refactor(utils): migrate fields and timestamp tests from Flow to Type…

[bonchevskyi]

Summary

This PR finishes the remaining utils migration tail on master: fields from Flow (.js) to TypeScript (.ts), plus renaming timestamp tests to TypeScript. Disjoint from other in-flight utils PRs.

Migrated utilities

• fields

Tests migrated (impl already TypeScript)

• timestamp — timestamp.test.js → timestamp.test.ts (no change to timestamp.ts)

Components / API modules touched (consumers)

No import path changes expected. fields exports field-fetch constants and helpers (fillMissingProperties, fillUserPlaceholder, findMissingProperties, etc.) used across API/Elements code paths.

Changes

• Converted fields.js to fields.ts and added fields.js.flow for remaining Flow importers
• Renamed fields.test.js → fields.test.ts
• Renamed timestamp.test.js → timestamp.test.ts

Contract

• Declared Flow contract and runtime behavior preserved for fields (exports and helper logic unchanged relative to the previous .js source)

Related

• Disjoint from other utils migration PRs (batch 1–6: Browser/Cache/… through Xhr, uploads, etc.)
• After all utils branches merge, only .js.flow stubs (and optional __mocks__/performance.js) remain under src/utils/ for Flow compatibility

Summary by CodeRabbit

• New Features

  • Added comprehensive field-selection support for folders, sidebars, previews, file versions, shared links, tasks, comments, users, activity, and uploaders.
  • Added support for archive-specific field selections.
  • Added handling for missing data and unavailable user references to improve data consistency.

• Tests

  • Updated timestamp validation tests while preserving expected handling of invalid input.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 5512abe2-9007-42ac-a76d-4395e6779e86

📥 Commits

Reviewing files that changed from the base of the PR and between a4ca178 and b9996e6.

📒 Files selected for processing (4)

• src/utils/__tests__/fields.test.ts
• src/utils/__tests__/timestamp.test.ts
• src/utils/fields.js.flow
• src/utils/fields.ts

Included review availability: Your plan provides up to 4 included reviews per hour; 0 remain after this review.

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Walkthrough

The change adds exported field-selection collections and property-normalization helpers in src/utils/fields.ts. It also updates invalid timestamp test arguments with explicit number casts.

Changes

Field utilities

Layer / File(s)	Summary
Field selection collections src/utils/fields.ts	Adds field collections for folders, sidebars, previews, file versions, shared links, tasks, comments, users, activity, and uploaders, including archive variants.
Property normalization helpers src/utils/fields.ts	Adds helpers to find missing properties, fill missing nested properties with null, and replace null user references with PLACEHOLDER_USER. Exports the collections and helpers.
Timestamp test typing src/utils/__tests__/timestamp.test.ts	Casts invalid string inputs to number while preserving expected results of 0.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Refactor

Suggested reviewers: greg-in-a-box

Merge Risk: ⚪ Minimal · up to b9996

The TypeScript migration preserves the utility and test contracts with no actionable regression identified.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main changes: migrating the fields utility and timestamp tests from Flow JavaScript to TypeScript.
Description check	✅ Passed	The description is complete and relevant. It explains the migration scope, renamed files, compatibility contract, affected consumers, and related work. The repository template contains only informatio…
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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_{I nudge each field into its place
With nulls aligned in tidy space
A placeholder guards the user trail
Archive paths now list their detail
The rabbit hops through tests with care}

_{Comment @coderabbitai help to get the list of available commands.}

[greg-in-a-box]

Review

Straightforward Flow → TypeScript migration of fields, plus renaming the timestamp tests to .ts, consistent with the other utils migration batches.

What looks good

• Export surface matches master; field-fetch constant arrays and helper logic are preserved (function → const arrow, docs trimmed).
• .js.flow stub via rename matches the established migration pattern for remaining Flow importers.
• findMissingProperties / fillMissingProperties optional-param tidy (properties?: → properties with default; obj?: → obj with default) is type-only; runtime defaults behave the same.
• timestamp.test.ts casts (as unknown as number) correctly exercise the non-number path of convertTimestampToSeconds under TypeScript.

Nits (non-blocking)

• CI (lint_test_build) was still in progress at review time — worth confirming green before merge.

Verdict: Approve.

[greg-in-a-box]

Review

Mechanical Flow → TypeScript migration of fields, plus renaming the timestamp tests. Looks good to merge from a contract/behavior standpoint.

Checked

• Field-list constants (including archive variants) match master fields.js one-for-one.
• findMissingProperties / fillMissingProperties / fillUserPlaceholder logic and exports are unchanged.
• fields.js → fields.js.flow keeps the full Flow copy for remaining Flow importers, consistent with the other in-flight utils migrations.
• fields.test.js → .ts is a rename-only; timestamp.test.ts only adds the casts needed for convertTimestampToSeconds(timestamp: number).

Nits (non-blocking)

• Helpers still use Flow-era Object / Array<string>; fine for this pass, but a later cleanup could tighten to Record<string, unknown> (or a shared shape) if you want real TS value from the types.
• as unknown as number in the timestamp invalid-input cases is clear enough; @ts-expect-error would also document intent if you prefer that style.

Approving.