fix: access document.currentScript at the top level (#5118)

* fix: access document.currentScript at the top level * add test * update snapshots * add the option accessedDocumentCurrentScript to RenderOptions
rollup · Sep 10, 2023 · bec9e07 · bec9e07
1 parent 1d0c6be
commit bec9e07
Show file tree

Hide file tree

Showing 21 changed files with 96 additions and 34 deletions.
diff --git a/src/Chunk.ts b/src/Chunk.ts
@@ -6,6 +6,7 @@ import Module from './Module';
 import ExportDefaultDeclaration from './ast/nodes/ExportDefaultDeclaration';
 import FunctionDeclaration from './ast/nodes/FunctionDeclaration';
 import type ImportExpression from './ast/nodes/ImportExpression';
+import { formatsMaybeAccessDocumentCurrentScript } from './ast/nodes/MetaProperty';
 import type ChildScope from './ast/scopes/ChildScope';
 import ExportDefaultVariable from './ast/variables/ExportDefaultVariable';
 import LocalVariable from './ast/variables/LocalVariable';
@@ -40,6 +41,7 @@ import { replacePlaceholders } from './utils/hashPlaceholders';
 import { makeLegal } from './utils/identifierHelpers';
 import {
 	defaultInteropHelpersByInteropType,
+	DOCUMENT_CURRENT_SCRIPT,
 	HELPER_NAMES,
 	isDefaultAProperty,
 	namespaceInteropHelpersByInteropType
@@ -1201,6 +1203,7 @@ export default class Chunk {
 		const renderedModuleSources = new Map<Module, MagicString>();
 
 		const renderOptions: RenderOptions = {
+			accessedDocumentCurrentScript: false,
 			dynamicImportFunction,
 			exportNamesByVariable,
 			format,
@@ -1218,6 +1221,14 @@ export default class Chunk {
 			let source: MagicString | undefined;
 			if (module.isIncluded() || includedNamespaces.has(module)) {
 				const rendered = module.render(renderOptions);
+				if (
+					!renderOptions.accessedDocumentCurrentScript &&
+					formatsMaybeAccessDocumentCurrentScript.includes(format)
+				) {
+					// eslint-disable-next-line unicorn/consistent-destructuring
+					this.accessedGlobalsByScope.get(module.scope)?.delete(DOCUMENT_CURRENT_SCRIPT);
+				}
+				renderOptions.accessedDocumentCurrentScript = false;
 				({ source } = rendered);
 				usesTopLevelAwait ||= rendered.usesTopLevelAwait;
 				renderedLength = source.length();

diff --git a/src/ast/nodes/MetaProperty.ts b/src/ast/nodes/MetaProperty.ts
@@ -3,6 +3,7 @@ import type { InternalModuleFormat } from '../../rollup/types';
 import type { PluginDriver } from '../../utils/PluginDriver';
 import { escapeId } from '../../utils/escapeId';
 import type { GenerateCodeSnippets } from '../../utils/generateCodeSnippets';
+import { DOCUMENT_CURRENT_SCRIPT } from '../../utils/interopHelpers';
 import { dirname, normalize, relative } from '../../utils/path';
 import type { RenderOptions } from '../../utils/renderHelpers';
 import type { NodeInteraction } from '../NodeInteractions';
@@ -62,11 +63,10 @@ export default class MetaProperty extends NodeBase {
 		}
 	}
 
-	render(code: MagicString, { format, pluginDriver, snippets }: RenderOptions): void {
+	render(code: MagicString, renderOptions: RenderOptions): void {
+		const { format, pluginDriver, snippets } = renderOptions;
 		const {
-			context: {
-				module: { id: moduleId }
-			},
+			context: { module },
 			meta: { name },
 			metaProperty,
 			parent,
@@ -75,6 +75,8 @@ export default class MetaProperty extends NodeBase {
 			start,
 			end
 		} = this;
+		const { id: moduleId } = module;
+
 		if (name !== IMPORT) return;
 		const chunkId = preliminaryChunkId!;
 
