refactor(utils): migrate Xhr from Flow to TypeScript

[bonchevskyi]

Summary

This PR migrates the Xhr network utility in src/utils from Flow (.js) to TypeScript (.ts), disjoint from other utils migration PRs.

Migrated utilities

• Xhr

Components / API modules touched (consumers)

No import path changes expected. Xhr remains the default export from utils/Xhr and is used widely across Elements/API layers (axios client, token headers, retries, upload timeouts).

Changes

• Converted Xhr.js to Xhr.ts (class preserved; axios typings replace Flow $Axios* types)
• Added Xhr.js.flow stub for remaining Flow importers
• Renamed src/utils/__tests__/Xhr.test.js → Xhr.test.ts

Contract

• Declared Flow contract and runtime behavior preserved (constructor options, public methods, retry/rate-limit behavior, and default export unchanged relative to the previous .js source)

Related

• Disjoint from other utils migration PRs:
  • Batch 1: Browser, Cache, LocalStore, TokenService
  • Batch 2: webcrypto, error, file, function, flatten, fuzzySearch, domPolyfill, getFileSize, validators
  • Batch 3: base64, comparator, download, env, hex, keys, parseCSV, parseEmails, performance, relativeTime, sleep, storybook, url
  • Batch 4 (dom-theme): createTheme, dom, iframe, sorter
  • Batch 5 (uploads): uploads, uploadsSHA1Worker

Summary by CodeRabbit

• New Features
  • Added support for uploading files with progress tracking and automatic cancellation after extended inactivity.
  • Added the ability to cancel in-progress requests.
  • Added support for standard GET, POST, PUT, DELETE, and OPTIONS requests.
• Bug Fixes
  • Improved reliability for temporary network failures and rate-limit responses through automatic retries.
  • Standardized request authentication, language, and client information across supported operations.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

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📥 Commits

Reviewing files that changed from the base of the PR and between cc83fab and 24e2dfe.

📒 Files selected for processing (2)

• src/utils/Xhr.js.flow
• src/utils/Xhr.ts

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Walkthrough

The pull request adds an axios-based Xhr client with authenticated requests, retries, cancellation, standard HTTP methods, file uploads, progress callbacks, and idle-timeout handling. It also updates the options type and test mocks.

Changes

Xhr client

Layer / File(s)	Summary
Request foundation src/utils/Xhr.ts, src/utils/Xhr.js.flow, src/utils/__tests__/Xhr.test.ts	Adds the Xhr class, axios state, URL and header construction, authentication, standard HTTP methods, OPTIONS handling, and related type and mock updates.
Retry and cancellation src/utils/Xhr.ts, src/utils/__tests__/Xhr.test.ts	Retries eligible network and HTTP failures with exponential backoff and jitter. Final errors reach the response interceptor. abort clears retry timers and resets the cancellation source.
File upload and idle timeout src/utils/Xhr.ts	Adds POST and PUT uploads, FormData conversion, progress callbacks, shared cancellation, and optional 120000 ms idle-timeout handling.

Priority: ➖ Normal

Estimated code review effort: 4 (Complex) | ~45 minutes

Change: Refactor

Sequence Diagram(s)

sequenceDiagram
  participant Caller
  participant Xhr
  participant TokenService
  participant Axios
  Caller->>Xhr: invoke request
  Xhr->>TokenService: resolve token
  TokenService-->>Xhr: return token
  Xhr->>Axios: send authenticated request
  Axios-->>Xhr: return response or retryable error
  Xhr->>Axios: retry after exponential backoff

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Suggested reviewers: jfox-box

Merge Risk: 🟡 Moderate · up to 24e2d

The TypeScript Xhr migration preserves the OPTIONS behavior, but its return annotation does not match the callback result and may fail type checking. Correct this mismatch before merging.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely identifies the main change: migrating Xhr from Flow to TypeScript.
Description check	✅ Passed	The description explains the migration scope, preserved behavior, affected files, consumer impact, and related work. It provides sufficient context for review.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create a new PR

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_{A rabbit checks each header line,
Retry paths align in time,
Uploads hop with files in tow,
Cancel tokens stop the flow,
Tests keep the Xhr garden bright.}

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[greg-in-a-box]

Review

Clean Flow → TypeScript migration of Xhr, consistent with the other utils batches. Runtime behavior looks preserved (retry/backoff, headers/token, upload idle timeout, abort/cancel token reset). Renaming the old source to Xhr.js.flow and adding Xhr.ts matches the established pattern; test rename + jest mock typing are appropriate.

Verdict: Approve

Nits only (non-blocking):

• Prefer import type { AxiosInstance, AxiosRequestConfig, AxiosResponse, CancelTokenSource } (keep AxiosError as a value import if you rely on it at runtime) so type-only axios names stay erased under stricter TS settings.
• errorObject as AxiosResponse in errorInterceptor papers over the existing “pass response.data or the error into the response interceptor” contract — accurate to today’s runtime, but a future typed interceptor may want a wider parameter type instead of the cast.

No material correctness, regression, a11y, or test gaps for merge from this migration.

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
In `@src/utils/Xhr.ts`:
- Line 379: Update the return type of the options method near successHandler and
errorHandler from Promise<StringAnyMap> to Promise<void>, matching the void
result produced by the promise chain.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 9cd559d4-7850-4af7-b180-4eb233418a4f

📥 Commits

Reviewing files that changed from the base of the PR and between a4ca178 and cc83fab.

📒 Files selected for processing (3)

• src/utils/Xhr.js.flow
• src/utils/Xhr.ts
• src/utils/__tests__/Xhr.test.ts

Included review availability: Your plan provides up to 4 included reviews per hour; 1 remains after this review.