[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, 197 deletions

diff --git a/client/simple/src/js/main/search.js b/client/simple/src/js/main/search.js
deleted file mode 100644
index 5d1e18bde..000000000
--- a/client/simple/src/js/main/search.js
+++ /dev/null
@@ -1,197 +0,0 @@
-/* SPDX-License-Identifier: AGPL-3.0-or-later */
-/* exported AutoComplete */
-
-((_w, d, searxng) => {
-  const qinput_id = "q";
-  let qinput;
-
-  const isMobile = window.matchMedia("only screen and (max-width: 50em)").matches;
-  const isResultsPage = document.querySelector("main").id === "main_results";
-
-  function submitIfQuery() {
-    if (qinput.value.length > 0) {
-      const search = document.getElementById("search");
-      setTimeout(search.submit.bind(search), 0);
-    }
-  }
-
-  function createClearButton(qinput) {
-    const cs = document.getElementById("clear_search");
-    const updateClearButton = () => {
-      if (qinput.value.length === 0) {
-        cs.classList.add("empty");
-      } else {
-        cs.classList.remove("empty");
-      }
-    };
-
-    // update status, event listener
-    updateClearButton();
-    cs.addEventListener("click", (ev) => {
-      qinput.value = "";
-      qinput.focus();
-      updateClearButton();
-      ev.preventDefault();
-    });
-    qinput.addEventListener("input", updateClearButton, false);
-  }
-
-  const fetchResults = async (query) => {
-    let request;
-    if (searxng.settings.method === "GET") {
-      const reqParams = new URLSearchParams();
-      reqParams.append("q", query);
-      request = fetch(`./autocompleter?${reqParams.toString()}`);
-    } else {
-      const formData = new FormData();
-      formData.append("q", query);
-      request = fetch("./autocompleter", {
-        method: "POST",
-        body: formData
-      });
-    }
-
-    request.then(async (response) => {
-      const results = await response.json();
-
-      if (!results) return;
-
-      const autocomplete = d.querySelector(".autocomplete");
-      const autocompleteList = d.querySelector(".autocomplete ul");
-      autocomplete.classList.add("open");
-      autocompleteList.innerHTML = "";
-
-      // show an error message that no result was found
-      if (!results[1] || results[1].length === 0) {
-        const noItemFoundMessage = document.createElement("li");
-        noItemFoundMessage.classList.add("no-item-found");
-        noItemFoundMessage.innerHTML = searxng.settings.translations.no_item_found;
-        autocompleteList.appendChild(noItemFoundMessage);
-        return;
-      }
-
-      for (const result of results[1]) {
-        const li = document.createElement("li");
-        li.innerText = result;
-
-        searxng.on(li, "mousedown", () => {
-          qinput.value = result;
-          const form = d.querySelector("#search");
-          form.submit();
-          autocomplete.classList.remove("open");
-        });
-        autocompleteList.appendChild(li);
-      }
-    });
-  };
-
-  searxng.ready(() => {
-    // focus search input on large screens
-    if (!isMobile && !isResultsPage) document.getElementById("q").focus();
-
-    qinput = d.getElementById(qinput_id);
-    const autocomplete = d.querySelector(".autocomplete");
-    const autocompleteList = d.querySelector(".autocomplete ul");
-
-    if (qinput !== null) {
-      // clear button
-      createClearButton(qinput);
-
-      // autocompleter
-      if (searxng.settings.autocomplete) {
-        searxng.on(qinput, "input", () => {
-          const query = qinput.value;
-          if (query.length < searxng.settings.autocomplete_min) return;
-
-          setTimeout(() => {
-            if (query === qinput.value) fetchResults(query);
-          }, 300);
-        });
-
-        searxng.on(qinput, "keyup", (e) => {
-          let currentIndex = -1;
-          const listItems = autocompleteList.children;
-          for (let i = 0; i < listItems.length; i++) {
-            if (listItems[i].classList.contains("active")) {
-              currentIndex = i;
-              break;
-            }
-          }
-
-          let newCurrentIndex = -1;
-          if (e.key === "ArrowUp") {
-            if (currentIndex >= 0) listItems[currentIndex].classList.remove("active");
-            // we need to add listItems.length to the index calculation here because the JavaScript modulos
-            // operator doesn't work with negative numbers
-            newCurrentIndex = (currentIndex - 1 + listItems.length) % listItems.length;
-          } else if (e.key === "ArrowDown") {
-            if (currentIndex >= 0) listItems[currentIndex].classList.remove("active");
-            newCurrentIndex = (currentIndex + 1) % listItems.length;
-          } else if (e.key === "Tab" || e.key === "Enter") {
-            autocomplete.classList.remove("open");
-          }
-
-          if (newCurrentIndex !== -1) {
-            const selectedItem = listItems[newCurrentIndex];
-            selectedItem.classList.add("active");
-
-            if (!selectedItem.classList.contains("no-item-found")) qinput.value = selectedItem.innerText;
-          }
-        });
-      }
-    }
-
-    // Additionally to searching when selecting a new category, we also
-    // automatically start a new search request when the user changes a search
-    // filter (safesearch, time range or language) (this requires JavaScript
-    // though)
-    if (
-      qinput !== null &&
-      searxng.settings.search_on_category_select &&
-      // If .search_filters is undefined (invisible) we are on the homepage and
-      // hence don't have to set any listeners
-      d.querySelector(".search_filters") != null
-    ) {
-      searxng.on(d.getElementById("safesearch"), "change", submitIfQuery);
-      searxng.on(d.getElementById("time_range"), "change", submitIfQuery);
-      searxng.on(d.getElementById("language"), "change", submitIfQuery);
-    }
-
-    const categoryButtons = d.querySelectorAll("button.category_button");
-    for (const button of categoryButtons) {
-      searxng.on(button, "click", (event) => {
-        if (event.shiftKey) {
-          event.preventDefault();
-          button.classList.toggle("selected");
-          return;
-        }
-
-        // manually deselect the old selection when a new category is selected
-        const selectedCategories = d.querySelectorAll("button.category_button.selected");
-        for (const categoryButton of selectedCategories) {
-          categoryButton.classList.remove("selected");
-        }
-        button.classList.add("selected");
-      });
-    }
-
-    // override form submit action to update the actually selected categories
-    const form = d.querySelector("#search");
-    if (form != null) {
-      searxng.on(form, "submit", (event) => {
-        event.preventDefault();
-        const categoryValuesInput = d.querySelector("#selected-categories");
-        if (categoryValuesInput) {
-          const categoryValues = [];
-          for (const categoryButton of categoryButtons) {
-            if (categoryButton.classList.contains("selected")) {
-              categoryValues.push(categoryButton.name.replace("category_", ""));
-            }
-          }
-          categoryValuesInput.value = categoryValues.join(",");
-        }
-        form.submit();
-      });
-    }
-  });
-})(window, document, window.searxng);