Nuxt/packages/nuxt/test/treeshake-client.test.ts

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import { readFileSync } from 'node:fs'
import path from 'node:path'
import { describe, expect, it, vi } from 'vitest'
import * as VueCompilerSFC from 'vue/compiler-sfc'
import type { Plugin } from 'vite'
import { Parser } from 'acorn'
import type { Options } from '@vitejs/plugin-vue'
import _vuePlugin from '@vitejs/plugin-vue'
import { TreeShakeTemplatePlugin } from '../src/components/tree-shake'
import { fixtureDir, normalizeLineEndings } from './utils'
// mock due to differences of results between windows and linux
vi.spyOn(path, 'relative').mockImplementation((from: string, to: string) => {
if (to.includes('SomeComponent')) {
return to
}
return path.resolve(from, to)
})
function vuePlugin (options: Options) {
return {
..._vuePlugin(options),
handleHotUpdate () {},
configureDevServer () {},
}
}
const WithClientOnly = normalizeLineEndings(readFileSync(path.resolve(fixtureDir, './components/client/WithClientOnlySetup.vue')).toString())
const treeshakeTemplatePlugin = TreeShakeTemplatePlugin.raw({
sourcemap: false,
getComponents () {
return [{
pascalName: 'NotDotClientComponent',
kebabName: 'not-dot-client-component',
export: 'default',
filePath: 'dummypath',
shortPath: 'dummypath',
chunkName: '123',
prefetch: false,
preload: false,
mode: 'client',
}, {
pascalName: 'DotClientComponent',
kebabName: 'dot-client-component',
export: 'default',
filePath: 'dummypath',
shortPath: 'dummypath',
chunkName: '123',
prefetch: false,
preload: false,
mode: 'client',
}]
},
}, { framework: 'rollup' }) as Plugin
const treeshake = async (source: string): Promise<string> => {
// eslint-disable-next-line @typescript-eslint/no-unsafe-function-type
const result = await (treeshakeTemplatePlugin.transform! as Function).call({
parse: (code: string, opts: any = {}) => Parser.parse(code, {
sourceType: 'module',
ecmaVersion: 'latest',
locations: true,
...opts,
}),
}, source)
return typeof result === 'string' ? result : result?.code
}
async function SFCCompile (name: string, source: string, options: Options, ssr = false): Promise<string> {
const plugin = vuePlugin({
compiler: VueCompilerSFC,
...options,
})
// @ts-expect-error Types are not correct as they are too generic
plugin.configResolved!({
isProduction: options.isProduction,
command: 'build',
root: process.cwd(),
build: { sourcemap: false },
define: {},
})
// eslint-disable-next-line @typescript-eslint/no-unsafe-function-type
const result = await (plugin.transform! as Function).call({
parse: (code: string, opts: any = {}) => Parser.parse(code, {
sourceType: 'module',
ecmaVersion: 'latest',
locations: true,
...opts,
}),
}, source, name, {
ssr,
})
return typeof result === 'string' ? result : result?.code
}
const stateToTest: { index: number, name: string, options: Partial<Options & { devServer: { config: { server: any } } }> }[] = [
{
index: 0,
name: 'prod',
options: {
isProduction: true,
},
},
{
index: 1,
name: 'dev',
options: {
isProduction: false,
devServer: {
config: {
// trigger dev behavior
server: false,
},
},
},
},
]
describe('treeshake client only in ssr', () => {
vi.spyOn(process, 'cwd').mockImplementation(() => '')
it.each(stateToTest)(`should treeshake ClientOnly correctly in $name`, async (state) => {
// add index to avoid using vite vue plugin cache
const clientResult = await SFCCompile(`SomeComponent${state.index}.vue`, WithClientOnly, state.options)
const ssrResult = await SFCCompile(`SomeComponent${state.index}.vue`, WithClientOnly, state.options, true)
const treeshaken = await treeshake(ssrResult)
const [_, scopeId] = clientResult.match(/['"]__scopeId['"],\s*['"](data-v-[^'"]+)['"]/)!
