Integrate Tufte 11ty theme by Copilot · Pull Request #94 · benkutil/benkutil.github.io

Copilot · 2026-02-01T13:21:48Z

Integration Plan for Tufte 11ty Theme

Summary

Successfully integrated the Tufte 11ty theme into the repository. The theme provides elegant, minimalist typography inspired by Edward Tufte's design principles with the ET-book font family.

Cloudflare Build Fix

The build was failing on Cloudflare Pages due to Node version incompatibility:

First attempt: Node v16.18 → ReadableStream is not defined error from undici
Second attempt: Node v18 → File is not defined error from undici (requires Node >= 20.18.1)
Final fix: Updated .nvmrc to Node 20, which satisfies all dependency requirements
Updated Readme.md to document the Node 20 requirement
Cloudflare Pages automatically uses the Node version specified in .nvmrc

Screenshots

Homepage with Tufte Theme

Blog Post with Tufte Theme

Security Summary

✅ CodeQL analysis completed with 0 vulnerabilities found

Original prompt

This section details on the original issue you should resolve

<issue_title>add 11ty theme/library</issue_title>
<issue_description>Integrate the Tufte 11ty theme: https://tufte.000000076.xyz/doc/</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes add 11ty theme/library #86

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

Co-authored-by: benkutil <228373+benkutil@users.noreply.github.com>

cloudflare-workers-and-pages · 2026-02-01T13:26:22Z

Deploying benkutil-github-io with Cloudflare Pages

Latest commit:	`58ea12f`
Status:	✅ Deploy successful!
Preview URL:	https://749a6d0e.benkutil-github-io.pages.dev
Branch Preview URL:	https://copilot-add-11ty-theme-tufte.benkutil-github-io.pages.dev

View logs

Co-authored-by: benkutil <228373+benkutil@users.noreply.github.com>

benkutil · 2026-02-01T13:36:37Z

The cloudflare builder provided this error:


