Bug#1012171: node-loose-envify: broken with current node-js-tokens

[Yadd]

Package: node-loose-envify
Version: 1.4.0+dfsg1-2
Severity: serious
Tags: ftbfs
Justification: FTBFS
Control: affects -1 node-prop-types

node-loose-envify is built to use js-tokens 4. It needs to be fixed for
js-token >= 6