feat(core): add module scaffolding and provider registries

src/token-mergers/index.ts

@@ -0,0 +1,42 @@
+import { mergeTokens as defaultMergeTokens } from "../token-merger";
+import { MergedToken, Token } from "../types";
+
+export interface TokenMergerProvider {
+  id: string;
+  merge: (tokens: Token[]) => MergedToken[];
+}
+
+type TokenMergerProviderFactory = () => TokenMergerProvider;
+
+const tokenMergerProviderFactories = new Map<string, TokenMergerProviderFactory>();
+
+export function registerTokenMergerProvider(
+  id: string,
+  factory: TokenMergerProviderFactory,
+): void {
+  if (tokenMergerProviderFactories.has(id)) {
+    return;
+  }
+  tokenMergerProviderFactories.set(id, factory);
+}
+
+export function getRegisteredTokenMergerProviderIds(): string[] {
+  return Array.from(tokenMergerProviderFactories.keys());
+}
+
+export function createTokenMergerProvider(
+  id = "default",
+): TokenMergerProvider | null {
+  const factory = tokenMergerProviderFactories.get(id);
+  if (!factory) return null;
+  return factory();
+}
+
+function registerDefaultTokenMergerProviders(): void {
+  registerTokenMergerProvider("default", () => ({
+    id: "default",
+    merge: (tokens: Token[]) => defaultMergeTokens(tokens),
+  }));
+}
+
+registerDefaultTokenMergerProviders();