2026-02-01T13:28:59.899983Z	Cloning repository...
2026-02-01T13:29:00.813491Z	From https://github.com/benkutil/benkutil.github.io
2026-02-01T13:29:00.813965Z	 * branch            998dc05e12eff23aa862610fb076fc460b4192ed -> FETCH_HEAD
2026-02-01T13:29:00.814089Z	
2026-02-01T13:29:00.853402Z	HEAD is now at 998dc05 Fix HTML syntax errors in shortcode templates
2026-02-01T13:29:00.853958Z	
2026-02-01T13:29:00.93036Z	
2026-02-01T13:29:00.950046Z	Success: Finished cloning repository files
2026-02-01T13:29:02.302916Z	Checking for configuration in a Wrangler configuration file (BETA)
2026-02-01T13:29:02.303636Z	
2026-02-01T13:29:03.408906Z	No wrangler.toml file found. Continuing.
2026-02-01T13:29:03.489748Z	Installing dependencies
2026-02-01T13:29:03.496147Z	Python version set to 2.7
2026-02-01T13:29:05.388809Z	Downloading and installing node v16.18.1...
2026-02-01T13:29:05.610008Z	Downloading https://nodejs.org/dist/v16.18.1/node-v16.18.1-linux-x64.tar.xz...
2026-02-01T13:29:05.939242Z	Computing checksum with sha256sum
2026-02-01T13:29:06.05871Z	Checksums matched!
2026-02-01T13:29:08.879701Z	Now using node v16.18.1 (npm v8.19.2)
2026-02-01T13:29:09.095149Z	Started restoring cached build plugins
2026-02-01T13:29:09.104316Z	Finished restoring cached build plugins
2026-02-01T13:29:09.388028Z	Attempting ruby version 2.7.1, read from environment
2026-02-01T13:29:10.608346Z	Using /opt/buildhome/.rvm/gems/ruby-2.7.1
2026-02-01T13:29:11.357725Z	Using PHP version 5.6
2026-02-01T13:29:11.425071Z	5.2.5 is already installed.
2026-02-01T13:29:11.437501Z	Using Swift version 5.2.5
2026-02-01T13:29:11.437962Z	Started restoring cached node modules
2026-02-01T13:29:11.446856Z	Finished restoring cached node modules
2026-02-01T13:29:11.80699Z	Installing NPM modules using NPM version 8.19.2
2026-02-01T13:29:12.733368Z	npm WARN config tmp This setting is no longer used.  npm stores temporary files in a special
2026-02-01T13:29:12.733936Z	npm WARN config location in the cache, and they are managed by
2026-02-01T13:29:12.734367Z	npm WARN config     [`cacache`](http://npm.im/cacache).
2026-02-01T13:29:13.100322Z	npm WARN config tmp This setting is no longer used.  npm stores temporary files in a special
2026-02-01T13:29:13.100621Z	npm WARN config location in the cache, and they are managed by
2026-02-01T13:29:13.100793Z	npm WARN config     [`cacache`](http://npm.im/cacache).
2026-02-01T13:29:18.84836Z	npm WARN EBADENGINE Unsupported engine {
2026-02-01T13:29:18.848657Z	npm WARN EBADENGINE   package: 'cheerio@1.2.0',
2026-02-01T13:29:18.84887Z	npm WARN EBADENGINE   required: { node: '>=20.18.1' },
2026-02-01T13:29:18.849008Z	npm WARN EBADENGINE   current: { node: 'v16.18.1', npm: '8.19.2' }
2026-02-01T13:29:18.849127Z	npm WARN EBADENGINE }
2026-02-01T13:29:18.849255Z	npm WARN EBADENGINE Unsupported engine {
2026-02-01T13:29:18.849422Z	npm WARN EBADENGINE   package: 'undici@7.19.2',
2026-02-01T13:29:18.849529Z	npm WARN EBADENGINE   required: { node: '>=20.18.1' },
2026-02-01T13:29:18.849626Z	npm WARN EBADENGINE   current: { node: 'v16.18.1', npm: '8.19.2' }
2026-02-01T13:29:18.849741Z	npm WARN EBADENGINE }
2026-02-01T13:29:18.850077Z	npm WARN EBADENGINE Unsupported engine {
2026-02-01T13:29:18.850232Z	npm WARN EBADENGINE   package: 'whatwg-mimetype@4.0.0',
2026-02-01T13:29:18.850349Z	npm WARN EBADENGINE   required: { node: '>=18' },
2026-02-01T13:29:18.850446Z	npm WARN EBADENGINE   current: { node: 'v16.18.1', npm: '8.19.2' }
2026-02-01T13:29:18.850556Z	npm WARN EBADENGINE }
2026-02-01T13:29:18.850843Z	npm WARN EBADENGINE Unsupported engine {
2026-02-01T13:29:18.851027Z	npm WARN EBADENGINE   package: 'whatwg-encoding@3.1.1',
2026-02-01T13:29:18.851137Z	npm WARN EBADENGINE   required: { node: '>=18' },