@@ -95,11 +97,15 @@ export default class MetaProperty extends NodeBase {
 			return;
 		}
 
-		const replacement =
-			pluginDriver.hookFirstSync('resolveImportMeta', [
-				metaProperty,
-				{ chunkId, format, moduleId }
-			]) || importMetaMechanisms[format]?.(metaProperty, { chunkId, snippets });
+		let replacement = pluginDriver.hookFirstSync('resolveImportMeta', [
+			metaProperty,
+			{ chunkId, format, moduleId }
+		]);
+		if (!replacement) {
+			replacement = importMetaMechanisms[format]?.(metaProperty, { chunkId, snippets });
+			renderOptions.accessedDocumentCurrentScript ||=
+				formatsMaybeAccessDocumentCurrentScript.includes(format) && replacement !== 'undefined';
+		}
 		if (typeof replacement === 'string') {
 			if (parent instanceof MemberExpression) {
 				code.overwrite(parent.start, parent.end, replacement, { contentOnly: true });
@@ -124,13 +130,15 @@ export default class MetaProperty extends NodeBase {
 	}
 }
 
+export const formatsMaybeAccessDocumentCurrentScript = ['cjs', 'iife', 'umd'];
+
 const accessedMetaUrlGlobals = {
 	amd: ['document', 'module', 'URL'],
-	cjs: ['document', 'require', 'URL'],
+	cjs: ['document', 'require', 'URL', DOCUMENT_CURRENT_SCRIPT],
 	es: [],
-	iife: ['document', 'URL'],
+	iife: ['document', 'URL', DOCUMENT_CURRENT_SCRIPT],
 	system: ['module'],
-	umd: ['document', 'require', 'URL']
+	umd: ['document', 'require', 'URL', DOCUMENT_CURRENT_SCRIPT]
 };
 
 const accessedFileUrlGlobals = {
@@ -170,7 +178,7 @@ const getFileUrlFromRelativePath = (path: string) =>
 const getUrlFromDocument = (chunkId: string, umd = false) =>
 	`${
 		umd ? `typeof document === 'undefined' ? location.href : ` : ''
-	}(document.currentScript && document.currentScript.src || new URL('${escapeId(
+	}(${DOCUMENT_CURRENT_SCRIPT} && ${DOCUMENT_CURRENT_SCRIPT}.src || new URL('${escapeId(
 		chunkId
 	)}', document.baseURI).href)`;
 

diff --git a/src/utils/interopHelpers.ts b/src/utils/interopHelpers.ts
@@ -8,6 +8,7 @@ const INTEROP_NAMESPACE_COMPAT_VARIABLE = '_interopNamespaceCompat';
 const INTEROP_NAMESPACE_DEFAULT_VARIABLE = '_interopNamespaceDefault';
 export const INTEROP_NAMESPACE_DEFAULT_ONLY_VARIABLE = '_interopNamespaceDefaultOnly';
 export const MERGE_NAMESPACES_VARIABLE = '_mergeNamespaces';
+export const DOCUMENT_CURRENT_SCRIPT = '_documentCurrentScript';
 
 export const defaultInteropHelpersByInteropType: { [T in InteropType]: string | null } = {
 	auto: INTEROP_DEFAULT_VARIABLE,
@@ -76,6 +77,9 @@ const HELPER_GENERATORS: {
 		usedHelpers: ReadonlySet<string>
 	) => string;
 } = {
+	[DOCUMENT_CURRENT_SCRIPT](_t, { _, n }) {
+		return `var${_}${DOCUMENT_CURRENT_SCRIPT}${_}=${_}typeof${_}document${_}!==${_}'undefined'${_}?${_}document.currentScript${_}:${_}null;${n}`;
+	},
 	[INTEROP_DEFAULT_COMPAT_VARIABLE](_t, snippets, liveBindings) {
 		const { _, getDirectReturnFunction, n } = snippets;
 		const [left, right] = getDirectReturnFunction(['e'], {

