build: use rimraf and mkdirp for prebuild script (#720)
build: use rimraf and mkdirp for prebuild script (#720)


eventualbuddha/decaffeinate,decaffeinate/decaffeinate,eventualbuddha/decaffeinate,alangpierce/decaffeinate,decaffeinate/decaffeinate,alangpierce/decaffeinate,alangpierce/decaffeinate