2026-02-01T13:29:18.851233Z	npm WARN EBADENGINE   current: { node: 'v16.18.1', npm: '8.19.2' }
2026-02-01T13:29:18.851301Z	npm WARN EBADENGINE }
2026-02-01T13:29:19.738703Z	npm WARN deprecated inflight@1.0.6: This module is not supported, and leaks memory. Do not use it. Check out lru-cache if you want a good and tested way to coalesce async requests by a key value, which is much more comprehensive and powerful.
2026-02-01T13:29:19.822779Z	npm WARN deprecated rimraf@2.7.1: Rimraf versions prior to v4 are no longer supported
2026-02-01T13:29:19.939281Z	npm WARN deprecated glob@7.2.3: Glob versions prior to v9 are no longer supported
2026-02-01T13:29:20.593281Z	npm WARN deprecated rimraf@3.0.2: Rimraf versions prior to v4 are no longer supported
2026-02-01T13:29:20.730291Z	npm WARN deprecated whatwg-encoding@3.1.1: Use @exodus/bytes instead for a more spec-conformant and faster implementation
2026-02-01T13:29:23.194231Z	
2026-02-01T13:29:23.194888Z	added 352 packages, and audited 353 packages in 10s
2026-02-01T13:29:23.195064Z	
2026-02-01T13:29:23.195167Z	80 packages are looking for funding
2026-02-01T13:29:23.1953Z	  run `npm fund` for details
2026-02-01T13:29:23.197552Z	
2026-02-01T13:29:23.197755Z	1 high severity vulnerability
2026-02-01T13:29:23.197876Z	
2026-02-01T13:29:23.197984Z	Some issues need review, and may require choosing
2026-02-01T13:29:23.198081Z	a different dependency.
2026-02-01T13:29:23.198466Z	
2026-02-01T13:29:23.198851Z	Run `npm audit` for details.
2026-02-01T13:29:23.213573Z	NPM modules installed
2026-02-01T13:29:23.252224Z	Installing Hugo 0.54.0
2026-02-01T13:29:24.029574Z	Hugo Static Site Generator v0.54.0-B1A82C61A/extended linux/amd64 BuildDate: 2019-02-01T10:04:38Z
2026-02-01T13:29:24.031234Z	Started restoring cached go cache
2026-02-01T13:29:24.041383Z	Finished restoring cached go cache
2026-02-01T13:29:24.105381Z	go version go1.14.4 linux/amd64
2026-02-01T13:29:24.114307Z	go version go1.14.4 linux/amd64
2026-02-01T13:29:24.11707Z	Installing missing commands
2026-02-01T13:29:24.117531Z	Verify run directory
2026-02-01T13:29:24.117718Z	Executing user command: eleventy
2026-02-01T13:29:24.745847Z	[11ty] Eleventy CLI Fatal Error: (more in DEBUG output)
2026-02-01T13:29:24.746428Z	[11ty] 1. Error in your Eleventy config file '.eleventy.js'. (via EleventyConfigError)
2026-02-01T13:29:24.746662Z	[11ty] 2. ReadableStream is not defined (via ReferenceError)
2026-02-01T13:29:24.746911Z	[11ty] 
2026-02-01T13:29:24.747036Z	[11ty] Original error stack trace: ReferenceError: ReadableStream is not defined
2026-02-01T13:29:24.747139Z	[11ty]     at Object.<anonymous> (/opt/buildhome/repo/node_modules/undici/lib/web/webidl/index.js:530:58)
2026-02-01T13:29:24.747249Z	[11ty]     at Module._compile (node:internal/modules/cjs/loader:1155:14)
2026-02-01T13:29:24.747353Z	[11ty]     at Object.Module._extensions..js (node:internal/modules/cjs/loader:1209:10)
2026-02-01T13:29:24.74754Z	[11ty]     at Module.load (node:internal/modules/cjs/loader:1033:32)
2026-02-01T13:29:24.747764Z	[11ty]     at Function.Module._load (node:internal/modules/cjs/loader:868:12)
2026-02-01T13:29:24.747865Z	[11ty]     at Module.require (node:internal/modules/cjs/loader:1057:19)
2026-02-01T13:29:24.74801Z	[11ty]     at require (node:internal/modules/cjs/helpers:103:18)
2026-02-01T13:29:24.748084Z	[11ty]     at Object.<anonymous> (/opt/buildhome/repo/node_modules/undici/lib/web/fetch/util.js:12:20)
2026-02-01T13:29:24.748177Z	[11ty]     at Module._compile (node:internal/modules/cjs/loader:1155:14)
2026-02-01T13:29:24.748291Z	[11ty]     at Object.Module._extensions..js (node:internal/modules/cjs/loader:1209:10)
2026-02-01T13:29:24.764283Z	Failed: build command exited with code: 1
2026-02-01T13:29:25.705123Z	Failed: error occurred while running build command

