@message-queue-toolkit/core/dist/queues/MessageSchemaContainer.js

Useful utilities, interfaces and base classes for message queue handling. Supports AMQP and SQS with a common abstraction on top currently

const DEFAULT_SCHEMA_KEY = Symbol('NO_MESSAGE_TYPE');
export class MessageSchemaContainer {
    messageDefinitions;
    messageSchemas;
    messageTypeField;
    constructor(options) {
        this.messageTypeField = options.messageTypeField;
        this.messageSchemas = this.resolveMap(options.messageSchemas);
        this.messageDefinitions = this.resolveMap(options.messageDefinitions ?? []);
    }
    resolveSchema(
    // biome-ignore lint/suspicious/noExplicitAny: This is expected
    message) {
        const messageType = this.messageTypeField ? message[this.messageTypeField] : undefined;
        const schema = this.messageSchemas[messageType ?? DEFAULT_SCHEMA_KEY];
        if (!schema) {
            return {
                error: new Error(`Unsupported message type: ${messageType ?? DEFAULT_SCHEMA_KEY.toString()}`),
            };
        }
        return { result: schema };
    }
    resolveMap(array) {
        const result = {};
        for (const item of array) {
            let type;
            if (this.messageTypeField) {
                type =
                    'publisherSchema' in item
                        ? // @ts-expect-error
                            item.publisherSchema?.shape[this.messageTypeField]?.value
                        : // @ts-expect-error
                            item.shape?.[this.messageTypeField]?.value;
            }
            const key = type ?? DEFAULT_SCHEMA_KEY;
            if (result[key])
                throw new Error(`Duplicate schema for type: ${key.toString()}`);
            result[key] = item;
        }
        return result;
    }
}
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