# multi-swe-bench / sveltejs__svelte12509 - taskset: [multi-swe-bench](https://harnessreport.com/tasks/multi-swe-bench.md) - difficulty: hard - category: software-development - language: - runnable from the site: no - agent timeout: 14400s ## Results by harness _none yet_ ## Instruction ``` <uploaded_files> /workspace/svelte </uploaded_files> I've uploaded a Javascript code repository in the directory /workspace/svelte. Consider the following issue description: <issue_description> # feat: allow `:global` in more places Today, a selector like `div { :global { &.x { .. } } }` is valid, but the equivalent selector `div:global.x { ... }` throws a compiler error. Apart from being inconsistent, this poses a real problem because some CSS preprocessors _will_ apply (rightfully) CSS de-nesting, which means `div { :global { &.x { .. } } }` is turned into `div:global.x { ... }`. With this PR, the placement of `:global` (but not `:global(...)`) is relaxed and it can now appear _anywhere_ inside a selector, just like regular pseudo classes can. Fixing this also fixes #10513 because Tailwind users are now unblocked when using `@apply` with variants, like `dark:`. They can now write this ```diff - main { + main:global { @apply bg-blue-100 dark:bg-red-100 } ``` ...which tailwind's preprocessor will turn into something like this ```css main { background: blue; } main:global:is(dark-mode *) { background: red; } ``` (note how `:global` is between `main` and `:is`, which is valid CSS but wasn't valid Svelte up until now) (doing `main :global { .. }` wouldn't work because it would be turned into `main :global:is(...) { .. }` which wouldn't match any elements) ...which Svelte can then turn into this: ```css main.svelte-hash123 { background: blue; } main.svelte-hash123:is(dark-mode *) { background: red; } ``` ... which satisfies all constraints and works correctly/as expected. ### Before submitting the PR, please make sure you do the following - [x] It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs - [x] Prefix your PR title with `feat:`, `fix:`, `chore:`, or `docs:`. - [x] This message body should clearly illustrate what problems it solves. - [x] Ideally, include a test that fails without this PR but passes with it. ### Tests and linting - [x] Run the tests with `pnpm test` and lint the project with `pnpm lint` ## Repository Information - **Repository**: sveltejs/svelte - **Pull Request**: #12509 - **Base Commit**: `30b143cef0d5ea17a6edec33496681882eadce34` ## Related Issues - https://github.com/sveltejs/svelte/issues/10513 </issue_description> Can you help me implement the necessary changes to the repository so that the requirements specified in the <issue_description> are met? I've already taken care of all changes to any of the test files described in the <issue_description>. This means you DON'T have to modify the testing logic or any of the tests in any way! Also the development Javascript environment is already set up for you (i.e., all dependencies already installed), so you don't need to install other packages. Your task is to make the minimal changes to non-test files in the /workspace/svelte directory to ensure the <issue_description> is satisfied. Follow these phases to resolve the issue: Phase 1. READING: read the problem and reword it in clearer terms 1.1 If there are code or config snippets. Express in words any best practices or conventions in them. 1.2 Highlight message errors, method names, variables, file names, stack traces, and technical details. 1.3 Explain the problem in clear terms. 1.4 Enumerate the steps to reproduce the problem. 1.5 Highlight any best practices to take into account when testing and fixing the issue. Phase 2. RUNNING: install and run the tests on the repository 2.1 Follow the readme. 2.2 Install the environment and anything needed. 2.3 Iterate and figure out how to run the tests. Phase 3. EXPLORATION: find the files that are related to the problem and possible solutions 3.1 Use `grep` to search for relevant methods, classes, keywords and error messages. 3.2 Identify all files related to the problem statement. 3.3 Propose the methods and files to fix the issue and explain why. 3.4 From the possible file locations, select the most likely location to fix the issue. Phase 4. TEST CREATION: before implementing any fix, create a script to reproduce and verify the issue 4.1 Look at existing test files in the repository to understand the test format/structure. 4.2 Create a minimal reproduction script that reproduces the located issue. 4.3 Run the reproduction script with `node <filename.js>` to confirm you are reproducing the issue. 4.4 Adjust the reproduction script as necessary. Phase 5. FIX ANALYSIS: state clearly the problem and how to fix it 5.1 State clearly what the problem is. 5.2 State clearly where the problem is located. 5.3 State clearly how the test reproduces the issue. 5.4 State clearly the best practices to take into account in the fix. 5.5 State clearly how to fix the problem. Phase 6. FIX IMPLEMENTATION: Edit the source code to implement your chosen solution. 6.1 Make minimal, focused changes to fix the issue. Phase 7. VERIFICATION: Test your implementation thoroughly. 7.1 Run your reproduction script to verify the fix works. 7.2 Add edge cases to your test script to ensure comprehensive coverage. 7.3 Run existing tests related to the modified code with `npm test` to ensure you haven't broken anything. Phase 8. FINAL REVIEW: Carefully re-read the problem description and compare your changes with the base commit 30b143cef0d5ea17a6edec33496681882eadce34. 8.1 Ensure you've fully addressed all requirements. 8.2 Run any tests in the repository related to: 8.2.1 The issue you are fixing 8.2.2 The files you modified 8.2.3 The functions you changed 8.3 If any tests fail, revise your implementation until all tests pass. Be thorough in your exploration, testing, and reasoning. It's fine if your thinking process is lengthy - quality and completeness are more important than brevity. IMPORTANT CONSTRAINTS: - ONLY modify files within the /workspace/svelte directory - DO NOT navigate outside this directory (no `cd ..` or absolute paths to other locations) - DO NOT create, modify, or delete any files outside the repository - All your changes must be trackable by `git diff` within the repository - If you need to create test files, create them inside the repository directory ``` --- Harness Report runs agent harnesses from their GitHub repos on Harbor tasks and records every model call. Every page is also `.md` and `.json`; index: https://harnessreport.com/llms.txt · MCP: https://harnessreport.com/mcp