feat: switch zod-to-ts to zod-to-json-schema

package.json

@@ -65,7 +65,6 @@
     "uuid": "^9.0.0",
     "zod": "^3.21.4",
     "zod-to-json-schema": "^3.21.2",
-    "zod-to-ts": "^1.1.4",
     "zod-validation-error": "^1.3.0"
   },
   "devDependencies": {

pnpm-lock.yaml

@@ -86,9 +86,6 @@ dependencies:
   zod-to-json-schema:
     specifier: ^3.21.2
     version: 3.21.2(zod@3.21.4)
-  zod-to-ts:
-    specifier: ^1.1.4
-    version: 1.1.4(typescript@5.1.3)(zod@3.21.4)
   zod-validation-error:
     specifier: ^1.3.0
     version: 1.3.0(zod@3.21.4)
@@ -4448,6 +4445,7 @@ packages:
     resolution: {integrity: sha512-XH627E9vkeqhlZFQuL+UsyAXEnibT0kWR2FWONlr4sTjvxyJYnyefgrkyECLzM5NenmKzRAy2rR/OlYLA1HkZw==}
     engines: {node: '>=14.17'}
     hasBin: true
+    dev: true
 
   /uglify-js@3.17.4:
     resolution: {integrity: sha512-T9q82TJI9e/C1TAxYvfb16xO120tMVFZrGA3f9/P4424DNu6ypK103y0GPFVa17yotwSyZW5iYXgjYHkGrJW/g==}
@@ -4645,16 +4643,6 @@ packages:
       zod: 3.21.4
     dev: false
 
-  /zod-to-ts@1.1.4(typescript@5.1.3)(zod@3.21.4):
-    resolution: {integrity: sha512-jsCg+pTNxLAdJOfW4ul+SpechdGYEJPPnssSbqWdR2LSIkotT22k+UvqPb1nEHwe/YbEcbUOlZUfGM0npgR+Jg==}
-    peerDependencies:
-      typescript: ^4.9.4 || ^5.0.2
-      zod: ^3
-    dependencies:
-      typescript: 5.1.3
-      zod: 3.21.4
-    dev: false
-
   /zod-validation-error@1.3.0(zod@3.21.4):
     resolution: {integrity: sha512-4WoQnuWnj06kwKR4A+cykRxFmy+CTvwMQO5ogTXLiVx1AuvYYmMjixh7sbkSsQTr1Fvtss6d5kVz8PGeMPUQjQ==}
     engines: {node: '>=16.0.0'}

src/llms/chat.ts

@@ -2,7 +2,7 @@ import { JSONRepairError, jsonrepair } from 'jsonrepair'
 import { dedent } from 'ts-dedent'
 import { type SetRequired } from 'type-fest'
 import { ZodType, z } from 'zod'
-import { printNode, zodToTs } from 'zod-to-ts'
+import { zodToJsonSchema } from 'zod-to-json-schema'
 
 import * as errors from '@/errors'
 import * as types from '@/types'
@@ -275,22 +275,12 @@ export abstract class BaseChatCompletion<
       return null
     }
 
-    // TODO: replace zod-to-ts with zod-to-json-schema?
+    const schema = zodToJsonSchema(outputSchema) as types.Jsonifiable
-    const { node } = zodToTs(outputSchema)
+    const schemaStr = stringifyForModel(schema, [
-
+      'default',
-    if (node.kind === 152) {
+      'additionalProperties',
-      // Handle raw strings differently:
+      '$schema'
-      return dedent`Output a raw string only, without any additional text.`
+    ])
-    }
-
-    const tsTypeString = printNode(node, {
-      removeComments: false,
-      // TODO: this doesn't seem to actually work, so we're doing it manually below
-      omitTrailingSemicolon: true,
-      noEmitHelpers: true
-    })
-      .replace(/^ {4}/gm, '  ')
-      .replace(/;$/gm, '')
     let label: string
     if (outputSchema instanceof z.ZodArray) {
       label = 'JSON array (minified)'
@@ -306,9 +296,9 @@ export abstract class BaseChatCompletion<
       label = 'JSON value'
     }
 
-    return dedent`Do not output code. Output a single ${label} in the following TypeScript format:
+    return dedent`Do not output code. Output a single ${label} according to the following JSON Schema:
-        \`\`\`ts
+        \`\`\`json
-        ${tsTypeString}
+        ${schemaStr}
         \`\`\``
   }
 

src/utils.ts

@@ -1,5 +1,6 @@
 import { customAlphabet, urlAlphabet } from 'nanoid'
 import type { ThrottledFunction } from 'p-throttle'
+import { JsonValue } from 'type-fest'
 
 import * as types from './types'
 
@@ -132,7 +133,10 @@ export function chunkMultipleStrings(
  * @param json - JSON value to stringify
  * @returns stringified value with all double quotes around object keys removed
  */
-export function stringifyForModel(json: types.Jsonifiable): string {
+export function stringifyForModel(
+  json: types.Jsonifiable,
+  omit: string[] = []
+): string {
   const UNIQUE_PREFIX = defaultIDGeneratorFn()
   return (
     JSON.stringify(json, replacer)
@@ -143,7 +147,11 @@ export function stringifyForModel(json: types.Jsonifiable): string {
   /**
    * Replacer function prefixing all keys with a unique identifier.
    */
-  function replacer(_: string, value: any) {
+  function replacer(key: string, value: JsonValue) {
+    if (omit.includes(key)) {
+      return undefined
+    }
+
     if (value && typeof value === 'object') {
       if (Array.isArray(value)) {
         return value
@@ -152,7 +160,7 @@ export function stringifyForModel(json: types.Jsonifiable): string {
       const replacement = {}
 
       for (const k in value) {
-        if (Object.hasOwnProperty.call(value, k)) {
+        if (Object.hasOwnProperty.call(value, k) && !omit.includes(k)) {
           replacement[UNIQUE_PREFIX + k] = value[k]
         }
       }