Introducing a worker to handle transformers.js without blocking.

chat5.js

@@ -0,0 +1,233 @@
+// @ts-check
+
+
+
+
+function chat5() {
+
+  function initHTML() {
+    const ui = document.createElement('div');
+    ui.innerHTML = `
+<div class=chat-log>Loading...</div>
+<div class=chat-input>[Input]</div>
+<style>
+body {
+  position: absolute;
+  left: 0; top: 0;
+  width: 100%; height: 100%;
+  margin: 0;
+  padding: 0;
+  border: none;
+  display: grid;
+  grid-template: 1fr auto / 1fr;
+}
+
+.chat-log {
+  display: grid;
+  grid-template: 1fr / 1fr;
+}
+.chat-input {
+  border-top: solid 1px black;
+  display: grid;
+  grid-template: 1fr auto / 1fr;
+}
+.prose-mirror {
+  overflow-y: auto;
+}
+
+.milkdown {
+  display: grid;
+  grid-template: 1fr / 1fr;
+}
+
+.milkdown .ProseMirror {
+  min-height: 2em;
+  padding: 0.6em;
+  font-family: inherit;
+  white-space: pre-wrap;
+}
+
+</style>
+`;
+
+    if (!document.body) {
+      document.documentElement.appendChild(document.createElement('body'));
+    } else {
+      cleanBody();
+    }
+
+    for (const elem of [...ui.children]) {
+      document.body.appendChild(elem);
+    }
+
+    const chatLog = /** @type {HTMLElement|null} */ (document.querySelector('.chat-log'));
+    const chatInput = /** @type {HTMLElement|null} */ (document.querySelector('.chat-input'));
+
+    return { chatLog, chatInput };
+  }
+
+  function cleanBody() {
+    for (const elem of [...document.body.childNodes]) {
+      if ((/** @type {HTMLElement} */ (elem).tagName || '').toLowerCase() === 'script') continue;
+      elem.remove();
+    }
+  }
+
+  async function initMilkdown({ chatLog, chatInput }) {
+    if (chatLog) chatLog.textContent = 'Loading Milkdown...';
+
+    try {
+      // Import all necessary Milkdown modules with the same version
+      const version = '7.15.3';
+      const [
+        kitCore,
+        kitCommonmark,
+        milkdownCore,
+        milkdownPresetCommonmark,
+        milkdownProse,
+        prosemirrorKeymap,
+        prosemirrorState
+      ] = await Promise.all([
+        import(`https://esm.sh/@milkdown/kit@${version}/core`),
+        import(`https://esm.sh/@milkdown/kit@${version}/preset/commonmark`),
+        import(`https://esm.sh/@milkdown/core@${version}`),
+        import(`https://esm.sh/@milkdown/preset-commonmark@${version}`),
+        import(`https://esm.sh/@milkdown/prose@${version}`),
+        import('https://esm.sh/[email protected]'),
+        import('https://esm.sh/[email protected]')
+      ]);
+
+      if (chatLog) chatLog.innerHTML = '';
+      if (chatInput) chatInput.innerHTML = '';
+
+      // Use context keys from milkdownCore only
+      const { rootCtx, defaultValueCtx, editorViewOptionsCtx } = milkdownCore;
+
+      // Create read-only editor in .chat-log
+      const chatLogEditor = await milkdownCore.Editor.make()
+        .config((ctx) => {
+          ctx.set(rootCtx, chatLog);
+          ctx.set(defaultValueCtx, 'Loaded.');
+          ctx.set(editorViewOptionsCtx, { editable: () => false });
+        })
+        .use(kitCommonmark.commonmark)
+        .create();
+
+      // Create editable editor in .chat-input, no placeholder, starts empty
+      const chatInputEditor = await milkdownCore.Editor.make()
+        .config((ctx) => {
+          ctx.set(rootCtx, chatInput);
+          ctx.set(defaultValueCtx, '');
+        })
+        .use(kitCommonmark.commonmark)
+        .create();
+
+      return {
+        kitCore,
+        kitCommonmark,
+        milkdownCore,
+        milkdownPresetCommonmark,
+        milkdownProse,
+        prosemirrorKeymap,
+        prosemirrorState,
+        chatLogEditor,
+        chatInputEditor
+      };
+    } catch (error) {
+      console.log(error);
