Vue source code?: what is it

vue source code see?: what does this mean? why can it be written this way?
Vue.prototype._init = function (options?: Object) {

....

}
?: how does he parse it here

Aug.03,2021

flow, type system, type information is removed after compilation

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b308d6-2b49e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b308d6-2b49e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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