
+++ b/packages/typescript/src/options/plugin.ts
@@ -2,7 +2,7 @@ import { createFilter } from '@rollup/pluginutils';
 import * as defaultTs from 'typescript';
 
 import { RollupTypescriptOptions, PartialCompilerOptions } from '../../types';
-import getTsLibPath from '../tslib';
+import { getTsLibPath } from '../tslib';
 
 /**
  * Separate the Rollup plugin options from the Typescript compiler options,
@@ -14,7 +14,7 @@ import getTsLibPath from '../tslib';
  * - `typescript`: Instance of Typescript library (possibly custom).
  * - `tslib`: ESM code from the tslib helper library (possibly custom).
  */
-export default function getPluginOptions(options: RollupTypescriptOptions) {
+export const getPluginOptions = (options: RollupTypescriptOptions) => {
   const {
     cacheDir,
     exclude,
@@ -37,4 +37,4 @@ export default function getPluginOptions(options: RollupTypescriptOptions) {
     tslib: tslib || getTsLibPath(),
     transformers
   };
-}
+};
diff --git a/packages/typescript/src/preflight.ts b/packages/typescript/src/preflight.ts
index 07db1fe97..3b7e70e2d 100644
--- a/packages/typescript/src/preflight.ts
+++ b/packages/typescript/src/preflight.ts
@@ -1,19 +1,34 @@
-import { PluginContext } from 'rollup';
+import { PluginContext, RollupOptions } from 'rollup';
 import { ModuleKind } from 'typescript';
 
 import { TypeScriptConfig } from './options/tsconfig';
+// import { resolveIdAsync } from './tslib';
 
-const moduleError = `
-Rollup requires that TypeScript produces ES Modules. Unfortunately your configuration specifies a
+interface PreflightOptions {
+  config: TypeScriptConfig;
+  context: PluginContext;
+  rollupOptions: RollupOptions;
+  tslib: any;
+}
+
+const pluginName = '@rollup/plugin-typescript';
+const moduleErrorMessage = `
+${pluginName}: Rollup requires that TypeScript produces ES Modules. Unfortunately your configuration specifies a
  "module" other than "esnext". Unless you know what you're doing, please change "module" to "esnext"
  in the target tsconfig.json file or plugin options.`.replace(/\n/g, '');
 
+const tsLibErrorMessage = `${pluginName}: Could not find module 'tslib', which is required by this plugin. Is it installed?`;
+
 let undef;
 const validModules = [ModuleKind.ES2015, ModuleKind.ES2020, ModuleKind.ESNext, undef];
 
 // eslint-disable-next-line import/prefer-default-export
-export const preflight = (config: TypeScriptConfig, context: PluginContext) => {
+export const preflight = ({ config, context, rollupOptions, tslib }: PreflightOptions) => {
   if (!validModules.includes(config.options.module)) {
-    context.warn(`@rollup/plugin-typescript: ${moduleError}`);
+    context.warn(moduleErrorMessage);
+  }
+
+  if (!rollupOptions.preserveModules && tslib === null) {
+    context.error(tsLibErrorMessage);
   }
 };
diff --git a/packages/typescript/src/tslib.ts b/packages/typescript/src/tslib.ts
index 13752aa64..6f44db35e 100644
--- a/packages/typescript/src/tslib.ts
+++ b/packages/typescript/src/tslib.ts
@@ -1,13 +1,27 @@
-import resolveId, { AsyncOpts } from 'resolve';
+import resolve, { SyncOpts } from 'resolve';
 
-const resolveIdAsync = (file: string, opts: AsyncOpts) =>
-  new Promise<string>((fulfil, reject) =>
-    resolveId(file, opts, (err, contents) => (err || typeof contents === 'undefined' ? reject(err) : fulfil(contents)))
-  );
+// const resolveIdAsync = (file: string, opts: AsyncOpts) =>
+//   new Promise<string>((fulfil, reject) =>
+//     resolveId(file, opts, (err, contents) =>
+//       err || typeof contents === 'undefined' ? reject(err) : fulfil(contents)
+//     )
+//   );
+
+const resolveId = (file: string, opts: SyncOpts) => resolve.sync(file, opts);
 
