newtype-ts
ts-sql
newtype-ts | ts-sql | |
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12 | 28 | |
570 | 3,114 | |
- | 0.0% | |
0.0 | 0.0 | |
almost 2 years ago | almost 3 years ago | |
TypeScript | TypeScript | |
MIT License | - |
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newtype-ts
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Type-Safe Printf() in TypeScript
Curious what your issue was with duck-typing. Were you effectively looking to create ADTs that are required to go through a specific step-by-step process, not simply 'look like' the thing that was expected?
If so, you might be interested in [newtype-ts].
[newtype-ts]: https://github.com/gcanti/newtype-ts
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Is there a language with custom type support (value objects)?
this one https://github.com/gcanti/newtype-ts ?
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I too prefer no classes
You don't need classes for nominal types: https://github.com/gcanti/newtype-ts
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When do you find Branding to be useful?
Creating newtypes (via newtype-ts) for fractions and percentages is worthwhile if you're very concerned about correctness, though it's unfortunate that absent typeclasses they're not terribly ergonomic.
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Please put units in names
I haven't used this library in particular or this one, but bless the authors and all the others for trying to make it happen… the project I'm now leading uses strongly typed strings for different component addresses, and it saves me to constantly look up the documentation what the functions need – it's beautiful.
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Type that's NOT another type?
A "nominal" solution with no runtime overhead can be provided by branded types, other words for this are "opaque types" or "newtypes". Some libraries like newtype-ts exist to help with the construction of these. That library README describes it as:
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Is there a way to guarantee that a number variable can never be a non-finite value?
You can also look at the fp-ts ecosystem for inspiration. newtype-ts and io-ts's Branded type with io-ts-type's UUID as a good example
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Branding & Flavoring
Alternatively we can use other more sophisticated techniques to achieve nominal typing or libraries such as: newtype-ts or io-ts.
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Introduction
One using fp-ts and newtype-ts
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Using fp-ts and newtype-ts: types
We are going to use newtype-ts to build a branded type:
ts-sql
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Type-Safe Printf() in TypeScript
There is an implementation of SQL that operates on a table shaped type, entirely at type level. For your amusement: https://github.com/codemix/ts-sql
There are a bunch of more practical takes that codegen types from your database and generate types for your queries, eg: https://github.com/adelsz/pgtyped
To me the second approach seems much more pragmatic because you don’t need to run a SQL parser in a fairly potato interpreter on every build
- Functions and algorithms implemented purely with TypeScript's type system
- Que opinan de esta forma de actualizar estados complejos en React, creen que es buena practica o tienen una mejor forma?
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How to Sell Elixir Again (2023)
> If I would level criticisms at dialyzer it would be its sometimes difficult to read warnings, it’s speed (despite being multithreaded) and the race conditions in the VS Code plugin (which is looking for extra maintainers – if I had time I would help).
One of the advantages of TypeScript is that VSCode is written in TypeScript, and both VSCode and TypeScript are developed by the same company, so there's a really nice synergy there. I imagine Kotlin users feel the same way using Jetbrains products, and Swift users feel the same way about XCode.
Dialyzer looks interesting, but I can't imagine giving up on the expressiveness of TypeScript. Some of the things you can do with generics, mapped types, intersection types, template literal types, conditional types, and utility types are almost mind boggling. It's difficult to reap all of the benefits of static analysis without some of these advanced type operators. The type manipulation section of the TS manual is really underrated.
Someone for example wrote an SQL parser in TypeScript that requires no runtime code [1]. It can infer the types of an SQL query's result based on an SQL string without any runtime code execution. There was a similar project where someone built a JSON parser entirely using the type system [2]. There's also an ongoing discussion on Github about the the fact that TypeScript's type system appears to be a Turing-complete language with some other cool examples [3]. My point is that the type system is incredibly expressive. You rarely run into an idiom that can't be typed effectively.
[1] https://github.com/codemix/ts-sql
[2] https://twitter.com/buildsghost/status/1301976526603206657
[3] https://github.com/microsoft/TypeScript/issues/14833
- Please use Typescript
- TypeScripting the Technical Interview
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Pls can we go back to traditional languages?
If anyone saw this meme and thought, "damn parsing a type from a SQL query, that looks useful" (as I did), the source appears to be from here.
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Type-Level FizzBuzz
I mean, why stop there? https://github.com/codemix/ts-sql
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HypeScript: Simplified TypeScript's type system in TypeScript's own type system
Which allows for things like this type that implements a simplified SQL query parser checked against a provided 'database' object:
https://github.com/codemix/ts-sql
This project was my go-to "nifty but pointless" example for TS string literal types before this article :)
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Deepkit – High-Performance TypeScript Framework
author of ts-sql[0] here, this looks great (and a way more practical approach!)
[0] https://github.com/codemix/ts-sql
What are some alternatives?
io-ts - Runtime type system for IO decoding/encoding
slonik - A Node.js PostgreSQL client with runtime and build time type safety, and composable SQL.
type-fest - A collection of essential TypeScript types
Paste JSON as Code • quicktype - Xcode extension to paste JSON as Swift, Objective-C, and more
fantasy-land - Specification for interoperability of common algebraic structures in JavaScript
pgtyped - pgTyped - Typesafe SQL in TypeScript
io-ts-types - A collection of codecs and combinators for use with io-ts
lean4 - Lean 4 programming language and theorem prover
fp-ts - Functional programming in TypeScript
sqlx - 🧰 The Rust SQL Toolkit. An async, pure Rust SQL crate featuring compile-time checked queries without a DSL. Supports PostgreSQL, MySQL, and SQLite.
Squants - The Scala API for Quantities, Units of Measure and Dimensional Analysis
kanel - Generate Typescript types from Postgres