Compatibility with Cloudflare Workers

[boywithkeyboard]

I'd like to use TypeBox in Cloudflare Workers, but i keep getting the below error.

Unhandled Promise Rejection: EvalError: Code generation from strings disallowed for this context

Is there any way to work around this?

[sinclairzx81]

@Unvented Hi.

You can use Value.Check(T, value) instead of compiling with the TypeCompiler. The Value.Check(T, value) function will carry out the same runtime checks as the compiled version, however it uses dynamic type checking; which means you will lose out on the performance optimizations you get through compilation (but is relatively still quite fast to use)

import { Value } from '@sinclair/typebox/value'
import { Type } from '@sinclair/typebox'

const T = Type.Object({
   x: Type.Number(),
   y: Type.Number(),
   z: Type.Number()
})

const value = { x: 1, y: 2, z: 3 }

if(!Value.Check(T, value)) {
  const errors = [...Value.Errors(T, value)]
  console.log(errors)
}

Alternatively, if you want to retain the performance, you can inspect the compiled validation routine with the TypeCheck.Code(). To use this, you will need to precompile the schemas first as a build step.

const T = Type.Object({
   x: Type.Number(),
   y: Type.Number(),
   z: Type.Number()
})

const C = TypeCompiler.Compile(T)

console.log(C.Code()) // use this code to validate

Hope that helps
S

[boywithkeyboard]

@sinclairzx81 thank you so much <3