earendil-works/pi · error · UnsupportedStrictJsonSchemaError

object and array unions are unsupported

Error message

object and array unions are unsupported

What it means

Error "object and array unions are unsupported" thrown in earendil-works/pi.

Source

Thrown at packages/ai/src/api/constrained-sampling.ts:69

}

function makeJsonSchemaNodeStrict(schema: unknown): void {
	if (!isJsonSchemaObject(schema)) {
		throw new UnsupportedStrictJsonSchemaError("boolean schemas are unsupported");
	}
	for (const key of UNSUPPORTED_STRICT_SCHEMA_KEYS) {
		if (schema[key] !== undefined) {
			throw new UnsupportedStrictJsonSchemaError(`${key} schemas are unsupported`);
		}
	}

	if (schema.anyOf !== undefined) {
		if (!Array.isArray(schema.anyOf) || schema.anyOf.length === 0) {
			throw new UnsupportedStrictJsonSchemaError("anyOf must contain at least one schema");
		}
		for (const variant of schema.anyOf) {
			if (isStructuredSchema(variant)) {
				throw new UnsupportedStrictJsonSchemaError("object and array unions are unsupported");
			}
			makeJsonSchemaNodeStrict(variant);
		}
	}

	if (schema.items !== undefined) {
		if (Array.isArray(schema.items)) {
			throw new UnsupportedStrictJsonSchemaError("tuple schemas are unsupported");
		}
		makeJsonSchemaNodeStrict(schema.items);
	}

	const isObjectSchema = schema.type === "object";
	if (schema.properties !== undefined && !isObjectSchema) {
		throw new UnsupportedStrictJsonSchemaError("properties require type object");
	}
	if (!isObjectSchema) return;
	if (schema.additionalProperties !== undefined && schema.additionalProperties !== false) {

View on GitHub (pinned to 4af9d21d3b)

Solutions

1. Flatten object/array unions into a single schema shape supported by constrained sampling.

When it happens

Trigger: Thrown at packages/ai/src/api/constrained-sampling.ts:69 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of earendil-works/pi@4af9d21d3b (2026-08-24). Data as JSON: /api/errors/c4db2db5314404f5. Report an issue: GitHub.