fe-validate/message.models.d.ts

angular 2+ form validate

/**
 * Interface for creating validation messages
 */
export interface ErrorMessage {
    /**
     * The error key to look for on the FormControl.errors object
     */
    error: string;
    /**
     * The format string function to create the validation format to be displayed.
     * @param {string} label The text from the first <label> tag found within the .form-group
     * @param {*} error The value accessed from FormControl.errors[error] using ErrorMessage.error as the key
     */
    format?: (label?: string, error?: any) => string;
}