export const encode:()

in internal/qs/utils.ts [141:220]

• 67 lines of code
• 24 McCabe index (conditional complexity)

export const encode: (
  str: any,
  defaultEncoder: DefaultEncoder,
  charset: string,
  type: "key" | "value",
  format: Format,
) => string = (str, _defaultEncoder, charset, _kind, format: Format) => {
  // This code was originally written by Brian White for the io.js core querystring library.
  // It has been adapted here for stricter adherence to RFC 3986
  if (str.length === 0) {
    return str;
  }

  let string = str;
  if (typeof str === "symbol") {
    string = Symbol.prototype.toString.call(str);
  } else if (typeof str !== "string") {
    string = String(str);
  }

  if (charset === "iso-8859-1") {
    return escape(string).replace(/%u[0-9a-f]{4}/gi, function ($0) {
      return "%26%23" + parseInt($0.slice(2), 16) + "%3B";
    });
  }

  let out = "";
  for (let j = 0; j < string.length; j += limit) {
    const segment = string.length >= limit
      ? string.slice(j, j + limit)
      : string;
    const arr = [];

    for (let i = 0; i < segment.length; ++i) {
      let c = segment.charCodeAt(i);
      if (
        c === 0x2d || // -
        c === 0x2e || // .
        c === 0x5f || // _
        c === 0x7e || // ~
        (c >= 0x30 && c <= 0x39) || // 0-9
        (c >= 0x41 && c <= 0x5a) || // a-z
        (c >= 0x61 && c <= 0x7a) || // A-Z
        (format === RFC1738 && (c === 0x28 || c === 0x29)) // ( )
      ) {
        arr[arr.length] = segment.charAt(i);
        continue;
      }

      if (c < 0x80) {
        arr[arr.length] = hex_table[c];
        continue;
      }

      if (c < 0x800) {
        arr[arr.length] = hex_table[0xc0 | (c >> 6)]! +
          hex_table[0x80 | (c & 0x3f)];
        continue;
      }

      if (c < 0xd800 || c >= 0xe000) {
        arr[arr.length] = hex_table[0xe0 | (c >> 12)]! +
          hex_table[0x80 | ((c >> 6) & 0x3f)] + hex_table[0x80 | (c & 0x3f)];
        continue;
      }

      i += 1;
      c = 0x10000 + (((c & 0x3ff) << 10) | (segment.charCodeAt(i) & 0x3ff));

      arr[arr.length] = hex_table[0xf0 | (c >> 18)]! +
        hex_table[0x80 | ((c >> 12) & 0x3f)] +
        hex_table[0x80 | ((c >> 6) & 0x3f)] +
        hex_table[0x80 | (c & 0x3f)];
    }

    out += arr.join("");
  }

  return out;
};