I am encountering a TypeScript error in the code snippet below, even though I specified it as Record<"abc", string>?
interface IFoo {
key ?:
| string
| Record<"abc", string>
| boolean
| string[]
}
const test: IFoo = {key: {abc: "Hi"}}
console.log(test?.key?.abc);
The error message states: Property 'abc' does not exist on type 'string | Record<"abc", string>'.
Property 'abc' does not exist on type 'string'.
Considering that the value of test?.key may not always be of type Record<"abc", string>, it is not safe to directly access the property abc.
An alternative approach would be to utilize type coercion or type guards like so:
const key = test?.key;
if (isAbcRecord(key)) console.log(key.abc);
function isAbcRecord(v: unknown): v is Record<"abc", string> {
return v && typeof v === "object" && !Array.isArray(v); // this should suffice
}
If I were to choose, I'd opt for constrained generics:
interface IData <T extends string
| Record<"def", string>
| boolean
| string[]>{
value ?:T
}
const example: IData<Record<"def",string>> = {value: {def: "Hello"}}
console.log(example?.value?.def);
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