[mod] theme/simple: migrate codebase to TypeScript

TypeScript is a superset of JavaScript, converting the entire theme to
TypeScript allows us to receive much more feedback on possible issues made in
package updates or our own typos, furthermore, it allows to transpile properly
to lower specs. This PR couldn't be done in smaller commits, a lot of work
needed to make everything *work properly*:

- A browser baseline has been set that requires minimum **Chromium 93, Firefox
  92 and Safari 15** (proper visuals/operation on older browser versions is not
  guaranteed)
- LightningCSS now handles minification and prefix creation for CSS.
- All hardcoded polyfills and support for previous browser baseline versions
  have been removed.
- Convert codebase to TypeScript.
- Convert IIFE to ESM, handling globals with IIFE is cumbersome, ESM is the
  standard for virtually any use of JS nowadays.
- Vite now builds the theme without the need for `vite-plugin-static-copy`.
- `searxng.ready` now accepts an array of conditions for the callback to be
  executed.
- Replace `leaflet` with `ol` as there were some issues with proper Vite
  bundling.
- Merged `head` with `main` script, as head was too small now.
- Add `assertElement` to properly check the existence of critical DOM elements.
- `searxng.on` renamed to `searxng.listen` with some handling improvements.

1 files changed, 0 insertions, 473 deletions

diff --git a/client/simple/src/js/main/keyboard.js b/client/simple/src/js/main/keyboard.js
deleted file mode 100644
index e707c397f..000000000
--- a/client/simple/src/js/main/keyboard.js
+++ /dev/null
@@ -1,473 +0,0 @@
-/* SPDX-License-Identifier: AGPL-3.0-or-later */
-/* global searxng */
-
-searxng.ready(() => {
-  function isElementInDetail(el) {
-    while (el !== undefined) {
-      if (el.classList.contains("detail")) {
-        return true;
-      }
-      if (el.classList.contains("result")) {
-        // we found a result, no need to go to the root of the document:
-        // el is not inside a <div class="detail"> element
-        return false;
-      }
-      el = el.parentNode;
-    }
-    return false;
-  }
-
-  function getResultElement(el) {
-    while (el !== undefined) {
-      if (el.classList.contains("result")) {
-        return el;
-      }
-      el = el.parentNode;
-    }
-    return undefined;
-  }
-
-  function isImageResult(resultElement) {
-    return resultElement?.classList.contains("result-images");
-  }
-
-  searxng.on(".result", "click", function (e) {
-    if (!isElementInDetail(e.target)) {
-      highlightResult(this)(true, true);
-      const resultElement = getResultElement(e.target);
-      if (isImageResult(resultElement)) {
-        e.preventDefault();
-        searxng.selectImage(resultElement);
-      }
-    }
-  });
-
-  searxng.on(
-    ".result a",
-    "focus",
-    (e) => {
-      if (!isElementInDetail(e.target)) {
-        const resultElement = getResultElement(e.target);
-        if (resultElement && resultElement.getAttribute("data-vim-selected") === null) {
-          highlightResult(resultElement)(true);
-        }
-        if (isImageResult(resultElement)) {
-          searxng.selectImage(resultElement);
-        }
-      }
-    },
-    true
-  );
-
-  /* common base for layouts */
-  const baseKeyBinding = {
-    Escape: {
-      key: "ESC",
-      fun: removeFocus,
-      des: "remove focus from the focused input",
-      cat: "Control"
-    },
-    c: {
-      key: "c",
-      fun: copyURLToClipboard,
-      des: "copy url of the selected result to the clipboard",
-      cat: "Results"
-    },
-    h: {
-      key: "h",
-      fun: toggleHelp,
-      des: "toggle help window",
-      cat: "Other"
-    },
-    i: {
-      key: "i",
-      fun: searchInputFocus,
-      des: "focus on the search input",
-      cat: "Control"
-    },
-    n: {
-      key: "n",
-      fun: GoToNextPage(),
-      des: "go to next page",
-      cat: "Results"
-    },
-    o: {
-      key: "o",
-      fun: openResult(false),
-      des: "open search result",
-      cat: "Results"
-    },
-    p: {
-      key: "p",
-      fun: GoToPreviousPage(),
-      des: "go to previous page",
-      cat: "Results"
-    },
-    r: {
-      key: "r",
-      fun: reloadPage,
-      des: "reload page from the server",
-      cat: "Control"
-    },
-    t: {
-      key: "t",
-      fun: openResult(true),
-      des: "open the result in a new tab",
-      cat: "Results"
-    }
-  };
-  const keyBindingLayouts = {
-    default: Object.assign(
-      {
-        /* SearXNG layout */
-        ArrowLeft: {
-          key: "←",
-          fun: highlightResult("up"),
-          des: "select previous search result",
-          cat: "Results"
-        },
-        ArrowRight: {
-          key: "→",
-          fun: highlightResult("down"),
-          des: "select next search result",
-          cat: "Results"
-        }
-      },
-      baseKeyBinding
-    ),
-
-    vim: Object.assign(
-      {
-        /* Vim-like Key Layout. */
-        b: {
-          key: "b",
-          fun: scrollPage(-window.innerHeight),
-          des: "scroll one page up",
-          cat: "Navigation"
-        },
-        f: {
-          key: "f",
-          fun: scrollPage(window.innerHeight),
-          des: "scroll one page down",
-          cat: "Navigation"
-        },
-        u: {
-          key: "u",
-          fun: scrollPage(-window.innerHeight / 2),
-          des: "scroll half a page up",
-          cat: "Navigation"
