lambda-upgrade-runtime.mjs

#!/usr/bin/env zx

//
// Get array of lambda ARNs
//
let lambdas = JSON.parse(
  await $`aws lambda list-functions --function-version ALL --output json --query "Functions[?Runtime=='nodejs10.x'].FunctionArn"`
)

//
// Iterate over them and update
//
for (let l of lambdas) {
  //
  // l = "arn:aws:lambda:us-west-2:500402104533:function:news:$LATEST"
  //
  const split = l.split(':')

  const functionName = split[split.length - 2]

  //
  // functionName = news
  //
  console.log(`Updating lambda function ${functionName}`)

  await $`aws lambda update-function-configuration --runtime nodejs14.x --function-name ${functionName}`
}