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Runtime (recursive) type-checking for JavaScript.
$ npm install rttc --save
var rttc = require('rttc');
.validate()
either returns a (potentially "lightly" coerced) version of the value that was accepted, or it throws. The "lightly" coerced value might turn "3"
into 3
, "true"
into true
, -4.5
into "-4.5"
, etc..coerce()
ALWAYS returns an acceptable version of the value, even if it has to mangle it to get there (i.e. by using the "base value" for the expected type.)""
0
false
{}
), base value is {}
, with whatever keys are expected (recursive)[]
), base value is []
, with a single archetypal item matching the expectation (recursive)undefined
will always be coerced to the base value of the expected type.null
is never valid.NaN
is never valid.Infinity
is never valid.-Infinity
is never valid.{
id: 'number',
name: 'string',
isAdmin: 'boolean',
mom: {
id: 'number',
name: 'string',
occupation: {
title: 'string',
workplace: 'string'
}
}
}
[
{
id: 'number',
name: 'string',
email: 'string',
age: 'number',
isAdmin: 'boolean',
favoriteColors: ['string'],
friends: [
{
id: 'number',
name: 'string'
}
]
}
]
Infer the type/schema of the provided value.
require('rttc').infer(false);
// => 'boolean'
require('rttc').infer(0);
// => 'number'
require('rttc').infer({
foo: 'bar'
});
// => { foo: 'string' }
require('rttc').infer({
foo: 'whatever',
bar: { baz: true }
});
// => { foo: 'string', bar: { baz: 'boolean' } }
require('rttc').infer([{
foo: ['bar']
}]);
// => [{ foo: ['string'] }]
require('rttc').infer({
user: {
friends: [{
name: 'Lenny',
age: 77
}]
});
// =>
/*
{
user: {
friends: [{
name: 'Lenny',
age: 77
}]
}
*/
rttc.validate('string', 'foo');
// => 'foo'
rttc.validate('number', 4.5);
// => 4.5
rttc.validate('boolean', true);
// => true
rttc.validate('string', -2);
// => '-2'
rttc.validate('string', false);
// => 'false'
rttc.validate('number', '3');
// => 3
rttc.validate('boolean', 'true');
// => true
rttc.validate({
user: {
friends: [{
name: 'Lenny',
age: 77
}]
}, {
user: {
friends: [{
name: 'Lenny',
age: '77'
}]
}
});
// =>
/*
{
user: {
friends: [{
name: 'Lenny',
age: 77
}]
}
}
*/
If value cannot be properly coerced, throws error with code=E_INVALID_TYPE
:
rttc.validate('number', 'asdf');
// throws E_INVALID_TYPE
rttc.coerce('string', 'foo');
// => 'foo'
rttc.coerce('number', 4.5);
// => 4.5
rttc.coerce('boolean', true);
// => true
rttc.coerce('string', -2);
// => '-2'
rttc.coerce('string', false);
// => 'false'
rttc.coerce('number', '3');
// => 3
rttc.coerce('boolean', 'true');
// => true
If value can't be properly coerced, the "base value" for the type will be used:
rttc.coerce('number', 'asdf');
// => 0
rttc.coerce('boolean', 'asdf');
// => false
rttc.coerce({
user: {
friends: [{
name: 'Lenny',
age: 77
}]
}, 'err... some dude who\'s friends with lenny?');
// =>
/*
{
user: {
friends: [{
name: 'Lenny',
age: 77
}]
}
}
*/
FAQs
Runtime type-checking for JavaScript.
The npm package rttc receives a total of 32,137 weekly downloads. As such, rttc popularity was classified as popular.
We found that rttc demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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