isBoolean

isBoolean

Verifies if provided Verificable represents a boolean value. Only boolean values (true, false) are matching, meaning that 'truthy'/'falsey' values are not matching this Predicate.

Possible errors:

If provided Verificable is not a boolean:

{
    type: "isBoolean",
    path: [/* ... */]
}

Examples:

Each of examples uses this import statement:

const { asVerificable, isValid, isBoolean } = require("verifica");

Null or undefined is not considered a boolean:

const verificable = asVerificable(null);
isValid(verificable, isBoolean); // false

String value is not considered a boolean as well:

const verificable = asVerificable("true");
isValid(verificable, isBoolean); // false

true and false are considered boolean values:

const verificable = asVerificable(false);
isValid(verificable, isBoolean); // true