Add sqlstring.raw to sqlstring type definitions.

types/sqlstring/index.d.ts

@@ -7,3 +7,4 @@
 export function format(sql: string, args: object | any[]): string;
 export function escape(value: any): string;
 export function escapeId(value: any, dotQualifier?: boolean): string;
+export function raw(sql: string): { toSqlString: () => string };

types/sqlstring/sqlstring-tests.ts

@@ -29,3 +29,10 @@ const sql6 =
 const userId4 = 1;
 const inserts = ["users", "id", userId4];
 const sql7 = SqlString.format("SELECT * FROM ?? WHERE ?? = ?", inserts);
+
+const userId4 = 1;
+const inserts = ["users", "id", userId4];
+const sql7 = SqlString.format("SELECT * FROM ?? WHERE ?? = ?", inserts);
+
+var CURRENT_TIMESTAMP = SqlString.raw('CURRENT_TIMESTAMP()');
+const sql8 = SqlString.format('UPDATE posts SET modified = ? WHERE id = ?', [CURRENT_TIMESTAMP, 42]);