1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
import { z } from 'https://deno.land/x/zod@v3.19.1/mod.ts'import type { ErrorWithMessage, SchemaError } from './types.ts'
function isErrorWithMessage(error: unknown): error is ErrorWithMessage {  return (    typeof error === 'object' &&    error !== null &&    'message' in error &&    typeof (error as Record<string, unknown>).message === 'string'  )}
function toErrorWithMessage(maybeError: unknown): ErrorWithMessage {  if (isErrorWithMessage(maybeError)) return { message: maybeError.message }  return { message: String(maybeError) }}
function schemaError(message: string, path: string): SchemaError {  return { message, path: path.split('.') }}
const errorMessagesFor = (errors: SchemaError[], name: string) =>  errors    .filter(({ path }) => path.join('.') === name)    .map(({ message }) => message)
type NestedErrors<SchemaType> = {  [Property in keyof SchemaType]: string[] | NestedErrors<SchemaType[Property]>}
const errorMessagesForSchema = <T extends z.ZodTypeAny>(  errors: SchemaError[],  schema: T,): NestedErrors<z.infer<typeof schema>> => {  type SchemaType = z.infer<typeof schema>  type ErrorObject = { path: string[]; messages: string[] }
  const nest = (    { path, messages }: ErrorObject,    root: Record<string, unknown>,  ) => {    const [head, ...tail] = path    root[head] =      tail.length === 0        ? messages        : nest(            { path: tail, messages },            (root[head] as Record<string, unknown>) ?? {},          )    return root  }
  const compareStringArrays = (a: string[]) => (b: string[]) =>    JSON.stringify(a) === JSON.stringify(b)
  const toErrorObject = (errors: SchemaError[]): ErrorObject[] =>    errors.map(({ path, message }) => ({      path,      messages: [message],    }))
  const unifyPaths = (errors: SchemaError[]) =>    toErrorObject(errors).reduce((memo, error) => {      const comparePath = compareStringArrays(error.path)      const mergeErrorMessages = ({ path, messages }: ErrorObject) =>        comparePath(path)          ? { path, messages: [...messages, ...error.messages] }          : { path, messages }      const existingPath = memo.find(({ path }) => comparePath(path))
      return existingPath ? memo.map(mergeErrorMessages) : [...memo, error]    }, [] as ErrorObject[])
  const errorTree = unifyPaths(errors).reduce((memo, schemaError) => {    const errorBranch = nest(schemaError, memo)
    return { ...memo, ...errorBranch }  }, {}) as NestedErrors<SchemaType>
  return errorTree}
class InputError extends Error {  path: string
  constructor(message: string, path: string) {    super(message)    this.name = 'InputError'    this.path = path  }}
class InputErrors extends Error {  errors: { message: string; path: string }[]
  constructor(errors: { message: string; path: string }[]) {    super(`${errors.length} errors`)    this.errors = errors  }}
class EnvironmentError extends Error {  path: string
  constructor(message: string, path: string) {    super(message)    this.name = 'EnvironmentError'    this.path = path  }}
export {  errorMessagesFor,  errorMessagesForSchema,  schemaError,  toErrorWithMessage,  InputError,  EnvironmentError,  InputErrors,}