feat(stash): add stash, the new MUD client state library

.changeset/chatty-pigs-shake.md

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+---
+"@latticexyz/stash": patch
+---
+
+Adds `@latticexyz/stash`, a TypeScript client state library optimized for the MUD Store data model.
+It uses the MUD store config to define local tables, which support writing, reading and subscribing to table updates.
+It comes with a query engine optimized for "ECS-style" queries (similar to `@latticexyz/recs`) but with native support for composite keys.
+
+You can find usage examples in the [`@latticexyz/stash` README.md](https://github.com/latticexyz/mud/blob/main/packages/stash/README.md).

packages/stash/CHANGELOG.md

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+# @latticexyz/stash

packages/stash/README.md

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+# Stash
+
+Stash is a client state library optimized for the MUD data model.
+It uses the MUD store config to define local tables, which support writing, reading and subscribing to table updates.
+It comes with a query engine optimized for "ECS-style" queries (similar to `@latticexyz/recs`) but with native support for composite keys.
+
+## Getting started
+
+### Installation
+
+```bash
+pnpm add @latticexyz/stash @latticexyz/store
+```
+
+### Example usage
+
+```ts
+import { createStash } from "@latticexyz/stash";
+import { defineStore } from "@latticexyz/store";
+
+// Define the store config
+const config = defineStore(
+  tables: {
+    Position: {
+      schema: {
+        player: "address",
+        x: "int32",
+        y: "int32",
+      },
+      key: ["player"],
+    },
+  },
+);
+
+// Initialize stash
+const stash = createStash(config);
+
+// Write to a table
+const Position = config.tables;
+const alice = "0xc0F21fa55169feF83aC5f059ad2432a16F06dD44";
+stash.setRecord({
+  table: Position,
+  key: {
+    player: alice
+  },
+  value: {
+    x: 1,
+    y: 2
+  }
+});
+
+// Read from the table
+const alicePosition = stash.getRecord({ table: Position, key: { player: alice }});
+//    ^? { player: "0xc0F21fa55169feF83aC5f059ad2432a16F06dD44", x: 1, y: 2 }
+
+// Subscribe to table updates
+stash.subscribeTable({
+  table: Position,
+  subscriber: (update) => {
+    console.log("Position update", update);
+  }
+});
+
+// Query the table
+const players = stash.runQuery({
+  query: [Matches(Position, { x: 1 })],
+  options: {
+    includeRecords: true
+  }
+})
+
+// Subscribe to query updates
+const query = stash.subscribeQuery({
+  query: [Matches(Position, { x: 1 })]
+})
+query.subscribe((update) => {
+  console.log("Query update", update);
+});
+```

packages/stash/package.json

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+{
+  "name": "@latticexyz/stash",
+  "version": "2.1.0",
+  "description": "High performance client store and query engine for MUD",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/latticexyz/mud.git",
+    "directory": "packages/stash"
+  },
+  "license": "MIT",
+  "type": "module",
+  "exports": {
+    ".": "./dist/index.js",
+    "./internal": "./dist/internal.js",
+    "./recs": "./dist/recs.js"
+  },
+  "typesVersions": {
+    "*": {
+      "index": [
+        "./dist/index.d.ts"
+      ],
+      "internal": [
+        "./dist/internal.d.ts"
+      ]
+    }
+  },
+  "files": [
+    "dist"
+  ],
+  "scripts": {
+    "bench": "tsx src/bench.ts",
+    "build": "tsup",
+    "clean": "rimraf dist",
+    "dev": "tsup --watch",
+    "test": "vitest typecheck --run --passWithNoTests && vitest --run --passWithNoTests",
+    "test:ci": "pnpm run test"
+  },
+  "dependencies": {
+    "@arktype/util": "0.0.40",
+    "@latticexyz/config": "workspace:*",
+    "@latticexyz/protocol-parser": "workspace:*",
+    "@latticexyz/schema-type": "workspace:*",
+    "@latticexyz/store": "workspace:*",
+    "react": "^18.2.0",
+    "viem": "2.9.20"
+  },
+  "devDependencies": {
+    "@arktype/attest": "0.7.5",
+    "@testing-library/react": "^16.0.0",
+    "@testing-library/react-hooks": "^8.0.1",
+    "@types/react": "18.2.22",
+    "react-dom": "^18.2.0",
+    "tsup": "^6.7.0",
+    "vitest": "0.34.6"
+  },
+  "publishConfig": {
+    "access": "public"
+  }
+}

