chore: refactor as suggested

Signed-off-by: Ruben Romero Montes <[email protected]>

Author: ruromero

src/providers/javascript_yarn.js

@@ -30,7 +30,7 @@ export default class Javascript_yarn extends Base_javascript {
 		const version = this._version() ?? '';
 		const matches = Javascript_yarn.VERSION_PATTERN.exec(version);
 
-		if (!matches || matches.length < 2) {
+		if (matches?.length !== 2) {
 			throw new Error(`Invalid Yarn version format: ${version}`);
 		}
 

src/providers/processors/yarn_berry_processor.js

@@ -134,7 +134,7 @@ export default class Yarn_berry_processor extends Yarn_processor {
    * @private
    */
 	#purlFromNode(depName, node) {
-		if (!node || !node.children || !node.children.Version) {
+		if (!node?.children?.Version) {
 			return undefined;
 		}
 

src/providers/processors/yarn_classic_processor.js

@@ -40,7 +40,7 @@ export default class Yarn_classic_processor extends Yarn_processor {
    * @returns {Map<string, PackageURL>} Map of dependency names to their PackageURL objects
    */
 	getRootDependencies(depTree) {
-		if (!depTree || !depTree.data || !depTree.data.trees) {
+		if (!depTree?.data?.trees) {
 			return new Map();
 		}
 
@@ -63,7 +63,7 @@ export default class Yarn_classic_processor extends Yarn_processor {
    * @param {Object} depTree - The dependency tree object
    */
 	addDependenciesToSbom(sbom, depTree) {
-		if (!depTree || !depTree.data || !depTree.data.trees) {
+		if (!depTree?.data?.trees) {
 			return;
 		}