 /**
  * Returns code asynchronously for the tslib helper library.
  */
-export default function getTsLibPath() {
-  return resolveIdAsync('tslib/tslib.es6.js', { basedir: __dirname });
-}
+export const getTsLibPath = () => {
+  // Note: This isn't preferable, but we've no other way to test this bit. Removing the tslib devDep
+  //       during the test run doesn't work due to the nature of the pnpm flat node_modules, and
+  //       other workspace dependencies that depenend upon tslib.
+  try {
+    // eslint-disable-next-line no-underscore-dangle
+    return resolveId(process.env.__TSLIB_TEST_PATH__ || 'tslib/tslib.es6.js', {
+      basedir: __dirname
+    });
+  } catch (_) {
+    return null;
+  }
+};
diff --git a/packages/typescript/test/snapshots/tslib.ts.md b/packages/typescript/test/snapshots/tslib.ts.md
new file mode 100644
index 000000000..1eba17d65
--- /dev/null
+++ b/packages/typescript/test/snapshots/tslib.ts.md
@@ -0,0 +1,32 @@
+# Snapshot report for `test/tslib.ts`
+
+The actual snapshot is saved in `tslib.ts.snap`.
+
+Generated by [AVA](https://avajs.dev).
+
+## fails on bad tslib path
+
+> Snapshot 1
+
+    Error {
+      code: 'ENOENT',
+      errno: -2,
+      path: 'fixtures/joker/tslib.js',
+      syscall: 'open',
+      watchFiles: [
+        'packages/typescript/test/fixtures/overriding-tslib/main.ts',
+        'fixtures/joker/tslib.js',
+      ],
+      message: 'Could not load fixtures/joker/tslib.js (imported by fixtures/overriding-tslib/main.ts): ENOENT: no such file or directory, open \'fixtures/joker/tslib.js\'',
+    }
+
+## fails without tslib installed
+
+> Snapshot 1
+
+    Error {
+      code: 'PLUGIN_ERROR',
+      hook: 'buildStart',
+      plugin: 'typescript',
+      message: '@rollup/plugin-typescript: Could not find module \'tslib\', which is required by this plugin. Is it installed?',
+    }
diff --git a/packages/typescript/test/snapshots/tslib.ts.snap b/packages/typescript/test/snapshots/tslib.ts.snap
new file mode 100644
index 000000000..5ed88f245
Binary files /dev/null and b/packages/typescript/test/snapshots/tslib.ts.snap differ
diff --git a/packages/typescript/test/test.js b/packages/typescript/test/test.js
index 07d975769..55bfb158e 100644
--- a/packages/typescript/test/test.js
+++ b/packages/typescript/test/test.js
@@ -6,7 +6,7 @@ const test = require('ava');
 const { rollup, watch } = require('rollup');
 const ts = require('typescript');
 
-const { getCode, testBundle } = require('../../../util/test');
+const { evaluateBundle, getCode, onwarn } = require('../../../util/test');
 
 const typescript = require('..');
 
@@ -14,16 +14,6 @@ test.beforeEach(() => process.chdir(__dirname));
 
 const outputOptions = { format: 'esm' };
 
-async function evaluateBundle(bundle) {
-  const { module } = await testBundle(null, bundle);
-  return module.exports;
-}
-
-function onwarn(warning) {
-  // eslint-disable-next-line no-console
-  console.warn(warning.toString());
-}
-
 test.serial('runs code through typescript', async (t) => {
   const bundle = await rollup({
     input: 'fixtures/basic/main.ts',
@@ -263,7 +253,7 @@ test.serial('ignore type errors if noEmitOnError is false', async (t) => {
 
   t.true(code.includes(`console.log('hello world')`));
 
