Per-app layers

Bindings that only fire while a given app is frontmost.

Some bindings only make sense in one app. You can scope a whole layer to it, or a single binding.

In karabiner.ts

withCondition(ifApp(apps.chrome.bundleId))([
  // …mappings that only apply in Chrome
])

A layer for one app

In the sidebar, + → App makes a group whose bindings only fire in that app. Groups nested under it inherit the condition: here Reading, under Chrome, only applies in Chrome.

Modes don’t inherit it. A mode’s keys work wherever it was entered, so scope the binding that enters it instead. In Get started, f in the Chrome group enters Nav, so Nav can only start in Chrome.

One binding for one app

A binding’s Only when takes the same App condition. In the Leader mode, a sends ⌘L only while Chrome is frontmost, and does nothing elsewhere.

An App condition can list several apps, as ifApp([...]) does, and matches any of them.