packages/stash/src/actions/decodeKey.test.ts

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+import { describe, it } from "vitest";
+import { createStash } from "../createStash";
+import { defineStore } from "@latticexyz/store/config/v2";
+import { setRecord } from "./setRecord";
+import { encodeKey } from "./encodeKey";
+import { attest } from "@ark/attest";
+import { decodeKey } from "./decodeKey";
+
+describe("decodeKey", () => {
+  it("should decode an encoded table key", () => {
+    const config = defineStore({
+      namespace: "namespace1",
+      tables: {
+        table1: {
+          schema: { field1: "string", field2: "uint32", field3: "uint256" },
+          key: ["field2", "field3"],
+        },
+      },
+    });
+    const stash = createStash(config);
+    const table = config.namespaces.namespace1.tables.table1;
+    const key = { field2: 1, field3: 2n };
+    setRecord({ stash, table, key, record: { field1: "hello" } });
+
+    const encodedKey = encodeKey({ table, key });
+    attest<typeof key>(decodeKey({ stash, table, encodedKey })).equals({ field2: 1, field3: 2n });
+  });
+});

packages/stash/src/actions/decodeKey.ts

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+import { Table } from "@latticexyz/config";
+import { Key, Stash } from "../common";
+
+export type DecodeKeyArgs<table extends Table = Table> = {
+  stash: Stash;
+  table: table;
+  encodedKey: string;
+};
+
+export type DecodeKeyResult<table extends Table = Table> = Key<table>;
+
+export function decodeKey<table extends Table>({
+  stash,
+  table,
+  encodedKey,
+}: DecodeKeyArgs<table>): DecodeKeyResult<table> {
+  const { namespaceLabel, label, key } = table;
+  const record = stash.get().records[namespaceLabel][label][encodedKey];
+
+  // Typecast needed because record values could be arrays, but we know they are not if they are key fields
+  return Object.fromEntries(Object.entries(record).filter(([field]) => key.includes(field))) as never;
+}

packages/stash/src/actions/deleteRecord.test.ts

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+import { attest } from "@ark/attest";
+import { defineStore } from "@latticexyz/store";
+import { describe, it } from "vitest";
+import { createStash } from "../createStash";
+import { setRecord } from "./setRecord";
+import { deleteRecord } from "./deleteRecord";
+
+describe("deleteRecord", () => {
+  it("should delete a record from the stash", () => {
+    const config = defineStore({
+      namespace: "namespace1",
+      tables: {
+        table1: {
+          schema: {
+            field1: "string",
+            field2: "uint32",
+            field3: "int32",
+          },
+          key: ["field2", "field3"],
+        },
+      },
+    });
+
+    const table = config.namespaces.namespace1.tables.table1;
+
+    const stash = createStash(config);
+
+    setRecord({
+      stash,
+      table,
+      key: { field2: 1, field3: 2 },
+      record: { field1: "hello" },
+    });
+
+    setRecord({
+      stash,
+      table,
+      key: { field2: 3, field3: 1 },
+      record: { field1: "world" },
+    });
+
+    deleteRecord({
+      stash,
+      table,
+      key: { field2: 1, field3: 2 },
+    });
+
+    attest(stash.get().records).snap({
+      namespace1: {
+        table1: {
+          "3|1": {
+            field1: "world",
+            field2: 3,
+            field3: 1,
+          },
+        },
+      },
+    });
+  });
+
+  it("should throw a type error if an invalid key is provided", () => {
+    const config = defineStore({
+      namespace: "namespace1",
+      tables: {
+        table1: {
+          schema: {
+            field1: "string",
+            field2: "uint32",
+            field3: "int32",
+          },
+          key: ["field2", "field3"],
+        },
+      },
+    });
+
+    const table = config.namespaces.namespace1.tables.table1;
+
+    const stash = createStash(config);
+
+    attest(() =>
+      deleteRecord({
+        stash,
+        table,
+        // @ts-expect-error Property 'field3' is missing in type '{ field2: number; }'
+        key: { field2: 1 },
+      }),
+    ).type.errors(`Property 'field3' is missing in type '{ field2: number; }'`);
+
+    attest(() =>
+      deleteRecord({
+        stash,
+        table,
+        // @ts-expect-error Type 'string' is not assignable to type 'number'
+        key: { field2: 1, field3: "invalid" },
+      }),
+    ).type.errors(`Type 'string' is not assignable to type 'number'`);
+  });
+});

