fix: identify ESM in empty export file (#429)

privatenumber · Dec 2, 2023 · 01592a7 · 01592a7
1 parent c80cc50
commit 01592a7
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Showing 2 changed files with 4 additions and 3 deletions.
diff --git a/src/utils/esm-pattern.ts b/src/utils/esm-pattern.ts
@@ -23,8 +23,8 @@ const esmPattern = /\b(?:import|export)\b/;
 export const isESM = (code: string) => {
 	if (code.includes('import') || code.includes('export')) {
 		try {
-			const [imports, exports] = parseEsm(code);
-			return imports.length > 0 || exports.length > 0;
+			const hasModuleSyntax = parseEsm(code)[3];
+			return hasModuleSyntax;
 		} catch {
 			/**
 			 * If it fails to parse, there's a syntax error

diff --git a/tests/specs/smoke.ts b/tests/specs/smoke.ts
@@ -230,7 +230,8 @@ const files = {
 				type: 'module',
 				exports: './index.js',
 			}),
-			'index.js': syntaxLowering,
+			'index.js': `${syntaxLowering}\nexport * from "./empty-export.js"`,
+			'empty-export.js': 'export {}',
 		},
 	},