feat: Support customizing the modern output via "exports" (#784)

* feat: Support customizing the modern output via "exports" * docs: Adding changeset * refactor: Further support "modern" output name with exports object Co-authored-by: Jason Miller <developit@users.noreply.github.com> * fix: Correcting odd typo Co-authored-by: Jason Miller <developit@users.noreply.github.com>
developit · Jun 3, 2021 · 86371f0 · 86371f0
1 parent 2b37c12
commit 86371f0
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diff --git a/.changeset/tender-pants-film.md b/.changeset/tender-pants-film.md
@@ -0,0 +1,5 @@
+---
+'microbundle': patch
+---
+
+Allows users to customize the modern output's filename using "exports" like they can with "esmodules"
diff --git a/src/index.js b/src/index.js
@@ -256,6 +256,11 @@ function replaceName(filename, name) {
 	);
 }
 
+function walk(exports) {
+	if (typeof exports === 'string') return exports;
+	return walk(exports['.'] || exports.import || exports.module);
+}
+
 function getMain({ options, entry, format }) {
 	const { pkg } = options;
 	const pkgMain = options['pkg-main'];
@@ -287,7 +292,10 @@ function getMain({ options, entry, format }) {
 		mainNoExtension,
 	);
 	mainsByFormat.modern = replaceName(
-		(pkg.syntax && pkg.syntax.esmodules) || pkg.esmodule || 'x.modern.js',
+		(pkg.exports && walk(pkg.exports)) ||
+			(pkg.syntax && pkg.syntax.esmodules) ||
+			pkg.esmodule ||
+			'x.modern.js',
 		mainNoExtension,
 	);
 	mainsByFormat.cjs = replaceName(