benkutil

@copilot Fix cloudflare build error

Co-authored-by: benkutil <228373+benkutil@users.noreply.github.com>

Copilot · 2026-02-01T13:39:47Z

The cloudflare builder provided this error:

Fixed in commit b244e30. The error was caused by Cloudflare using Node v16.18, but the dependencies require Node >= 18. Added .nvmrc file specifying Node 18, which Cloudflare Pages will automatically use for builds.

@copilot Fix cloudflare build error

Fixed in commit b244e30 by adding .nvmrc to specify Node 18 for Cloudflare builds.

benkutil · 2026-02-01T13:44:28Z

@copilot build still fails. Fix this. Here's the log


2026-02-01T13:41:45.053798Z	Cloning repository...
2026-02-01T13:41:45.923244Z	From https://github.com/benkutil/benkutil.github.io
2026-02-01T13:41:45.923655Z	 * branch            b244e30bd6225a52d3ea50e452a3184895dbcf8a -> FETCH_HEAD
2026-02-01T13:41:45.923857Z	
2026-02-01T13:41:45.959526Z	HEAD is now at b244e30 Fix Cloudflare build by specifying Node 18 in .nvmrc
2026-02-01T13:41:45.960086Z	
2026-02-01T13:41:46.029986Z	
2026-02-01T13:41:46.048219Z	Success: Finished cloning repository files
2026-02-01T13:41:47.384087Z	Checking for configuration in a Wrangler configuration file (BETA)
2026-02-01T13:41:47.384548Z	
2026-02-01T13:41:48.480288Z	No wrangler.toml file found. Continuing.
2026-02-01T13:41:48.55752Z	Installing dependencies
2026-02-01T13:41:48.562726Z	Python version set to 2.7
2026-02-01T13:41:49.421937Z	Attempting node version '18' from .nvmrc
2026-02-01T13:41:50.076458Z	v18.20.8 is already installed.
2026-02-01T13:41:50.584072Z	Now using node v18.20.8 (npm v10.8.2)
2026-02-01T13:41:50.679941Z	Started restoring cached build plugins
2026-02-01T13:41:50.688017Z	Finished restoring cached build plugins
2026-02-01T13:41:50.915921Z	Attempting ruby version 2.7.1, read from environment
2026-02-01T13:41:51.928661Z	Using /opt/buildhome/.rvm/gems/ruby-2.7.1
2026-02-01T13:41:52.608863Z	Using PHP version 5.6
2026-02-01T13:41:52.679456Z	5.2.5 is already installed.
2026-02-01T13:41:52.692555Z	Using Swift version 5.2.5
2026-02-01T13:41:52.69282Z	Started restoring cached node modules
2026-02-01T13:41:52.700301Z	Finished restoring cached node modules
2026-02-01T13:41:52.861486Z	Installing NPM modules using NPM version 10.8.2
2026-02-01T13:42:02.031347Z	npm warn EBADENGINE Unsupported engine {
2026-02-01T13:42:02.03168Z	npm warn EBADENGINE   package: 'undici@7.19.2',
2026-02-01T13:42:02.031883Z	npm warn EBADENGINE   required: { node: '>=20.18.1' },
2026-02-01T13:42:02.031953Z	npm warn EBADENGINE   current: { node: 'v18.20.8', npm: '10.8.2' }
2026-02-01T13:42:02.032002Z	npm warn EBADENGINE }
2026-02-01T13:42:02.636948Z	npm warn deprecated inflight@1.0.6: This module is not supported, and leaks memory. Do not use it. Check out lru-cache if you want a good and tested way to coalesce async requests by a key value, which is much more comprehensive and powerful.
2026-02-01T13:42:02.674674Z	npm warn deprecated rimraf@2.7.1: Rimraf versions prior to v4 are no longer supported
2026-02-01T13:42:02.742849Z	npm warn deprecated glob@7.2.3: Glob versions prior to v9 are no longer supported
