@assistant-ui/react/dist/utils/smooth/useSmooth.js

Typescript/React library for AI Chat

"use strict";
"use client";
var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __export = (target, all) => {
  for (var name in all)
    __defProp(target, name, { get: all[name], enumerable: true });
};
var __copyProps = (to, from, except, desc) => {
  if (from && typeof from === "object" || typeof from === "function") {
    for (let key of __getOwnPropNames(from))
      if (!__hasOwnProp.call(to, key) && key !== except)
        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
  }
  return to;
};
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);

// src/utils/smooth/useSmooth.tsx
var useSmooth_exports = {};
__export(useSmooth_exports, {
  useSmooth: () => useSmooth
});
module.exports = __toCommonJS(useSmooth_exports);
var import_react = require("react");
var import_context = require("../../context/index.js");
var import_react_use_callback_ref = require("@radix-ui/react-use-callback-ref");
var import_SmoothContext = require("./SmoothContext.js");
var import_ReadonlyStore = require("../../context/ReadonlyStore.js");
var TextStreamAnimator = class {
  constructor(currentText, setText) {
    this.currentText = currentText;
    this.setText = setText;
  }
  animationFrameId = null;
  lastUpdateTime = Date.now();
  targetText = "";
  start() {
    if (this.animationFrameId !== null) return;
    this.lastUpdateTime = Date.now();
    this.animate();
  }
  stop() {
    if (this.animationFrameId !== null) {
      cancelAnimationFrame(this.animationFrameId);
      this.animationFrameId = null;
    }
  }
  animate = () => {
    const currentTime = Date.now();
    const deltaTime = currentTime - this.lastUpdateTime;
    let timeToConsume = deltaTime;
    const remainingChars = this.targetText.length - this.currentText.length;
    const baseTimePerChar = Math.min(5, 250 / remainingChars);
    let charsToAdd = 0;
    while (timeToConsume >= baseTimePerChar && charsToAdd < remainingChars) {
      charsToAdd++;
      timeToConsume -= baseTimePerChar;
    }
    if (charsToAdd !== remainingChars) {
      this.animationFrameId = requestAnimationFrame(this.animate);
    } else {
      this.animationFrameId = null;
    }
    if (charsToAdd === 0) return;
    this.currentText = this.targetText.slice(
      0,
      this.currentText.length + charsToAdd
    );
    this.lastUpdateTime = currentTime - timeToConsume;
    this.setText(this.currentText);
  };
};
var SMOOTH_STATUS = Object.freeze({
  type: "running"
});
var useSmooth = (state, smooth = false) => {
  const { text } = state;
  const id = (0, import_context.useMessage)({
    optional: true,
    selector: (m) => m.id
  });
  const idRef = (0, import_react.useRef)(id);
  const [displayedText, setDisplayedText] = (0, import_react.useState)(text);
  const smoothStatusStore = (0, import_SmoothContext.useSmoothStatusStore)({ optional: true });
  const setText = (0, import_react_use_callback_ref.useCallbackRef)((text2) => {
    setDisplayedText(text2);
    if (smoothStatusStore) {
      const target = displayedText !== text2 || state.status.type === "running" ? SMOOTH_STATUS : state.status;
      (0, import_ReadonlyStore.writableStore)(smoothStatusStore).setState(target, true);
    }
  });
  (0, import_react.useEffect)(() => {
    if (smoothStatusStore) {
      const target = displayedText !== text || state.status.type === "running" ? SMOOTH_STATUS : state.status;
      (0, import_ReadonlyStore.writableStore)(smoothStatusStore).setState(target, true);
    }
  }, [smoothStatusStore, text, displayedText, state.status]);
  const [animatorRef] = (0, import_react.useState)(
    new TextStreamAnimator(text, setText)
  );
  (0, import_react.useEffect)(() => {
    if (!smooth) {
      animatorRef.stop();
      return;
    }
    if (idRef.current !== id || !text.startsWith(animatorRef.targetText)) {
      idRef.current = id;
      setText(text);
      animatorRef.currentText = text;
      animatorRef.targetText = text;
      animatorRef.stop();
      return;
    }
    animatorRef.targetText = text;
    animatorRef.start();
  }, [setText, animatorRef, id, smooth, text]);
  (0, import_react.useEffect)(() => {
    return () => {
      animatorRef.stop();
    };
  }, [animatorRef]);
  return (0, import_react.useMemo)(
    () => smooth ? {
      type: "text",
      text: displayedText,
      status: text === displayedText ? state.status : SMOOTH_STATUS
    } : state,
    [smooth, displayedText, state, text]
  );
};
// Annotate the CommonJS export names for ESM import in node:
0 && (module.exports = {
  useSmooth
});
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