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ConditionMap type

Declaration-ordered condition map (expressions.md §8). Each key is an Expression (§2 grammar); keys are evaluated top-to-bottom and the value of the first truthy key is returned. If none match, the value of the true key (the always-true default) is used; if absent, null. The default key is always literal true — convention symbols such as _ are forbidden (R4).

The condition map is a thin wrapper that calls the engine repeatedly; it is not a separate parser.

Signature:

export type ConditionMap<V = unknown> = {
    true?: V;
    [expression: string]: V | undefined;
};