uncaught reference error in snowflake function-CodePudding

I am getting error with below code, please advise:

CREATE OR REPLACE FUNCTION fnParseString (STRINGTOP VARCHAR,DELIMITER1 VARCHAR)
RETURNS VARCHAR NOT NULL
language javascript
AS
$$ 
var sql_A = `SELECT CASE WHEN charindex(DELIMITER1,STRINGTOP) = 0 THEN 1 ELSE 0 END`;
var statement = snowflake.createStatement({sqlText:sql_A});
var rs = statement.execute();
return rs;
$$;

When I do > select function('this is test',' ');

Getting below error:

JavaScript execution error: Uncaught ReferenceError: snowflake is not defined in FNPARSESTRING at 'var statement = snowflake.createStatement({sqlText:sql_A});' position 16 stackstrace: FNPARSESTRING line: 3

thanks.

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