spaghetti with avocado basil sauce

i've had this recipe pinned on pinterest for like seven months but just got around to making it. WHY DID I WAIT SO LONG? this creamy (yet vegan) love child of pesto and guacamole is, without a doubt, the best thing i've tasted in quite some time.

spaghetti with avocado basil sauce adapted from here

1 box gluten-free spaghetti
1 medium ripe avocado
juice of 1 small lime
juice of 1 small lemon
2 tbsp extra virgin olive oil
2 garlic cloves
1/2 tsp red chili flakes 
1 tsp salt
1/4 cup packed fresh basil
1 cup spinach

cook spaghetti according to directions, reserving 1/4 cup of cooking liquid before draining and set aside. while spaghetti is cooking, pit the avocado and scoop the flesh into a food processor. add the rest of the ingredients and blend until everything is incorporated. add the reserved cooking liquid and blend to thin the sauce out a bit, then toss with the cooked pasta.