fortify-schema/dist/esm/core/schema/extensions/components/ConditionalValidation/ConditionalBuilder.js

A modern TypeScript validation library designed around familiar interface syntax and powerful conditional validation. Experience schema validation that feels natural to TypeScript developers while unlocking advanced runtime validation capabilities.

import { ConditionalThen } from './ConditionalThen.js';

/**
 * Builder for single field conditional validation with TypeScript inference
 */
class ConditionalBuilder {
    constructor(fieldName) {
        this.fieldName = fieldName;
        this.conditions = [];
        this.defaultSchema = null;
    }
    /**
     * Check if field equals specific value
     */
    is(value) {
        return new ConditionalThen(this, (fieldValue) => fieldValue === value);
    }
    /**
     * Check if field does not equal specific value
     */
    isNot(value) {
        return new ConditionalThen(this, (fieldValue) => fieldValue !== value);
    }
    /**
     * Check if field exists (not null/undefined)
     */
    exists() {
        return new ConditionalThen(this, (fieldValue) => fieldValue != null);
    }
    /**
     * Check if field matches pattern
     */
    matches(pattern) {
        return new ConditionalThen(this, (fieldValue) => typeof fieldValue === "string" && pattern.test(fieldValue));
    }
    /**
     * Check if field is in array of values
     */
    in(values) {
        return new ConditionalThen(this, (fieldValue) => values.includes(fieldValue));
    }
    /**
     * Custom condition function
     */
    when(condition) {
        return new ConditionalThen(this, condition);
    }
    addCondition(condition, schema) {
        this.conditions.push({ condition, schema });
        return this;
    }
    default(schema) {
        this.defaultSchema = schema;
        return this.build();
    }
    build() {
        // Return a special object that the validation engine can recognize
        return {
            __conditional: true,
            fieldName: this.fieldName,
            conditions: this.conditions,
            default: this.defaultSchema
        };
    }
}

export { ConditionalBuilder };
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