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type FormValidator,
validationFailure,
type ValidationFieldErrors,
validationSuccess,
} from "./types";
const ROOT_FIELD = "root";
const RHF_ERROR_TYPE = "manual";
const DEFAULT_EFFECT_ERROR_MESSAGE = "Schema validation failed";
type PathSegment = string | number;
export interface SchemaIssueInput {
path?: ReadonlyArray<PathSegment>;
message?: unknown;
}
interface NormalizedIssue {
path: ReadonlyArray<PathSegment>;
message: string;
}
const toFieldPath = (path: ReadonlyArray<PathSegment>): string =>
path.length > 0
? path.map((segment) => String(segment)).join(".")
: ROOT_FIELD;
const toIssueMessage = (value: unknown, fallback: string): string => {
Eif (typeof value === "string" && value.trim().length > 0) {
return value;
}
return fallback;
};
const normalizeIssue = (
issue: SchemaIssueInput,
fallbackMessage: string,
): NormalizedIssue => ({
path: Array.isArray(issue.path) ? issue.path : [],
message: toIssueMessage(issue.message, fallbackMessage),
});
const toErrorMessage = (error: unknown, fallbackMessage: string): string => {
if (error instanceof Error && error.message.trim().length > 0) {
return error.message;
}
Iif (typeof error === "string" && error.trim().length > 0) {
return error;
}
return fallbackMessage;
};
const mapIssuesToFieldErrors = <T extends object>(
issues: ReadonlyArray<NormalizedIssue>,
fallbackMessage: string,
): ValidationFieldErrors<T> => {
const fieldErrors: ValidationFieldErrors<T> = {};
if (issues.length === 0) {
fieldErrors.root = fallbackMessage;
return fieldErrors;
}
for (const issue of issues) {
const fieldPath = toFieldPath(issue.path) as keyof ValidationFieldErrors<T>;
Eif (!fieldErrors[fieldPath]) {
fieldErrors[fieldPath] = issue.message;
}
}
return fieldErrors;
};
export interface EffectSchemaLike<T extends object> {
decodeUnknownSync: (input: unknown) => T;
}
export type EffectSchemaSource<T extends object> =
| EffectSchemaLike<T>
| ((input: unknown) => T);
interface EffectErrorLike {
issues?: ReadonlyArray<SchemaIssueInput>;
errors?: ReadonlyArray<SchemaIssueInput>;
}
const getEffectDecoder = <T extends object>(
schema: EffectSchemaSource<T>,
): ((input: unknown) => T) =>
typeof schema === "function" ? schema : schema.decodeUnknownSync;
const defaultEffectIssueExtractor = (
error: unknown,
): ReadonlyArray<SchemaIssueInput> => {
Iif (!error || typeof error !== "object") {
return [];
}
const effectError = error as EffectErrorLike;
if (Array.isArray(effectError.issues)) {
return effectError.issues;
}
Iif (Array.isArray(effectError.errors)) {
return effectError.errors;
}
return [];
};
export interface EffectSchemaAdapterOptions {
extractIssues?: (error: unknown) => ReadonlyArray<SchemaIssueInput>;
fallbackMessage?: string;
}
export const fromEffectSchema = <T extends object>(
schema: EffectSchemaSource<T>,
options: EffectSchemaAdapterOptions = {},
): FormValidator<T> => {
const decode = getEffectDecoder(schema);
const extractIssues = options.extractIssues ?? defaultEffectIssueExtractor;
const fallbackMessage =
options.fallbackMessage ?? DEFAULT_EFFECT_ERROR_MESSAGE;
return (data) => {
try {
decode(data);
return validationSuccess<T>();
} catch (error) {
const rawIssues = extractIssues(error);
const normalizedIssues = rawIssues.map((issue) =>
normalizeIssue(issue, fallbackMessage),
);
const errorMessage = toErrorMessage(error, fallbackMessage);
return validationFailure<T>(
mapIssuesToFieldErrors<T>(normalizedIssues, errorMessage),
);
}
};
};
const isEffectSchemaObject = <T extends object>(
schema: unknown,
): schema is EffectSchemaLike<T> =>
!!schema &&
typeof schema === "object" &&
"decodeUnknownSync" in schema &&
typeof (schema as { decodeUnknownSync?: unknown }).decodeUnknownSync ===
"function";
const isEffectSchema = <T extends object>(
schema: unknown,
): schema is EffectSchemaSource<T> =>
typeof schema === "function" || isEffectSchemaObject<T>(schema);
export type CreateSchemaValidatorOptions = EffectSchemaAdapterOptions;
/**
* Single adapter entrypoint.
* This layer currently supports Effect schema only.
*/
export const createSchemaValidator = <T extends object>(
schema: unknown,
options: CreateSchemaValidatorOptions = {},
): FormValidator<T> => {
if (!isEffectSchema<T>(schema)) {
throw new Error(
"createSchemaValidator expected an effect-like schema with decodeUnknownSync()",
);
}
return fromEffectSchema(schema, options);
};
interface ResolverFieldError {
type: string;
message: string;
}
export interface FormResolverResult<T extends object> {
values: T | Record<string, never>;
errors: Record<string, unknown>;
}
export type FormResolver<T extends object> = (
values: T,
) => FormResolverResult<T> | Promise<FormResolverResult<T>>;
const setNestedValue = (
target: Record<string, unknown>,
path: string,
value: ResolverFieldError,
): void => {
const segments = path.split(".").filter(Boolean);
Iif (segments.length === 0) {
target[ROOT_FIELD] = value;
return;
}
let cursor: Record<string, unknown> = target;
for (const [index, segment] of segments.entries()) {
const isLeaf = index === segments.length - 1;
if (isLeaf) {
cursor[segment] = value;
return;
}
const next = cursor[segment];
Eif (!next || typeof next !== "object") {
cursor[segment] = {};
}
cursor = cursor[segment] as Record<string, unknown>;
}
};
const toResolverErrors = <T extends object>(
fieldErrors: ValidationFieldErrors<T>,
): Record<string, unknown> => {
const errors: Record<string, unknown> = {};
for (const [field, message] of Object.entries(fieldErrors)) {
Iif (!message) {
continue;
}
setNestedValue(errors, field, {
type: RHF_ERROR_TYPE,
message,
});
}
return errors;
};
export const toFormResolver = <T extends object>(
validator: FormValidator<T>,
): FormResolver<T> => {
return async (values) => {
const validation = validator(values);
if (validation.isValid) {
return {
values,
errors: {},
};
}
return {
values: {},
errors: toResolverErrors(validation.fieldErrors),
};
};
};
export const toRHFResolver = toFormResolver;
export const toHookFormResolver = toFormResolver;
|