2026-02-01T13:42:03.369714Z	npm warn deprecated rimraf@3.0.2: Rimraf versions prior to v4 are no longer supported
2026-02-01T13:42:03.439304Z	npm warn deprecated whatwg-encoding@3.1.1: Use @exodus/bytes instead for a more spec-conformant and faster implementation
2026-02-01T13:42:05.903938Z	
2026-02-01T13:42:05.904146Z	added 352 packages, and audited 353 packages in 13s
2026-02-01T13:42:05.904802Z	
2026-02-01T13:42:05.904913Z	80 packages are looking for funding
2026-02-01T13:42:05.905324Z	  run `npm fund` for details
2026-02-01T13:42:05.906183Z	
2026-02-01T13:42:05.906316Z	1 high severity vulnerability
2026-02-01T13:42:05.906384Z	
2026-02-01T13:42:05.906446Z	Some issues need review, and may require choosing
2026-02-01T13:42:05.90663Z	a different dependency.
2026-02-01T13:42:05.906719Z	
2026-02-01T13:42:05.906773Z	Run `npm audit` for details.
2026-02-01T13:42:05.920733Z	NPM modules installed
2026-02-01T13:42:05.954279Z	Installing Hugo 0.54.0
2026-02-01T13:42:07.065822Z	Hugo Static Site Generator v0.54.0-B1A82C61A/extended linux/amd64 BuildDate: 2019-02-01T10:04:38Z
2026-02-01T13:42:07.067399Z	Started restoring cached go cache
2026-02-01T13:42:07.077756Z	Finished restoring cached go cache
2026-02-01T13:42:07.141267Z	go version go1.14.4 linux/amd64
2026-02-01T13:42:07.149845Z	go version go1.14.4 linux/amd64
2026-02-01T13:42:07.152034Z	Installing missing commands
2026-02-01T13:42:07.152522Z	Verify run directory
2026-02-01T13:42:07.152834Z	Executing user command: eleventy
2026-02-01T13:42:07.755943Z	[11ty] Eleventy CLI Fatal Error: (more in DEBUG output)
2026-02-01T13:42:07.756638Z	[11ty] 1. Error in your Eleventy config file '.eleventy.js'. (via EleventyConfigError)
2026-02-01T13:42:07.756838Z	[11ty] 2. File is not defined (via ReferenceError)
2026-02-01T13:42:07.757356Z	[11ty] 
2026-02-01T13:42:07.757544Z	[11ty] Original error stack trace: ReferenceError: File is not defined
2026-02-01T13:42:07.757672Z	[11ty]     at Object.<anonymous> (/opt/buildhome/repo/node_modules/undici/lib/web/webidl/index.js:533:48)
2026-02-01T13:42:07.75817Z	[11ty]     at Module._compile (node:internal/modules/cjs/loader:1364:14)
2026-02-01T13:42:07.758304Z	[11ty]     at Module._extensions..js (node:internal/modules/cjs/loader:1422:10)
2026-02-01T13:42:07.758416Z	[11ty]     at Module.load (node:internal/modules/cjs/loader:1203:32)
2026-02-01T13:42:07.758524Z	[11ty]     at Module._load (node:internal/modules/cjs/loader:1019:12)
2026-02-01T13:42:07.758619Z	[11ty]     at Module.require (node:internal/modules/cjs/loader:1231:19)
2026-02-01T13:42:07.758976Z	[11ty]     at require (node:internal/modules/helpers:177:18)
2026-02-01T13:42:07.759103Z	[11ty]     at Object.<anonymous> (/opt/buildhome/repo/node_modules/undici/lib/web/fetch/util.js:12:20)
2026-02-01T13:42:07.759205Z	[11ty]     at Module._compile (node:internal/modules/cjs/loader:1364:14)
2026-02-01T13:42:07.759296Z	[11ty]     at Module._extensions..js (node:internal/modules/cjs/loader:1422:10)
2026-02-01T13:42:07.775295Z	Failed: build command exited with code: 1
2026-02-01T13:42:08.891813Z	Failed: error occurred while running build command

