Demonstrate inability to tree shake any modules that

are resolved by a plugin.

internal/bundler/bundler_dce_test.go

@@ -1,9 +1,13 @@
 package bundler
 
 import (
+	"path/filepath"
+	"regexp"
+	"strings"
 	"testing"
 
 	"github.com/evanw/esbuild/internal/config"
+	"github.com/evanw/esbuild/internal/logger"
 )
 
 var dce_suite = suite{
@@ -1655,3 +1659,77 @@ func TestTreeShakingInESMWrapper(t *testing.T) {
 		},
 	})
 }
+
+func TestPackageJsonSideEffectsFalsePluginResolver(t *testing.T) {
+	pk2Index := `
+		export {default as Cmp1} from './cmp1.vue';
+		export {default as Cmp2} from './cmp2';
+	`
+
+	testPackageJsonSideEffectsFalsePluginResolver(t, pk2Index)
+}
+
+func TestPackageJsonSideEffectsFalseNoPlugins(t *testing.T) {
+	pk2Index := `
+		export {default as Cmp1} from './cmp1';
+		export {default as Cmp2} from './cmp2';
+	`
+
+	testPackageJsonSideEffectsFalsePluginResolver(t, pk2Index)
+}
+
+func testPackageJsonSideEffectsFalsePluginResolver(t *testing.T, pkg2Index string) {
+	t.Helper()
+
+	mockFiles := map[string]string{
+		"/Users/user/project/src/entry.js": `
+			import {Cmp2} from "demo-pkg2"
+			console.log(Cmp2);
+		`,
+		"/Users/user/project/node_modules/demo-pkg2/cmp1.js": `
+			import {__decorate} from './helper';
+			let Something = {}
+			__decorate(Something);
+			export default Something;
+		`,
+		"/Users/user/project/node_modules/demo-pkg2/cmp2.js": `
+			import {__decorate} from './helper';
+			class Something {}
+			__decorate(Something);
+			export default Something;
+		`,
+		"/Users/user/project/node_modules/demo-pkg2/helper.js": `
+			export function __decorate(s) {
+			}
+		`,
+		"/Users/user/project/node_modules/demo-pkg2/package.json": `
+			{
+				"sideEffects": false
+			}
+		`,
+		"/Users/user/project/node_modules/demo-pkg2/index.js": pkg2Index,
+	}
+
+	dce_suite.expectBundled(t, bundled{
+		files:      mockFiles,
+		entryPaths: []string{"/Users/user/project/src/entry.js"},
+		options: config.Options{
+			Mode:          config.ModeBundle,
+			AbsOutputFile: "/out.js",
+			Plugins: []config.Plugin{
+				{
+					OnResolve: []config.OnResolve{
+						{
+							Filter: regexp.MustCompile("\\.vue$"),
+							Callback: func(ora config.OnResolveArgs) config.OnResolveResult {
+								return config.OnResolveResult{
+									Path: logger.Path{Text: filepath.Join(ora.ResolveDir, strings.Replace(ora.Path, ".vue", ".js", 1))},
+								}
+							},
+						},
+					},
+				},
+			},
+		},
+	})
+}

internal/bundler/snapshots/snapshots_dce.txt

@@ -414,6 +414,22 @@ console.log("hello");
 // Users/user/project/src/entry.js
 console.log(demo_pkg_exports);
 
+================================================================================
+TestPackageJsonSideEffectsFalseNoPlugins
+---------- /out.js ----------
+// Users/user/project/node_modules/demo-pkg2/helper.js
+function __decorate(s) {
+}
+
+// Users/user/project/node_modules/demo-pkg2/cmp2.js
+var Something = class {
+};
+__decorate(Something);
+var cmp2_default = Something;
+
+// Users/user/project/src/entry.js
+console.log(cmp2_default);
+
 ================================================================================
 TestPackageJsonSideEffectsFalseNoWarningInNodeModulesIssue999
 ---------- /out.js ----------
@@ -462,6 +478,22 @@ var init_a = __esm({
 // Users/user/project/src/entry.js
 Promise.resolve().then(() => (init_a(), a_exports)).then((x) => assert(x.foo === "foo"));
 
+================================================================================
+TestPackageJsonSideEffectsFalsePluginResolver
+---------- /out.js ----------
+// Users/user/project/node_modules/demo-pkg2/helper.js
+function __decorate(s) {
+}
+
+// Users/user/project/node_modules/demo-pkg2/cmp2.js
+var Something2 = class {
+};
+__decorate(Something2);
+var cmp2_default = Something2;
+
+// Users/user/project/src/entry.js
+console.log(cmp2_default);
+
 ================================================================================
 TestPackageJsonSideEffectsFalseRemoveBareImportCommonJS
 ---------- /out.js ----------