This file is indexed.

/usr/share/sensor_msgs/msg/JoyFeedback.msg is in libsensor-msgs-dev 1.12.3-5.

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# Declare of the type of feedback
uint8 TYPE_LED    = 0
uint8 TYPE_RUMBLE = 1
uint8 TYPE_BUZZER = 2

uint8 type

# This will hold an id number for each type of each feedback.
# Example, the first led would be id=0, the second would be id=1
uint8 id

# Intensity of the feedback, from 0.0 to 1.0, inclusive.  If device is
# actually binary, driver should treat 0<=x<0.5 as off, 0.5<=x<=1 as on.
float32 intensity