+      const errorElem = document.createElement('pre');
+      errorElem.innerText = error.stack || 'ERR ' + error.message;
+      errorElem.style.whiteSpace = 'pre-wrap';
+      (chatLog || document.body).appendChild(errorElem);
+    }
+  }
+
+  async function outputMessage(chatLogEditor, milkdownCore, msg) {
+    await chatLogEditor.action((ctx) => {
+      const view = ctx.get(milkdownCore.editorViewCtx);
+      const parser = ctx.get(milkdownCore.parserCtx);
+      const serializer = ctx.get(milkdownCore.serializerCtx);
+      const state = view.state;
+      // Get current markdown, append new message, and parse
+      const currentMarkdown = serializer(state.doc);
+      const newMarkdown = currentMarkdown ? (currentMarkdown + '\n' + msg) : msg;
+      const doc = parser(newMarkdown);
+      // Use replaceWith and doc.content to avoid TransformError
+      const tr = state.tr.replaceWith(0, state.doc.content.size, doc.content);
+      view.dispatch(tr);
+    });
+    // Scroll chat log to bottom (smooth if possible)
+    const chatLogElem = document.querySelector('.chat-log');
+    if (chatLogElem) {
+      if ('scrollTo' in chatLogElem) {
+        chatLogElem.scrollTo({ top: chatLogElem.scrollHeight, behavior: 'smooth' });
+      } else {
+        chatLogElem.scrollTop = chatLogElem.scrollHeight;
+      }
+    }
+  }
+
+  async function runBrowser() {
+    window.onerror = (...args) => {
+      alert(args.map(String).join('\n'));
+    };
+    const { kitCore, kitCommonmark, chatLog, chatInput } = initHTML();
+    const milkdownResult = await initMilkdown({ chatLog, chatInput });
+    if (!milkdownResult) return;
+  const { chatLogEditor, chatInputEditor, milkdownCore, prosemirrorKeymap, prosemirrorState } = milkdownResult;
+
+    outputMessage(chatLogEditor, milkdownCore, 'Milkdown editor component is loaded correctly. Please try typing...');
+
+    // Add a ProseMirror plugin to handle Enter key in chat input editor
+    await chatInputEditor.action((ctx) => {
+      const serializer = ctx.get(milkdownCore.serializerCtx);
+      const view = ctx.get(milkdownCore.editorViewCtx);
+      const { Plugin } = prosemirrorState;
+      // Add a keymap plugin for Enter
+      const enterPlugin = new Plugin({
+        props: {
+          handleKeyDown(view, event) {
+            if (
+              event.key === 'Enter' &&
+              !event.ctrlKey && !event.altKey && !event.shiftKey && !event.metaKey
+            ) {
+              event.preventDefault();
+              const inputMarkdown = serializer(view.state.doc).trim();
+              if (inputMarkdown) {
+                const msg = `user typed:\n> ${inputMarkdown.replace(/\n/g, '\n> ')}`;
+                outputMessage(chatLogEditor, milkdownCore, msg);
+                // Clear input
+                const tr = view.state.tr.replaceWith(
+                  0,
+                  view.state.doc.content.size,
+                  view.state.schema.nodes.doc.createAndFill().content
+                );
+                view.dispatch(tr);
+              }
+              return true;
+            }
+            return false;
+          },
+        },
+      });
+      view.state = view.state.reconfigure({
+        plugins: [...view.state.plugins, enterPlugin],
+      });
+      view.updateState(view.state);
+    });
+
+    window.onerror = (...args) => {
+      try {
+        outputMessage(chatLogEditor, milkdownCore, args.map(String).join('\n'));
+      } catch (errorNext) {
+        alert(args.map(String).join('\n') + '\n\n' + errorNext.stack);
+      }
+    };
+  }
+
+  if (typeof window !== 'undefined' && typeof window?.alert === 'function'
+    && typeof document !== 'undefined' && typeof document?.createElement === 'function') {
+    runBrowser();
+  }
+}
+chat5();

