[adrian-niculescu]

In a device spec, expect.any(Number), expect.objectContaining({ ... }) and expect.extend({ ... }) throw TypeError: ... is not a function, although plain expect(value).toBe(...) works.

Device builds alias vitest to dist/runtime/shim.js, and the shim exported expect as an arrow function that forwarded each call to the device expect. Calls went through, but none of the properties setupNativeScriptExpect puts on the device expect did: the asymmetric matchers, expect.not, extend, getState and setState. The shim now exports a Proxy that forwards property reads, writes, definitions, deletions and key listing to the device expect, and refuses to be frozen, sealed or given another prototype. It still resolves the device expect on first use rather than on import, because setting it up replaces the global expect, and host tests that import from the shim (as runner.spec.ts does) would otherwise lose expect.assertions and expect.hasAssertions checks.

shim.spec.ts fails without this change, and shim-import.spec.ts fails if the shim sets up the device expect on import. I also ran a spec using these helpers through the shim on an Android 17 emulator and an iOS 26.5 simulator.

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