feat: tsdown plugin (#1109)

Author: TheAlexLichter

packages/knip/fixtures/plugins/tsdown/entry-1.ts

@@ -0,0 +1,14 @@
+{
+  "name": "@plugins/tsdown",
+  "devDependencies": {
+    "tsdown": "*"
+  },
+  "scripts": {
+    "build": "tsdown",
+    "build-3": "tsdown --config tsdown.config-3.ts",
+    "build-4": "tsdown -c tsdown.config-4.ts"
+  },
+  "tsdown": {
+    "entry": ["entry-5.ts"]
+  }
+}

packages/knip/fixtures/plugins/tsdown/entry-2.ts

@@ -0,0 +1,5 @@
+import { defineConfig } from 'tsdown';
+
+export default defineConfig({
+  entry: ['entry-3.ts'],
+});

packages/knip/fixtures/plugins/tsdown/entry-3.ts

@@ -0,0 +1,5 @@
+import { defineConfig } from 'tsdown';
+
+export default defineConfig({
+  entry: ['entry-4.ts'],
+});

packages/knip/fixtures/plugins/tsdown/entry-4.ts

@@ -0,0 +1,3 @@
+{
+  "entry": ["entry-1.ts"]
+}

packages/knip/fixtures/plugins/tsdown/entry-5.ts

@@ -0,0 +1,5 @@
+import { defineConfig } from 'tsdown';
+
+export default defineConfig({
+  entry: ['entry-2.ts'],
+});

packages/knip/fixtures/plugins/tsdown/node_modules/tsdown/index.js

@@ -651,6 +651,10 @@
           "title": "ts-node plugin configuration (https://knip.dev/reference/plugins/ts-node)",
           "$ref": "#/definitions/plugin"
         },
+        "tsdown": {
+          "title": "tsdown plugin configuration (https://knip.dev/reference/plugins/tsdown)",
+          "$ref": "#/definitions/plugin"
+        },
         "tsup": {
           "title": "tsup plugin configuration (https://knip.dev/reference/plugins/tsup)",
           "$ref": "#/definitions/plugin"

packages/knip/fixtures/plugins/tsdown/node_modules/tsdown/package.json

@@ -88,6 +88,7 @@ import { default as syncpack } from './syncpack/index.js';
 import { default as tailwind } from './tailwind/index.js';
 import { default as travis } from './travis/index.js';
 import { default as tsNode } from './ts-node/index.js';
+import { default as tsdown } from './tsdown/index.js';
 import { default as tsup } from './tsup/index.js';
 import { default as tsx } from './tsx/index.js';
 import { default as typedoc } from './typedoc/index.js';
@@ -197,6 +198,7 @@ export const Plugins = {
   tailwind,
   travis,
   'ts-node': tsNode,
+  tsdown,
   tsup,
   tsx,
   typedoc,

packages/knip/fixtures/plugins/tsdown/package.json

@@ -0,0 +1,42 @@
+import type { IsPluginEnabled, Plugin, ResolveConfig } from '../../types/config.js';
+import { toProductionEntry } from '../../util/input.js';
+import { hasDependency } from '../../util/plugin.js';
+import type { TsdownConfig } from './types.js';
+
+// https://github.com/rolldown/tsdown/blob/main/src/options/index.ts
+
+const title = 'tsdown';
+
+const enablers = ['tsdown'];
+
+const isEnabled: IsPluginEnabled = ({ dependencies }) => hasDependency(dependencies, enablers);
+
+const config = ['tsdown.config.{ts,mts,cts,js,mjs,cjs,json}', 'package.json'];
+
+const resolveConfig: ResolveConfig<TsdownConfig> = async config => {
+  if (typeof config === 'function') config = await config({});
+
+  const entryPatterns = [config]
+    .flat()
+    .flatMap(config => {
+      if (!config.entry) return [];
+      if (Array.isArray(config.entry)) return config.entry;
+      return Object.values(config.entry);
+    })
+    .map(id => toProductionEntry(id, { allowIncludeExports: true }));
+
+  return entryPatterns;
+};
+
+const args = {
+  config: true,
+};
+
+export default {
+  title,
+  enablers,
+  isEnabled,
+  config,
+  resolveConfig,
+  args,
+} satisfies Plugin;

packages/knip/fixtures/plugins/tsdown/tsdown.config-3.ts

@@ -0,0 +1,9 @@
+type Entry = string[] | Record<string, string>;
+
+type Options = {
+  entry?: Entry;
+};
+
+type MaybePromise<T> = T | Promise<T>;
+
+export type TsdownConfig = Options | Options[] | ((overrideOptions: Options) => MaybePromise<Options | Options[]>);

packages/knip/fixtures/plugins/tsdown/tsdown.config-4.ts

@@ -102,6 +102,7 @@ export const pluginsSchema = z.object({
   tailwind: pluginSchema,
   travis: pluginSchema,
   'ts-node': pluginSchema,
+  tsdown: pluginSchema,
   tsup: pluginSchema,
   tsx: pluginSchema,
   typedoc: pluginSchema,

packages/knip/fixtures/plugins/tsdown/tsdown.config.json

@@ -89,6 +89,7 @@ export type PluginName =
   | 'tailwind'
   | 'travis'
   | 'ts-node'
+  | 'tsdown'
   | 'tsup'
   | 'tsx'
   | 'typedoc'
@@ -198,6 +199,7 @@ export const pluginNames = [
   'tailwind',
   'travis',
   'ts-node',
+  'tsdown',
   'tsup',
   'tsx',
   'typedoc',

packages/knip/fixtures/plugins/tsdown/tsdown.config.ts

@@ -0,0 +1,21 @@
+import { test } from 'bun:test';
+import assert from 'node:assert/strict';
+import { main } from '../../src/index.js';
+import { resolve } from '../../src/util/path.js';
+import baseArguments from '../helpers/baseArguments.js';
+import baseCounters from '../helpers/baseCounters.js';
+
+const cwd = resolve('fixtures/plugins/tsdown');
+
+test('Find dependencies with the tsdown plugin', async () => {
+  const { counters } = await main({
+    ...baseArguments,
+    cwd,
+  });
+
+  assert.deepEqual(counters, {
+    ...baseCounters,
+    processed: 8,
+    total: 8,
+  });
+});