build: switch from yarn to npm to manage js dependencies and move js contents to root

yarn v1 is being deprecated and starts to have some issues

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

src/filters/datetime.ts

@@ -0,0 +1,79 @@
+import { i18n } from "../utils/i18n";
+
+function parseDateTime(value: string): Date {
+  return new Date(value);
+}
+
+function formatDateString(value: string): string {
+  return parseDateTime(value).toLocaleString(locale(), {
+    weekday: "long",
+    year: "numeric",
+    month: "long",
+    day: "numeric",
+  });
+}
+
+function formatTimeString(value: string, timeZone?: string): string {
+  return parseDateTime(value).toLocaleTimeString(locale(), {
+    hour: "numeric",
+    minute: "numeric",
+    timeZone,
+  });
+}
+
+// TODO: These can be removed in favor of dateStyle/timeStyle when those two have sufficient support
+// https://caniuse.com/mdn-javascript_builtins_intl_datetimeformat_datetimeformat_datestyle
+const LONG_DATE_FORMAT_OPTIONS: any = {
+  weekday: undefined,
+  year: "numeric",
+  month: "long",
+  day: "numeric",
+  hour: undefined,
+  minute: undefined,
+};
+
+const LONG_TIME_FORMAT_OPTIONS: any = {
+  weekday: "long",
+  hour: "numeric",
+  minute: "numeric",
+};
+
+const SHORT_DATE_FORMAT_OPTIONS: any = {
+  weekday: undefined,
+  year: "numeric",
+  month: "short",
+  day: "numeric",
+  hour: undefined,
+  minute: undefined,
+};
+
+const SHORT_TIME_FORMAT_OPTIONS: any = {
+  weekday: "short",
+  hour: "numeric",
+  minute: "numeric",
+};
+
+function formatDateTimeString(
+  value: string,
+  timeZone: string | null | undefined = undefined,
+  showTime = true,
+  dateFormat = "long"
+): string {
+  const isLongFormat = dateFormat === "long";
+  let options = isLongFormat
+    ? LONG_DATE_FORMAT_OPTIONS
+    : SHORT_DATE_FORMAT_OPTIONS;
+  if (showTime) {
+    options = {
+      ...options,
+      ...(isLongFormat ? LONG_TIME_FORMAT_OPTIONS : SHORT_TIME_FORMAT_OPTIONS),
+      timeZone: timeZone || undefined,
+    };
+  }
+  const format = new Intl.DateTimeFormat(locale(), options);
+  return format.format(parseDateTime(value));
+}
+
+const locale = () => i18n.global.locale.replace("_", "-");
+
+export { formatDateString, formatTimeString, formatDateTimeString };