Creating an Object implementing a Typescript Interface -


i'm providing public interface data, performance , memory reasons want use object , not class. there's no code on interface, purely data structure.

i want able declare object using interface if change interface it'll show error , doesn't missed.

interface datastructure {    key1: string;    key2: number;    key3: boolean;    key4: null; }  const defaultdata: {[key: string]: propertydescriptor} = {    key1: {writable: true, enumerable: true},    key2: {writable: true, enumerable: true},    key3: {writable: true, enumerable: true} };  var mydata = object.create(null, defaultdata);

i want report error missing key4 in defaultdata object, can't quite figure out how right now.

(this needed due potentially tens of thousands of objects needing same structure, , not wanting waste gc on them when it's easier re-use them - wanting map stores, no need object prototype chain.)

i think you're looking for:

const defaultdata: {[k in keyof datastructure]: propertydescriptor} = {     ... }

the compiler compile saying:

type '{ key1: { writable: true; enumerable: true; }; key2: { writable: true; enumerable: true; }; key3:...' not assignable type '{ key1: propertydescriptor; key2: propertydescriptor; key3: propertydescriptor; key4: propertydes...'.

property 'key4' missing in type '{ key1: { writable: true; enumerable: true; }; key2: { writable: true; enumerable: true; }; key3:...'.


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