export class SQLStatement {

  private strings: string[];

  /**
   * The SQL Statement for [node-postgres](https://www.npmjs.com/package/pg)
   */
  text: string;

  /**
   * The SQL Statement for [Sequelize](https://www.npmjs.com/package/sequelize)
   */
  query: string

  /**
   * The SQL Statement for [mysql](https://www.npmjs.com/package/mysql)
   */
  sql: string;

  /**
   * The values to be inserted for the placeholders
   */
  values: any[];

  /**
   * The name for postgres prepared statements, if set
   */
  name: string;

  /**
   * Appends a string or another statement
   *
   * ```ts
   * query.append(SQL`AND genre = ${genre}`).append(' ORDER BY rating')
   * query.text   // => 'SELECT author FROM books WHERE name = $1 AND author = $2 AND genre = $3 ORDER BY rating'
   * query.sql    // => 'SELECT author FROM books WHERE name = ? AND author = ? AND genre = ? ORDER BY rating'
   * query.values // => ['harry potter', 'J. K. Rowling', 'Fantasy'] ORDER BY rating`
   *
   * const query = SQL`SELECT * FROM books`
   * if (params.name) {
   *   query.append(SQL` WHERE name = ${params.name}`)
   * }
   * query.append(SQL` LIMIT 10 OFFSET ${params.offset || 0}`)
   * ```
   */
  append(statement: SQLStatement|string|number): this;

  /**
   * Sets the name property of this statement for prepared statements in postgres
   *
   * ```ts
   * pg.query(SQL`SELECT author FROM books WHERE name = ${book}`.setName('my_query'))
   * ```
   */
  setName(name: string): this;

  /**
   * Use a prepared statement with Sequelize.
   * Makes `query` return a query with `$n` syntax instead of `?`  and switches the `values` key name to `bind`
   * If omitted, `value` defaults to `true`.
   */
  useBind(value?: boolean): this;
}

/**
 * The template string tag
 *
 * ```ts
 * import {SQL} from 'sql-template-strings';
 *
 * pg.query(SQL`SELECT author FROM books WHERE name = ${book} AND author = ${author}`)
 * ```
 */
export function SQL(strings: any, ...values: any[]): SQLStatement;
export default SQL;