From 9da2f9cd0dd1193fdbdedb13fc7389ac43e460ab Mon Sep 17 00:00:00 2001
From: Christoph Tavan <dev@tavan.de>
Date: Tue, 19 May 2020 00:15:01 +0200
Subject: [PATCH] Handle ERR_PACKAGE_PATH_NOT_EXPORTED gracefully

Fixes #104
Closes #108
---
 index.js                                         |  4 ++++
 .../esm-module-without-svelte-config/index.js    |  0
 .../package.json                                 |  6 ++++++
 test/node_modules/esm-widget/index.js            |  0
 test/node_modules/esm-widget/package.json        |  8 ++++++++
 test/node_modules/esm-widget/src/Widget.html     |  1 +
 test/test.js                                     | 16 ++++++++++++++++
 7 files changed, 35 insertions(+)
 create mode 100644 test/node_modules/esm-module-without-svelte-config/index.js
 create mode 100644 test/node_modules/esm-module-without-svelte-config/package.json
 create mode 100644 test/node_modules/esm-widget/index.js
 create mode 100644 test/node_modules/esm-widget/package.json
 create mode 100644 test/node_modules/esm-widget/src/Widget.html

diff --git a/index.js b/index.js
index 0d52cfb..5009f60 100644
--- a/index.js
+++ b/index.js
@@ -50,6 +50,10 @@ function tryResolve(pkg, importer) {
 		return relative.resolve(pkg, importer);
 	} catch (err) {
 		if (err.code === 'MODULE_NOT_FOUND') return null;
+		if (err.code === 'ERR_PACKAGE_PATH_NOT_EXPORTED') {
+			console.warn(`WARNING: Could not read svelte config from ${pkg}. Reason: ${err.message}`);
+			return null;
+		}
 		throw err;
 	}
 }
diff --git a/test/node_modules/esm-module-without-svelte-config/index.js b/test/node_modules/esm-module-without-svelte-config/index.js
new file mode 100644
index 0000000..e69de29
diff --git a/test/node_modules/esm-module-without-svelte-config/package.json b/test/node_modules/esm-module-without-svelte-config/package.json
new file mode 100644
index 0000000..f30f103
--- /dev/null
+++ b/test/node_modules/esm-module-without-svelte-config/package.json
@@ -0,0 +1,6 @@
+{
+	"main": "./index.js",
+	"exports": {
+		".": "./index.js"
+	}
+}
diff --git a/test/node_modules/esm-widget/index.js b/test/node_modules/esm-widget/index.js
new file mode 100644
index 0000000..e69de29
diff --git a/test/node_modules/esm-widget/package.json b/test/node_modules/esm-widget/package.json
new file mode 100644
index 0000000..d5d6d33
--- /dev/null
+++ b/test/node_modules/esm-widget/package.json
@@ -0,0 +1,8 @@
+{
+	"main": "./index.js",
+	"svelte": "src/Widget.html",
+	"exports": {
+		".": "./index.js",
+		"./package.json": "./package.json"
+	}
+}
diff --git a/test/node_modules/esm-widget/src/Widget.html b/test/node_modules/esm-widget/src/Widget.html
new file mode 100644
index 0000000..9b44ef5
--- /dev/null
+++ b/test/node_modules/esm-widget/src/Widget.html
@@ -0,0 +1 @@
+<p>i am a widget</p>
\ No newline at end of file
diff --git a/test/test.js b/test/test.js
index c48e0e0..f96c26f 100644
--- a/test/test.js
+++ b/test/test.js
@@ -33,6 +33,22 @@ describe('rollup-plugin-svelte', () => {
 		);
 	});
 
+	it('ignores esm module not exporting package.json', () => {
+		const { resolveId } = plugin();
+		assert.equal(
+			resolveId('esm-module-without-svelte-config', path.resolve('test/foo/main.js')),
+			null
+		);
+	});
+
+	it('resolves esm module exporting package.json', () => {
+		const { resolveId } = plugin();
+		assert.equal(
+			resolveId('esm-widget', path.resolve('test/foo/main.js')),
+			path.resolve('test/node_modules/esm-widget/src/Widget.html')
+		);
+	});
+
 	it('ignores virtual modules', () => {
 		const { resolveId } = plugin();
 		assert.equal(