-        },
-        d: {
-          key: "d",
-          fun: scrollPage(window.innerHeight / 2),
-          des: "scroll half a page down",
-          cat: "Navigation"
-        },
-        g: {
-          key: "g",
-          fun: scrollPageTo(-document.body.scrollHeight, "top"),
-          des: "scroll to the top of the page",
-          cat: "Navigation"
-        },
-        v: {
-          key: "v",
-          fun: scrollPageTo(document.body.scrollHeight, "bottom"),
-          des: "scroll to the bottom of the page",
-          cat: "Navigation"
-        },
-        k: {
-          key: "k",
-          fun: highlightResult("up"),
-          des: "select previous search result",
-          cat: "Results"
-        },
-        j: {
-          key: "j",
-          fun: highlightResult("down"),
-          des: "select next search result",
-          cat: "Results"
-        },
-        y: {
-          key: "y",
-          fun: copyURLToClipboard,
-          des: "copy url of the selected result to the clipboard",
-          cat: "Results"
-        }
-      },
-      baseKeyBinding
-    )
-  };
-
-  const keyBindings = keyBindingLayouts[searxng.settings.hotkeys] || keyBindingLayouts.default;
-
-  searxng.on(document, "keydown", (e) => {
-    // check for modifiers so we don't break browser's hotkeys
-    if (
-      // biome-ignore lint/suspicious/noPrototypeBuiltins: FIXME: support for Chromium 93-87, Firefox 92-78, Safari 15.4-14
-      Object.prototype.hasOwnProperty.call(keyBindings, e.key) &&
-      !e.ctrlKey &&
-      !e.altKey &&
-      !e.shiftKey &&
-      !e.metaKey
-    ) {
-      const tagName = e.target.tagName.toLowerCase();
-      if (e.key === "Escape") {
-        keyBindings[e.key].fun(e);
-      } else {
-        if (e.target === document.body || tagName === "a" || tagName === "button") {
-          e.preventDefault();
-          keyBindings[e.key].fun();
-        }
-      }
-    }
-  });
-
-  function highlightResult(which) {
-    return (noScroll, keepFocus) => {
-      let current = document.querySelector(".result[data-vim-selected]"),
-        effectiveWhich = which;
-      if (current === null) {
-        // no selection : choose the first one
-        current = document.querySelector(".result");
-        if (current === null) {
-          // no first one : there are no results
-          return;
-        }
-        // replace up/down actions by selecting first one
-        if (which === "down" || which === "up") {
-          effectiveWhich = current;
-        }
-      }
-
-      let next,
-        results = document.querySelectorAll(".result");
-      results = Array.from(results); // convert NodeList to Array for further use
-
-      if (typeof effectiveWhich !== "string") {
-        next = effectiveWhich;
-      } else {
-        switch (effectiveWhich) {
-          case "visible": {
-            const top = document.documentElement.scrollTop || document.body.scrollTop;
-            const bot = top + document.documentElement.clientHeight;
-
-            for (let i = 0; i < results.length; i++) {
-              next = results[i];
-              const etop = next.offsetTop;
-              const ebot = etop + next.clientHeight;
-
-              if (ebot <= bot && etop > top) {
-                break;
-              }
-            }
-            break;
-          }
-          case "down":
-            next = results[results.indexOf(current) + 1] || current;
-            break;
-          case "up":
-            next = results[results.indexOf(current) - 1] || current;
-            break;
-          case "bottom":
-            next = results[results.length - 1];
-            break;
-          // biome-ignore lint/complexity/noUselessSwitchCase: fallthrough is intended
-          case "top":
-          /* falls through */
-          default:
-            next = results[0];
-        }
-      }
-
-      if (next) {
-        current.removeAttribute("data-vim-selected");
-        next.setAttribute("data-vim-selected", "true");
-        if (!keepFocus) {
-          const link = next.querySelector("h3 a") || next.querySelector("a");
-          if (link !== null) {
-            link.focus();
-          }
-        }
-        if (!noScroll) {
-          scrollPageToSelected();
-        }
-      }
-    };
-  }
-
-  function reloadPage() {
-    document.location.reload(true);
-  }
-
-  function removeFocus(e) {
-    const tagName = e.target.tagName.toLowerCase();
-    if (document.activeElement && (tagName === "input" || tagName === "select" || tagName === "textarea")) {
-      document.activeElement.blur();
-    } else {
-      searxng.closeDetail();
-    }
-  }
-
-  function pageButtonClick(css_selector) {
-    return () => {
-      const button = document.querySelector(css_selector);
-      if (button) {
-        button.click();
-      }
-    };
-  }
-
-  function GoToNextPage() {
-    return pageButtonClick('nav#pagination .next_page button[type="submit"]');
-  }
-
-  function GoToPreviousPage() {
-    return pageButtonClick('nav#pagination .previous_page button[type="submit"]');
-  }
-
-  function scrollPageToSelected() {
-    const sel = document.querySelector(".result[data-vim-selected]");
-    if (sel === null) {
-      return;
-    }
-    const wtop = document.documentElement.scrollTop || document.body.scrollTop,
-      wheight = document.documentElement.clientHeight,
-      etop = sel.offsetTop,
-      ebot = etop + sel.clientHeight,
-      offset = 120;
-    // first element ?
