import yaml as const

[FlorianB-DE]

Hey there,
for my use case it would be nice, if the yaml could be imported "as const" so that typescript would make literal types e.g.

test:
  one: one
  two: two

import test from "./test.yaml";
// currently: 
typeof test // -> { test: { one: string, two: string } }

// as const
typeof test // -> { test: { one: "one", two: "two" } }

this would be beneficial to mapped types since we can then narrow the inference:

type Keys = keyof typeof test['test']; // is "one" | "two"
type Values = typeof test['test'][Keys]; // is string but could be "one" | "two" 

[cabralpinto]

Hi @FlorianB-DE! Thanks for the issue. My aim with this library is to copy the exact behavior of JSON imports im Typescript, but for YAML files. Could you confirm if this is how it works with JSON imports?

[FlorianB-DE]

There is an open issue on Typescript to support this microsoft/TypeScript#32063

[cabralpinto]

Interesting, I'll take a better look when I can. I might try to implement the syntax suggested in the Typescript issue you linked:

import data from "./data.yaml" with { type: "yaml", const: true };

I'd like to keep the default behavior as similar to JSON as possible, so this could be a good solution.

[FlorianB-DE]

Hey there, that would be wonderful! I thank you for your library nevertheless, it works wonderfully ^^