TypeScript/tests/baselines/reference/expandoOnAlias.types at a928f4c0ec990922e1a6927374c63636638704b8 · andrewbranch/TypeScript · GitHub

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=== tests/cases/conformance/salsa/vue.js ===
export class Vue {}
>Vue : Vue

export const config = { x: 0 };
>config : { x: number; }
>{ x: 0 } : { x: number; }
>x : number
>0 : 0

=== tests/cases/conformance/salsa/test.js ===
import { Vue, config } from "./vue";
>Vue : typeof Vue
>config : { x: number; }

// Expando declarations aren't allowed on aliases.
Vue.config = {};
>Vue.config = {} : {}
>Vue.config : any
>Vue : typeof Vue
>config : any
>{} : {}

new Vue();
>new Vue() : Vue
>Vue : typeof Vue

// This is not an expando declaration; it's just a plain property assignment.
config.x = 1;
>config.x = 1 : 1
>config.x : number
>config : { x: number; }
>x : number
>1 : 1

// This is not an expando declaration; it works because non-strict JS allows
// loosey goosey assignment on objects.
config.y = {};
>config.y = {} : {}
>config.y : any
>config : { x: number; }
>y : any
>{} : {}

config.x;
>config.x : number
>config : { x: number; }
>x : number

config.y;
>config.y : any
>config : { x: number; }
>y : any