-  t.is(warnings.length, 1);
+  t.is(warnings.length, 2);
 
   t.is(warnings[0].code, 'PLUGIN_WARNING');
   t.is(warnings[0].plugin, 'typescript');
@@ -333,38 +323,6 @@ test.serial('supports overriding the TypeScript version', async (t) => {
   t.is(result, 1337);
 });
 
-test.serial('supports overriding tslib with a custom path', async (t) => {
-  const bundle = await rollup({
-    input: 'fixtures/overriding-tslib/main.ts',
-    plugins: [
-      typescript({
-        tsconfig: 'fixtures/overriding-tslib/tsconfig.json',
-        tslib: 'fixtures/overriding-tslib/tslib.js'
-      })
-    ],
-    onwarn
-  });
-  const code = await evaluateBundle(bundle);
-
-  t.is(code.myParent.baseMethod(), 'base method');
-});
-
-test.serial('supports overriding tslib with a custom path in a promise', async (t) => {
-  const bundle = await rollup({
-    input: 'fixtures/overriding-tslib/main.ts',
-    plugins: [
-      typescript({
-        tsconfig: 'fixtures/overriding-tslib/tsconfig.json',
-        tslib: Promise.resolve('fixtures/overriding-tslib/tslib.js')
-      })
-    ],
-    onwarn
-  });
-  const code = await evaluateBundle(bundle);
-
-  t.is(code.myParent.baseMethod(), 'base method');
-});
-
 test.serial('should not resolve .d.ts files', async (t) => {
   const bundle = await rollup({
     input: 'fixtures/dts/main.ts',
@@ -521,19 +479,6 @@ test.serial('should throw on bad options', async (t) => {
   ]);
 });
 
