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yup.MixedSchema.when() method

Signature:

when<V>(key: string, builder: {
        is: boolean | ((value: V) => boolean);
        then: GetSchema<T>;
        otherwise: GetSchema<T>;
    }): this;

Parameters

Parameter	Type	Description
key	string
builder	{ is: boolean | ((value: V) => boolean); then: GetSchema<T>; otherwise: GetSchema<T>; }

Returns:

this

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