Enable isolatedDeclarations in tsconfig

.changeset/tangy-carpets-repeat.md

@@ -0,0 +1,5 @@
+---
+"conformal": patch
+---
+
+Enable isolatedDeclarations in tsconfig

AGENTS.md

@@ -38,7 +38,7 @@ Exports live in `src/index.ts`, `src/valibot/index.ts`, and `src/zod/index.ts`.
 - TypeScript strict mode (see `tsconfig.json` flags).
 - ESM-only, isomorphic runtime (no Node-only APIs).
 - Prettier formatting: `npm run format:write`.
-- Keep runtime deps minimal; `zod` is an optional peer dependency.
+- Keep runtime deps minimal; `valibot` is an optional peer dependency.
 
 ## Build & test
 

README.md

@@ -28,8 +28,9 @@ Here's a quick example showing how Conformal handles form validation with a user
 
 ```typescript
 import { parseFormData } from "conformal";
-import * as z from "zod"; // Tip: Use conformal's coerce functions for form input preprocessing
+import * as z from "zod";
 
+// Tip: Use conformal's coerce functions for form input preprocessing
 const schema = z.object({
   name: z.string().min(2, "Name must be at least 2 characters"),
   email: z.email("Invalid email address"),

package.json

@@ -43,7 +43,6 @@
   "devDependencies": {
     "@changesets/changelog-github": "^0.5.1",
     "@changesets/cli": "^2.29.7",
-    "@types/node": "^24.5.2",
     "prettier": "^3.6.2",
     "typescript": "^5.9.2",
     "valibot": "^1.1.0",

src/README.md

@@ -155,7 +155,7 @@ import { coerceBigint } from "conformal";
 console.log(coerceBigint("42")); // 42n
 console.log(coerceBigint("9007199254740991")); // 9007199254740991n
 console.log(coerceBigint("")); // undefined
-console.log(coerceNumber(" ")); // undefined
+console.log(coerceBigint(" ")); // undefined
 console.log(coerceBigint("abc")); // "abc" (unchanged)
 ```
 

src/submission.ts

@@ -25,7 +25,10 @@ export function toSubmission<Output>(
       };
 }
 
-export function getFormErrors(issues?: ReadonlyArray<StandardSchemaV1.Issue>) {
+export function getFormErrors(issues?: ReadonlyArray<StandardSchemaV1.Issue>): {
+  formErrors: string[];
+  fieldErrors: Record<string, string[]>;
+} {
   const formErrors: string[] = [];
   const fieldErrors: Record<string, string[]> = {};
 

src/valibot/README.md

@@ -8,6 +8,8 @@ The Valibot Utilities are provided under the `conformal/valibot` subpath. Valibo
 
 These coercion pipes handle the conversion from form input values to rich JS types. They convert empty strings to `undefined`, coerce string inputs to appropriate types (numbers, dates, booleans), and handle `File` objects. They're composable pipes that can be combined with any valibot validation schema using `v.pipe()`.
 