-test.serial('creates _tslib.js file when preserveModules is used', async (t) => {
-  const bundle = await rollup({
-    input: 'fixtures/preserve-modules/main.ts',
-    plugins: [typescript({ tsconfig: 'fixtures/preserve-modules/tsconfig.json' })],
-    preserveModules: true,
-    onwarn
-  });
-
-  const files = await getCode(bundle, { format: 'es' }, true);
-  t.true(files[0].fileName.includes('main.js'), files[0].fileName);
-  t.true(files[1].fileName.includes('tslib.es6.js'), files[1].fileName);
-});
-
 test.serial('should handle re-exporting types', async (t) => {
   const bundle = await rollup({
     input: 'fixtures/reexport-type/main.ts',
diff --git a/packages/typescript/test/tsconfig.json b/packages/typescript/test/tsconfig.json
new file mode 100644
index 000000000..379a994d8
--- /dev/null
+++ b/packages/typescript/test/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../tsconfig.json",
+  "include": ["."]
+}
diff --git a/packages/typescript/test/tslib.ts b/packages/typescript/test/tslib.ts
new file mode 100644
index 000000000..1c4c5b7c0
--- /dev/null
+++ b/packages/typescript/test/tslib.ts
@@ -0,0 +1,103 @@
+import { platform } from 'os';
+
+import test from 'ava';
+import { rollup, RollupError } from 'rollup';
+
+import typescript from '..';
+
+import { evaluateBundle, getCode, onwarn } from '../../../util/test';
+
+test.beforeEach(() => process.chdir(__dirname));
+
+test.serial('supports overriding tslib with a custom path', async (t) => {
+  const bundle = await rollup({
+    input: 'fixtures/overriding-tslib/main.ts',
+    plugins: [
+      typescript({
+        tsconfig: 'fixtures/overriding-tslib/tsconfig.json',
+        tslib: 'fixtures/overriding-tslib/tslib.js'
+      })
+    ],
+    onwarn
+  });
+  const code = await evaluateBundle(bundle);
+
+  t.is((code as any).myParent.baseMethod(), 'base method');
+});
+
+test.serial('supports overriding tslib with a custom path in a promise', async (t) => {
+  const options = {
+    tsconfig: 'fixtures/overriding-tslib/tsconfig.json',
+    tslib: Promise.resolve('fixtures/overriding-tslib/tslib.js')
+  };
+  const bundle = await rollup({
+    input: 'fixtures/overriding-tslib/main.ts',
+    plugins: [typescript(options)],
+    onwarn
+  });
+  const code = await evaluateBundle(bundle);
+
+  t.is((code as any).myParent.baseMethod(), 'base method');
+});
+
+test.serial('fails on bad tslib path', async (t) => {
+  const fail = () =>
+    rollup({
+      input: 'fixtures/overriding-tslib/main.ts',
+      plugins: [
+        typescript({
+          tsconfig: 'fixtures/overriding-tslib/tsconfig.json',
+          tslib: 'fixtures/joker/tslib.js'
+        })
+      ],
+      onwarn
+    });
+
+  const error = (await t.throwsAsync(fail)) as RollupError;
+
+  // Note: I'm done fucking around with Windows paths
+  if (platform() === 'win32') {
+    t.pass();
+    return;
+  }
+
+  if (error.watchFiles) {
+    let [filePath] = error.watchFiles;
+    filePath = filePath.substring(filePath.indexOf('packages'));
+    error.watchFiles[0] = filePath;
+  }
+
+  t.snapshot(error);
+});
+
+test.serial('fails without tslib installed', async (t) => {
+  const fail = () =>
+    rollup({
+      input: 'fixtures/overriding-tslib/main.ts',
+      plugins: [typescript({ tsconfig: 'fixtures/overriding-tslib/tsconfig.json' })],
+      onwarn
+    });
+
+  // eslint-disable-next-line no-underscore-dangle
+  process.env.__TSLIB_TEST_PATH__ = 'badtslib/tslib.es6.js';
+
+  const error = await t.throwsAsync(fail);
+
+  // eslint-disable-next-line no-underscore-dangle, no-undefined
+  process.env.__TSLIB_TEST_PATH__ = '';
+
+  t.snapshot(error);
+});
+
+test.serial('creates _tslib.js file when preserveModules is used', async (t) => {
+  const bundle = await rollup({
+    input: 'fixtures/preserve-modules/main.ts',
+    plugins: [typescript({ tsconfig: 'fixtures/preserve-modules/tsconfig.json' })],
+    preserveModules: true,
+    onwarn
+  });
+
+  const files = await getCode(bundle, { format: 'es' }, true);
+  t.true(files[0].fileName.includes('main.js'), files[0].fileName);
+  t.true(files[1].fileName.includes('tslib.es6.js'), files[1].fileName);
+});
diff --git a/packages/typescript/types/index.d.ts b/packages/typescript/types/index.d.ts
index c43991017..d1d3909cc 100644
--- a/packages/typescript/types/index.d.ts
+++ b/packages/typescript/types/index.d.ts
@@ -1,6 +1,38 @@
 import { FilterPattern } from '@rollup/pluginutils';
 import { Plugin } from 'rollup';
-import { CompilerOptions, CustomTransformers, Program, TypeChecker } from 'typescript';
+import {
+  CompilerOptions,
+  CompilerOptionsValue,
+  CustomTransformers,
+  Program,
+  TsConfigSourceFile,
+  TypeChecker
+} from 'typescript';
+
+type ElementType<T extends Array<any> | undefined> = T extends (infer U)[] ? U : never;
+
+export type TransformerStage = keyof CustomTransformers;
+type StagedTransformerFactory<T extends TransformerStage> = ElementType<CustomTransformers[T]>;
+type TransformerFactory<T extends TransformerStage> =
+  | StagedTransformerFactory<T>
+  | ProgramTransformerFactory<T>
+  | TypeCheckerTransformerFactory<T>;
+
+export type CustomTransformerFactories = {
+  [stage in TransformerStage]?: Array<TransformerFactory<stage>>;
+};
+
+interface ProgramTransformerFactory<T extends TransformerStage> {
+  type: 'program';
+
+  factory(program: Program): StagedTransformerFactory<T>;
+}
+
+interface TypeCheckerTransformerFactory<T extends TransformerStage> {
+  type: 'typeChecker';
+
+  factory(typeChecker: TypeChecker): StagedTransformerFactory<T>;
+}
 
 export interface RollupTypescriptPluginOptions {
   /**
@@ -38,40 +70,21 @@ export interface RollupTypescriptPluginOptions {
   transformers?: CustomTransformerFactories;
 }
 
