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Here is my (hypothetical, not actually implemented) simplified use case: in my game, when you click a button, all my physical entities explode, which results in their positions being modified.
To achieve this, I create an entity whenever I receive the event of the click of the button, with a component that marks that all entities should explode.
I have a system that reacts to this entity. When it's present, it creates an ExplosionSystem which is responsible for updating the physical entities' positions. If it's not present, and the system is known by ECS, it removes it.

This approach has a few shortcomings:

1. the eligibility of components to the ExplosionSystem is lost when you remove it, which is bad for performance
2. the ExplosionSystem is not reusable, and is needlessly recreated
3. the ExplosionSystem can only be added after all the other systems

This is my example, but it can be generalized to any case where an event results into the update of multiple different components.

It seems to me that if you were able to do mySystem.disable() and mySystem.enable(), all those problems would disappear. It would just be a matter of setting a flag on the disabled systems and checking that it's not present when updating the systems.

It's my first time using ECS, so maybe there is a better approach. I heard about it in this video about Entitas.

I'm looking at some recent small bug fixes on the original codebase and wondering the issues fixed also affect this fork?

See:
behavior3/behavior3js#8

and others

Looks like a really nice lib.
Tiny typo in the example that drives me a bit insane.

I do believe that you mean
class KeyboardControlSystem extends ECS.System {
and not
class KeyboardControlSystem extends ECS.Sytem {

Sorry if it seems like I'm nitpicking, but I felt like I ought to let you guys know.

on npmjs.org, yagl-ecs 1.1.0 has been released. On github, the version is still 1.0.0, leaving the new version undocumented as the source is the only documentation. Please update the source on github.