具有一些已知和一些未知属性名称的对象的 Typescript 接口
I have an object where all the keys are string, some of the values are string and the rest are objects in this form:
var object = {
"fixedKey1": "something1",
"fixedKey2": "something2",
"unknownKey1": { 'param1': [1,2,3], 'param2': "some2", 'param3': 'some3'},
"unknownKey2": { 'param1': [1,2,3], 'param2': "some2", 'param3': 'some3'},
"unknownKey3": { 'param1': [1,2,3], 'param2': "some2", 'param3': 'some3'},
...
...
};
In this object fixedKey1 and fixedKey2 are the known keys which will be there in that object. unknownKey - value pair can vary from 1-n.
I tried defining the interface of the object as:
interface IfcObject {
[keys: string]: {
param1: number[];
param2: string;
param3: string;
}
}
But this throws the following error:
Variable of type number is not assignable of type object
Which I found out that it is not able to assign this interface to "fixedKey - value" pair.
So, how can I do the type checking of this kind of variables?
It's not exactly what you want, but you can use a union type:
interface IfcObject {
fixedKey1: string
fixedKey2: string
[key: string]: string | {
param1: number[];
param2: string;
param3: string;
}
}
It covers your case. But the unknown properties could be of type string.
export interface IfcObjectValues {
param1: number[];
param2: string;
param3: string;
}
interface MyInterface {
fixedKey1: string,
fixedKey2: number,
[x: string]: IfcObjectValues,
}
Your code in action, see here.
As @Paleo explained, you can use union property to define an interface for your corresponding object.
I would say you should define an interface for object values and then you should define your original object.
Sample interface can be:
export interface IfcObjectValues {
param1: number[];
param2: string;
param3: string;
}
export interface IfcMainObject {
[key : string]: string | IfcObjectValues;
}
anyunknown