+For concrete reference of coercion rules, refer to the [Coerce Functions](../README.md#coerce-functions) documentation.
+
 ```typescript
 import * as vf from "conformal/valibot";
 import * as v from "valibot";

src/valibot/coerce.ts

@@ -13,7 +13,9 @@ export function coerceNumber(): v.SchemaWithPipe<
   return v.pipe(v.unknown(), v.transform(coerce.coerceNumber));
 }
 
-export function coerceBigint() {
+export function coerceBigint(): v.SchemaWithPipe<
+  readonly [v.UnknownSchema, v.TransformAction<unknown, unknown>]
+> {
   return v.pipe(v.unknown(), v.transform(coerce.coerceBigint));
 }
 

src/zod/schemas.ts

@@ -12,35 +12,45 @@ import {
 /**
  * @deprecated The Zod utilities will be removed in the next major release.
  */
-export function string(params?: Parameters<typeof z.string>[0]) {
+export function string(
+  params?: Parameters<typeof z.string>[0],
+): z.ZodPipe<z.ZodTransform<unknown, unknown>, z.ZodString> {
   return z.preprocess(coerceString, z.string(params));
 }
 
 /**
  * @deprecated The Zod utilities will be removed in the next major release.
  */
-export function number(params?: Parameters<typeof z.number>[0]) {
+export function number(
+  params?: Parameters<typeof z.number>[0],
+): z.ZodPipe<z.ZodTransform<unknown, unknown>, z.ZodNumber> {
   return z.preprocess(coerceNumber, z.number(params));
 }
 
 /**
  * @deprecated The Zod utilities will be removed in the next major release.
  */
-export function bigint(params?: Parameters<typeof z.bigint>[0]) {
+export function bigint(
+  params?: Parameters<typeof z.bigint>[0],
+): z.ZodPipe<z.ZodTransform<unknown, unknown>, z.ZodBigInt> {
   return z.preprocess(coerceBigint, z.bigint(params));
 }
 
 /**
  * @deprecated The Zod utilities will be removed in the next major release.
  */
-export function boolean(params?: Parameters<typeof z.boolean>[0]) {
+export function boolean(
+  params?: Parameters<typeof z.boolean>[0],
+): z.ZodPipe<z.ZodTransform<unknown, unknown>, z.ZodBoolean> {
   return z.preprocess(coerceBoolean, z.boolean(params));
 }
 
 /**
  * @deprecated The Zod utilities will be removed in the next major release.
  */
-export function date(params?: Parameters<typeof z.date>[0]) {
+export function date(
+  params?: Parameters<typeof z.date>[0],
+): z.ZodPipe<z.ZodTransform<unknown, unknown>, z.ZodDate> {
   return z.preprocess(coerceDate, z.date(params));
 }
 
@@ -50,42 +60,55 @@ export function date(params?: Parameters<typeof z.date>[0]) {
 export function enum_<const T extends readonly string[]>(
   values: T,
   params?: Parameters<typeof z.enum>[1],
-) {
+): z.ZodPipe<
+  z.ZodTransform<unknown, unknown>,
+  z.ZodEnum<{
+    [k in keyof { [k in T[number]]: k }]: { [k in T[number]]: k }[k];
+  }>
+> {
   return z.preprocess(coerceString, z.enum(values, params));
 }
 
 /**
  * @deprecated The Zod utilities will be removed in the next major release.
  */
-export function file(params?: Parameters<typeof z.file>[0]) {
+export function file(
+  params?: Parameters<typeof z.file>[0],
+): z.ZodPipe<z.ZodTransform<unknown, unknown>, z.ZodFile> {
   return z.preprocess(coerceFile, z.file(params));
 }
 
 /**
  * @deprecated The Zod utilities will be removed in the next major release.
  */
-export function email(params?: Parameters<typeof z.email>[0]) {
+export function email(
+  params?: Parameters<typeof z.email>[0],
+): z.ZodPipe<z.ZodTransform<unknown, unknown>, z.ZodEmail> {
   return z.preprocess(coerceString, z.email(params));
 }
 
 /**
  * @deprecated The Zod utilities will be removed in the next major release.
  */
-export function url(params?: Parameters<typeof z.url>[0]) {
+export function url(
+  params?: Parameters<typeof z.url>[0],
+): z.ZodPipe<z.ZodTransform<unknown, unknown>, z.ZodURL> {
   return z.preprocess(coerceString, z.url(params));
 }
 
 /**
  * @deprecated The Zod utilities will be removed in the next major release.
  */
-export const object = z.object;
+export const object: <T extends z.ZodRawShape>(
+  shape: T,
+) => z.ZodObject<z.core.util.Writeable<T>, z.core.$strip> = z.object;
 
 /**
  * @deprecated The Zod utilities will be removed in the next major release.
  */
 export function array<T extends z.core.SomeType>(
   element: T,
   params?: Parameters<typeof z.array>[1],
-) {
+): z.ZodPipe<z.ZodTransform<unknown[], unknown>, z.ZodArray<T>> {
   return z.preprocess(coerceArray, z.array(element, params));
 }

tsconfig.json

@@ -9,7 +9,7 @@
     // See also https://aka.ms/tsconfig/module
     "module": "nodenext",
     "target": "esnext",
-    "types": ["node"],
+    "types": [],
     "lib": ["esnext", "dom", "dom.iterable"],
 
     // Other Outputs
@@ -35,6 +35,7 @@
     "jsx": "react-jsx",
     "verbatimModuleSyntax": true,
     "isolatedModules": true,
+    "isolatedDeclarations": true,
     "noUncheckedSideEffectImports": true,
     "moduleDetection": "force",
     "skipLibCheck": true