Make it easier to extend zod-transform-socials

Author: essential-randomness

.changeset/social-objects-extend.md

@@ -0,0 +1,11 @@
+---
+"@fujocoded/zod-transform-socials": patch
+---
+
+Exports `SocialLinkObjectSchema` so projects can extend the object form of a
+social link without rebuilding the whole schema. `SocialLinkInputSchema` is also
+available as the clearer name for the default one-item input schema, with
+matching `SocialLinkObject` and `SocialLinkInput` types.
+
+Adds standalone examples for preserving custom fields like `label` through
+the transform.

zod-transform-socials/README.md

@@ -156,6 +156,40 @@ interface Props {
 }
 ```
 
+### Extending the input object
+
+If your content needs extra fields before the social links are transformed,
+extend `SocialLinkObjectSchema` and build your own schema:
+
+```ts
+import {
+  SocialLinkObjectSchema,
+  transformSocial,
+  urlSchema,
+} from "@fujocoded/zod-transform-socials"; // or from "@fujocoded/zod-transform-socials/zod4"
+import { z } from "zod";
+
+const SocialLinkWithLabel = z.union([
+  urlSchema.transform(transformSocial),
+  SocialLinkObjectSchema.extend({
+    label: z.string().optional(),
+  }).transform((socialLinkData) => ({
+    ...transformSocial(socialLinkData),
+    label: socialLinkData.label,
+  })),
+]);
+
+const Member = z.object({
+  name: z.string(),
+  contacts: z.array(SocialLinkWithLabel).default([]),
+});
+```
+
+For complete runnable versions, see the standalone extension examples:
+[`03-zod-3-standalone/parse-extension.ts`](./__examples__/03-zod-3-standalone/parse-extension.ts)
+and
+[`04-zod-4-standalone/parse-extension.ts`](./__examples__/04-zod-4-standalone/parse-extension.ts).
+
 ## Setting known domains
 
 For platforms without a fixed domain, like `mastodon`, the built-in matchers

zod-transform-socials/__examples__/03-zod-3-standalone/README.md

@@ -26,7 +26,14 @@ it: you build the schema, you call `.parse()`, you read the result.
    npm start
    ```
 
-3. Run the type check. This checks the same `parse.ts` file and proves
+3. Run the extension script. It shows how to extend the object form with a
+   `label` field and keep that label in the transformed output:
+
+   ```bash
+   npm run extension
+   ```
+
+4. Run the type check. This checks both parse scripts and proves
    the package's exported types resolve correctly under Zod 3:
 
    ```bash

zod-transform-socials/__examples__/03-zod-3-standalone/package.json

@@ -4,6 +4,7 @@
   "private": true,
   "type": "module",
   "scripts": {
+    "extension": "node parse-extension.ts",
     "start": "node parse.ts",
     "typecheck": "tsc --noEmit"
   },

zod-transform-socials/__examples__/03-zod-3-standalone/parse-extension.ts

@@ -0,0 +1,72 @@
+import { strict as assert } from "node:assert";
+import {
+  SocialLinkObjectSchema,
+  transformSocial,
+  urlSchema,
+} from "@fujocoded/zod-transform-socials";
+import { z } from "zod";
+
+const SocialLinkWithLabel = z.union([
+  // Simple links get transformed just like the library does
+  urlSchema.transform(transformSocial),
+  SocialLinkObjectSchema.extend({
+    // We extend object links with an optional label field
+    label: z.string().optional(),
+  }).transform((socialLinkData) => ({
+    // We transform the socialLinkData just like the library does
+    ...transformSocial(socialLinkData),
+    // And we also add the label field
+    label: socialLinkData.label,
+  })),
+]);
+
+const SocialLinksWithLabels = z.array(SocialLinkWithLabel).default([]);
+
+const Member = z.object({
+  name: z.string(),
+  contacts: SocialLinksWithLabels,
+});
+
+const parsed = Member.parse({
+  name: "essential-randomness",
+  contacts: [
+    {
+      url: "https://essentialrandomness.com",
+      label: "Website",
+    },
+    {
+      url: "https://indiepocalypse.social/@essentialrandom",
+      platform: "mastodon",
+      label: "Mastodon",
+    },
+    "https://github.com/essential-randomness",
+  ],
+});
+
+assert.deepStrictEqual(parsed, {
+  name: "essential-randomness",
+  contacts: [
+    {
+      url: "https://essentialrandomness.com",
+      platform: "custom",
+      username: null,
+      icon: null,
+      label: "Website",
+    },
+    {
+      icon: "simple-icons:mastodon",
+      url: "https://indiepocalypse.social/@essentialrandom",
+      platform: "mastodon",
+      username: null,
+      label: "Mastodon",
+    },
+    {
+      url: "https://github.com/essential-randomness",
+      platform: "github",
+      username: "essential-randomness",
+      icon: "simple-icons:github",
+    },
+  ],
+});
+
+console.log(JSON.stringify(parsed, null, 2));

zod-transform-socials/__examples__/03-zod-3-standalone/parse.ts

@@ -2,8 +2,8 @@ import { strict as assert } from "node:assert";
 import { z } from "zod";
 import { SocialLinks } from "@fujocoded/zod-transform-socials";
 import type {
+  SocialLinkInput,
   SocialLinksData,
-  SocialsSchema,
 } from "@fujocoded/zod-transform-socials";
 
 // Use `SocialLinks` as a schema field to parse and enrich contact URLs.
@@ -12,9 +12,9 @@ const Member = z.object({
   contacts: SocialLinks,
 });
 
-// `SocialsSchema` types each item the schema will accept: a bare URL string,
+// `SocialLinkInput` types each item the schema will accept: a bare URL string,
 // or an object that overrides the detected platform / username / icon.
-const contacts: SocialsSchema[] = [
+const contacts: SocialLinkInput[] = [
   "https://essentialrandomness.com",
   "https://essential-randomness.tumblr.com",
   "https://twitter.com/essentialrandom",

zod-transform-socials/__examples__/03-zod-3-standalone/tsconfig.json

@@ -7,5 +7,5 @@
     "skipLibCheck": false,
     "noEmit": true
   },
-  "include": ["parse.ts"]
+  "include": ["parse*.ts"]
 }

zod-transform-socials/__examples__/04-zod-4-standalone/.npmrc

@@ -0,0 +1,7 @@
+# Copy the local `file:../..` package into node_modules instead of symlinking it.
+# Without this, TypeScript can realpath the package's `/zod4` declarations back
+# to this workspace and resolve `zod/v4` against the workspace's Zod 3 dev
+# dependency instead of this consumer's zod@4, mixing Zod type families. A real
+# registry install has no workspace symlink, so this flag makes the local file
+# install match published-package resolution.
+install-links=true

zod-transform-socials/__examples__/04-zod-4-standalone/README.md

@@ -26,7 +26,14 @@ standalone example, except the import comes from
    npm start
    ```
 
-3. Run the type check. This checks the same `parse.ts` file and proves
+3. Run the extension script. It shows how to extend the object form with a
+   `label` field and keep that label in the transformed output:
+
+   ```bash
+   npm run extension
+   ```
+
+4. Run the type check. This checks both parse scripts and proves
    the package's `/zod4` exported types resolve correctly under Zod 4:
 
    ```bash