Fix using loro in cloudflare worker (#441)

* fix: try fix generated wasm bundler

* fix: loro-quill example

 and fix bundler patch issue

* chore: add release info

.changeset/six-oranges-hang.md

@@ -0,0 +1,6 @@
+---
+"loro-wasm": patch
+"loro-crdt": patch
+---
+
+Make loro-wasm work in cloudflare worker

crates/loro-wasm/scripts/build.ts

@@ -41,8 +41,7 @@ async function build() {
         // const snip = `wasm-snip ./${target}/loro_wasm_bg.wasm -o ./${target}/loro_wasm_bg.wasm`;
         // console.log(">", snip);
         // await Deno.run({ cmd: snip.split(" "), cwd: LoroWasmDir }).status();
-        const cmd =
-          `wasm-opt -Os ./${target}/loro_wasm_bg.wasm -o ./${target}/loro_wasm_bg.wasm`;
+        const cmd = `wasm-opt -Os ./${target}/loro_wasm_bg.wasm -o ./${target}/loro_wasm_bg.wasm`;
         console.log(">", cmd);
         await Deno.run({ cmd: cmd.split(" "), cwd: LoroWasmDir }).status();
       }),
@@ -58,8 +57,7 @@ async function build() {
 }
 
 async function cargoBuild() {
-  const cmd =
-    `cargo build --target wasm32-unknown-unknown --profile ${profile}`;
+  const cmd = `cargo build --target wasm32-unknown-unknown --profile ${profile}`;
   console.log(cmd);
   const status = await Deno.run({
     cmd: cmd.split(" "),
@@ -87,8 +85,7 @@ async function buildTarget(target: string) {
   }
 
   // TODO: polyfill FinalizationRegistry
-  const cmd =
-    `wasm-bindgen --weak-refs --target ${target} --out-dir ${target} ../../target/wasm32-unknown-unknown/${profileDir}/loro_wasm.wasm`;
+  const cmd = `wasm-bindgen --weak-refs --target ${target} --out-dir ${target} ../../target/wasm32-unknown-unknown/${profileDir}/loro_wasm.wasm`;
   console.log(">", cmd);
   await Deno.run({ cmd: cmd.split(" "), cwd: LoroWasmDir }).status();
   console.log();
@@ -106,6 +103,16 @@ async function buildTarget(target: string) {
       wasm + "\n" + patch,
     );
   }
+  if (target === "bundler") {
+    console.log("🔨  Patching bundler target");
+    const patch = await Deno.readTextFile(
+      path.resolve(__dirname, "./bundler_patch.js"),
+    );
+    await Deno.writeTextFile(
+      path.resolve(targetDirPath, "loro_wasm.js"),
+      patch,
+    );
+  }
 }
 
 build();

crates/loro-wasm/scripts/bundler_patch.js

@@ -0,0 +1,16 @@
+// See https://github.com/loro-dev/loro/issues/440
+// Without this patch, Cloudflare Worker would raise issue like: "Uncaught TypeError: wasm2.__wbindgen_start is not a function"
+import * as wasm from "./loro_wasm_bg.wasm";
+import * as imports from "./loro_wasm_bg.js";
+
+if (wasm.__wbindgen_start) {
+    imports.__wbg_set_wasm(wasm);
+    wasm.__wbindgen_start();
+} else {
+    const wkmod = await import("./loro_wasm_bg.wasm");
+    const instance = new WebAssembly.Instance(wkmod.default, {
+        "./loro_wasm_bg.js": imports,
+    });
+    imports.__wbg_set_wasm(instance.exports);
+}
+export * from "./loro_wasm_bg.js";

examples/loro-quill/src/App.vue

@@ -57,7 +57,7 @@
       };
 
       text.subscribe((e) => {
-        if (e.local) {
+        if (e.by === "local") {
           Promise.resolve().then(sync);
         }
         Promise.resolve().then(() => {

examples/loro-quill/src/binding.ts

@@ -2,7 +2,7 @@
  *  The skeleton of this binding is learned from https://github.com/yjs/y-quill
  */
 
-import { Delta, Loro, LoroText, setDebug } from "loro-crdt";
+import { Delta, Loro, LoroText } from "loro-crdt";
 import Quill, { DeltaOperation, DeltaStatic, Sources } from "quill";
 // @ts-ignore
 import isEqual from "is-equal";
@@ -35,11 +35,14 @@ export class QuillBinding {
     });
     this.quill = quill;
     this.richtext = doc.getText("text");
-    this.richtext.subscribe(doc, (event) => {
-      Promise.resolve().then(() => {
-        if (!event.local && event.diff.type == "text") {
-          console.log(doc.peerId, "CRDT_EVENT", event);
-          const eventDelta = event.diff.diff;
+    this.richtext.subscribe((event) => {
+      if (event.by !== "import") {
+        return;
+      }
+
+      for (const e of event.events) {
+        if (e.diff.type == "text") {
+          const eventDelta = e.diff.diff;
           const delta: Delta<string>[] = [];
           let index = 0;
           for (let i = 0; i < eventDelta.length; i++) {
@@ -74,7 +77,7 @@ export class QuillBinding {
             quill.setContents(new Delta(a), "this" as any);
           }
         }
-      });
+      }
     });
     quill.setContents(
       new Delta(