Fix illformed requirement error on "workspace:" dependencies (#8099)

Co-authored-by: Landon Grindheim <landon.grindheim@gmail.com>

npm_and_yarn/lib/dependabot/npm_and_yarn/file_parser.rb

@@ -83,6 +83,9 @@ def manifest_dependencies
           self.class.each_dependency(json) do |name, requirement, type|
             next unless requirement.is_a?(String)
 
+            # Skip dependencies using Yarn workspace cross-references as requirements
+            next if requirement.start_with?("workspace:")
+
             requirement = "*" if requirement == ""
             dep = build_dependency(
               file: file, type: type, name: name, requirement: requirement

npm_and_yarn/spec/dependabot/npm_and_yarn/file_parser_spec.rb

@@ -59,6 +59,12 @@
         its(:length) { is_expected.to eq(0) }
       end
 
+      context "with yarn `workspace:` requirements and no lockfile" do
+        let(:files) { project_dependency_files("yarn/workspace_requirements_no_lockfile") }
+
+        its(:length) { is_expected.to eq(0) }
+      end
+
       context "with a package-lock.json" do
         let(:files) { project_dependency_files("npm6/simple") }
 

npm_and_yarn/spec/fixtures/projects/yarn/workspace_requirements_no_lockfile/package.json

@@ -0,0 +1,22 @@
+{
+  "name": "file_version_requirements_no_lockfile",
+  "version": "0.0.1",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/gocardless/bump-test.git"
+  },
+  "author": "",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/gocardless/bump-test/issues"
+  },
+  "homepage": "https://github.com/gocardless/bump-test#readme",
+  "dependencies": {
+    "ember-simple-charts": "workspace:*"
+  }
+}