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declare global {

/**

* React reads this to decide whether `act` is supported. It is not one of the

* ambient globals, so it has to be declared before it can be assigned.

var IS_REACT_ACT_ENVIRONMENT: boolean

}

/**

* jest-dom only registers DOM matchers (`toHaveStyle`, `toHaveClass`, …), so it is

* dead weight outside a DOM environment. This package's mount tests opt into jsdom

* per file, so load it only when one is actually running — mirroring `apps/sim`.

if (typeof document !== 'undefined') {

await import('@testing-library/jest-dom/vitest')

* Without this React treats `act` as unsupported, and every render in the

* mount tests logs "The current testing environment is not configured to

* support act(...)" — around forty lines a run, which buries the output that

* matters when one of them fails.

globalThis.IS_REACT_ACT_ENVIRONMENT = true

}