code: function validateEventDefinition(node) {
        if (node.key.type !== 'Literal') return;
  
        const spec = node.key.value;
        const clauses = spec.split(/,\s+/);
        clauses.forEach(clause => {
          const parts = clause.split(/\s+/);
  
          if (parts.length === 1) {
            if (mode === 'strict') {
              context.report(node.key, 'Missing selector');
            }
            return;
          }
  
          const selector = parts[1];
  
          if (selector.startsWith('.')) {
            if (!selector.startsWith(`.${prefix}`)) {
              context.report(
                node.key,
                `Expected selector to be prefixed with "${prefix}"`
              );
            } else if (selector === `.${prefix}`) {
              context.report(node.key, 'Selector may not consist of prefix only');
            }
          } else if (mode === 'strict') {
            context.report(node.key, 'Expected selector to be a class');
          }
        });
      }
docs: algorithm to parse event map selector taken from blaze itself https://github.com/meteor/meteor/blob/15a0369581ef27a6d3d49cb0110d10b1198d5383/packages/blaze/view.js#L867