1 files changed, 81 insertions, 0 deletions
diff --git a/node_modules/entities/src/decode-codepoint.ts b/node_modules/entities/src/decode-codepoint.ts
new file mode 100644
index 0000000..d21de7b
--- /dev/null
+++ b/node_modules/entities/src/decode-codepoint.ts
@@ -0,0 +1,81 @@
+// Adapted from https://github.com/mathiasbynens/he/blob/36afe179392226cf1b6ccdb16ebbb7a5a844d93a/src/he.js#L106-L134
+
+const decodeMap = new Map([
+    [0, 65_533],
+    // C1 Unicode control character reference replacements
+    [128, 8364],
+    [130, 8218],
+    [131, 402],
+    [132, 8222],
+    [133, 8230],
+    [134, 8224],
+    [135, 8225],
+    [136, 710],
+    [137, 8240],
+    [138, 352],
+    [139, 8249],
+    [140, 338],
+    [142, 381],
+    [145, 8216],
+    [146, 8217],
+    [147, 8220],
+    [148, 8221],
+    [149, 8226],
+    [150, 8211],
+    [151, 8212],
+    [152, 732],
+    [153, 8482],
+    [154, 353],
+    [155, 8250],
+    [156, 339],
+    [158, 382],
+    [159, 376],
+]);
+
+/**
+ * Polyfill for `String.fromCodePoint`. It is used to create a string from a Unicode code point.
+ */
+export const fromCodePoint: (...codePoints: number[]) => string =
+    // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition, n/no-unsupported-features/es-builtins
+    String.fromCodePoint ??
+    function (codePoint: number): string {
+        let output = "";
+
+        if (codePoint > 0xff_ff) {
+            codePoint -= 0x1_00_00;
+            output += String.fromCharCode(
+                ((codePoint >>> 10) & 0x3_ff) | 0xd8_00,
+            );
+            codePoint = 0xdc_00 | (codePoint & 0x3_ff);
+        }
+
+        output += String.fromCharCode(codePoint);
+        return output;
+    };
+
+/**
+ * Replace the given code point with a replacement character if it is a
+ * surrogate or is outside the valid range. Otherwise return the code
+ * point unchanged.
+ */
+export function replaceCodePoint(codePoint: number): number {
+    if (
+        (codePoint >= 0xd8_00 && codePoint <= 0xdf_ff) ||
+        codePoint > 0x10_ff_ff
+    ) {
+        return 0xff_fd;
+    }
+
+    return decodeMap.get(codePoint) ?? codePoint;
+}
+
+/**
+ * Replace the code point if relevant, then convert it to a string.
+ *
+ * @deprecated Use `fromCodePoint(replaceCodePoint(codePoint))` instead.
+ * @param codePoint The code point to decode.
+ * @returns The decoded code point.
+ */
+export function decodeCodePoint(codePoint: number): string {
+    return fromCodePoint(replaceCodePoint(codePoint));
+}