1

node_modules/html-entities/src/surrogate-pairs.ts

@@ -0,0 +1,20 @@
+export const fromCodePoint =
+    String.fromCodePoint ||
+    function (astralCodePoint: number) {
+        return String.fromCharCode(
+            Math.floor((astralCodePoint - 0x10000) / 0x400) + 0xd800,
+            ((astralCodePoint - 0x10000) % 0x400) + 0xdc00
+        );
+    };
+
+// @ts-expect-error - String.prototype.codePointAt might not exist in older node versions
+export const getCodePoint = String.prototype.codePointAt
+    ? function (input: string, position: number) {
+          return input.codePointAt(position);
+      }
+    : function (input: string, position: number) {
+          return (input.charCodeAt(position) - 0xd800) * 0x400 + input.charCodeAt(position + 1) - 0xdc00 + 0x10000;
+      };
+
+export const highSurrogateFrom = 0xd800;
+export const highSurrogateTo = 0xdbff;