rhai/doc/src/safety/max-modules.md

Maximum Number of Modules

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Rhai by default does not limit how many [modules] can be loaded via [import] statements.

This can be changed via the Engine::set_max_modules method. Notice that setting the maximum number of modules to zero does not indicate unlimited modules, but disallows loading any module altogether.

A script attempting to load more than the maximum number of modules will terminate with an error result.

This limit can also be used to stop import-loops (i.e. cycles of modules referring to each other).

This check can be disabled via the [unchecked] feature for higher performance (but higher risks as well).

let mut engine = Engine::new();

engine.set_max_modules(5);      // allow loading only up to 5 modules

engine.set_max_modules(0);      // disallow loading any module (maximum = zero)

engine.set_max_modules(1000);   // set to a large number for effectively unlimited modules