From 7455c1e81dd18a898004c398a16e9f0b6f7c19ae Mon Sep 17 00:00:00 2001
From: Arpit Chakladar <54011232+arpitchakladar@users.noreply.github.com>
Date: Tue, 4 Apr 2023 16:05:48 +0530
Subject: Keeping track of the number of times that a shared module has been
 used and dertermining if it is to be included along with the other scripts.

---
 config/webpack/loader/count-imports-loader.js        | 18 ++++++++++++++++++
 .../plugins/create-manifest-webpack-plugin/index.js  | 20 ++++++++++++--------
 config/webpack/utils/shared-modules.js               |  4 +---
 3 files changed, 31 insertions(+), 11 deletions(-)
 create mode 100644 config/webpack/loader/count-imports-loader.js

(limited to 'config/webpack')

diff --git a/config/webpack/loader/count-imports-loader.js b/config/webpack/loader/count-imports-loader.js
new file mode 100644
index 0000000..4c3faa4
--- /dev/null
+++ b/config/webpack/loader/count-imports-loader.js
@@ -0,0 +1,18 @@
+const { ImportManager } = require("import-manager");
+
+const sharedModules = webpackRequire("utils/shared-modules.js");
+
+module.exports = function(source) {
+	const { sharedModulesImportedCount } = this.getOptions();
+	const manager = new ImportManager(source);
+
+	for (const unit of manager.imports.es6.units) {
+		const moduleIndex = sharedModules.indexOf(unit.module.name);
+
+		if (moduleIndex >= 0) {
+			sharedModulesImportedCount[sharedModules[moduleIndex]]++;
+		}
+	}
+
+	return source;
+};
diff --git a/config/webpack/plugins/create-manifest-webpack-plugin/index.js b/config/webpack/plugins/create-manifest-webpack-plugin/index.js
index a2040da..103fb3c 100644
--- a/config/webpack/plugins/create-manifest-webpack-plugin/index.js
+++ b/config/webpack/plugins/create-manifest-webpack-plugin/index.js
@@ -8,6 +8,10 @@ const sharedModules = webpackRequire("utils/shared-modules");
 const manifest = webpackRequire("plugins/create-manifest-webpack-plugin/manifest-template.json");
 
 class CreateManifestPlugin {
+	constructor({ sharedModulesImportedCount }) {
+		this.sharedModulesImportedCount = sharedModulesImportedCount;
+	}
+
 	apply(compiler) {
 		compiler.hooks.compilation.tap("CreateManifestPlugin", compilation => {
 			compilation.hooks.processAssets.tap(
@@ -20,6 +24,14 @@ class CreateManifestPlugin {
 					manifest.version = require(path.resolve(ROOT_DIR, "package.json")).version;
 					manifest.content_scripts = [];
 
+					manifest.content_scripts.push({
+						matches: [`*://banglarbhumi.gov.in/BanglarBhumi/*`],
+						js: sharedModules
+							.filter(sharedModule => this.sharedModulesImportedCount[sharedModule] > 0)
+							.map(sharedModule => `shared/${getFileNameHash(sharedModule, "shared")}.js`),
+						run_at: "document_start"
+					});
+
 					for (const scriptPath in scripts) {
 						for (const scriptType in scripts[scriptPath]) {
 							const matches = [`*://banglarbhumi.gov.in/BanglarBhumi/${scriptPath}`];
@@ -35,14 +47,6 @@ class CreateManifestPlugin {
 						}
 					}
 
-					for (const sharedModule of sharedModules) {
-						manifest.content_scripts.push({
-							matches: [`*://banglarbhumi.gov.in/BanglarBhumi/*`],
-							js: [`shared/${getFileNameHash(sharedModule, "shared")}.js`],
-							run_at: "document_start"
-						});
-					}
-
 					const resources = [];
 
 					for (const assetName in assets) {
diff --git a/config/webpack/utils/shared-modules.js b/config/webpack/utils/shared-modules.js
index 974145f..1584f0f 100644
--- a/config/webpack/utils/shared-modules.js
+++ b/config/webpack/utils/shared-modules.js
@@ -1,8 +1,6 @@
 const path = require("path");
 const fs = require("fs");
 
-const sharedModules = fs.readdirSync(path.resolve(SOURCE_DIR, "shared"))
+module.exports = fs.readdirSync(path.resolve(SOURCE_DIR, "shared"))
 	.filter(sharedModule => !sharedModule.endsWith("import-shared.js"))
 	.map(sharedModule => sharedModule.substring(0, sharedModule.length - 3));
-
-module.exports = sharedModules;
-- 
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