How to use the @angular/flex-layout.validateBasis function in @angular/flex-layout

SplitAreaDirective.prototype.getInputFlexParts = function () {
        var flex = this.flexDirective;
        var basis = this.fxFlex || '1 1 1e-9px';
        return validateBasis(String(basis).replace(';', ''), flex._queryInput('grow'), flex._queryInput('shrink'));
    };
    SplitAreaDirective.prototype.updateStyle = function (flexBasis) {

getFlexParts() {
    const flex = this.flexDirective as any;
    const basis = flex._queryInput('flex') || '1 1 1e-9px';
    return validateBasis(
      String(basis).replace(';', ''),
      (flex as any)._queryInput('grow'),
      (flex as any)._queryInput('shrink')
    );
  }

private getCurrentFlexParts() {
    const flex = this.flexDirective;
    const basis = (flex && flex.activatedValue) || '1 1 1e-9px';
    return validateBasis(String(basis).replace(';', ''), flex.grow, flex.shrink);
  }
}

getInputFlexParts() {
    const flex = this.flexDirective as any;
    const basis = this.fxFlex || '1 1 1e-9px';
    return validateBasis(
      String(basis).replace(';', ''),
      (flex as any)._queryInput('grow'),
      (flex as any)._queryInput('shrink')
    );
  }