feat(rsc): expose framework utility helpers

packages/plugin-rsc/package.json

@@ -25,6 +25,7 @@
     "./package.json": "./package.json",
     "./types": "./types/index.d.ts",
     ".": "./dist/index.js",
+    "./utils": "./dist/utils.js",
     "./transforms": "./dist/transforms/index.js",
     "./*": "./dist/*.js"
   },

packages/plugin-rsc/src/utils.test.ts

@@ -0,0 +1,61 @@
+import type { DevEnvironment } from 'vite'
+import { describe, expect, it } from 'vitest'
+import { hashString, normalizeViteImportAnalysisUrl } from './utils'
+
+function createEnvironment(options?: {
+  consumer?: 'client' | 'server'
+  timestamp?: number
+}) {
+  return {
+    config: {
+      root: '/root',
+      consumer: options?.consumer ?? 'server',
+    },
+    moduleGraph: {
+      getModuleById: () =>
+        options?.timestamp
+          ? { lastHMRTimestamp: options.timestamp }
+          : undefined,
+    },
+  } as unknown as DevEnvironment
+}
+
+describe(hashString, () => {
+  it('returns a stable short sha256 hash', () => {
+    expect(hashString('test')).toBe('9f86d081884c')
+    expect(hashString('test')).toBe(hashString('test'))
+    expect(hashString('other')).not.toBe(hashString('test'))
+  })
+})
+
+describe(normalizeViteImportAnalysisUrl, () => {
+  it('normalizes root files and virtual ids', () => {
+    const environment = createEnvironment()
+    expect(
+      normalizeViteImportAnalysisUrl(environment, '/root/src/action.ts'),
+    ).toBe('/src/action.ts')
+    expect(normalizeViteImportAnalysisUrl(environment, 'virtual:action')).toBe(
+      '/@id/virtual:action',
+    )
+  })
+
+  it('injects HMR timestamps for client consumers or when requested', () => {
+    const id = '/root/src/action.ts'
+    expect(
+      normalizeViteImportAnalysisUrl(
+        createEnvironment({ consumer: 'client', timestamp: 123 }),
+        id,
+      ),
+    ).toBe('/src/action.ts?t=123')
+    expect(
+      normalizeViteImportAnalysisUrl(
+        createEnvironment({ timestamp: 456 }),
+        id,
+        { injectHMRTimestamp: true },
+      ),
+    ).toBe('/src/action.ts?t=456')
+    expect(
+      normalizeViteImportAnalysisUrl(createEnvironment({ timestamp: 789 }), id),
+    ).toBe('/src/action.ts')
+  })
+})

packages/plugin-rsc/src/utils.ts

@@ -0,0 +1,2 @@
+export { hashString } from './plugins/utils'
+export { normalizeViteImportAnalysisUrl } from './plugins/vite-utils'

packages/plugin-rsc/tsdown.config.ts

@@ -15,6 +15,7 @@ export default defineConfig({
     'src/react/browser.ts',
     'src/react/ssr.ts',
     'src/react/rsc.ts',
+    'src/utils.ts',
     'src/transforms/index.ts',
     'src/plugins/cjs.ts',
     'src/utils/rpc.ts',