API Reference
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    CustomMessageTriggerSchema: ZodObject<
        {
            callerContext: ZodObject<
                { awsSdkVersion: ZodString; clientId: ZodString },
                "strip",
                ZodTypeAny,
                { awsSdkVersion: string; clientId: string },
                { awsSdkVersion: string; clientId: string },
            >;
            region: ZodString;
            triggerSource: ZodString;
            userName: ZodOptional<ZodString>;
            userPoolId: ZodString;
            version: ZodString;
        } & {
            request: ZodObject<
                {
                    clientMetadata: ZodOptional<ZodRecord<ZodString, ZodString>>;
                    codeParameter: ZodString;
                    linkParameter: ZodNullable<ZodString>;
                    userAttributes: ZodRecord<ZodString, ZodString>;
                    usernameParameter: ZodNullable<ZodString>;
                },
                "strip",
                ZodTypeAny,
                {
                    clientMetadata?: Record<string, string>;
                    codeParameter: string;
                    linkParameter: null | string;
                    userAttributes: Record<string, string>;
                    usernameParameter: null | string;
                },
                {
                    clientMetadata?: Record<string, string>;
                    codeParameter: string;
                    linkParameter: null | string;
                    userAttributes: Record<string, string>;
                    usernameParameter: null | string;
                },
            >;
            response: ZodObject<
                {
                    emailMessage: ZodNullable<ZodString>;
                    emailSubject: ZodNullable<ZodString>;
                    smsMessage: ZodNullable<ZodString>;
                },
                "strip",
                ZodTypeAny,
                {
                    emailMessage: null
                    | string;
                    emailSubject: null | string;
                    smsMessage: null | string;
                },
                {
                    emailMessage: null
                    | string;
                    emailSubject: null | string;
                    smsMessage: null | string;
                },
            >;
        },
        "strip",
        ZodTypeAny,
        {
            callerContext: { awsSdkVersion: string; clientId: string };
            region: string;
            request: {
                clientMetadata?: Record<string, string>;
                codeParameter: string;
                linkParameter: null | string;
                userAttributes: Record<string, string>;
                usernameParameter: null | string;
            };
            response: {
                emailMessage: null
                | string;
                emailSubject: null | string;
                smsMessage: null | string;
            };
            triggerSource: string;
            userName?: string;
            userPoolId: string;
            version: string;
        },
        {
            callerContext: { awsSdkVersion: string; clientId: string };
            region: string;
            request: {
                clientMetadata?: Record<string, string>;
                codeParameter: string;
                linkParameter: null | string;
                userAttributes: Record<string, string>;
                usernameParameter: null | string;
            };
            response: {
                emailMessage: null
                | string;
                emailSubject: null | string;
                smsMessage: null | string;
            };
            triggerSource: string;
            userName?: string;
            userPoolId: string;
            version: string;
        },
    > = ...

    A zod schema for a Cognito Custom Message trigger event.

    {
    "version": "1",
    "triggerSource": "CustomMessage_SignUp",
    "region": "us-east-1",
    "userPoolId": "us-east-1_ABC123",
    "userName": "johndoe",
    "callerContext": {
    "awsSdkVersion": "2.814.0",
    "clientId": "client123"
    },
    "request": {
    "userAttributes": {
    "email": "user@example.com",
    "name": "John Doe"
    },
    "codeParameter": "{####}",
    "usernameParameter": "string",
    "linkParameter": "string",
    "usernameParameter": null
    },
    "response": {
    "smsMessage": null,
    "emailMessage": null,
    "emailSubject": null,
    }
    }