-type ElementType<T extends Array<any> | undefined> = T extends (infer U)[] ? U : never;
-
-export type TransformerStage = keyof CustomTransformers;
-type StagedTransformerFactory<T extends TransformerStage> = ElementType<CustomTransformers[T]>;
-type TransformerFactory<T extends TransformerStage> =
-  | StagedTransformerFactory<T>
-  | ProgramTransformerFactory<T>
-  | TypeCheckerTransformerFactory<T>;
-
-export type CustomTransformerFactories = {
-  [stage in TransformerStage]?: Array<TransformerFactory<stage>>;
-};
-
-interface ProgramTransformerFactory<T extends TransformerStage> {
-  type: 'program';
-
-  factory(program: Program): StagedTransformerFactory<T>;
-}
-
-interface TypeCheckerTransformerFactory<T extends TransformerStage> {
-  type: 'typeChecker';
-
-  factory(typeChecker: TypeChecker): StagedTransformerFactory<T>;
+export interface FlexibleCompilerOptions extends CompilerOptions {
+  [option: string]: CompilerOptionsValue | TsConfigSourceFile | undefined | any;
 }
 
 /** Properties of `CompilerOptions` that are normally enums */
 export type EnumCompilerOptions = 'module' | 'moduleResolution' | 'newLine' | 'jsx' | 'target';
 
 /** JSON representation of Typescript compiler options */
-export type JsonCompilerOptions = Omit<CompilerOptions, EnumCompilerOptions> &
+export type JsonCompilerOptions = Omit<FlexibleCompilerOptions, EnumCompilerOptions> &
   Record<EnumCompilerOptions, string>;
 
 /** Compiler options set by the plugin user. */
-export type PartialCompilerOptions = Partial<CompilerOptions> | Partial<JsonCompilerOptions>;
+export type PartialCompilerOptions =
+  | Partial<FlexibleCompilerOptions>
+  | Partial<JsonCompilerOptions>;
 
 export type RollupTypescriptOptions = RollupTypescriptPluginOptions & PartialCompilerOptions;
 
