chore: sync strict TypeScript compiler flags from deepnote/deepnote

[jamesbhobbs]

chore: sync strict TypeScript compiler flags from deepnote/deepnote

Summary

Adds two strict TypeScript compiler flags to align jupyterlab-deepnote's configuration with deepnote/deepnote:

• forceConsistentCasingInFileNames: Ensures import paths match exact file casing (helps catch cross-platform issues)
• skipLibCheck: Skips type checking of declaration files for faster builds

This is part of a broader effort to synchronize tooling configurations across deepnote/deepnote, jupyterlab-deepnote, and vscode-deepnote repositories.

Review & Testing Checklist for Human

• Verify flag selection: Confirm these are the correct flags to sync from deepnote/deepnote's tsconfig.json (no other important differences missed)
• CI validation: Ensure all CI checks pass, particularly TypeScript compilation and any downstream build processes
• Integration testing: Test that the extension still builds and loads correctly in JupyterLab after the changes

Notes

• Local build and test suite passed successfully with these changes
• Part of multi-repo configuration sync effort (lint-staged completed, tsconfig in progress, lint/format configs next)
• Link to Devin run: https://app.devin.ai/sessions/145f89c8cbc942d2970c5bc43a90149c
• Requested by: @jamesbhobbs

Summary by CodeRabbit

• Chores
  • Updated TypeScript configuration to improve build reliability and cross-platform consistency by enforcing consistent file name casing.
  • Optimized developer experience and build times by skipping type checks for external library declarations.
  • No changes to application functionality or user-facing behavior; these updates target development workflow and stability.

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📝 Walkthrough

Walkthrough

Added two TypeScript compiler options in tsconfig.json: forceConsistentCasingInFileNames (enforces consistent file name casing) and skipLibCheck (skips type-checking of .d.ts from libraries). No changes to code or exported APIs; only compiler configuration and error-checking behavior updated.

Possibly related PRs

• ci: add typecheck to CI workflow vscode-deepnote#36: Introduces a CI “typecheck” step that will be directly influenced by the new tsconfig options.

Suggested reviewers

• Artmann
• saltenasl
• andyjakubowski

Pre-merge checks

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The title clearly describes the synchronization of TypeScript compiler flags with the upstream deepnote/deepnote repository, which matches the changes present in the tsconfig.json file. It is concise and specific regarding the nature of the change. It informs reviewers of the chore nature and the source of configuration updates without unnecessary detail.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

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📜 Recent review details

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Review profile: ASSERTIVE

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between b865e79 and 03ccc48.

📒 Files selected for processing (1)

• tsconfig.json (2 hunks)

🧰 Additional context used

🧠 Learnings (1)

📓 Common learnings

Learnt from: CR
PR: deepnote/deepnote-internal#0
File: CONVENTIONS.md:0-0
Timestamp: 2025-09-30T12:33:33.332Z
Learning: Applies to **/*.{ts,tsx} : Boolean options are non-nullable; other options generally nullable

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (3)

• GitHub Check: build
• GitHub Check: Lint & Format
• GitHub Check: check_release

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 18.50%. Comparing base (88fd175) to head (e5fdca9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #23   +/-   ##
=======================================
  Coverage   18.50%   18.50%           
=======================================
  Files          13       13           
  Lines         200      200           
  Branches       27       27           
=======================================
  Hits           37       37           
  Misses        163      163           

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