class Buildermethod

required()

Adds a required check (not null, undefined, NaN, or empty string).

required(error?: StringConvertible): Builder<Exclude<T, undefined | null>>;

Notes

• Applied after all other checks and transformations added so far.
• If no error message is provided, the default message is used; see Schema.errors.

Parameters

• error — Custom error message.

Return value

This builder, for chaining.

Examples

f.string().required();
f.number().required("Age must be a valid number");

Related

• class Builder static
  A class that represents a validation builder for an input value.