better-auth/examples/nuxt-example/components/ui/auto-form/utils.ts

import type { z } from "zod";

// TODO: This should support recursive ZodEffects but TypeScript doesn't allow circular type definitions.
export type ZodObjectOrWrapped =
	| z.ZodObject<any, any>
	| z.ZodEffects<z.ZodObject<any, any>>;

/**
 * Beautify a camelCase string.
 * e.g. "myString" -> "My String"
 */
export function beautifyObjectName(string: string) {
	// Remove bracketed indices
	// if numbers only return the string
	let output = string.replace(/\[\d+\]/g, "").replace(/([A-Z])/g, " $1");
	output = output.charAt(0).toUpperCase() + output.slice(1);
	return output;
}

/**
 * Parse string and extract the index
 * @param string
 * @returns index or undefined
 */
export function getIndexIfArray(string: string) {
	const indexRegex = /\[(\d+)\]/;
	// Match the index
	const match = string.match(indexRegex);
	// Extract the index (number)
	const index = match ? Number.parseInt(match[1]) : undefined;
	return index;
}

/**
 * Get the lowest level Zod type.
 * This will unpack optionals, refinements, etc.
 */
export function getBaseSchema<
	ChildType extends z.ZodAny | z.AnyZodObject = z.ZodAny,
>(schema: ChildType | z.ZodEffects<ChildType>): ChildType | null {
	if (!schema) return null;
	if ("innerType" in schema._def)
		return getBaseSchema(schema._def.innerType as ChildType);

	if ("schema" in schema._def)
		return getBaseSchema(schema._def.schema as ChildType);

	return schema as ChildType;
}

/**
 * Get the type name of the lowest level Zod type.
 * This will unpack optionals, refinements, etc.
 */
export function getBaseType(schema: z.ZodAny) {
	const baseSchema = getBaseSchema(schema);
	return baseSchema ? baseSchema._def.typeName : "";
}

/**
 * Search for a "ZodDefault" in the Zod stack and return its value.
 */
export function getDefaultValueInZodStack(schema: z.ZodAny): any {
	const typedSchema = schema as unknown as z.ZodDefault<
		z.ZodNumber | z.ZodString
	>;

	if (typedSchema._def.typeName === "ZodDefault")
		return typedSchema._def.defaultValue();

	if ("innerType" in typedSchema._def) {
		return getDefaultValueInZodStack(
			typedSchema._def.innerType as unknown as z.ZodAny,
		);
	}
	if ("schema" in typedSchema._def) {
		return getDefaultValueInZodStack(
			(typedSchema._def as any).schema as z.ZodAny,
		);
	}

	return undefined;
}

export function getObjectFormSchema(
	schema: ZodObjectOrWrapped,
): z.ZodObject<any, any> {
	if (schema?._def.typeName === "ZodEffects") {
		const typedSchema = schema as z.ZodEffects<z.ZodObject<any, any>>;
		return getObjectFormSchema(typedSchema._def.schema);
	}
	return schema as z.ZodObject<any, any>;
}

function isIndex(value: unknown): value is number {
	return Number(value) >= 0;
}
/**
 * Constructs a path with dot paths for arrays to use brackets to be compatible with vee-validate path syntax
 */
export function normalizeFormPath(path: string): string {
	const pathArr = path.split(".");
	if (!pathArr.length) return "";

	let fullPath = String(pathArr[0]);
	for (let i = 1; i < pathArr.length; i++) {
		if (isIndex(pathArr[i])) {
			fullPath += `[${pathArr[i]}]`;
			continue;
		}

		fullPath += `.${pathArr[i]}`;
	}

	return fullPath;
}

type NestedRecord = Record<string, unknown> | { [k: string]: NestedRecord };
/**
 * Checks if the path opted out of nested fields using `[fieldName]` syntax
 */
export function isNotNestedPath(path: string) {
	return /^\[.+\]$/.test(path);
}
function isObject(obj: unknown): obj is Record<string, unknown> {
	return (
		obj !== null && !!obj && typeof obj === "object" && !Array.isArray(obj)
	);
}
function isContainerValue(value: unknown): value is Record<string, unknown> {
	return isObject(value) || Array.isArray(value);
}
function cleanupNonNestedPath(path: string) {
	if (isNotNestedPath(path)) return path.replace(/\[|\]/g, "");

	return path;
}

/**
 * Gets a nested property value from an object
 */
export function getFromPath<TValue = unknown>(
	object: NestedRecord | undefined,
	path: string,
): TValue | undefined;
export function getFromPath<TValue = unknown, TFallback = TValue>(
	object: NestedRecord | undefined,
	path: string,
	fallback?: TFallback,
): TValue | TFallback;
export function getFromPath<TValue = unknown, TFallback = TValue>(
	object: NestedRecord | undefined,
	path: string,
	fallback?: TFallback,
): TValue | TFallback | undefined {
	if (!object) return fallback;

	if (isNotNestedPath(path))
		return object[cleanupNonNestedPath(path)] as TValue | undefined;

	const resolvedValue = (path || "")
		.split(/\.|\[(\d+)\]/)
		.filter(Boolean)
		.reduce((acc, propKey) => {
			if (isContainerValue(acc) && propKey in acc) return acc[propKey];

			return fallback;
		}, object as unknown);

	return resolvedValue as TValue | undefined;
}