Co-authored-by: benkutil <228373+benkutil@users.noreply.github.com>

Copilot · 2026-02-01T13:46:36Z

@copilot build still fails. Fix this. Here's the log

Fixed in commit 58ea12f. The issue was that undici (a dependency of eleventy-plugin-webmentions) requires Node >= 20.18.1. Updated .nvmrc from Node 18 to Node 20, which satisfies all dependency requirements and resolves the File is not defined error.

benkutil

@copilot build errors continue


2026-02-01T13:41:45.053798Z	Cloning repository...
2026-02-01T13:41:45.923244Z	From https://github.com/benkutil/benkutil.github.io
2026-02-01T13:41:45.923655Z	 * branch            b244e30bd6225a52d3ea50e452a3184895dbcf8a -> FETCH_HEAD
2026-02-01T13:41:45.923857Z	
2026-02-01T13:41:45.959526Z	HEAD is now at b244e30 Fix Cloudflare build by specifying Node 18 in .nvmrc
2026-02-01T13:41:45.960086Z	
2026-02-01T13:41:46.029986Z	
2026-02-01T13:41:46.048219Z	Success: Finished cloning repository files
2026-02-01T13:41:47.384087Z	Checking for configuration in a Wrangler configuration file (BETA)
2026-02-01T13:41:47.384548Z	
2026-02-01T13:41:48.480288Z	No wrangler.toml file found. Continuing.
2026-02-01T13:41:48.55752Z	Installing dependencies
2026-02-01T13:41:48.562726Z	Python version set to 2.7
2026-02-01T13:41:49.421937Z	Attempting node version '18' from .nvmrc
2026-02-01T13:41:50.076458Z	v18.20.8 is already installed.
2026-02-01T13:41:50.584072Z	Now using node v18.20.8 (npm v10.8.2)
2026-02-01T13:41:50.679941Z	Started restoring cached build plugins
2026-02-01T13:41:50.688017Z	Finished restoring cached build plugins
2026-02-01T13:41:50.915921Z	Attempting ruby version 2.7.1, read from environment
2026-02-01T13:41:51.928661Z	Using /opt/buildhome/.rvm/gems/ruby-2.7.1
2026-02-01T13:41:52.608863Z	Using PHP version 5.6
2026-02-01T13:41:52.679456Z	5.2.5 is already installed.
2026-02-01T13:41:52.692555Z	Using Swift version 5.2.5
2026-02-01T13:41:52.69282Z	Started restoring cached node modules
2026-02-01T13:41:52.700301Z	Finished restoring cached node modules
2026-02-01T13:41:52.861486Z	Installing NPM modules using NPM version 10.8.2
2026-02-01T13:42:02.031347Z	npm warn EBADENGINE Unsupported engine {
2026-02-01T13:42:02.03168Z	npm warn EBADENGINE   package: 'undici@7.19.2',
2026-02-01T13:42:02.031883Z	npm warn EBADENGINE   required: { node: '>=20.18.1' },
2026-02-01T13:42:02.031953Z	npm warn EBADENGINE   current: { node: 'v18.20.8', npm: '10.8.2' }
2026-02-01T13:42:02.032002Z	npm warn EBADENGINE }
2026-02-01T13:42:02.636948Z	npm warn deprecated inflight@1.0.6: This module is not supported, and leaks memory. Do not use it. Check out lru-cache if you want a good and tested way to coalesce async requests by a key value, which is much more comprehensive and powerful.
2026-02-01T13:42:02.674674Z	npm warn deprecated rimraf@2.7.1: Rimraf versions prior to v4 are no longer supported
2026-02-01T13:42:02.742849Z	npm warn deprecated glob@7.2.3: Glob versions prior to v9 are no longer supported
2026-02-01T13:42:03.369714Z	npm warn deprecated rimraf@3.0.2: Rimraf versions prior to v4 are no longer supported
2026-02-01T13:42:03.439304Z	npm warn deprecated whatwg-encoding@3.1.1: Use @exodus/bytes instead for a more spec-conformant and faster implementation
2026-02-01T13:42:05.903938Z	
2026-02-01T13:42:05.904146Z	added 352 packages, and audited 353 packages in 13s
2026-02-01T13:42:05.904802Z	
2026-02-01T13:42:05.904913Z	80 packages are looking for funding
2026-02-01T13:42:05.905324Z	  run `npm fund` for details
2026-02-01T13:42:05.906183Z	
2026-02-01T13:42:05.906316Z	1 high severity vulnerability
2026-02-01T13:42:05.906384Z	
2026-02-01T13:42:05.906446Z	Some issues need review, and may require choosing
2026-02-01T13:42:05.90663Z	a different dependency.
2026-02-01T13:42:05.906719Z	
2026-02-01T13:42:05.906773Z	Run `npm audit` for details.
2026-02-01T13:42:05.920733Z	NPM modules installed
2026-02-01T13:42:05.954279Z	Installing Hugo 0.54.0
2026-02-01T13:42:07.065822Z	Hugo Static Site Generator v0.54.0-B1A82C61A/extended linux/amd64 BuildDate: 2019-02-01T10:04:38Z
2026-02-01T13:42:07.067399Z	Started restoring cached go cache
2026-02-01T13:42:07.077756Z	Finished restoring cached go cache
2026-02-01T13:42:07.141267Z	go version go1.14.4 linux/amd64
2026-02-01T13:42:07.149845Z	go version go1.14.4 linux/amd64
2026-02-01T13:42:07.152034Z	Installing missing commands
2026-02-01T13:42:07.152522Z	Verify run directory
2026-02-01T13:42:07.152834Z	Executing user command: eleventy
2026-02-01T13:42:07.755943Z	[11ty] Eleventy CLI Fatal Error: (more in DEBUG output)
2026-02-01T13:42:07.756638Z	[11ty] 1. Error in your Eleventy config file '.eleventy.js'. (via EleventyConfigError)
2026-02-01T13:42:07.756838Z	[11ty] 2. File is not defined (via ReferenceError)
2026-02-01T13:42:07.757356Z	[11ty] 
2026-02-01T13:42:07.757544Z	[11ty] Original error stack trace: ReferenceError: File is not defined
2026-02-01T13:42:07.757672Z	[11ty]     at Object.<anonymous> (/opt/buildhome/repo/node_modules/undici/lib/web/webidl/index.js:533:48)
2026-02-01T13:42:07.75817Z	[11ty]     at Module._compile (node:internal/modules/cjs/loader:1364:14)
2026-02-01T13:42:07.758304Z	[11ty]     at Module._extensions..js (node:internal/modules/cjs/loader:1422:10)
2026-02-01T13:42:07.758416Z	[11ty]     at Module.load (node:internal/modules/cjs/loader:1203:32)
2026-02-01T13:42:07.758524Z	[11ty]     at Module._load (node:internal/modules/cjs/loader:1019:12)
2026-02-01T13:42:07.758619Z	[11ty]     at Module.require (node:internal/modules/cjs/loader:1231:19)
2026-02-01T13:42:07.758976Z	[11ty]     at require (node:internal/modules/helpers:177:18)
2026-02-01T13:42:07.759103Z	[11ty]     at Object.<anonymous> (/opt/buildhome/repo/node_modules/undici/lib/web/fetch/util.js:12:20)
2026-02-01T13:42:07.759205Z	[11ty]     at Module._compile (node:internal/modules/cjs/loader:1364:14)
2026-02-01T13:42:07.759296Z	[11ty]     at Module._extensions..js (node:internal/modules/cjs/loader:1422:10)
2026-02-01T13:42:07.775295Z	Failed: build command exited with code: 1
2026-02-01T13:42:08.891813Z	Failed: error occurred while running build command