diff --git a/src/utils/renderHelpers.ts b/src/utils/renderHelpers.ts
@@ -7,6 +7,7 @@ import type { GenerateCodeSnippets } from './generateCodeSnippets';
 import { treeshakeNode } from './treeshakeNode';
 
 export interface RenderOptions {
+	accessedDocumentCurrentScript: boolean;
 	dynamicImportFunction: string | undefined;
 	exportNamesByVariable: Map<Variable, string[]>;
 	format: InternalModuleFormat;

diff --git a/test/chunking-form/samples/import-meta-numeric-paths/_expected/cjs/0/1/nested.js b/test/chunking-form/samples/import-meta-numeric-paths/_expected/cjs/0/1/nested.js
@@ -1,5 +1,6 @@
 'use strict';
 
-const url = (typeof document === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : (document.currentScript && document.currentScript.src || new URL('0/1/nested.js', document.baseURI).href));
+var _documentCurrentScript = typeof document !== 'undefined' ? document.currentScript : null;
+const url = (typeof document === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : (_documentCurrentScript && _documentCurrentScript.src || new URL('0/1/nested.js', document.baseURI).href));
 
 exports.url = url;
diff --git a/test/chunking-form/samples/import-meta-url/_expected/cjs/main.js b/test/chunking-form/samples/import-meta-url/_expected/cjs/main.js
@@ -1,5 +1,6 @@
 'use strict';
 
+var _documentCurrentScript = typeof document !== 'undefined' ? document.currentScript : null;
 function log(url) {
 	if (typeof document === 'undefined') {
 		console.log(url);
@@ -8,7 +9,7 @@ function log(url) {
 	}
 }
 
-log('main: ' + (typeof document === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : (document.currentScript && document.currentScript.src || new URL('main.js', document.baseURI).href)));
+log('main: ' + (typeof document === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : (_documentCurrentScript && _documentCurrentScript.src || new URL('main.js', document.baseURI).href)));
 Promise.resolve().then(function () { return require('./nested/chunk.js'); });
 
 exports.log = log;
diff --git a/test/chunking-form/samples/import-meta-url/_expected/cjs/nested/chunk.js b/test/chunking-form/samples/import-meta-url/_expected/cjs/nested/chunk.js
@@ -2,4 +2,5 @@
 
 var main = require('../main.js');
 
-main.log('nested: ' + (typeof document === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : (document.currentScript && document.currentScript.src || new URL('nested/chunk.js', document.baseURI).href)));
+var _documentCurrentScript = typeof document !== 'undefined' ? document.currentScript : null;
+main.log('nested: ' + (typeof document === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : (_documentCurrentScript && _documentCurrentScript.src || new URL('nested/chunk.js', document.baseURI).href)));
diff --git a/test/form/samples/deconflict-format-specific-globals/_expected/cjs.js b/test/form/samples/deconflict-format-specific-globals/_expected/cjs.js
@@ -2,6 +2,7 @@
 
 var external = require('external');
 
+var _documentCurrentScript = typeof document !== 'undefined' ? document.currentScript : null;
 function _interopDefault (e) { return e && e.__esModule ? e : { default: e }; }
 
 function _interopNamespace(e) {
@@ -37,7 +38,7 @@ console.log(_interopDefault$1, _interopNamespace$1, module$1, require$1, exports
 
 Promise.resolve().then(function () { return /*#__PURE__*/_interopNamespace(require('external')); }).then(console.log);
 exports.default = 0;
-console.log((typeof document === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : (document.currentScript && document.currentScript.src || new URL('cjs.js', document.baseURI).href)));
+console.log((typeof document === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : (_documentCurrentScript && _documentCurrentScript.src || new URL('cjs.js', document.baseURI).href)));
 
 function nested1() {
 	const _interopDefault = 1;
@@ -51,7 +52,7 @@ function nested1() {
 
