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Merge pull request #15 from mistralai/gaspardBT/fix-stream-tc
Fix agent stream and tool type
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| # Standalone Functions | ||
|
|
||
| > [!NOTE] | ||
| > This section is useful if you are using a bundler and targetting browsers and | ||
| > runtimes where the size of an application affects performance and load times. | ||
| Every method in this SDK is also available as a standalone function. This | ||
| alternative API is suitable when targetting the browser or serverless runtimes | ||
| and using a bundler to build your application since all unused functionality | ||
| will be tree-shaken away. This includes code for unused methods, Zod schemas, | ||
| encoding helpers and response handlers. The result is dramatically smaller | ||
| impact on the application's final bundle size which grows very slowly as you use | ||
| more and more functionality from this SDK. | ||
|
|
||
| Calling methods through the main SDK class remains a valid and generally more | ||
| more ergonomic option. Standalone functions represent an optimisation for a | ||
| specific category of applications. | ||
|
|
||
| ## Example | ||
|
|
||
| ```typescript | ||
| import { MistralCore } from "@mistralai/mistralai/core.js"; | ||
| import { filesUpload } from "@mistralai/mistralai/funcs/filesUpload.js"; | ||
| import { SDKValidationError } from "@mistralai/mistralai/models/errors/sdkvalidationerror.js"; | ||
| import { openAsBlob } from "node:fs"; | ||
|
|
||
| // Use `MistralCore` for best tree-shaking performance. | ||
| // You can create one instance of it to use across an application. | ||
| const mistral = new MistralCore({ | ||
| apiKey: process.env["MISTRAL_API_KEY"] ?? "", | ||
| }); | ||
|
|
||
| async function run() { | ||
| const res = await filesUpload(mistral, { | ||
| file: await openAsBlob("./sample-file"), | ||
| }); | ||
|
|
||
| switch (true) { | ||
| case res.ok: | ||
| // The success case will be handled outside of the switch block | ||
| break; | ||
| case res.error instanceof SDKValidationError: | ||
| // Pretty-print validation errors. | ||
| return console.log(res.error.pretty()); | ||
| case res.error instanceof Error: | ||
| return console.log(res.error); | ||
| default: | ||
| // TypeScript's type checking will fail on the following line if the above | ||
| // cases were not exhaustive. | ||
| res.error satisfies never; | ||
| throw new Error("Assertion failed: expected error checks to be exhaustive: " + res.error); | ||
| } | ||
|
|
||
|
|
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| const { value: result } = res; | ||
|
|
||
| // Handle the result | ||
| console.log(result) | ||
| } | ||
|
|
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| run(); | ||
| ``` | ||
|
|
||
| ## Result types | ||
|
|
||
| Standalone functions differ from SDK methods in that they return a | ||
| `Result<Value, Error>` type to capture _known errors_ and document them using | ||
| the type system. By avoiding throwing errors, application code maintains clear | ||
| control flow and error-handling become part of the regular flow of application | ||
| code. | ||
|
|
||
| > We use the term "known errors" because standalone functions, and JavaScript | ||
| > code in general, can still throw unexpected errors such as `TypeError`s, | ||
| > `RangeError`s and `DOMException`s. Exhaustively catching all errors may be | ||
| > something this SDK addresses in the future. Nevertheless, there is still a lot | ||
| > of benefit from capturing most errors and turning them into values. | ||
| The second reason for this style of programming is because these functions will | ||
| typically be used in front-end applications where exception throwing is | ||
| sometimes discouraged or considered unidiomatic. React and similar ecosystems | ||
| and libraries tend to promote this style of programming so that components | ||
| render useful content under all states (loading, success, error and so on). | ||
|
|
||
| The general pattern when calling standalone functions looks like this: | ||
|
|
||
| ```typescript | ||
| import { Core } from "<sdk-package-name>"; | ||
| import { fetchSomething } from "<sdk-package-name>/funcs/fetchSomething.js"; | ||
|
|
||
| const client = new Core(); | ||
|
|
||
| async function run() { | ||
| const result = await fetchSomething(client, { id: "123" }); | ||
| if (!result.ok) { | ||
| // You can throw the error or handle it. It's your choice now. | ||
| throw result.error; | ||
| } | ||
|
|
||
| console.log(result.value); | ||
| } | ||
|
|
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| run(); | ||
| ``` | ||
|
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||
| Notably, `result.error` above will have an explicit type compared to a try-catch | ||
| variation where the error in the catch block can only be of type `unknown` (or | ||
| `any` depending on your TypeScript settings). |
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