Added enum that describes dependency kinds

src/metadata/dependency-kind.ts

@@ -0,0 +1,33 @@
+enum DependencyKind {
+    Depends = 1,
+    Recommends,
+    Includes,
+    Suggests,
+    Conflicts,
+    Breaks,
+}
+
+namespace DependencyKind {
+    export function getValues(): DependencyKind[] {
+        return <DependencyKind[]>Object.values(DependencyKind).filter(x => typeof x === "number");
+    }
+
+    export function parse(kindName: string): DependencyKind | undefined {
+        if (typeof DependencyKind[kindName] === "number") {
+            return DependencyKind[kindName];
+        }
+
+        for (const kind of Object.values(DependencyKind)) {
+            if (typeof kind === "number" && kindName.localeCompare(DependencyKind[kind], undefined, { sensitivity: "accent" }) === 0) {
+                return kind;
+            }
+        }
+        return undefined;
+    }
+
+    export function toString(target: DependencyKind): string {
+        return DependencyKind[target] ?? target.toString();
+    }
+}
+
+export default DependencyKind;