tests/cases/compiler/arrayCast.ts(3,1): error TS2352: Neither type '{ foo: string; }[]' nor type '{ id: number; }[]' is assignable to the other. Type '{ foo: string; }' is not assignable to type '{ id: number; }'. Property 'id' is missing in type '{ foo: string; }'. ==== tests/cases/compiler/arrayCast.ts (1 errors) ==== // Should fail. Even though the array is contextually typed with { id: number }[], it still // has type { foo: string }[], which is not assignable to { id: number }[]. <{ id: number; }[]>[{ foo: "s" }]; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ !!! error TS2352: Neither type '{ foo: string; }[]' nor type '{ id: number; }[]' is assignable to the other. !!! error TS2352: Type '{ foo: string; }' is not assignable to type '{ id: number; }'. !!! error TS2352: Property 'id' is missing in type '{ foo: string; }'. // Should succeed, as the {} element causes the type of the array to be {}[] <{ id: number; }[]>[{ foo: "s" }, {}];