Function getNullableInner

scripts/codegen/utils.ts:420–426

(schema: JSONSchema7)

 * Returns undefined if the schema is not a nullable wrapper.
 */
export function getNullableInner(schema: JSONSchema7): JSONSchema7 | undefined {
    if (!schema.anyOf || !Array.isArray(schema.anyOf) || schema.anyOf.length !== 2) return undefined;
    const [a, b] = schema.anyOf;
    if (isNullLike(a) && !isNullLike(b)) return b as JSONSchema7;
    if (isNullLike(b) && !isNullLike(a)) return a as JSONSchema7;
    return undefined;
}

function isNullLike(s: unknown): boolean {
    if (!s || typeof s !== "object") return false;