autotyper

autotyper is a tiny CLI that turns a fast, human-friendly DSL into clean TypeScript types — with optional interface, zod schema, and example object generation.

If you’re tired of repeatedly typing:

export type User = {
  id: string;
  email: string;
  createdAt: Date;
};

…this tool is for you.

Installation

npm (global)

npm i -g @ficazam31/autotyper

bun (global)

bun add -g @ficazam31/autotyper

If the binary is not picked up on your system:

bunx @ficazam31/autotyper --help

Quick start

Generate a TypeScript type:

autotyper "User email:s password:s name:s isAdmin?:b createdAt:d tags:s[]"

Generate everything at once (type + interface + zod + example):

autotyper --mode all "User email:s password:s isAdmin?:b createdAt:d tags:s[]"

Pipe input from stdin:

echo "User email:s createdAt:d" | autotyper --mode all

DSL format (recommended)

The first token is the type name.
All following tokens are properties.

User email:s password:s name:s isAdmin?:b createdAt:d tags:s[]

Property syntax

• prop:type → explicit type
• prop → type is inferred
• prop? → optional
• prop! → required

Type shorthands

| Shorthand | Type | |---------|------| | s | string | | n | number | | b | boolean | | d | Date | | u | unknown | | a | any |

Arrays are written as:

tags:s[]
scores:n[]
dates:d[]

Passthrough types also work:

User id:UUID metadata:Record<string, string>

Type inference rules

If you don’t provide a type, autotyper infers one:

• createdAt, updatedOn, anything ending in At / On or containing date → Date
• isAdmin, hasPets, canEdit, shouldRetry → boolean
• id, user_id, orderId → string
• plural names like tags, items, users → string[]
• otherwise → string

Example:

autotyper "User id email password isAdmin? createdAt tags"

Output modes

autotyper --mode type "User email:s"
autotyper --mode interface "User email:s"
autotyper --mode zod "User email:s createdAt:d"
autotyper --mode all "User email:s createdAt:d"
autotyper --mode json "User email:s createdAt:d"

Zod strict mode

autotyper --mode zod --strict "User email:s createdAt:d"

Backwards compatibility (old format supported)

autotyper "type:user-email:s/password:s/name:s/isAdmin:b:o"

Examples

Auth DTO

autotyper --mode all "LoginRequest email:s password:s"

User model

autotyper --mode all "User id email name isAdmin?:b createdAt:d tags:s[]"

Name sanitization

autotyper --mode type "user-profile first-name:s default:s 2faEnabled?:b"

License

MIT