I issued the command:
codeql database create ./databases/Pixi --language="javascript" --source-root="Pixi"
And got the following errors:
Initializing database at /sda8/codeql-2.11.1/program/databases/Pixi. A fatal error occurred: There's no CodeQL extractor named 'javascript' installed.
codeql version is 2.11.1.