--- Returns \`\`true\`\` if the string \`str\` ends with the substring \`ending\`, \`\`false\`\` otherwise.
--- @param str string The string to check.
--- @param ending string The substring to check for at the end of \`str\`.
--- @return boolean \`\`true\`\` if \`str\` ends with \`ending\`, \`\`false\`\` otherwise.
function string_endswith(str: string, ending: string) end