add: unit and integration testing

app/node_modules/cjs-module-lexer/lexer.d.ts

@@ -0,0 +1,8 @@
+export interface Exports {
+  exports: string[];
+  reexports: string[];
+}
+
+export declare function parse(source: string, name?: string): Exports;
+export declare function init(): Promise<void>;
+export declare function initSync(): void;