Dockerfile's getAvailableVariables(number) returns variables that are outside the build stage at the given line

[rcjsuen]

import { DockerfileParser } from 'dockerfile-ast';

const content =
`FROM alpine
ARG var=8000
FROM alpine`

let dockerfile = DockerfileParser.parse(content);
console.log(dockerfile.getAvailableVariables(2).length);

With the code above, 1 will be returned instead of 0. It shouldn't be finding the var variable defined on the second line.

[rcjsuen]

Fixed by 54bf5c3. I wrote the wrong issue number in the commit message. :(