All code snippets, hints, seed code, and automated checks must follow a single, consistent formatting and style contract—especially around quote usage and basic JS/TS syntax. Apply these rules: - **Formatting:** use the team’s standard indentation (e.g., 2 spaces) and include semicolons consistently. - **No broken snippets:** seed code examples must compile/parse; avoid syntax errors and duplicate declarations. - **Quote-robust tests/hints:** when matching user code, support **both** single and double quotes and (when relevant) ensure the same quote type is used via backreferences. - **Pattern consistency:** hints should prefer the same DOM/API patterns the seed uses (to avoid ambiguity), unless there’s an explicit reason to allow alternatives. Example (quote-robust hint regex): ```js // Matches: document.getElementById('income') or document.getElementById("income") assert.match(code, /document\.getElementById\(\s*(['"])income\1\s*\)/); ``` Example (style-correct TS): ```ts function f(): void { const x = 1; console.log(x); } ``` Example (avoid duplicate seed declarations): ```ts const cardDisplay = document.querySelector("#current-card")!; // (don’t redeclare cardDisplay again) ```