package-lock.json

@@ -1,14 +1,15 @@
 {
   "name": "localm",
-  "version": "1.0.1",
+  "version": "1.0.6",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "localm",
-      "version": "1.0.1",
+      "version": "1.0.6",
       "license": "ISC",
       "dependencies": {
+        "@huggingface/transformers": "^3.7.2",
         "@milkdown/crepe": "^7.15.3",
         "esbuild": "^0.25.9"
       }
@@ -455,6 +456,16 @@
         "w3c-keyname": "^2.2.4"
       }
     },
+    "node_modules/@emnapi/runtime": {
+      "version": "1.4.5",
+      "resolved": "https://registry.npmjs.org/@emnapi/runtime/-/runtime-1.4.5.tgz",
+      "integrity": "sha512-++LApOtY0pEEz1zrd9vy1/zXVaVJJ/EbAF3u0fXIzPJEDtnITsBGbbK0EkM72amhl/R5b+5xx0Y/QhcVOpuulg==",
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "tslib": "^2.4.0"
+      }
+    },
     "node_modules/@esbuild/aix-ppc64": {
       "version": "0.25.9",
       "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.25.9.tgz",
@@ -890,11 +901,462 @@
         "@floating-ui/utils": "^0.2.10"
       }
     },
-    "node_modules/@floating-ui/utils": {
-      "version": "0.2.10",
-      "resolved": "https://registry.npmjs.org/@floating-ui/utils/-/utils-0.2.10.tgz",
-      "integrity": "sha512-aGTxbpbg8/b5JfU1HXSrbH3wXZuLPJcNEcZQFMxLs3oSzgtVu6nFPkbbGGUvBcUjKV2YyB9Wxxabo+HEH9tcRQ==",
-      "license": "MIT"
+    "node_modules/@floating-ui/utils": {
+      "version": "0.2.10",
+      "resolved": "https://registry.npmjs.org/@floating-ui/utils/-/utils-0.2.10.tgz",
+      "integrity": "sha512-aGTxbpbg8/b5JfU1HXSrbH3wXZuLPJcNEcZQFMxLs3oSzgtVu6nFPkbbGGUvBcUjKV2YyB9Wxxabo+HEH9tcRQ==",
+      "license": "MIT"
+    },
+    "node_modules/@huggingface/jinja": {
+      "version": "0.5.1",
+      "resolved": "https://registry.npmjs.org/@huggingface/jinja/-/jinja-0.5.1.tgz",
+      "integrity": "sha512-yUZLld4lrM9iFxHCwFQ7D1HW2MWMwSbeB7WzWqFYDWK+rEb+WldkLdAJxUPOmgICMHZLzZGVcVjFh3w/YGubng==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@huggingface/transformers": {
+      "version": "3.7.2",
+      "resolved": "https://registry.npmjs.org/@huggingface/transformers/-/transformers-3.7.2.tgz",
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+      "license": "Apache-2.0",
+      "dependencies": {
+        "@huggingface/jinja": "^0.5.1",
+        "onnxruntime-node": "1.21.0",
+        "onnxruntime-web": "1.22.0-dev.20250409-89f8206ba4",
+        "sharp": "^0.34.1"
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+      "license": "ISC",
+      "dependencies": {
+        "@isaacs/fs-minipass": "^4.0.0",
+        "chownr": "^3.0.0",
+        "minipass": "^7.1.2",
+        "minizlib": "^3.0.1",
+        "mkdirp": "^3.0.1",
+        "yallist": "^5.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/trough": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/trough/-/trough-2.2.0.tgz",
@@ -3079,6 +4097,24 @@
       "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
       "license": "0BSD"
     },
+    "node_modules/type-fest": {
+      "version": "0.13.1",
+      "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.13.1.tgz",
+      "integrity": "sha512-34R7HTnG0XIJcBSn5XhDd7nNFPRcXYRZrBB2O2jdKqYODldSzBAqzsWoZYYvduky73toYS/ESqxPvkDf/F0XMg==",
+      "license": "(MIT OR CC0-1.0)",
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/undici-types": {
+      "version": "7.10.0",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.10.0.tgz",
+      "integrity": "sha512-t5Fy/nfn+14LuOc2KNYg75vZqClpAiqscVvMygNnlsHBFpSXdJaYtXMcdNLpl/Qvc3P2cB3s6lOV51nqsFq4ag==",
+      "license": "MIT"
+    },
     "node_modules/unified": {
       "version": "11.0.5",
       "resolved": "https://registry.npmjs.org/unified/-/unified-11.0.5.tgz",
@@ -3222,6 +4258,15 @@
       "integrity": "sha512-dpojBhNsCNN7T82Tm7k26A6G9ML3NkhDsnw9n/eoxSRlVBB4CEtIQ/KTCLI2Fwf3ataSXRhYFkQi3SlnFwPvPQ==",
       "license": "MIT"
     },
+    "node_modules/yallist": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-5.0.0.tgz",
+      "integrity": "sha512-YgvUTfwqyc7UXVMrB+SImsVYSmTS8X/tSrtdNZMImM+n7+QTriRXyXim0mBrTXNeqzVF0KWGgHPeiyViFFrNDw==",
+      "license": "BlueOak-1.0.0",
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/zwitch": {
       "version": "2.0.4",
       "resolved": "https://registry.npmjs.org/zwitch/-/zwitch-2.0.4.tgz",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "localm",
-  "version": "1.0.5",
+  "version": "1.0.6",
   "description": "",
   "main": "chat-full.js",
   "scripts": {
@@ -21,6 +21,7 @@
   },
   "homepage": "https://github.com/oyin-bo/localm#readme",
   "dependencies": {
+    "@huggingface/transformers": "^3.7.2",
     "@milkdown/crepe": "^7.15.3",
     "esbuild": "^0.25.9"
   }

