I'm attempting to define a const with this particular structure:
type Item = null | {parent: keyof typeof SYSTEM};
const SYSTEM = {
'x': null,
'y': {parent: 'x'},
} meets the criteria of Record<string, Item>;
This is causing issues due to the circular reference. How can I work around this while maintaining the same functionality, ensuring that TS will allow me to add new nodes to SYSTEM and still verify that each parent exists in the system?
Break down the process of declaring and checking TREE to avoid circular dependencies. First, declare the elements:
type Element = null | { parent: keyof typeof TREE };
const TREE = {
'a': null,
'b': { parent: 'a' },
} as const;
Then proceed with the check:
const check: Record<string, Element> = TREE; // successful
This separation eliminates the circular nature as the type of TREE solely depends on its initializer. If you were using the satisfies operator to maintain literal types for parent properties in TREE, consider using a const assertion instead.
The check
const check: Record<string, Element> = TREEElement properties in TREE will result in an error:
const TREE = {
'a': null,
'b': { parent: 'c' }, // <-- 'c'
} as const;
const check: Record<string, Element> = TREE; // error!
// ~~~~~
// Type '"c"' is not assignable to type '"a" | "b"'.
Though the error location may not be ideal, it clarifies the issue at hand.
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