 	Promise.resolve().then(function () { return /*#__PURE__*/_interopNamespace(require('external')); }).then(console.log);
 	exports.default = 1;
-	console.log((typeof document === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : (document.currentScript && document.currentScript.src || new URL('cjs.js', document.baseURI).href)));
+	console.log((typeof document === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : (_documentCurrentScript && _documentCurrentScript.src || new URL('cjs.js', document.baseURI).href)));
 }
 
 nested1();

diff --git a/test/form/samples/deconflict-format-specific-globals/_expected/iife.js b/test/form/samples/deconflict-format-specific-globals/_expected/iife.js
@@ -1,6 +1,7 @@
 var bundle = (function (external) {
 	'use strict';
 
+	var _documentCurrentScript = typeof document !== 'undefined' ? document.currentScript : null;
 	function _interopDefault (e) { return e && e.__esModule ? e : { default: e }; }
 
 	var external__default = /*#__PURE__*/_interopDefault(external);
@@ -18,7 +19,7 @@ var bundle = (function (external) {
 
 	import('external').then(console.log);
 	exports.default = 0;
-	console.log((document.currentScript && document.currentScript.src || new URL('iife.js', document.baseURI).href));
+	console.log((_documentCurrentScript && _documentCurrentScript.src || new URL('iife.js', document.baseURI).href));
 
 	function nested1() {
 		const _interopDefault = 1;
@@ -32,7 +33,7 @@ var bundle = (function (external) {
 
 		import('external').then(console.log);
 		exports.default = 1;
-		console.log((document.currentScript && document.currentScript.src || new URL('iife.js', document.baseURI).href));
+		console.log((_documentCurrentScript && _documentCurrentScript.src || new URL('iife.js', document.baseURI).href));
 	}
 
 	nested1();

diff --git a/test/form/samples/deconflict-format-specific-globals/_expected/umd.js b/test/form/samples/deconflict-format-specific-globals/_expected/umd.js
@@ -4,6 +4,7 @@
 	(global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.bundle = factory(global.external));
 })(this, (function (external) { 'use strict';
 
+	var _documentCurrentScript = typeof document !== 'undefined' ? document.currentScript : null;
 	function _interopDefault (e) { return e && e.__esModule ? e : { default: e }; }
 
 	var external__default = /*#__PURE__*/_interopDefault(external);
@@ -21,7 +22,7 @@
 
 	import('external').then(console.log);
 	exports.default = 0;
-	console.log((typeof document === 'undefined' && typeof location === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : typeof document === 'undefined' ? location.href : (document.currentScript && document.currentScript.src || new URL('umd.js', document.baseURI).href)));
+	console.log((typeof document === 'undefined' && typeof location === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : typeof document === 'undefined' ? location.href : (_documentCurrentScript && _documentCurrentScript.src || new URL('umd.js', document.baseURI).href)));
 
 	function nested1() {
 		const _interopDefault = 1;
@@ -35,7 +36,7 @@
 
 		import('external').then(console.log);
 		exports.default = 1;
-		console.log((typeof document === 'undefined' && typeof location === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : typeof document === 'undefined' ? location.href : (document.currentScript && document.currentScript.src || new URL('umd.js', document.baseURI).href)));
+		console.log((typeof document === 'undefined' && typeof location === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : typeof document === 'undefined' ? location.href : (_documentCurrentScript && _documentCurrentScript.src || new URL('umd.js', document.baseURI).href)));
 	}
 
 	nested1();

diff --git a/test/form/samples/import-meta-url/_expected/cjs.js b/test/form/samples/import-meta-url/_expected/cjs.js
@@ -1,5 +1,6 @@
 'use strict';
 
+var _documentCurrentScript = typeof document !== 'undefined' ? document.currentScript : null;
 function log(url) {
 	if (typeof document === 'undefined') {
 		console.log(url);
@@ -8,4 +9,4 @@ function log(url) {
 	}
 }
 
