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chore: enhance client-related typings #1227

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Jan 12, 2021
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chore: enhance client-related typings #1227

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0e8d261
Enhance client-related typings
kyle221b Dec 5, 2020
1427e5e
Style fix
kyle221b Dec 17, 2020
8514165
Merge branch 'main' into typing-enhancements
JenniferMah Jan 12, 2021
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5 changes: 4 additions & 1 deletion packages/client/src/client.d.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -46,5 +46,8 @@ declare class Client {
request(data: ClientRequest, cb?: (err: ResponseError, response: [ClientResponse, any]) => void): Promise<[ClientResponse, any]>;
}

declare const client: Client & { Client: typeof Client };
declare const client: Client;
// @ts-ignore
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This matches style of mail.d.ts file. Part that I wanted to change here mainly was the { Client: typeof Client } piece. I get the feeling that the goal there was to expose the class as a type, but we do typeof on the class itself, instead of an instance of it, so it ends up being a type with just a prototype field. Let me know if I'm missing something here.

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I believe this change might break folks: #986

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yeah the goal here was to export Client as not just a value with type typeof Client, but to export the class itself, which could be used as a value or a type. im pretty sure this will only enhance the existing functionality. currently, users could do:
const a = new Client()

but the only way they could pass the actual type around is by doing a default import of the singleton client and then doing a typeof on it.

am i missing something here?

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I don't quite understand why this method is better than what we have. Perhaps a good way to illustrate is to add a sample quick start here.

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To give a quick code example:

import { Client } from '@sendgrid/client';

// This is possible in both versions
const client = new Client();

// This (I think) is only possible in the new version since Client is only a value in the old version and not a type
function somethingThatTakesInAClient(client: Client) {
...
}

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while it isn't necessary, you do it for most of your other types that I've seen, and if you are going to export functionality, it seems to me it would also make sense to export the type

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@kyle221b kyle221b Dec 18, 2020 •
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to further illustrate, in the existing code, we could accomplish the same by doing:

// Note we are importing the singleton client exported by the lib as well as the class itself (as a value)
import client, { Client } from '@sendgrid/client';

// We can do a typeof on the singleton instance. This is equivalent to what is in the last example. For this one you need // to import a singleton instance of the client just to get the type
function somethingThatTakesInAClient(arg: typeof client) {
...
}

// This compiles, but the behavior isn't what you expect. Since we are doing typeof on the class, the only members are // things on the function prototype, so we can't access methods like 'setApiKey' for example
function anotherThingThatLooksLikeItTakesInAClientButDoesntReally(arg: typeof Client) {
...
}

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Here's an example where you use the proposed pattern: https://github.com/sendgrid/sendgrid-nodejs/blob/main/packages/mail/src/mail.d.ts#L39-L42.

export = client

export {Client};
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We would need to revert this change also if we move back to declare const client: Client & { Client: typeof Client };

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left a comment above about why I did this. let me know what you think

3 changes: 3 additions & 0 deletions packages/helpers/classes/request.d.ts
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@@ -1,3 +1,5 @@
import * as https from 'https';

type HttpMethod = 'get'|'GET'|'post'|'POST'|'put'|'PUT'|'patch'|'PATCH'|'delete'|'DELETE';

export default interface RequestOptions<TData = any, TParams = object> {
Expand All @@ -7,4 +9,5 @@ export default interface RequestOptions<TData = any, TParams = object> {
qs?: TParams;
body?: TData;
headers?: object;
httpsAgent?: https.Agent;
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I believe this data is stored in headers.

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this is a top-level field on an axios request. i don't think we'd want to pass it in headers b/c it won't actually get sent across the wire, it's just connection settings essentially.

if we were to add it to headers, then there would need to be a code change in the JS file to filter it out and pass it as a top-level field in the axios request

}
6 changes: 6 additions & 0 deletions packages/mail/src/mail.d.ts
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
import {Client} from "@sendgrid/client";
import {ClientResponse} from "@sendgrid/client/src/response";
import {ResponseError} from "@sendgrid/helpers/classes";
import {MailDataRequired} from "@sendgrid/helpers/classes/mail";
Expand All @@ -8,6 +9,11 @@ declare class MailService {
*/
setApiKey(apiKey: string): void;

/**
* Client to use for invoking underlying API
*/
setClient(client: Client): void;

/**
* Twilio Email Auth passthrough for convenience.
*/
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4 changes: 3 additions & 1 deletion test/typescript/client.ts
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@@ -1,4 +1,5 @@
import Client = require("@sendgrid/client");
import * as https from 'https';

// Test setApiKey() method
Client.setApiKey("MY_SENDGRID_API_KEY");
Expand All @@ -11,7 +12,8 @@ Client.setDefaultHeader({
// Test setDefaultRequest() method
Client.setDefaultRequest({
url: "/test",
}).setDefaultRequest("method", "POST");
}).setDefaultRequest("method", "POST")
.setDefaultRequest('httpsAgent', new https.Agent())

// Test createHeaders() method
Client.createHeaders({
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4 changes: 4 additions & 0 deletions test/typescript/mail.ts
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@@ -1,8 +1,12 @@
import { Client } from "@sendgrid/client";
import sgMail = require("@sendgrid/mail");

// Test setApiKey() method
sgMail.setApiKey("MY_SENDGRID_API_KEY");

// Test setClient() method
sgMail.setClient(new Client());

// Test setSubstitutionWrappers() method
sgMail.setSubstitutionWrappers("{{", "}}")

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