All files AndThen.ts

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import * as ValidationFn from 'fp-ts/lib/Validation';
 
import Decoder, { Decoded } from './Decoder';
 
export default class AndThen<a, b> extends Decoder<b> {
  private decoderFn: (value: a) => Decoder<b>;
  private decoder: Decoder<a>;
 
  constructor(decoderFn: (value: a) => Decoder<b>, decoder: Decoder<a>) {
    super();
    this.decoder = decoder;
    this.decoderFn = decoderFn;
  }
 
  public run(value: unknown): Decoded<b> {
    return this.decoder.run(value).fold(
      (errors) => ValidationFn.failure(errors),
      (success) => this.decoderFn(success).run(value),
    );
  }
}