-log((typeof document === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : (document.currentScript && document.currentScript.src || new URL('cjs.js', document.baseURI).href)));
+log((typeof document === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : (_documentCurrentScript && _documentCurrentScript.src || new URL('cjs.js', document.baseURI).href)));
diff --git a/test/form/samples/import-meta-url/_expected/iife.js b/test/form/samples/import-meta-url/_expected/iife.js
@@ -1,6 +1,7 @@
 (function () {
 	'use strict';
 
+	var _documentCurrentScript = typeof document !== 'undefined' ? document.currentScript : null;
 	function log(url) {
 		if (typeof document === 'undefined') {
 			console.log(url);
@@ -9,6 +10,6 @@
 		}
 	}
 
-	log((document.currentScript && document.currentScript.src || new URL('iife.js', document.baseURI).href));
+	log((_documentCurrentScript && _documentCurrentScript.src || new URL('iife.js', document.baseURI).href));
 
 })();
diff --git a/test/form/samples/import-meta-url/_expected/umd.js b/test/form/samples/import-meta-url/_expected/umd.js
@@ -3,6 +3,7 @@
 	factory();
 })((function () { 'use strict';
 
+	var _documentCurrentScript = typeof document !== 'undefined' ? document.currentScript : null;
 	function log(url) {
 		if (typeof document === 'undefined') {
 			console.log(url);
@@ -11,6 +12,6 @@
 		}
 	}
 
-	log((typeof document === 'undefined' && typeof location === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : typeof document === 'undefined' ? location.href : (document.currentScript && document.currentScript.src || new URL('umd.js', document.baseURI).href)));
+	log((typeof document === 'undefined' && typeof location === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : typeof document === 'undefined' ? location.href : (_documentCurrentScript && _documentCurrentScript.src || new URL('umd.js', document.baseURI).href)));
 
 }));
diff --git a/test/form/samples/import-meta/_expected/cjs.js b/test/form/samples/import-meta/_expected/cjs.js
@@ -1,3 +1,4 @@
 'use strict';
 
-console.log(({ url: (typeof document === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : (document.currentScript && document.currentScript.src || new URL('cjs.js', document.baseURI).href)) }));
+var _documentCurrentScript = typeof document !== 'undefined' ? document.currentScript : null;
+console.log(({ url: (typeof document === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : (_documentCurrentScript && _documentCurrentScript.src || new URL('cjs.js', document.baseURI).href)) }));
diff --git a/test/form/samples/import-meta/_expected/iife.js b/test/form/samples/import-meta/_expected/iife.js
@@ -1,6 +1,7 @@
 (function () {
 	'use strict';
 
-	console.log(({ url: (document.currentScript && document.currentScript.src || new URL('iife.js', document.baseURI).href) }));
+	var _documentCurrentScript = typeof document !== 'undefined' ? document.currentScript : null;
+	console.log(({ url: (_documentCurrentScript && _documentCurrentScript.src || new URL('iife.js', document.baseURI).href) }));
 
 })();
diff --git a/test/form/samples/import-meta/_expected/umd.js b/test/form/samples/import-meta/_expected/umd.js
@@ -3,6 +3,7 @@
 	factory();
 })((function () { 'use strict';
 
-	console.log(({ url: (typeof document === 'undefined' && typeof location === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : typeof document === 'undefined' ? location.href : (document.currentScript && document.currentScript.src || new URL('umd.js', document.baseURI).href)) }));
+	var _documentCurrentScript = typeof document !== 'undefined' ? document.currentScript : null;
+	console.log(({ url: (typeof document === 'undefined' && typeof location === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : typeof document === 'undefined' ? location.href : (_documentCurrentScript && _documentCurrentScript.src || new URL('umd.js', document.baseURI).href)) }));
 
 }));
diff --git a/test/form/samples/resolve-import-meta-url/_expected/cjs.js b/test/form/samples/resolve-import-meta-url/_expected/cjs.js
@@ -1,12 +1,13 @@
 'use strict';
 