src/app/boot-app.js

@@ -1,11 +1,10 @@
 // @ts-check
 
-import { editorViewCtx, parserCtx, serializerCtx, commandsCtx } from '@milkdown/core';
-import { $command, $useKeymap } from '@milkdown/utils';
+import { makeEnterPlugins } from './enter-key';
 import { initHTML } from './init-html';
 import { initMilkdown } from './init-milkdown';
 import { outputMessage } from './output-message';
-import { makeEnterPlugins } from './enter-key';
+import { workerConnection } from './worker-connection';
 
 /** @type {import('@milkdown/core').Editor} */
 export var chatLogEditor;
@@ -13,9 +12,11 @@ export var chatLogEditor;
 /** @type {import('@milkdown/core').Editor} */
 export var chatInputEditor;
 
+export var worker;
 
 export async function bootApp() {
   const { chatLog, chatInput } = initHTML();
+  worker = workerConnection();
   const { chatLogEditor: chatLogEditorInstance, chatInputEditor: chatInputEditorInstance } = await initMilkdown({
     chatLog,
     chatInput,

src/app/enter-key.js

@@ -8,7 +8,6 @@ import {
 } from '@milkdown/core';
 import { $command, $useKeymap } from '@milkdown/utils';
 
-import { outputMessage } from './output-message';
 import { handlePrompt } from './handle-prompt';
 
 export function makeEnterPlugins() {

src/app/worker-connection.js

@@ -0,0 +1,89 @@
+// @ts-check
+
+export function workerConnection() {
+  // TODO: load worker and expose an API for the rest of app to use
+
+  const workerLoaded = loadWorker();
+
+  const connection = {
+    listModels,
+    loadModel,
+    runPrompt
+  };
+
+  return connection;
+
+  function loadWorker() {
+    // Create a worker from the same URL as the currently executing script.
+    // We locate the current script URL via document.currentScript when in the window context.
+    // Build a blob that imports this script and calls bootWorker when executed inside a worker.
+    return new Promise((resolve, reject) => {
+      try {
+        const scriptUrl = (typeof document !== 'undefined' && (document.currentScript && document.currentScript.src)) ||
+          (typeof document !== 'undefined' && document.scripts && document.scripts[document.scripts.length - 1] && document.scripts[document.scripts.length - 1].src) ||
+          (typeof window !== 'undefined' && window.location && window.location.href) || '';
+
+        const worker = new Worker(scriptUrl, { type: 'module' });
+
+        const pending = new Map();
+        let ready = false;
+
+        worker.addEventListener('message', (ev) => {
+          const msg = ev.data || {};
+          if (msg && msg.type === 'ready') {
+            ready = true;
+            resolve({ worker: worker, pending, send });
+            return;
+          }
+
+          if (msg && msg.id) {
+            const id = msg.id;
+            const entry = pending.get(id);
+            if (!entry) return;
+            pending.delete(id);
+            if (msg.type === 'response') entry.resolve(msg.result);
+            else if (msg.type === 'error') entry.reject(new Error(msg.error));
+            else entry.resolve(msg);
+          }
+        });
+
+        worker.addEventListener('error', (err) => {
+          if (!ready) reject(err);
+        });
+
+        function send(message) {
+          return new Promise((res, rej) => {
+            const id = String(Math.random()).slice(2);
+            pending.set(id, { resolve: res, reject: rej });
+            worker.postMessage(Object.assign({}, message, { id }));
+          });
+        }
+      } catch (err) {
+        reject(err);
+      }
+    });
+  }
+
+  async function listModels() {
+    await workerLoaded;
+  const { send } = await workerLoaded;
+  return send({ type: 'listModels' });
+  }
+
+  /** @param {string} modelName */
+  async function loadModel(modelName) {
+    await workerLoaded;
+  const { send } = await workerLoaded;
+  return send({ type: 'loadModel', model: modelName });
+  }
+
+  /**
+   * @param {string} promptText
+   * @param {string} modelName
+   */
+  async function runPrompt(promptText, modelName) {
+    await workerLoaded;
+  const { send } = await workerLoaded;
+  return send({ type: 'runPrompt', prompt: promptText, model: modelName });
+  }
+}

