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node_modules/effect/dist/cjs/GlobalValue.js

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+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.globalValue = void 0;
+var version = _interopRequireWildcard(require("./internal/version.js"));
+function _interopRequireWildcard(e, t) { if ("function" == typeof WeakMap) var r = new WeakMap(), n = new WeakMap(); return (_interopRequireWildcard = function (e, t) { if (!t && e && e.__esModule) return e; var o, i, f = { __proto__: null, default: e }; if (null === e || "object" != typeof e && "function" != typeof e) return f; if (o = t ? n : r) { if (o.has(e)) return o.get(e); o.set(e, f); } for (const t in e) "default" !== t && {}.hasOwnProperty.call(e, t) && ((i = (o = Object.defineProperty) && Object.getOwnPropertyDescriptor(e, t)) && (i.get || i.set) ? o(f, t, i) : f[t] = e[t]); return f; })(e, t); }
+/**
+ * The `GlobalValue` module ensures that a single instance of a value is created globally,
+ * even when modules are imported multiple times (e.g., due to mixing CommonJS and ESM builds)
+ * or during hot-reloading in development environments like Next.js or Remix.
+ *
+ * It achieves this by using a versioned global store, identified by a unique `Symbol` tied to
+ * the current version of the `effect` library. The store holds values that are keyed by an identifier,
+ * allowing the reuse of previously computed instances across imports or reloads.
+ *
+ * This pattern is particularly useful in scenarios where frequent reloading can cause services or
+ * single-instance objects to be recreated unnecessarily, such as in development environments with hot-reloading.
+ *
+ * @since 2.0.0
+ */
+
+const globalStoreId = `effect/GlobalValue/globalStoreId/${/*#__PURE__*/version.getCurrentVersion()}`;
+let globalStore;
+/**
+ * Retrieves or computes a global value associated with the given `id`. If the value for this `id`
+ * has already been computed, it will be returned from the global store. If it does not exist yet,
+ * the provided `compute` function will be executed to compute the value, store it, and then return it.
+ *
+ * This ensures that even in cases where the module is imported multiple times (e.g., in mixed environments
+ * like CommonJS and ESM, or during hot-reloading in development), the value is computed only once and reused
+ * thereafter.
+ *
+ * @example
+ * ```ts
+ * import { globalValue } from "effect/GlobalValue"
+ *
+ * // This cache will persist as long as the module is running,
+ * // even if reloaded or imported elsewhere
+ * const myCache = globalValue(
+ *   Symbol.for("myCache"),
+ *   () => new WeakMap<object, number>()
+ * )
+ * ```
+ *
+ * @since 2.0.0
+ */
+const globalValue = (id, compute) => {
+  if (!globalStore) {
+    // @ts-expect-error
+    globalThis[globalStoreId] ??= new Map();
+    // @ts-expect-error
+    globalStore = globalThis[globalStoreId];
+  }
+  if (!globalStore.has(id)) {
+    globalStore.set(id, compute());
+  }
+  return globalStore.get(id);
+};
+exports.globalValue = globalValue;
+//# sourceMappingURL=GlobalValue.js.map