feat: support JSON partiality (#114)

sxzz · SunsetTechuila · web-flow · commit a514b4acdadc · 2025-09-30T13:54:23.000+08:00
Co-authored-by: Grigory &lt;techuila.sunset@gmail.com&gt;
diff --git a/src/filename.ts b/src/filename.ts
@@ -7,6 +7,7 @@ export const RE_DTS_MAP: RegExp = /\.d\.([cm]?)ts\.map$/
 export const RE_NODE_MODULES: RegExp = /[\\/]node_modules[\\/]/
 export const RE_CSS: RegExp = /\.css$/
 export const RE_VUE: RegExp = /\.vue$/
+export const RE_JSON: RegExp = /\.json$/
 
 export function filename_js_to_dts(id: string): string {
   return id.replace(RE_JS, '.d.$1ts')
@@ -16,6 +17,7 @@ export function filename_to_dts(id: string): string {
     .replace(RE_VUE, '.vue.ts')
     .replace(RE_TS, '.d.$1ts')
     .replace(RE_JS, '.d.$1ts')
+    .replace(RE_JSON, '.d.ts')
 }
 export function filename_dts_to(id: string, ext: 'js' | 'ts'): string {
   return id.replace(RE_DTS, `.$1${ext}`)
diff --git a/src/generate.ts b/src/generate.ts
@@ -10,6 +10,7 @@ import {
   RE_DTS,
   RE_DTS_MAP,
   RE_JS,
+  RE_JSON,
   RE_NODE_MODULES,
   RE_TS,
   RE_VUE,
@@ -181,7 +182,7 @@ export function createGeneratePlugin({
       order: 'pre',
       filter: {
         id: {
-          include: [RE_JS, RE_TS, RE_VUE],
+          include: [RE_JS, RE_TS, RE_VUE, RE_JSON],
           exclude: [RE_DTS, RE_NODE_MODULES],
         },
       },
@@ -206,6 +207,7 @@ export function createGeneratePlugin({
         }
 
         if (emitDtsOnly) {
+          if (RE_JSON.test(id)) return '{}'
           return 'export { }'
         }
       },
diff --git a/src/index.ts b/src/index.ts
@@ -12,6 +12,7 @@ export {
   RE_DTS,
   RE_DTS_MAP,
   RE_JS,
+  RE_JSON,
   RE_NODE_MODULES,
   RE_TS,
   RE_VUE,
diff --git a/src/resolver.ts b/src/resolver.ts
@@ -5,6 +5,7 @@ import {
   filename_to_dts,
   RE_CSS,
   RE_DTS,
+  RE_JSON,
   RE_NODE_MODULES,
   RE_TS,
   RE_VUE,
@@ -13,7 +14,7 @@ import type { OptionsResolved } from './options.ts'
 import type { Plugin, ResolvedId } from 'rolldown'
 
 function isSourceFile(id: string) {
-  return RE_TS.test(id) || RE_VUE.test(id)
+  return RE_TS.test(id) || RE_VUE.test(id) || RE_JSON.test(id)
 }
 
 export function createDtsResolvePlugin({
diff --git a/tests/__snapshots__/tsc.test.ts.snap b/tests/__snapshots__/tsc.test.ts.snap
@@ -102,6 +102,21 @@ const input2 = "input2";
 export { input2 };"
 `;
 
+exports[`tsc > import JSON 1`] = `
+"// index.d.ts
+declare namespace foo_d_exports {
+  export { age, name };
+}
+declare let name: string;
+declare let age: number;
+declare namespace bar_d_exports {
+  export { _exports as default };
+}
+declare const _exports: string[];
+//#endregion
+export { age, _exports as bar, bar_d_exports as barNs, foo_d_exports as fooNs, name };"
+`;
+
 exports[`tsc > jsdoc 1`] = `
 "// jsdoc.d.ts
 import { Plugin } from "rolldown";
diff --git a/tests/fixtures/import-json/bar.json b/tests/fixtures/import-json/bar.json
@@ -0,0 +1 @@
+["bar"]
diff --git a/tests/fixtures/import-json/foo.json b/tests/fixtures/import-json/foo.json
@@ -1,4 +1,4 @@
 {
   "name": "foo",
   "age": 42
-}
+}
diff --git a/tests/fixtures/import-json/index.ts b/tests/fixtures/import-json/index.ts
@@ -0,0 +1,8 @@
+// import foo from './foo.json' // TODO not supported yet
+import * as fooNs from './foo.json'
+
+import bar from './bar.json'
+import * as barNs from './bar.json'
+
+export { name, age } from './foo.json'
+export { bar, fooNs, barNs }
diff --git a/tests/rollup-plugin-dts/import-json/bar.json b/tests/rollup-plugin-dts/import-json/bar.json
diff --git a/tests/rollup-plugin-dts/import-json/diff.patch b/tests/rollup-plugin-dts/import-json/diff.patch
diff --git a/tests/rollup-plugin-dts/import-json/index.ts b/tests/rollup-plugin-dts/import-json/index.ts
diff --git a/tests/rollup-plugin-dts/import-json/tsconfig.json b/tests/rollup-plugin-dts/import-json/tsconfig.json
diff --git a/tests/tsc.test.ts b/tests/tsc.test.ts
@@ -283,4 +283,19 @@ describe('tsc', () => {
     )
     expect(snapshot).toMatchSnapshot()
   })
+
+  test('import JSON', async () => {
+    const { snapshot } = await rolldownBuild(
+      path.resolve(dirname, 'fixtures/import-json/index.ts'),
+      [
+        dts({
+          compilerOptions: {
+            isolatedDeclarations: false,
+          },
+          emitDtsOnly: true,
+        }),
+      ],
+    )
+    expect(snapshot).toMatchSnapshot()
+  })
 })

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`	`1`	`{`
`2`	`2`	`"name": "foo",`
`3`	`3`	`"age": 42`
`4`		`-}`
	`4`	`+}`