I would like to explicitly invoke the JavaScript autobuilder as part of codeql database create, with the ultimate goal of passing it some custom options. However, even invoking it without any options isn't as easy as I would have hoped, since I cannot figure out how to access CodeQL environment variables to specify the path to the autobuilder.

My first attempt of

codeql database create -l javascript --command '${CODEQL_EXTRACTOR_JAVASCRIPT_ROOT}/tools/autobuild.sh /path/to/database

was met with

A fatal error occurred: Failed to expand '${CODEQL_EXTRACTOR_JAVASCRIPT_ROOT}/tools/autobuild.sh' as an argument list.
(eventual cause: UserError "Attempting to expand unknown variable: CODEQL_EXTRACTOR_JAVASCRIPT_ROOT, available variables are: []")

@lcartey suggested adding env. like so:

codeql database create -l javascript --command '${env.CODEQL_EXTRACTOR_JAVASCRIPT_ROOT}/tools/autobuild.sh' /path/to/database

but that resulted in

A fatal error occurred: Failed to expand '${env.CODEQL_EXTRACTOR_JAVASCRIPT_ROOT}/tools/autobuild.sh' as an argument list.
(eventual cause: UserError "Attempting to expand unknown variable: env.CODEQL_EXTRACTOR_JAVASCRIPT_ROOT, ava...")

I am pretty sure this is the right environment variable name, cf. here.

Specifying the full path to the autobuild script is, of course, possible, but annoying.