This mean that the AST (Abstract Syntax Tree) analysis of one of the JavaScript code of the package has failed because the code was to complicated. For example if your package contains a .js file with the following content:
Then the AST analysis will return fs, path and ./lib as required dependencies. The code will not be considered suspicious ! But if we take a malicious code:
This code require the core package http but the AST analysis is not capable to get it (not yet 😁). So the code will be flagged as "suspect".