+var _documentCurrentScript = typeof document !== 'undefined' ? document.currentScript : null;
 console.log('resolved');
 console.log('resolved');
 console.log('resolved');
 
-console.log((typeof document === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : (document.currentScript && document.currentScript.src || new URL('cjs.js', document.baseURI).href)));
+console.log((typeof document === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : (_documentCurrentScript && _documentCurrentScript.src || new URL('cjs.js', document.baseURI).href)));
 console.log(undefined);
-console.log(({ url: (typeof document === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : (document.currentScript && document.currentScript.src || new URL('cjs.js', document.baseURI).href)) }));
+console.log(({ url: (typeof document === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : (_documentCurrentScript && _documentCurrentScript.src || new URL('cjs.js', document.baseURI).href)) }));
 
 console.log('url=cjs.js:resolve-import-meta-url/main.js');
 console.log('privateProp=cjs.js:resolve-import-meta-url/main.js');

diff --git a/test/form/samples/resolve-import-meta-url/_expected/iife.js b/test/form/samples/resolve-import-meta-url/_expected/iife.js
@@ -1,13 +1,14 @@
 (function () {
 	'use strict';
 
+	var _documentCurrentScript = typeof document !== 'undefined' ? document.currentScript : null;
 	console.log('resolved');
 	console.log('resolved');
 	console.log('resolved');
 
-	console.log((document.currentScript && document.currentScript.src || new URL('iife.js', document.baseURI).href));
+	console.log((_documentCurrentScript && _documentCurrentScript.src || new URL('iife.js', document.baseURI).href));
 	console.log(undefined);
-	console.log(({ url: (document.currentScript && document.currentScript.src || new URL('iife.js', document.baseURI).href) }));
+	console.log(({ url: (_documentCurrentScript && _documentCurrentScript.src || new URL('iife.js', document.baseURI).href) }));
 
 	console.log('url=iife.js:resolve-import-meta-url/main.js');
 	console.log('privateProp=iife.js:resolve-import-meta-url/main.js');

diff --git a/test/form/samples/resolve-import-meta-url/_expected/umd.js b/test/form/samples/resolve-import-meta-url/_expected/umd.js
@@ -3,13 +3,14 @@
 	factory();
 })((function () { 'use strict';
 
+	var _documentCurrentScript = typeof document !== 'undefined' ? document.currentScript : null;
 	console.log('resolved');
 	console.log('resolved');
 	console.log('resolved');
 
-	console.log((typeof document === 'undefined' && typeof location === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : typeof document === 'undefined' ? location.href : (document.currentScript && document.currentScript.src || new URL('umd.js', document.baseURI).href)));
+	console.log((typeof document === 'undefined' && typeof location === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : typeof document === 'undefined' ? location.href : (_documentCurrentScript && _documentCurrentScript.src || new URL('umd.js', document.baseURI).href)));
 	console.log(undefined);
-	console.log(({ url: (typeof document === 'undefined' && typeof location === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : typeof document === 'undefined' ? location.href : (document.currentScript && document.currentScript.src || new URL('umd.js', document.baseURI).href)) }));
+	console.log(({ url: (typeof document === 'undefined' && typeof location === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : typeof document === 'undefined' ? location.href : (_documentCurrentScript && _documentCurrentScript.src || new URL('umd.js', document.baseURI).href)) }));
 
 	console.log('url=umd.js:resolve-import-meta-url/main.js');
 	console.log('privateProp=umd.js:resolve-import-meta-url/main.js');

diff --git a/test/function/samples/import-meta-url-b/_config.js b/test/function/samples/import-meta-url-b/_config.js
@@ -0,0 +1,17 @@
+const assert = require('node:assert');
+
+const source = 'example.com/main.js';
+
+module.exports = defineTest({
+	description: 'Access document.currentScript at the top level',
+	context: {
+		document: {
+			currentScript: {
+				src: source
+			}
+		}
+	},
+	exports(exports) {
+		assert.strictEqual(exports(), source);
+	}
+});