First commit

src/stores/pricing.js

@@ -0,0 +1,20 @@
+const memoryBackend = require("./backend/pricing/memory.js");
+
+const globalCache = {};
+let globalInstance;
+
+function global({ seed = {}, backend = memoryBackend } = {}) {
+    if (!globalInstance) {
+        Object.assign(globalCache, seed, { USD: 1 });
+        globalInstance = backend(globalCache);
+    }
+    return globalInstance;
+}
+
+function instance({ cache = {}, backend = memoryBackend } = {}) {
+    return backend(Object.assign(cache, { USD: 1 }));
+}
+module.exports = {
+    global,
+    instance,
+};