No empty string items¶

noEmptyStringItems validates that an array does not contain any empty string ("") items.

It performs a strict structural array check and rejects any non‑array value. If the value is an array and contains at least one empty string, the rule emits a single validation event. Otherwise, it produces no validation output.

Signature¶

Through the API:

.noEmptyStrings();

And internally:

export const noEmptyStringItems: ValidationRule
(value: unknown, path: FieldPath) => Promise<ReadonlyArray<JaneEvent>>

Events¶

Event code	Description
`array.not.array`	Value is not structurally an array.
`array.has.empty-strings`	Array contains one or more empty string items.

Design rationale¶

Enforces strict, predictable validation that disallows empty string entries.
Rejects non‑array values with a structural‑type diagnostic.
Uses direct equality (item === "") for clarity and zero ambiguity.
Emits exactly one event per failure for clarity and composability.
Never coerces, normalizes, or transforms — validation is explicit and opt‑in.
Async‑compatible and returns a readonly array of JaneEvent objects.

Invoke¶

noEmptyStringItems runs only when explicitly included in a boundary or pipeline. It does not run automatically.

The rule activates when:

The value is any JavaScript value.
If the value is not an array, emits array.not.array.
If the value is an array and contains at least one empty string, emits array.has.empty-strings.
Otherwise, returns an empty result set.

Examples¶

Valid — no empty strings¶

await noEmptyStringItems(["a", "b", "c"], "$");
// → []

Invalid — contains empty string¶

await noEmptyStringItems(["a", "", "c"], "$");
// → [
//     JaneEvent{
//       kind: "error",
//       code: "array.has.empty-strings",
//       path: "$",
//       ...
//     }
//   ]

Non‑array value¶

await noEmptyStringItems("not-an-array", "$");
// → [
//     JaneEvent{
//       kind: "error",
//       code: "array.not.array",
//       path: "$",
//       ...
//     }
//   ]