Completed steps up to downloading forge universal jar for 1.8-1.12.

Next step is processing the version.json and transforming it into a deliverable module.

src/util/versionutil.ts

@@ -0,0 +1,23 @@
+export class VersionUtil {
+
+    public static readonly MINECRAFT_VERSION_REGEX = /(\d+).(\d+).(\d+)/
+
+    public static isMinecraftVersion(version: string) {
+        return VersionUtil.MINECRAFT_VERSION_REGEX.test(version)
+    }
+
+    public static getMinecraftVersionComponents(version: string) {
+        if (VersionUtil.isMinecraftVersion(version)) {
+            const result = VersionUtil.MINECRAFT_VERSION_REGEX.exec(version)
+            if (result != null) {
+                return {
+                    major: Number(result[1]),
+                    minor: Number(result[2]),
+                    revision: Number(result[3])
+                }
+            }
+        }
+        return null
+    }
+
+}