feat: allow to exclude dependencies from specific package.json (#717)

docs/README.md

@@ -52,7 +52,7 @@ This will output `dist/index.js` and `dist/cli.js`.
 
 ### Excluding packages
 
-By default tsup bundles all `import`-ed modules but `dependencies` and `peerDependencies` in your `packages.json` are always excluded, you can also use `--external <module>` flag to mark other packages as external.
+By default tsup bundles all `import`-ed modules but `dependencies` and `peerDependencies` in your `packages.json` are always excluded, you can also use `--external <module|pkgJson>` flag to mark other packages or other special `package.json`'s `dependencies` and `peerDependencies` as external.
 
 ### Excluding all packages
 

src/cli-main.ts

@@ -58,7 +58,7 @@ export async function main(options: Options = {}) {
       'Replace a global variable with an import from another file'
     )
     .option('--define.* <value>', 'Define compile-time constants')
-    .option('--external <name>', 'Mark specific packages as external')
+    .option('--external <name>', 'Mark specific packages / package.json (dependencies and peerDependencies) as external')
     .option('--global-name <name>', 'Global variable name for iife format')
     .option('--jsxFactory <jsxFactory>', 'Name of JSX factory function', {
       default: 'React.createElement',

src/esbuild/index.ts

@@ -58,6 +58,27 @@ const getOutputExtensionMap = (
   }
 }
 
+/**
+ * Support to exclude special package.json
+ */
+const generateExternal = async (external: (string | RegExp)[]) => {
+  const result: (string | RegExp)[] = []
+
+  for (const item of external) {
+    if (typeof item !== 'string' || !item.endsWith('package.json')) {
+      result.push(item)
+      continue
+    }
+
+    let pkgPath: string = path.isAbsolute(item) ? path.dirname(item) : path.dirname(path.resolve(process.cwd(), item))
+
+    const deps = await getDeps(pkgPath)
+    result.push(...deps)
+  }
+
+  return result
+}
+
 export async function runEsbuild(
   options: NormalizedOptions,
   {
@@ -79,7 +100,7 @@ export async function runEsbuild(
   const external = [
     // Exclude dependencies, e.g. `lodash`, `lodash/get`
     ...deps.map((dep) => new RegExp(`^${dep}($|\\/|\\\\)`)),
-    ...(options.external || []),
+    ...(await generateExternal(options.external || [])),
   ]
   const outDir = options.outDir
 
@@ -103,8 +124,8 @@ export async function runEsbuild(
     format === 'iife'
       ? false
       : typeof options.splitting === 'boolean'
-      ? options.splitting
-      : format === 'esm'
+        ? options.splitting
+        : format === 'esm'
 
   const platform = options.platform || 'node'
   const loader = options.loader || {}
@@ -131,12 +152,12 @@ export async function runEsbuild(
     // esbuild's `external` option doesn't support RegExp
     // So here we use a custom plugin to implement it
     format !== 'iife' &&
-      externalPlugin({
-        external,
-        noExternal: options.noExternal,
-        skipNodeModulesBundle: options.skipNodeModulesBundle,
-        tsconfigResolvePaths: options.tsconfigResolvePaths,
-      }),
+    externalPlugin({
+      external,
+      noExternal: options.noExternal,
+      skipNodeModulesBundle: options.skipNodeModulesBundle,
+      tsconfigResolvePaths: options.tsconfigResolvePaths,
+    }),
     options.tsconfigDecoratorMetadata && swcPlugin({ logger }),
     nativeNodeModulesPlugin(),
     postcssPlugin({ css, inject: options.injectStyle }),
@@ -199,8 +220,8 @@ export async function runEsbuild(
         TSUP_FORMAT: JSON.stringify(format),
         ...(format === 'cjs' && injectShims
           ? {
-              'import.meta.url': 'importMetaUrl',
-            }
+            'import.meta.url': 'importMetaUrl',
+          }
           : {}),
         ...options.define,
         ...Object.keys(env).reduce((res, key) => {

test/__snapshots__/index.test.ts.snap

@@ -74,19 +74,24 @@ var input_exports = {};
 __export(input_exports, {
   bar: () => import_bar.bar,
   baz: () => baz,
-  foo: () => import_foo.foo
+  foo: () => import_foo.foo,
+  qux: () => import_qux.qux
 });
 module.exports = __toCommonJS(input_exports);
 var import_foo = require(\\"foo\\");
 var import_bar = require(\\"bar\\");
 
 // node_modules/baz/index.ts
 var baz = \\"baz\\";
+
+// input.ts
+var import_qux = require(\\"qux\\");
 // Annotate the CommonJS export names for ESM import in node:
 0 && (module.exports = {
   bar,
   baz,
-  foo
+  foo,
+  qux
 });
 "
 `;

test/index.test.ts

@@ -344,16 +344,20 @@ test('external', async () => {
     'input.ts': `export {foo} from 'foo'
     export {bar} from 'bar'
     export {baz} from 'baz'
+    export {qux} from 'qux'
     `,
     'node_modules/foo/index.ts': `export const foo = 'foo'`,
     'node_modules/foo/package.json': `{"name":"foo","version":"0.0.0"}`,
     'node_modules/bar/index.ts': `export const bar = 'bar'`,
     'node_modules/bar/package.json': `{"name":"bar","version":"0.0.0"}`,
     'node_modules/baz/index.ts': `export const baz = 'baz'`,
     'node_modules/baz/package.json': `{"name":"baz","version":"0.0.0"}`,
+    'node_modules/qux/index.ts': `export const qux = 'qux'`,
+    'node_modules/qux/package.json': `{"name":"qux","version":"0.0.0"}`,
+    'another/package.json': `{"name":"another-pkg","dependencies":{"qux":"0.0.0"}}`,
     'tsup.config.ts': `
     export default {
-      external: [/f/, 'bar']
+      external: [/f/, 'bar', 'another/package.json']
     }
     `,
   })