| [ | 
 |   { | 
 |     "cmd": [ | 
 |       "cipd", | 
 |       "ensure", | 
 |       "-root", | 
 |       "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/drivers/firefox", | 
 |       "-ensure-file", | 
 |       "flutter_internal/browser-drivers/firefoxdriver-linux latest", | 
 |       "-max-threads", | 
 |       "0", | 
 |       "-json-output", | 
 |       "/path/to/tmp/json" | 
 |     ], | 
 |     "name": "ensure_installed", | 
 |     "~followup_annotations": [ | 
 |       "@@@STEP_LOG_LINE@json.output@{@@@", | 
 |       "@@@STEP_LOG_LINE@json.output@  \"result\": {@@@", | 
 |       "@@@STEP_LOG_LINE@json.output@    \"\": [@@@", | 
 |       "@@@STEP_LOG_LINE@json.output@      {@@@", | 
 |       "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-latest----------\", @@@", | 
 |       "@@@STEP_LOG_LINE@json.output@        \"package\": \"flutter_internal/browser-drivers/firefoxdriver-linux\"@@@", | 
 |       "@@@STEP_LOG_LINE@json.output@      }@@@", | 
 |       "@@@STEP_LOG_LINE@json.output@    ]@@@", | 
 |       "@@@STEP_LOG_LINE@json.output@  }@@@", | 
 |       "@@@STEP_LOG_LINE@json.output@}@@@", | 
 |       "@@@STEP_LOG_END@json.output@@@" | 
 |     ] | 
 |   }, | 
 |   { | 
 |     "name": "$result" | 
 |   } | 
 | ] |