Comments (1)
@MentalGear Hi,
Check
TypeBox will terminate on the first error with Check
by default. Internally, this is done using chained logical expressions (A && B && C
) where if A
fails, condition B
and C
are not checked.
const A = () => { console.log('A'); return false }
const B = () => { console.log('B'); return true }
const C = () => { console.log('C'); return true }
const R = A() && B() && C() // only A is printed
All checks are implemented using logical expressions like the above.
Errors
Unlike Check, TypeBox uses an iterator system for Errors. Because errors may need to be exhaustive, the Check logic is re-implemented for the Errors to "NOT use chained expressions" and to "NOT terminate on error". Instead the Errors function will yield
at each failure case and continue
....the caller receiving the errors can chose to yield only the first (terminate on error) or all (exhaustive checking)
const T = Type.Object({ ... })
const F = Value.Errors(T, { ... }).First() // terminate at first error
const A = [...Value.Errors(T, { ... })] // exhaustive errors
This means that there no need to implement a strict mode, as the caller can chose either first
or exhaustive
processing by receiving values of the iterator.
Usage
Putting it all together, the following implements a Parse function using both Check and Errors.
import { Type, Static, TSchema } from '@sinclair/typebox'
import { Value } from '@sinclair/typebox/value'
export function Parse<T extends TSchema>(schema: T, value: unknown): Static<T> {
if(Value.Check(schema, value)) return value // check and return
const first = Value.Errors(schema, value).First()! // optionally gather diagnostics
throw Error(first.message) // ... and throw
}
const A = Parse(Type.String(), 'hello')
from typebox.
Related Issues (20)
- Regression bug 0.32.19 HOT 2
- TypeGuard.IsEnum HOT 2
- Better pre-validation errors for invalid TypeBox schema HOT 2
- Static resolution is not working as expected when using a generic function to generate a schema HOT 3
- tsconfig "strict": true - ignore modifiers HOT 2
- `Static` types cannot be used to enforce types from a generic parameter HOT 3
- Applying refinements + general advice on my implementation HOT 11
- Unable to create value of custom class type HOT 2
- Migrate to regexp vs string type in pattern HOT 4
- feedback on Refinement API HOT 2
- Type.Date() cause errors with fastify and querybuilder returning type Date HOT 2
- Should coerce type to array HOT 2
- Interconnected interfaces, missing type annotations and maximum length exceeded. HOT 2
- Optimisations to inference in 0.32 seems to cause `ts(2589)` with composite types. HOT 16
- Add trim option to Type.String() HOT 1
- Should add option to remove redundant prop in Convert() HOT 1
- Metadata missing in custom types HOT 2
- Schema of JSON Schema HOT 3
- Utility type inference appears missing or broken HOT 2
- How to express function optional parameter? HOT 5
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from typebox.