chore: Add in the vault

lib/util/getVault.ts

@@ -0,0 +1,44 @@
+import { Effects, EnsureStorePath } from "../types"
+
+export class GetVault<Vault> {
+  constructor(readonly effects: Effects, readonly key: keyof Vault & string) {}
+
+  /**
+   * Returns the value of Store at the provided path. Restart the service if the value changes
+   */
+  const() {
+    return this.effects.vault.get({
+      key: this.key,
+      callback: this.effects.restart,
+    })
+  }
+  /**
+   * Returns the value of Store at the provided path. Does nothing if the value changes
+   */
+  once() {
+    return this.effects.vault.get({
+      key: this.key,
+      callback: () => {},
+    })
+  }
+
+  /**
+   * Watches the value of Store at the provided path. Takes a custom callback function to run whenever the value changes
+   */
+  async *watch() {
+    while (true) {
+      let callback: () => void
+      const waitForNext = new Promise<void>((resolve) => {
+        callback = resolve
+      })
+      yield await this.effects.vault.get({
+        key: this.key,
+        callback: () => callback(),
+      })
+      await waitForNext
+    }
+  }
+}
+export function getVault<Vault>(effects: Effects, key: keyof Vault & string) {
+  return new GetVault<Vault>(effects, key)
+}