Alternative to import java.lang._, scala._, scala.Predef._. Prelude is a subset of the default imports, meaning that any code compiled under -Yno-imports & import prelude._ should also compile with the default scalac configuration.

scalacOptions in ThisBuild +=
  "-Yno-imports"

libraryDependencies +=
  "in.nvilla" %%% "prelude" % "latest.integration"

import prelude._

0. Update build.sbt

1. Add a prelude import after the first empty line of each .scala file:

   git ls-files | grep -e '.scala$' |\
   while read file; do
     if ! grep -q "import prelude._" "$file"; then
       sed -i.class '1,/^$/ {/^$/aimport prelude._
   }' "$file"
     fi
   done

2. Explicitly import what your project uses scala._ and scala.Predef._:

   git ls-files | grep -e '.scala$' |\
   while read file; do
     for import in                               \
         "import scala.collection.immutable.Seq" \
         "import scala.collection.immutable.Set" \
         "import scala.collection.immutable.Map" \
         ; do # ^ Add imports as needed
       class=$(echo $import | rev | cut -d "." -f1 | rev)
   
       if grep -q "$class" "$file" && ! grep -q "$import" "$file"; then
         sed -i.class '1,/^$/ {/^$/a'"$import"'
   }' "$file"
       fi
     done
   done