{%- if operation.HasFormParameters -%}
{%-     if operation.ConsumesFormUrlEncoded -%}
let content_ = "";
{%-         for parameter in operation.FormParameters -%}
{%-             if parameter.IsRequired -%}
{%-                 if parameter.IsNullable -%}
if ({{ parameter.VariableName }} === undefined)
    throw new Error("The parameter '{{ parameter.VariableName }}' must be defined.");
else
{%-                 else -%}
if ({{ parameter.VariableName }} === undefined || {{ parameter.VariableName }} === null)
    throw new Error("The parameter '{{ parameter.VariableName }}' must be defined and cannot be null.");
else
{%-                 endif -%}
{%-             else -%}
{%-                 if parameter.IsNullable -%}
if ({{ parameter.VariableName }} !== undefined)
{%-                 else -%}
if ({{ parameter.VariableName }} === null)
    throw new Error("The parameter '{{ parameter.VariableName }}' cannot be null.");
else if ({{ parameter.VariableName }} !== undefined)
{%-                 endif -%}
{%-             endif -%}
{%-             if parameter.IsDateOrDateTimeArray -%}
    {{ parameter.VariableName }} && {{ parameter.VariableName }}.forEach(item_ => { content_ += encodeURIComponent("{{ parameter.Name }}") + "=" + encodeURIComponent(item_ ? "" + item_.toJSON() : "null") + "&"; });
{%-             elsif parameter.IsObjectArray -%}
    {{ parameter.VariableName }} && {{ parameter.VariableName }}.forEach((item_, index_) => {
        for (let attr_ in item_) {
           if (item_.hasOwnProperty(attr_)) {
                content_ += encodeURIComponent("{{ parameter.Name }}[" + index_ + "]." + attr_) + "=" + encodeURIComponent("" + (item_ as any)[attr_]) + "&";
           }
        }
    });
{%-             elsif parameter.IsDateOrDateTime -%}
    content_ += encodeURIComponent("{{ parameter.Name }}") + "=" + encodeURIComponent({{ parameter.VariableName }} ? "" + {{ parameter.VariableName }}.toJSON() : "{{ QueryNullValue }}") + "&";
{%-             elsif parameter.IsArray -%}
    {{ parameter.VariableName }} && {{ parameter.VariableName }}.forEach(item => { content_ += encodeURIComponent("{{ parameter.Name }}") + "=" + encodeURIComponent("" + item) + "&"; });
{%-             else -%}
    content_ += encodeURIComponent("{{ parameter.Name }}") + "=" + encodeURIComponent("" + {{ parameter.VariableName }}) + "&";
{%-             endif -%}
{%-         endfor -%}
content_ = content_.replace(/&$/, "");

{%-     else -%}
const content_ = new FormData();
{%         for parameter in operation.FormParameters -%}
{%-             if parameter.IsNullable -%}
if ({{ parameter.VariableName }} !== null && {{ parameter.VariableName }} !== undefined)
{%-             else -%}
if ({{ parameter.VariableName }} === null || {{ parameter.VariableName }} === undefined)
    throw new Error("The parameter '{{ parameter.VariableName }}' cannot be null.");
else
{%-             endif -%}
{%-             if parameter.IsFile -%}
{%-                 if parameter.IsArray -%}
    {{ parameter.VariableName }}.forEach(item_ => content_.append("{{ parameter.Name }}", item_.data, item_.fileName ? item_.fileName : "{{ parameter.Name }}") );
{%-                 else -%}
    content_.append("{{ parameter.Name }}", {{ parameter.VariableName }}.data, {{ parameter.VariableName }}.fileName ? {{ parameter.VariableName }}.fileName : "{{ parameter.Name }}");
{%-                 endif -%}
{%-             elsif parameter.IsDateOrDateTime -%}
    content_.append("{{ parameter.Name }}", {{ parameter.VariableName }}.toJSON());
{%-             elsif parameter.IsObject -%}
    content_.append("{{ parameter.Name }}", JSON.stringify({{ parameter.VariableName }}));
{%-             elsif parameter.IsArray -%}
    {{ parameter.VariableName }}.forEach(item_ => content_.append("{{ parameter.Name }}", item_.toString()));
{%-             else -%}
    content_.append("{{ parameter.Name }}", {{ parameter.VariableName }}.toString());
{%-             endif -%}
{%-         endfor -%}
{%-     endif -%}
{%- else -%}
{%-     if operation.HasContent -%}
{%-         if operation.HasBinaryBodyParameter -%}
const content_ = {{ operation.ContentParameter.VariableName }};
{%-         elsif operation.HasXmlBodyParameter -%}
const content_ = {{ operation.ContentParameter.VariableName }};
{%          elsif operation.Consumes == "application/x-www-form-urlencoded" -%}
const content_ = Object.keys({{ operation.ContentParameter.VariableName }} as any).map((key) => {
    return encodeURIComponent(key) + '=' + encodeURIComponent(({{ operation.ContentParameter.VariableName }} as any)[key]);
}).join('&')
{%-         elsif operation.HasPlainTextBodyParameter -%}
const content_ = {{ operation.ContentParameter.VariableName }};
{%-         else -%}
const content_ = JSON.stringify({{ operation.ContentParameter.VariableName }});
{%-         endif -%}
{%-     else -%}
const content_ = undefined;
{%-     endif -%}
{%- endif -%}