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@recoiljs/recoil
Advanced tools
Refine is a type-refinement / validator combinator library for mixed / unknown values in Flow or TypeScript.
Refine is currently bundled as part of the Recoil Sync package.
Please see the Refine Documentation. To get started learning about Refine, check out the documentation on the core concepts of Utilities and Checkers.
unknown
TypeScript type or mixed
Flow type values and you need to assert those values have a specific static type.Coerce unknown types to a strongly typed variable. assertion()
will throw if the input doesn't match the expected type while coercion()
will return null
.
const myObjectChecker = object({
numberProperty: number(),
stringProperty: optional(string()),
arrayProperty: array(number()),
});
const myObjectAssertion = assertion(myObjectChecker);
const myObject: CheckerReturnType<myObjectChecker> = myObjectAssertion({
numberProperty: 123,
stringProperty: 'hello',
arrayProperty: [1, 2, 3],
});
Using match()
and asType()
you can upgrade from previous types to the latest version.
const myChecker: Checker<{str: string}> = match(
object({str: string()}),
asType(string(), str => ({str: str})),
asType(number(), num => ({str: String(num)})),
);
const obj1: {str: string} = coercion(myChecker({str: 'hello'}));
const obj2: {str: string} = coercion(myChecker('hello'));
const obj3: {str: string} = coercion(myChecker(123));
Refine wraps JSON
to provide a built-in strongly typed parser.
const myParser = jsonParser(
array(object({num: number()}))
);
const result = myParser('[{"num": 1}, {"num": 2}]');
if (result != null) {
// we can now access values in num typesafe way
assert(result[0].num === 1);
} else {
// value failed to match parser spec
}
The Recoil Sync library leverages Refine for type refinement, input validation, and upgrading types for backward compatibility. See the recoil-sync
docs for more details.
Refine is currently bundled as part of the Recoil Sync package.
Development of Recoil happens in the open on GitHub, and we are grateful to the community for contributing bugfixes and improvements. Read below to learn how you can take part in improving Recoil.
Recoil is MIT licensed.
FAQs
Recoil - A state management library for React
The npm package @recoiljs/recoil receives a total of 0 weekly downloads. As such, @recoiljs/recoil popularity was classified as not popular.
We found that @recoiljs/recoil demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 3 open source maintainers collaborating on the project.
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