assemblyscript/tests/compiler/external.ts

export declare function foo(): void; // external.foo
export declare namespace foo {
  export function bar(): void; // foo.bar
}

@external("bar")
export declare function two(): void; // external.bar

@external("foo", "baz")
export declare function three(): void; // foo.baz

@external("foo", "var")
export declare const var_: i32;