Destructuring nullable objects
You can use an empty object as fallback, and if D is null or undefined the assigned variables will be undefined.
const D = null;const { a, b, c } = D || {};console.log(a, b, c);Using typescript you need to add the correct type (or any) to the FALLBACK object (TS playground). For example:
interface Obj { a?: string; b?: string; c?: string;}const D = null;const { a, b, c } = D || {} as Obj;console.log(a, b, c);Another option is to use object spread, since spreading null or undefined results in an empty object (see this SO answer).
const D = null;const { a, b, c } = { ...D };console.log(a, b, c);Using typescript you need to add the types to the variable that you spread, and the object that you destructure. For example (TS Playground):
interface Obj { a?: string; b?: string; c?: string;}const D = null;const { a, b, c } = { ...D as any } as Obj;console.log(a, b, c);If you need to handle nested destructuring, use defaults:
const D = null;const { a, a: { z } = {}, b, c } = { ...D };console.log(a, b, c, z);