BetaParameters
- key:
| "url"
| "bsd"
| "cmsdd"
| "cmsds"
| "rc"
| "smrt"
| "ttfbb"
| "ttlb"
| "e"
| (keyof Cmcd)
| "ab"
| "tbl"
| "cdn"
| "ltc"
| "bg"
| "sta"
| "pb"
| "ts"
| "tpb"
| "lb"
| "tab"
| "lab"
| "pt"
| "ec"
| "msd"
| "sn"
| "df"
| "cs"
| "ttfb"
Returns boolean
true if the key is a custom key, false otherwise.
Check if a key is a custom key.