mandatory-dependency.md

Mandatory Dependency

A mandatory dependency is:

• a function that your function calls
• that your function receives as a parameter from the caller
• and the parameter has no default value

For example:

// `logger` is a mandatory dependency
// the caller has to provide it
//
// `db` is also a mandatory dependency
// the caller has to provide it as well
function doQuery(logger: Logger, db: DbConn, sql: string): unknown {
    logger.debug("executing query: " + sql);

    return db.query(sql);
}