Add basic coercion

Author: razor-x

src/lib/parse.test.ts

@@ -9,7 +9,7 @@ test('parseUrlSearchParams: with string input', (t) => {
       'foo=d&bar=2',
       z.object({ foo: z.string().optional(), bar: z.number().optional() }),
     ),
-    { foo: 'd', bar: '2' },
+    { foo: 'd', bar: 2 },
   )
 })
 
@@ -19,7 +19,7 @@ test('parseUrlSearchParams: with URLSearchParams input', (t) => {
       new URLSearchParams('foo=d&bar=2'),
       z.object({ foo: z.string().optional(), bar: z.number().optional() }),
     ),
-    { foo: 'd', bar: '2' },
+    { foo: 'd', bar: 2 },
     'with URLSearchParams input',
   )
 })

src/lib/parse.ts

@@ -35,9 +35,10 @@ export const parseUrlSearchParams = (
 }
 
 const parse = (k: string, values: string[], schema: ZodTypeAny): unknown => {
-  if (isZodNumber(schema)) return values[0]
-  if (isZodBoolean(schema)) return values[0]
-  if (isZodString(schema)) return values[0]
+  // TODO: Add better errors with coercion. If coercion fails, passthough?
+  if (isZodNumber(schema)) return Number(values[0])
+  if (isZodBoolean(schema)) return values[0] === 'true'
+  if (isZodString(schema)) return String(values[0])
   if (isZodArray(schema)) return values
   throw new UnparseableSearchParamError(k, 'unsupported type')
 }

test/parse.test.ts

@@ -4,7 +4,7 @@ import { z } from 'zod'
 
 import { parseUrlSearchParams } from '@seamapi/url-search-params-parser'
 
-test('parses empty string', (t) => {
+test('parses empty params', (t) => {
   const schema = z.object({ foo: z.string() })
   const input = {}
   t.deepEqual(