问属性' on‘不存在于“FluentRules<any、any>、FluentEnsure<any>、FluentRuleCustomizer<any、any>”类型上。

EN

import { ValidationRules, FluentRuleCustomizer, FluentEnsure, FluentRules } from 'aurelia-validation';
import { on } from 'cluster';
export class FormHelper {
  private static initializedForms = [];

  public static initializeFormRules(form) {
    if (this.initializedForms.indexOf(form) > -1) {
      return;
    }
    this.initializedForms.push(form);
    for (const field of form.fields) {
      if (field.validation.isValidate) {
        let ruleBuilder: | FluentRules<any, any> | FluentEnsure<any> | FluentRuleCustomizer<any, any>;
        ruleBuilder = ValidationRules
          .ensure("value")
          .displayName(field.label);

        const rules = Object.keys(field.validation.validationRule)
          .map(key => ({ key, value: field.validation.validationRule[key] }));

        for (const rule of rules) {
          ruleBuilder = ruleBuilder[rule.key](rule.value);
        }
//         ruleBuilder['on'](field);
        ruleBuilder.on(field);
      }
    }
  }
}