Consider the code snippet below:
private getJsonBody(body: {}|FormData) {
return !(body instanceof FormData) ? JSON.stringify(body) : body;
}
What is the significance of the curly braces enclosing a type declaration in the parameter? I encountered issues compiling it in my current setup and had to switch it to any for it to function.
Describing an Empty Object Type.
This type represents an object with no members of its own. TypeScript will throw a compile-time error if you attempt to access arbitrary properties on such an object:
// Type {}
const obj = {};
// Error: Property 'prop' does not exist on type '{}'.
obj.prop = "value";
Despite this limitation, you can still utilize all properties and methods defined on the Object type, which are accessible via JavaScript's prototype chain:
// Type {}
const obj = {};
// "[object Object]"
obj.toString();
An insightful read on Basarat's Lazy Object Initialization, explaining how Typescript handles this scenario and offering solutions.
To adjust your code accordingly, follow this example:
interface Foo {
bar: string;
baz: number;
}
private getJsonBody(body: {} as Foo | FormData) {
return !(body instanceof FormData)
? JSON.stringify(body)
: body;
}
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