-    if (sel.previousElementSibling === null && ebot < wheight) {
-      // set to the top of page if the first element
-      // is fully included in the viewport
-      window.scroll(window.scrollX, 0);
-      return;
-    }
-    if (wtop > etop - offset) {
-      window.scroll(window.scrollX, etop - offset);
-    } else {
-      const wbot = wtop + wheight;
-      if (wbot < ebot + offset) {
-        window.scroll(window.scrollX, ebot - wheight + offset);
-      }
-    }
-  }
-
-  function scrollPage(amount) {
-    return () => {
-      window.scrollBy(0, amount);
-      highlightResult("visible")();
-    };
-  }
-
-  function scrollPageTo(position, nav) {
-    return () => {
-      window.scrollTo(0, position);
-      highlightResult(nav)();
-    };
-  }
-
-  function searchInputFocus() {
-    window.scrollTo(0, 0);
-    const q = document.querySelector("#q");
-    q.focus();
-    if (q.setSelectionRange) {
-      const len = q.value.length;
-      q.setSelectionRange(len, len);
-    }
-  }
-
-  function openResult(newTab) {
-    return () => {
-      let link = document.querySelector(".result[data-vim-selected] h3 a");
-      if (link === null) {
-        link = document.querySelector(".result[data-vim-selected] > a");
-      }
-      if (link !== null) {
-        const url = link.getAttribute("href");
-        if (newTab) {
-          window.open(url);
-        } else {
-          window.location.href = url;
-        }
-      }
-    };
-  }
-
-  function initHelpContent(divElement) {
-    const categories = {};
-
-    for (const k in keyBindings) {
-      const key = keyBindings[k];
-      categories[key.cat] = categories[key.cat] || [];
-      categories[key.cat].push(key);
-    }
-
-    const sorted = Object.keys(categories).sort((a, b) => categories[b].length - categories[a].length);
-
-    if (sorted.length === 0) {
-      return;
-    }
-
-    let html = '<a href="#" class="close" aria-label="close" title="close">×</a>';
-    html += "<h3>How to navigate SearXNG with hotkeys</h3>";
-    html += "<table>";
-
-    for (let i = 0; i < sorted.length; i++) {
-      const cat = categories[sorted[i]];
-
-      const lastCategory = i === sorted.length - 1;
-      const first = i % 2 === 0;
-
-      if (first) {
-        html += "<tr>";
-      }
-      html += "<td>";
-
-      html += `<h4>${cat[0].cat}</h4>`;
-      html += '<ul class="list-unstyled">';
-
-      for (const cj in cat) {
-        html += `<li><kbd>${cat[cj].key}</kbd> ${cat[cj].des}</li>`;
-      }
-
-      html += "</ul>";
-      html += "</td>"; // col-sm-*
-
-      if (!first || lastCategory) {
-        html += "</tr>"; // row
-      }
-    }
-
-    html += "</table>";
-
-    divElement.innerHTML = html;
-  }
-
-  function toggleHelp() {
-    let helpPanel = document.querySelector("#vim-hotkeys-help");
-    if (helpPanel === undefined || helpPanel === null) {
-      // first call
-      helpPanel = document.createElement("div");
-      helpPanel.id = "vim-hotkeys-help";
-      helpPanel.className = "dialog-modal";
-      initHelpContent(helpPanel);
-      const body = document.getElementsByTagName("body")[0];
-      body.appendChild(helpPanel);
-    } else {
-      // toggle hidden
-      helpPanel.classList.toggle("invisible");
-    }
-  }
-
-  function copyURLToClipboard() {
-    const currentUrlElement = document.querySelector(".result[data-vim-selected] h3 a");
-    if (currentUrlElement === null) return;
-
-    const url = currentUrlElement.getAttribute("href");
-    navigator.clipboard.writeText(url);
-  }
-
-  searxng.scrollPageToSelected = scrollPageToSelected;
-  searxng.selectNext = highlightResult("down");
-  searxng.selectPrevious = highlightResult("up");
-});