Add disclosure reporter

packages/docs/src/content/docs/features/reporters.md

@@ -8,8 +8,9 @@ Knip provides the following built-in reporters:
 
 - `codeowners`
 - `compact`
-- `json`
-- `markdown`
+- [`disclosure`](#disclosure)
+- [`json`](#json)
+- [`markdown`](#markdown)
 - `symbol` (default)
 
 Example usage:
@@ -103,6 +104,54 @@ Markdown tables separated by issue types as headings, for example:
 | ./unresolved | src/index.ts:10:12 | error    |
 ```
 
+### Disclosure
+
+This reporter is useful for sharing large reports. Groups of issues are rendered
+in a closed state initially. The reporter renders this:
+
+````text
+$ knip --reporter disclosure
+
+<details><summary>Unused files (2)</summary>
+
+```
+unused.ts
+dangling.js
+```
+
+</details>
+
+<details><summary>Unused dependencies (2)</summary>
+
+```
+unused-dep     package.json
+my-package     package.json
+```
+
+</details>
+````
+
+The above can be copy-pasted where HTML and Markdown is supported, such as a
+GitHub issue or pull request, and renders like so:
+
+<details><summary>Unused files (2)</summary>
+
+```
+unused.ts
+dangling.js
+```
+
+</details>
+
+<details><summary>Unused dependencies (2)</summary>
+
+```
+unused-dep     package.json
+my-package     package.json
+```
+
+</details>
+
 ## Custom Reporters
 
 When the provided built-in reporters are not sufficient, a custom local reporter

packages/knip/src/reporters/disclosure.ts

@@ -0,0 +1,56 @@
+import EasyTable from 'easy-table';
+import type { Entries } from 'type-fest';
+import type { Issue, ReporterOptions } from '../types/issues.js';
+import { relative, toRelative } from '../util/path.js';
+import { getTitle } from './util.js';
+
+const printHeader = (size: number, title?: string) =>
+  console.log(`<details>${title ? `<summary>${title} (${size})</summary>` : ''}\n\n\`\`\``);
+
+const printFooter = () => console.log('```\n\n</details>\n');
+
+const logIssueRecord = (issues: Issue[]) => {
+  const table = new EasyTable();
+  for (const issue of issues) {
+    table.cell('symbol', issue.symbols ? issue.symbols.map(s => s.symbol).join(', ') : issue.symbol);
+    issue.parentSymbol && table.cell('parentSymbol', issue.parentSymbol);
+    issue.symbolType && table.cell('symbolType', issue.symbolType);
+    const pos = issue.line === undefined ? '' : `:${issue.line}${issue.col === undefined ? '' : `:${issue.col}`}`;
+    const cell = `${relative(issue.filePath)}${pos}`;
+    table.cell('filePath', cell);
+    table.newRow();
+  }
+  console.log(table.sort(['filePath', 'parentSymbol', 'symbol']).print().trim());
+};
+
+export default ({ report, issues }: ReporterOptions) => {
+  const reportMultipleGroups = Object.values(report).filter(Boolean).length > 1;
+  let totalIssues = 0;
+
+  for (const [reportType, isReportType] of Object.entries(report) as Entries<typeof report>) {
+    if (reportType === '_files') continue;
+
+    if (isReportType) {
+      const title = reportMultipleGroups ? getTitle(reportType) : undefined;
+
+      if (reportType === 'files') {
+        const issuesForType = Array.from(issues._files);
+        if (issuesForType.length > 0) {
+          printHeader(issuesForType.length, title);
+          const sortedIssues = issuesForType.sort((a, b) => a.filePath.localeCompare(b.filePath));
+          for (const issue of sortedIssues) console.log(toRelative(issue.filePath));
+          totalIssues = totalIssues + issuesForType.length;
+          printFooter();
+        }
+      } else {
+        const issuesForType = Object.values(issues[reportType]).flatMap(Object.values);
+        if (issuesForType.length > 0) {
+          printHeader(issuesForType.length, title);
+          logIssueRecord(issuesForType);
+          totalIssues = totalIssues + issuesForType.length;
+          printFooter();
+        }
+      }
+    }
+  }
+};

packages/knip/src/reporters/index.ts

@@ -1,5 +1,6 @@
 import codeowners from './codeowners.js';
 import compact from './compact.js';
+import disclosure from './disclosure.js';
 import json from './json.js';
 import markdown from './markdown.js';
 import symbols from './symbols.js';
@@ -8,6 +9,7 @@ export default {
   symbols,
   compact,
   codeowners,
+  disclosure,
   json,
   markdown,
 };