fix: import/export

Signed-off-by: saurabhraghuvanshii <saurabhsraghuvanshi@gmail.com>

lib/FlagDependencyUsagePlugin.js

@@ -19,6 +19,7 @@ const { getEntryRuntime, mergeRuntimeOwned } = require("./util/runtime");
 /** @typedef {import("./Dependency").ReferencedExports} ReferencedExports */
 /** @typedef {import("./ExportsInfo")} ExportsInfo */
 /** @typedef {import("./Module")} Module */
+/** @typedef {import("./ModuleGraph")} ModuleGraph */
 /** @typedef {import("./util/runtime").RuntimeSpec} RuntimeSpec */
 
 const { NO_EXPORTS_REFERENCED, EXPORTS_OBJECT_REFERENCED } = Dependency;
@@ -34,6 +35,48 @@ class FlagDependencyUsagePlugin {
 		this.global = global;
 	}
 
+	/**
+	 * Check if a module is doing pass-through re-exports
+	 * @param {Module} module the module to check
+	 * @param {ModuleGraph} moduleGraph the module graph
+	 * @returns {boolean} true if the module is doing pass-through re-exports
+	 */
+	_isPassThroughReexport(module, moduleGraph) {
+		if (!module.dependencies || module.dependencies.length === 0) {
+			return false;
+		}
+
+		let hasReexportDeps = false;
+		let hasOtherDeps = false;
+
+		for (const dep of module.dependencies) {
+			if (
+				dep.type === "harmony export imported specifier" ||
+				dep.type === "harmony export specifier" ||
+				dep.type === "harmony reexport" ||
+				(dep.constructor && dep.constructor.name.includes("Reexport"))
+			) {
+				hasReexportDeps = true;
+			} else if (
+				dep.type !== "harmony import" &&
+				dep.type !== "harmony import specifier"
+			) {
+				hasOtherDeps = true;
+			}
+		}
+
+		const exportsInfo = moduleGraph.getExportsInfo(module);
+		let hasOwnExports = false;
+		for (const exportInfo of exportsInfo.ownedExports) {
+			if (exportInfo.provided === true && !exportInfo.exportsInfoOwned) {
+				hasOwnExports = true;
+				break;
+			}
+		}
+
+		return hasReexportDeps && !hasOtherDeps && !hasOwnExports;
+	}
+
 	/**
 	 * Apply the plugin
 	 * @param {Compiler} compiler the compiler instance
@@ -89,7 +132,16 @@ class FlagDependencyUsagePlugin {
 									canMangle = usedExportInfo.canMangle !== false;
 								}
 								if (usedExport.length === 0) {
-									if (exportsInfo.setUsedInUnknownWay(runtime)) {
+									const isPassThroughReexport = this._isPassThroughReexport(
+										module,
+										moduleGraph
+									);
+
+									if (isPassThroughReexport) {
+										if (exportsInfo.setUsedForSideEffectsOnly(runtime)) {
+											queue.enqueue(module, runtime);
+										}
+									} else if (exportsInfo.setUsedInUnknownWay(runtime)) {
 										queue.enqueue(module, runtime);
 									}
 								} else {