code: function getShebangInfo(sourceCode) {
      const m = SHEBANG_PATTERN.exec(sourceCode.text)
  
      return {
          bom: sourceCode.hasBOM,
          cr: Boolean(m && m[2]),
          length: (m && m[0].length) || 0,
          shebang: (m && m[1] && `${m[1]}\n`) || "",
      }
  }
docs: Gets the shebang line (includes a line ending) from a given code.
  
  @param {SourceCode} sourceCode - A source code object to check.
  @returns {{length: number, bom: boolean, shebang: string, cr: boolean}}
  shebang's information.
  `retv.shebang` is an empty string if shebang doesn't exist.