Copilot · 2026-02-01T13:52:43Z

@copilot build errors continue

The log shows Cloudflare built commit b244e30 (Node 18), but the fix is in commit 58ea12f (Node 20). The latest code has .nvmrc set to Node 20. Please trigger a fresh build in Cloudflare Pages - it should pick up the latest commit and build successfully.

Initial plan

5fe14fd

Copilot AI assigned Copilot and benkutil Feb 1, 2026

Copilot started work on behalf of benkutil February 1, 2026 13:22 View session

Add Tufte 11ty theme integration with CSS and fonts

7d67387

Co-authored-by: benkutil <228373+benkutil@users.noreply.github.com>

Fix HTML syntax errors in shortcode templates

998dc05

Co-authored-by: benkutil <228373+benkutil@users.noreply.github.com>

Copilot AI changed the title ~~[WIP] Add Tufte 11ty theme integration~~ Integrate Tufte 11ty theme Feb 1, 2026

Copilot AI requested a review from benkutil February 1, 2026 13:30

Copilot finished work on behalf of benkutil February 1, 2026 13:30

benkutil requested changes Feb 1, 2026

View reviewed changes

Copilot started work on behalf of benkutil February 1, 2026 13:37 View session

Fix Cloudflare build by specifying Node 18 in .nvmrc

b244e30

Co-authored-by: benkutil <228373+benkutil@users.noreply.github.com>

Copilot AI requested a review from benkutil February 1, 2026 13:40

Copilot finished work on behalf of benkutil February 1, 2026 13:40

Copilot started work on behalf of benkutil February 1, 2026 13:44 View session

Update Node version to 20 to fix undici dependency issue

58ea12f

Co-authored-by: benkutil <228373+benkutil@users.noreply.github.com>

Copilot finished work on behalf of benkutil February 1, 2026 13:47

benkutil requested changes Feb 1, 2026

View reviewed changes

Copilot started work on behalf of benkutil February 1, 2026 13:52 View session

Copilot AI requested a review from benkutil February 1, 2026 13:53

Copilot finished work on behalf of benkutil February 1, 2026 13:53

benkutil marked this pull request as ready for review February 1, 2026 13:57

benkutil approved these changes Feb 1, 2026

View reviewed changes

benkutil enabled auto-merge (squash) February 1, 2026 13:58

benkutil merged commit 1e2acf3 into main Feb 1, 2026
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Integrate Tufte 11ty theme#94

Integrate Tufte 11ty theme#94
benkutil merged 5 commits into
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copilot/add-11ty-theme-tufte

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Integration Plan for Tufte 11ty Theme

Summary

Cloudflare Build Fix

Screenshots

Homepage with Tufte Theme

Blog Post with Tufte Theme

Security Summary

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Deploying benkutil-github-io with Cloudflare Pages

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Copilot AI commented Feb 1, 2026 •

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