packages/stash/src/actions/deleteRecord.ts

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+import { Table } from "@latticexyz/config";
+import { Key, Stash } from "../common";
+import { encodeKey } from "./encodeKey";
+import { registerTable } from "./registerTable";
+
+export type DeleteRecordArgs<table extends Table = Table> = {
+  stash: Stash;
+  table: table;
+  key: Key<table>;
+};
+
+export type DeleteRecordResult = void;
+
+export function deleteRecord<table extends Table>({ stash, table, key }: DeleteRecordArgs<table>): DeleteRecordResult {
+  const { namespaceLabel, label } = table;
+
+  if (stash.get().config[namespaceLabel] == null) {
+    registerTable({ stash, table });
+  }
+
+  const encodedKey = encodeKey({ table, key });
+  const prevRecord = stash.get().records[namespaceLabel][label][encodedKey];
+
+  // Early return if this record doesn't exist
+  if (prevRecord == null) return;
+
+  // Delete record
+  delete stash._.state.records[namespaceLabel][label][encodedKey];
+
+  // Notify table subscribers
+  const updates = { [encodedKey]: { prev: prevRecord && { ...prevRecord }, current: undefined } };
+  stash._.tableSubscribers[namespaceLabel][label].forEach((subscriber) => subscriber(updates));
+
+  // Notify stash subscribers
+  const storeUpdate = { config: {}, records: { [namespaceLabel]: { [label]: updates } } };
+  stash._.storeSubscribers.forEach((subscriber) => subscriber(storeUpdate));
+}

packages/stash/src/actions/encodeKey.test.ts

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+import { attest } from "@ark/attest";
+import { describe, it } from "vitest";
+import { encodeKey } from "./encodeKey";
+import { defineTable } from "@latticexyz/store/config/v2";
+
+describe("encodeKey", () => {
+  it("should encode a key to a string", () => {
+    const table = defineTable({
+      label: "test",
+      schema: { field1: "uint32", field2: "uint256", field3: "string" },
+      key: ["field1", "field2"],
+    });
+    attest(encodeKey({ table, key: { field1: 1, field2: 2n } })).snap("1|2");
+  });
+
+  it("should throw a type error if an invalid key is provided", () => {
+    const table = defineTable({
+      label: "test",
+      schema: { field1: "uint32", field2: "uint256", field3: "string" },
+      key: ["field1", "field2"],
+    });
+
+    attest(() =>
+      encodeKey({
+        table,
+        // @ts-expect-error Property 'field2' is missing in type '{ field1: number; }'
+        key: {
+          field1: 1,
+        },
+      }),
+    )
+      .throws(`Provided key is missing field field2.`)
+      .type.errors(`Property 'field2' is missing in type '{ field1: number; }'`);
+
+    attest(
+      encodeKey({
+        table,
+        key: {
+          field1: 1,
+          // @ts-expect-error Type 'string' is not assignable to type 'bigint'.
+          field2: "invalid",
+        },
+      }),
+    ).type.errors(`Type 'string' is not assignable to type 'bigint'.`);
+  });
+});