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node_modules/effect/dist/esm/GlobalValue.js

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+/**
+ * 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
+ */
+import * as version from "./internal/version.js";
+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
+ */
+export 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);
+};
+//# sourceMappingURL=GlobalValue.js.map