Here is a list of all files with brief descriptions:

docs
include
scratchcpp
test
scriptbuilder.h
asset.h
block.h
blockprototype.h
broadcast.h
comment.h
compiler.h
compilerconstant.h
compilercontext.h
compilerlocalvariable.h
compilervalue.h
costume.h
drawable.h
entity.h
enum_bitmask.h
executablecode.h
executioncontext.h
field.h
global.h
iengine.h
iextension.h
igraphicseffect.h
imonitorhandler.h
input.h
inputvalue.h
irandomgenerator.h
ispritehandler.h
istacktimer.h
istagehandler.h
itimer.h
keyevent.h
list.h
monitor.h
project.h
promise.h
rect.h
scratchconfiguration.h
script.h
sound.h
sprite.h
stage.h
string_functions.h
string_pool.h
stringptr.h
target.h
textbubble.h
thread.h
value.h
value_functions.h
valuedata.h
variable.h
src
engine
compiler.cpp
compilerconstant.cpp
compilercontext.cpp
compilerlocalvariable.cpp
compilervalue.cpp
executioncontext.cpp
promise.cpp
script.cpp
thread.cpp
scratch
asset.cpp
block.cpp
blockprototype.cpp
broadcast.cpp
comment.cpp
costume.cpp
drawable.cpp
entity.cpp
field.cpp
input.cpp
inputvalue.cpp
keyevent.cpp
list.cpp
list_functions.cpp
list_functions.h
monitor.cpp
sound.cpp
sprite.cpp
stage.cpp
string_functions.cpp
string_pool.cpp
stringptr.cpp
target.cpp
textbubble.cpp
value_functions.cpp
variable.cpp
test
scriptbuilder.cpp
project.cpp
rect.cpp
scratchconfiguration.cpp
test_export.h