src/index.js

@@ -1,8 +1,13 @@
 // @ts-check
-
-import { bootApp } from './app/boot-app';
+/// <reference lib="webworker" />
 
 if (typeof window !== 'undefined' && typeof window?.alert === 'function'
   && typeof document !== 'undefined' && typeof document?.createElement === 'function') {
-  bootApp();
+  import('./app/boot-app.js').then(({ bootApp }) => {
+    bootApp();
+  });
+} else if (typeof WorkerGlobalScope === 'function' && self instanceof WorkerGlobalScope) {
+  import('./worker/boot-worker.js').then(({ bootWorker }) => {
+    bootWorker();
+  });
 }

src/worker/boot-worker.js

@@ -0,0 +1,58 @@
+// @ts-check
+
+// Use a normal static import from the official package. This keeps import semantics
+// predictable and lets your bundler (esbuild) resolve the package during build.
+import * as hf from '@huggingface/transformers';
+
+export function bootWorker() {
+  // Report starting
+  try {
+    self.postMessage({ type: 'status', status: 'initializing' });
+  } catch (e) {
+    // ignore if postMessage not available for some reason
+  }
+
+  (async () => {
+    // Use the imported @huggingface/transformers module
+    let transformersLib = hf;
+    try {
+      if (!transformersLib) throw new Error('transformers module not available');
+      self.postMessage({ type: 'status', status: 'transformers-loaded', source: '@huggingface/transformers' });
+    } catch (err) {
+      self.postMessage({ type: 'status', status: 'transformers-load-failed', error: String(err) });
+    }
+
+    // Minimal in-worker state for later model operations
+    const availableModels = ['dummy-model'];
+    let currentModel = null;
+
+    // signal ready to main thread
+    self.postMessage({ type: 'ready' });
+
+    // handle incoming requests from the UI thread
+    self.addEventListener('message', async (ev) => {
+      const msg = ev.data || {};
+      const id = msg.id;
+      try {
+        if (msg.type === 'listModels') {
+          self.postMessage({ id, type: 'response', result: availableModels });
+        } else if (msg.type === 'loadModel') {
+          const modelName = msg.model;
+          // TODO: replace with real model loading code using transformersLib
+          await new Promise((r) => setTimeout(r, 150));
+          currentModel = modelName;
+          self.postMessage({ id, type: 'response', result: { model: modelName, status: 'loaded' } });
+        } else if (msg.type === 'runPrompt') {
+          const prompt = msg.prompt || '';
+          // TODO: run the prompt with transformersLib pipeline once integrated
+          const text = `Worker(${currentModel || 'no-model'}): ${prompt}`;
+          self.postMessage({ id, type: 'response', result: text });
+        } else {
+          if (id) self.postMessage({ id, type: 'error', error: 'unknown-message-type' });
+        }
+      } catch (err) {
+        if (id) self.postMessage({ id, type: 'error', error: String(err) });
+      }
+    });
+  })();
+}