[FIX] Migrate from libnpmconfig to @npmcli/config

lib/ui5Framework/npm/Registry.js

@@ -49,19 +49,21 @@ class Registry {
 	}
 	async _getPacoteOptions() {
 		if (!this._npmConfig) {
-			const {default: libnpmconfig} = await import("libnpmconfig");
-			const opts = {
-				cache: this._cacheDir,
-			};
-			const config = libnpmconfig.read(opts, {
-				cwd: this._cwd
-			}).toJSON();
+			const {default: Config} = await import("@npmcli/config");
+			const {
+				default: {flatten, definitions, shorthands, defaults},
+			} = await import("@npmcli/config/lib/definitions/index.js");
 
-			// Rename https-proxy to httpsProxy so that it is picked up by npm-registry-fetch (via pacote)
-			if (config["https-proxy"]) {
-				config.httpsProxy = config["https-proxy"];
-				delete config["https-proxy"];
-			}
+			const configuration = new Config({
+				npmPath: this._cwd,
+				definitions,
+				flatten,
+				shorthands,
+				defaults
+			});
+
+			await configuration.load(); // Reads through the configurations
+			const config = configuration.flat; // JSON. Formatted via "flatten"
 
 			if (!config.proxy && !config.httpsProxy) {
 				// Disable usage of shared keep-alive agents unless a proxy is configured

package.json

@@ -129,7 +129,7 @@
 		"globby": "^13.2.0",
 		"graceful-fs": "^4.2.11",
 		"js-yaml": "^4.1.0",
-		"libnpmconfig": "^1.2.1",
+		"@npmcli/config": "^6.2.1",
 		"lockfile": "^1.0.4",
 		"make-fetch-happen": "^11.1.1",
 		"node-stream-zip": "^1.15.0",

test/lib/graph/helpers/ui5Framework.integration.js

@@ -32,20 +32,29 @@ test.beforeEach(async (t) => {
 		manifest: sinon.stub()
 	};
 
+	class Config {
+		static get typeDefs() {
+			return {};
+		}
+
+		async load() {}
+
+		get flat() {
+			return {};
+		}
+	}
+	sinon.stub(Config.prototype, "flat").value({
+		registry: "https://registry.fake",
+		cache: path.join(ui5FrameworkBaseDir, "cacache"),
+		proxy: ""
+	});
+
 	t.context.Registry = await esmock.p("../../../../lib/ui5Framework/npm/Registry.js", {
 		"@ui5/logger": ui5Logger,
 		"pacote": t.context.pacote,
-		"libnpmconfig": {
-			read: sinon.stub().returns({
-				toJSON: () => {
-					return {
-						registry: "https://registry.fake",
-						cache: path.join(ui5FrameworkBaseDir, "cacache"),
-						proxy: ""
-					};
-				}
-			})
-		},
+		"@npmcli/config": {
+			"default": Config
+		}
 	});
 
 	const AbstractInstaller = await esmock.p("../../../../lib/ui5Framework/AbstractInstaller.js", {