"pipeDelimeted" query parameter format generates invalid node-fetch code

[fabiante]

Hi,

setting the style parameter of a query parameter to pipeDelimited generates invalid typescript-fetch code.

Example Property

- name: searchIn
    in: query
    description: Ids of the columns to search in
    required: true
    style: pipeDelimited
    explode: false
    schema:
    type: array
    items:
        type: integer

api.ts(7404,87): error TS2551: Property 'pipe' does not exist on type '{ csv: string; ssv: string; tsv: string; pipes: string; }'. Did you mean 'pipes'?

Generated code

This is the generated COLLECTION_FORMATS object:

/**
 *
 * @export
 */
export const COLLECTION_FORMATS = {
    csv: ",",
    ssv: " ",
    tsv: "\t",
    pipes: "|",
};

And this is the code that tries to access an invalid property of COLLECTION_FORMATS:

if (searchIn) {
    localVarQueryParameter['searchIn'] = searchIn.join(COLLECTION_FORMATS["pipe"]);
}

[fabiante]

If COLLECTION_FORMATS.pipes is to be renamed to COLLECTION_FORMATS.pipe, the fix should be made in https://github.com/swagger-api/swagger-codegen-generators/blob/master/src/main/resources/handlebars/typescript-fetch/api.mustache.

If the fix should be done in the generated code, I am unsure where to do that. I'd be happy to fix this and submit a PR if someone could give me a hint.

Edit: COLLECTION_FORMATS is accessed for query and header params:

{{^isCollectionFormatMulti}}
   localVarQueryParameter['{{baseName}}'] = {{paramName}}.join(COLLECTION_FORMATS["{{collectionFormat}}"]);
{{/isCollectionFormatMulti}}

To me it seems that another potential cause of this bug may be that collectionFormat is "pipe" but should actually be "pipes". Honestly I don't know what would be correct.

Edit 2: Seems like in the java code the collectionFormat is set to "pipe". I'll submit a PR with the template fixed.