What this is

When generated code and the type checker disagree, the fastest way to green is to silence the checker. as any, as unknown as T, // @ts-ignore, strict: false. Each one is the same trade: the error moves from this line, where the context still exists, to a runtime stack trace weeks later, where it does not.

Why it matters

any is contagious: everything reached through an any value is unchecked, and everything assigned from those is too. One cast quietly switches off the checker for a whole call chain.

The double cast is the stronger spelling of the same thing. as unknown as User accepts literally any value; if the shapes really overlapped, one assertion would have compiled.

Directives are debt without a ledger when they carry no reason. @ts-expect-error at least expires: the day the underlying error is fixed, the directive itself errors and asks to be deleted. @ts-ignore never does.

What the probe does not do

Anything that needs the checker itself: implicit anys, wrong narrowing, generic constraints. PreFlight reads source, not types; run tsc --noEmit for the reviewer this page is about.