flex-theme/dist/theme.mjs

A flexible theming system for web applications

// src/theme.ts
var currentTheme = "system";
var listeners = [];
function safeMatchMedia(query) {
  if (typeof window === "undefined") return false;
  if (typeof window.matchMedia !== "function") return false;
  return window.matchMedia(query).matches;
}
function initTheme() {
  if (typeof window === "undefined") return;
  const savedTheme = localStorage.getItem("theme");
  if (savedTheme && ["light", "dark", "system"].includes(savedTheme)) {
    currentTheme = savedTheme;
  } else {
    currentTheme = "system";
  }
  applyTheme();
}
function applyTheme() {
  if (typeof window === "undefined" || !document) return;
  let effectiveTheme = currentTheme;
  if (effectiveTheme === "system") {
    effectiveTheme = safeMatchMedia("(prefers-color-scheme: dark)") ? "dark" : "light";
  }
  if (effectiveTheme === "dark") {
    document.documentElement.classList.add("dark");
    document.documentElement.classList.remove("light");
  } else {
    document.documentElement.classList.add("light");
    document.documentElement.classList.remove("dark");
  }
  if (typeof localStorage !== "undefined") {
    localStorage.setItem("theme", currentTheme);
  }
}
function getTheme() {
  return currentTheme;
}
function getResolvedTheme() {
  if (currentTheme === "system") {
    return safeMatchMedia("(prefers-color-scheme: dark)") ? "dark" : "light";
  }
  return currentTheme;
}
function setTheme(theme) {
  if (!["light", "dark", "system"].includes(theme)) {
    console.error(`Invalid theme: ${theme}. Must be 'light', 'dark', or 'system'`);
    return;
  }
  currentTheme = theme;
  applyTheme();
  listeners.forEach((listener) => listener(theme));
}
function toggleTheme() {
  const newTheme = currentTheme === "light" ? "dark" : "light";
  setTheme(newTheme);
}
function onThemeChange(listener) {
  listeners.push(listener);
}
function offThemeChange(listener) {
  const index = listeners.indexOf(listener);
  if (index !== -1) {
    listeners.splice(index, 1);
  }
}
if (typeof window !== "undefined") {
  initTheme();
  if (typeof window.matchMedia === "function") {
    try {
      const mediaQuery = window.matchMedia("(prefers-color-scheme: dark)");
      if (mediaQuery.addEventListener) {
        mediaQuery.addEventListener("change", () => {
          if (currentTheme === "system") {
            applyTheme();
            listeners.forEach((listener) => listener(currentTheme));
          }
        });
      } else if (mediaQuery.addListener) {
        mediaQuery.addListener(() => {
          if (currentTheme === "system") {
            applyTheme();
            listeners.forEach((listener) => listener(currentTheme));
          }
        });
      }
    } catch (e) {
      console.error("Error setting up media query listener:", e);
    }
  }
}
var ThemeProvider = ({ children }) => {
  return children;
};
export {
  ThemeProvider,
  getResolvedTheme,
  getTheme,
  offThemeChange,
  onThemeChange,
  setTheme,
  toggleTheme
};