package.json script conditional

I have a node script that checks for some conditions. Lets call it condition.js. I have another script which runs my program, lets call it runner.js. runner.js is referenced by a command in my package.json file under scripts as well condition.js with their own commands. I want the condition.js to run before runner.js. If a certain condition is true (it checks a string for something) in the condition.js when it runs, I want the second script to run after it. If it is not true, I don't want the second script to run. How can I do this in package.json?