Function schemaTypeToCSharp

scripts/codegen/csharp.ts:337–405

(schema: JSONSchema7, required: boolean, knownTypes: Map<string, string>, propName?: string)

}

function schemaTypeToCSharp(schema: JSONSchema7, required: boolean, knownTypes: Map<string, string>, propName?: string): string {
    if (isOpaqueJson(schema)) {
        return required ? "JsonElement" : "JsonElement?";
    }
    const nullableInner = getNullableInner(schema);
    if (nullableInner) {
        // Pass required=true to get the base type, then add "?" for nullable
        return schemaTypeToCSharp(nullableInner, true, knownTypes, propName) + "?";
    }
    if (schema.$ref) {
        const refName = schema.$ref.split("/").pop()!;
        return knownTypes.get(refName) || refName;
    }
    // Titled union schemas (anyOf with a title) — use the title if it's a known generated type
    if (schema.title && schema.anyOf && knownTypes.has(schema.title)) {
        return required ? schema.title : `${schema.title}?`;
    }
    const type = schema.type;
    const format = schema.format;
    // Handle type: ["string", "null"] patterns (nullable string)
    if (Array.isArray(type)) {
        const nonNullTypes = type.filter((t) => t !== "null");
        if (nonNullTypes.length === 1 && nonNullTypes[0] === "string") {
            if (format === "uuid") return "Guid?";
            if (format === "date-time") return "DateTimeOffset?";
            return "string?";
        }
        if (nonNullTypes.length === 1 && (nonNullTypes[0] === "number" || nonNullTypes[0] === "integer")) {
            if (format === "duration" && !isSecondsDurationPropertyName(propName)) {
                return "TimeSpan?";
            }
            if (nonNullTypes[0] === "integer") {
                const integerType = isIntegerSchemaBoundedToInt32(schema) ? "int" : "long";
                return `${integerType}?`;
            }
            return "double?";
        }
    }
    if (type === "string") {
        if (format === "uuid") return required ? "Guid" : "Guid?";
        if (format === "date-time") return required ? "DateTimeOffset" : "DateTimeOffset?";
        return required ? "string" : "string?";
    }
    if (type === "number" || type === "integer") {
        if (format === "duration" && !isSecondsDurationPropertyName(propName)) {
            return required ? "TimeSpan" : "TimeSpan?";
        }
        if (type === "integer") {
            const integerType = isIntegerSchemaBoundedToInt32(schema) ? "int" : "long";
            return required ? integerType : `${integerType}?`;
        }
        return required ? "double" : "double?";
    }
    if (type === "boolean") return required ? "bool" : "bool?";
    if (type === "array") {
        const items = schema.items as JSONSchema7 | undefined;
        if (!items) failUnmappable(`array without items (propName=${propName ?? "?"})`, schema);
        const itemType = schemaTypeToCSharp(items, true, knownTypes);