Add Error Handling for YN0082 in YarnErrorHandler

npm_and_yarn/lib/dependabot/npm_and_yarn.rb

@@ -79,6 +79,8 @@ module NpmAndYarn
       FAILED_TO_RETRIEVE: %r{(?<package_req>@[\w-]+\/[\w-]+@\S+): The remote server failed to provide the requested resource} # rubocop:disable Layout/LineLength
     }.freeze, T::Hash[String, Regexp])
 
+    YN0082_PACKAGE_NOT_FOUND_REGEX = /YN0082:.*?(\S+@\S+): No candidates found/
+
     PACKAGE_NOT_FOUND2 = %r{/[^/]+: Not found}
     PACKAGE_NOT_FOUND2_PACKAGE_NAME_REGEX = %r{/(?<package_name>[^/]+): Not found}
     PACKAGE_NOT_FOUND2_PACKAGE_NAME_CAPTURE = "package_name"
@@ -241,6 +243,18 @@ def self.sanitize_resolvability_message(error_message, dependencies, yarn_lock)
         handler: lambda { |message, _error, _params|
           Dependabot::NetworkUnsafeHTTP.new(message)
         }
+      },
+      "YN0082" => {
+        message: "No candidates found",
+        handler: lambda { |message, _error, _params|
+          match_data = message.match(YN0082_PACKAGE_NOT_FOUND_REGEX)
+          if match_data
+            package_req = match_data[1]
+            Dependabot::DependencyNotFound.new("#{package_req} Detail: #{message}")
+          else
+            Dependabot::DependencyNotFound.new(message)
+          end
+        }
       }
     }.freeze, T::Hash[String, {
       message: T.any(String, NilClass),

npm_and_yarn/spec/dependabot/npm_and_yarn/yarn_error_handler_spec.rb

@@ -155,6 +155,25 @@
           )
       end
     end
+
+    context "when the error message contains YN0082" do
+      let(:error_message) do
+        "➤ YN0000: · Yarn 4.3.1\n" \
+          "➤ YN0000: ┌ Resolution step\n::group::Resolution step\n" \
+          "➤ YN0082: │ string-width-cjs@npm:^4.2.3: " \
+          "No candidates found\n::endgroup::\n" \
+          "➤ YN0082: string-width-cjs@npm:^4.2.3: " \
+          "No candidates found\n" \
+          "➤ YN0000: └ Completed\n" \
+          "➤ YN0000: · Failed with errors in 0s 158ms"
+      end
+
+      it "raises a DependencyNotFound error with the correct message" do
+        expect do
+          error_handler.handle_error(error, { yarn_lock: yarn_lock })
+        end.to raise_error(Dependabot::DependencyNotFound, /string-width-cjs@npm:\^4.2.3/)
+      end
+    end
   end
 
   describe "#find_usage_error" do
@@ -288,6 +307,25 @@
         end
       end
     end
+
+    context "when the error message contains YN0082" do
+      let(:error_message) do
+        "➤ YN0000: · Yarn 4.3.1\n" \
+          "➤ YN0000: ┌ Resolution step\n::group::Resolution step\n" \
+          "➤ YN0082: │ string-width-cjs@npm:^4.2.3: " \
+          "No candidates found\n::endgroup::\n" \
+          "➤ YN0082: string-width-cjs@npm:^4.2.3: " \
+          "No candidates found\n" \
+          "➤ YN0000: └ Completed\n" \
+          "➤ YN0000: · Failed with errors in 0s 158ms"
+      end
+
+      it "raises a DependencyNotFound error with the correct message" do
+        expect do
+          error_handler.handle_yarn_error(error, { yarn_lock: yarn_lock })
+        end.to raise_error(Dependabot::DependencyNotFound, /string-width-cjs@npm:\^4.2.3/)
+      end
+    end
   end
 
   describe "#handle_group_patterns" do