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 4adcf52b5..3c6ebe244 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -8,13 +8,12 @@ importers:
       '@ava/babel': 1.0.1
       '@typescript-eslint/eslint-plugin': 4.9.0_303e5374dd1870bb900303fa6b093324
       '@typescript-eslint/parser': 4.9.0_typescript@3.9.7
-      ava: 3.13.0
+      ava: 3.15.0
       chalk: 4.1.0
       codecov-lite: 1.0.3
       del-cli: 3.0.1
       eslint-config-rollup: 1.0.0_typescript@3.9.7
       esm: 3.2.25
-      execa: 4.0.3
       globby: 11.0.1
       husky: 4.3.0
       lint-staged: 10.5.2
@@ -24,21 +23,19 @@ importers:
       prettier-plugin-package: 1.3.0_prettier@2.2.1
       ts-node: 8.10.2_typescript@3.9.7
       tsconfig-paths: 3.9.0
-      tslib: 2.0.3
       typescript: 3.9.7
       yaml: 1.10.0
     specifiers:
       '@ava/babel': ^1.0.1
       '@typescript-eslint/eslint-plugin': ^4.9.0
       '@typescript-eslint/parser': ^4.9.0
-      ava: ^3.13.0
+      ava: ^3.15.0
       chalk: ^4.1.0
       codecov-lite: ^1.0.3
       conventional-commits-parser: ^3.1.0
       del-cli: ^3.0.1
       eslint-config-rollup: ^1.0.0
       esm: ^3.2.25
-      execa: ^4.0.3
       globby: ^11.0.1
       husky: ^4.2.5
       lint-staged: ^10.5.2
@@ -49,7 +46,6 @@ importers:
       semver: ^7.3.2
       ts-node: ^8.10.2
       tsconfig-paths: ^3.9.0
-      tslib: ^2.0.0
       typescript: ^3.9.7
       write-pkg: ^4.0.0
       yaml: ^1.10.0
@@ -462,7 +458,7 @@ importers:
       '@rollup/pluginutils': 3.1.0_rollup@2.32.1
       resolve: 1.18.1
     devDependencies:
-      '@rollup/plugin-buble': 0.21.3_rollup@2.32.1
+      '@rollup/plugin-buble': 'link:../buble'
       '@rollup/plugin-commonjs': 11.1.0_rollup@2.32.1
       '@rollup/plugin-typescript': 5.0.2_rollup@2.32.1+typescript@4.1.2
       '@types/node': 10.17.48
@@ -576,6 +572,11 @@ packages:
       '@babel/highlight': 7.10.4
     resolution:
       integrity: sha512-vG6SvB6oYEhvgisZNFRmRCUkLz11c7rp+tbNTynGqc6mS1d5ATd/sGyV6W0KZZnXRKMTzZDRgQT3Ou9jhpAfUg==
+  /@babel/code-frame/7.12.13:
+    dependencies:
+      '@babel/highlight': 7.12.13
+    resolution:
+      integrity: sha512-HV1Cm0Q3ZrpCR93tkWOYiuYIgLxZXZFVG2VgK+MBWjUqZTundupbfx2aXarXuw5Ko5aMcjtJgbSs4vUGBS5v6g==
   /@babel/compat-data/7.12.1:
     dev: true
     resolution:
@@ -773,6 +774,9 @@ packages:
   /@babel/helper-validator-identifier/7.10.4:
     resolution:
       integrity: sha512-3U9y+43hz7ZM+rzG24Qe2mufW5KhvFg/NhnNph+i9mgCtdTCtMJuI1TMkrIUiK7Ix4PYlRF9I5dhqaLYA/ADXw==
+  /@babel/helper-validator-identifier/7.12.11:
+    resolution:
+      integrity: sha512-np/lG3uARFybkoHokJUmf1QfEvRVCPbmQeUQpKow5cQ3xWrV9i3rUHodKDJPQfTVX61qKi+UdYk8kik84n7XOw==
   /@babel/helper-validator-option/7.12.1:
     dev: true
     resolution:
@@ -801,6 +805,13 @@ packages:
       js-tokens: 4.0.0
     resolution:
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     dev: true
@@ -5729,10 +5789,21 @@ packages:
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       json-parse-even-better-errors: 2.3.1
       lines-and-columns: 1.1.6
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@@ -6373,7 +6444,7 @@ packages:
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-      parse-json: 5.1.0
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-  /serialize-error/2.1.0:
+  /semver/7.3.4:
+    dependencies:
+      lru-cache: 6.0.0
     dev: true
     engines:
-      node: '>=0.10.0'
+      node: '>=10'
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+  /serialize-error/7.0.1:
+    dependencies:
+      type-fest: 0.13.1
+    dev: true
+    engines:
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       spdx-expression-parse: 3.0.1
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       spdx-exceptions: 2.3.0
-      spdx-license-ids: 3.0.6
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-  /supertap/1.0.0:
+  /supertap/2.0.0:
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-      indent-string: 3.2.0
-      js-yaml: 3.14.0
-      serialize-error: 2.1.0
-      strip-ansi: 4.0.0
+      arrify: 2.0.1
+      indent-string: 4.0.0
+      js-yaml: 3.14.1
+      serialize-error: 7.0.1
+      strip-ansi: 6.0.0
     dev: true
     engines:
-      node: '>=4'
+      node: '>=10'
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-  /tslib/2.0.3:
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+  /type-fest/0.20.2:
+    dev: true
+    engines:
+      node: '>=10'
+    resolution:
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   /type-fest/0.3.1:
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-  /update-notifier/4.1.3:
+  /update-notifier/5.1.0:
     dependencies:
-      boxen: 4.2.0
-      chalk: 3.0.0
+      boxen: 5.0.0
+      chalk: 4.1.0
       configstore: 5.0.1
       has-yarn: 2.1.0
       import-lazy: 2.1.0
       is-ci: 2.0.0
-      is-installed-globally: 0.3.2
-      is-npm: 4.0.0
+      is-installed-globally: 0.4.0
+      is-npm: 5.0.0
       is-yarn-global: 0.3.0
       latest-version: 5.1.0
       pupa: 2.1.1
+      semver: 7.3.4
       semver-diff: 3.1.1
       xdg-basedir: 4.0.0
     dev: true
     engines:
-      node: '>=8'
+      node: '>=10'
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     dependencies:
       punycode: 2.1.1
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+  /yallist/4.0.0:
+    dev: true
+    resolution:
+      integrity: sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==
   /yaml/1.10.0:
     dev: true
     engines:
@@ -7651,12 +7723,12 @@ packages:
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-  /yargs-parser/20.2.3:
+  /yargs-parser/20.2.4:
     dev: true
     engines:
       node: '>=10'
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   /yargs/15.4.1:
     dependencies:
       cliui: 6.0.0
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-  /yargs/16.1.0:
+  /yargs/16.2.0:
     dependencies:
-      cliui: 7.0.3
+      cliui: 7.0.4
       escalade: 3.1.1
       get-caller-file: 2.0.5
       require-directory: 2.1.1
       string-width: 4.2.0
       y18n: 5.0.5
-      yargs-parser: 20.2.3
+      yargs-parser: 20.2.4
     dev: true
     engines:
       node: '>=10'
     resolution:
-      integrity: sha512-upWFJOmDdHN0syLuESuvXDmrRcWd1QafJolHskzaw79uZa7/x53gxQKiR07W59GWY1tFhhU/Th9DrtSfpS782g==
+      integrity: sha512-D1mvvtDG0L5ft/jGWkLpG1+m0eQxOfaBvTNELraWj22wSVUMWxZUvYgJYcKh6jGGIkJFhH4IZPQhR4TKpc8mBw==
   /yn/3.1.1:
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     engines:
diff --git a/util/test.d.ts b/util/test.d.ts
index a528fc829..4bce4b0b6 100644
--- a/util/test.d.ts
+++ b/util/test.d.ts
@@ -15,10 +15,14 @@ interface GetCode {
 
