face-api/src/classes/LabeledFaceDescriptors.ts

export class LabeledFaceDescriptors {
  private _label: string

  private _descriptors: Float32Array[]

  constructor(label: string, descriptors: Float32Array[]) {
    if (!(typeof label === 'string')) {
      throw new Error('LabeledFaceDescriptors - constructor expected label to be a string');
    }

    if (!Array.isArray(descriptors) || descriptors.some((desc) => !(desc instanceof Float32Array))) {
      throw new Error('LabeledFaceDescriptors - constructor expected descriptors to be an array of Float32Array');
    }

    this._label = label;
    this._descriptors = descriptors;
  }

  public get label(): string { return this._label; }

  public get descriptors(): Float32Array[] { return this._descriptors; }

  public toJSON(): any {
    return {
      label: this.label,
      descriptors: this.descriptors.map((d) => Array.from(d)),
    };
  }

  public static fromJSON(json: any): LabeledFaceDescriptors {
    const descriptors = json.descriptors.map((d: any) => new Float32Array(d));
    return new LabeledFaceDescriptors(json.label, descriptors);
  }
}