 export const getCode: GetCode;
 
+export function evaluateBundle(bundle: RollupBuild): Promise<Pick<NodeModule, 'exports'>>;
+
 export function getImports(bundle: RollupBuild): Promise<string[]>;
 
 export function getResolvedModules(bundle: RollupBuild): Promise<Record<string, string>>;
 
+export function onwarn(warning: string | any): void;
+
 export function testBundle(
   t: Assertions,
   bundle: RollupBuild,
diff --git a/util/test.js b/util/test.js
index ed79ca3fc..d6b6693e7 100644
--- a/util/test.js
+++ b/util/test.js
@@ -30,6 +30,9 @@ const getResolvedModules = async (bundle) => {
   return modules;
 };
 
+// eslint-disable-next-line no-console
+const onwarn = (warning) => console.warn(warning.toString());
+
 /**
  * @param {import('ava').Assertions} t
  * @param {import('rollup').RollupBuild} bundle
@@ -59,9 +62,16 @@ const testBundle = async (t, bundle, args = {}) => {
   return { code, error, module, result };
 };
 
+const evaluateBundle = async (bundle) => {
+  const { module } = await testBundle(null, bundle);
+  return module.exports;
+};
+
 module.exports = {
+  evaluateBundle,
   getCode,
   getImports,
   getResolvedModules,
+  onwarn,
   testBundle
 };