// ensure the id is correctly passed between server and client
expect(clientResult).toContain(`'__scopeId',"${scopeId}"`)
expect(treeshaken).toContain(`<div ${scopeId}>`)
expect(clientResult).toContain('should-be-treeshaken')
expect(treeshaken).not.toContain('should-be-treeshaken')
expect(treeshaken).not.toContain('import HelloWorld from \'../HelloWorld.vue\'')
expect(clientResult).toContain('import HelloWorld from \'../HelloWorld.vue\'')
expect(treeshaken).not.toContain('import { Treeshaken } from \'somepath\'')
expect(clientResult).toContain('import { Treeshaken } from \'somepath\'')
// remove resolved import
expect(treeshaken).not.toContain('const _component_ResolvedImport =')
expect(clientResult).toContain('const _component_ResolvedImport =')
// treeshake multi line variable declaration
expect(clientResult).toContain('const SomeIsland = defineAsyncComponent(async () => {')
expect(treeshaken).not.toContain('const SomeIsland = defineAsyncComponent(async () => {')
expect(treeshaken).not.toContain('return (await import(\'./../some.island.vue\'))')
expect(treeshaken).toContain('const NotToBeTreeShaken = defineAsyncComponent(async () => {')
// treeshake object and array declaration
expect(treeshaken).not.toContain('const { ObjectPattern } = await import(\'nuxt.com\')')
expect(treeshaken).not.toContain('const { ObjectPattern: ObjectPatternDeclaration } = await import(\'nuxt.com\')')
expect(treeshaken).toContain('const { ButShouldNotBeTreeShaken } = defineAsyncComponent(async () => {')
expect(treeshaken).toContain('const [ { Dont, }, That] = defineAsyncComponent(async () => {')
// treeshake object that has an assignment pattern
expect(treeshaken).toContain('const { woooooo, } = defineAsyncComponent(async () => {')
expect(treeshaken).not.toContain('const { Deep, assignment: { Pattern = ofComponent } } = defineAsyncComponent(async () => {')
// expect no empty ObjectPattern on treeshaking
expect(treeshaken).not.toContain('const { } = defineAsyncComponent')
expect(treeshaken).not.toContain('import { } from')
// expect components used in setup to not be removed
expect(treeshaken).toContain('import DontRemoveThisSinceItIsUsedInSetup from \'./ComponentWithProps.vue\'')
// expect import of ClientImport to be treeshaken but not Glob since it is also used outside <ClientOnly>
expect(treeshaken).not.toContain('ClientImport')
expect(treeshaken).toContain('import { Glob } from \'#components\'')
// treeshake .client slot
expect(treeshaken).not.toContain('ByeBye')
// don't treeshake variables that has the same name as .client components
expect(treeshaken).toContain('NotDotClientComponent')
expect(treeshaken).not.toContain('(DotClientComponent')
expect(treeshaken).not.toContain('AutoImportedComponent')
expect(treeshaken).toContain('AutoImportedNotTreeShakenComponent')
expect(treeshaken).not.toContain('Both')
expect(treeshaken).not.toContain('AreTreeshaken')
if (state.options.isProduction === false) {
// treeshake at inlined template
expect(treeshaken).not.toContain('ssrRenderComponent($setup["HelloWorld"]')
expect(treeshaken).toContain('ssrRenderComponent($setup["Glob"]')
} else {
// treeshake unref
expect(treeshaken).not.toContain('ssrRenderComponent(_unref(HelloWorld')
expect(treeshaken).toContain('ssrRenderComponent(_unref(Glob')
}
expect(treeshaken.replace(/data-v-\w{8}/g, 'data-v-one-hash').replace(/scoped=\w{8}/g, 'scoped=one-hash')).toMatchSnapshot()
})
it('should not treeshake reused component #26137', async () => {
const treeshaken = await treeshake(`import { resolveComponent as _resolveComponent, withCtx as _withCtx, createVNode as _createVNode } from "vue"
import { ssrRenderComponent as _ssrRenderComponent, ssrRenderAttrs as _ssrRenderAttrs } from "vue/server-renderer"
export function ssrRender(_ctx, _push, _parent, _attrs) {
const _component_AppIcon = _resolveComponent("AppIcon")
const _component_ClientOnly = _resolveComponent("ClientOnly")
_push(\`<div\${_ssrRenderAttrs(_attrs)}>\`)
_push(_ssrRenderComponent(_component_AppIcon, { name: "caret-left" }, null, _parent))
_push(_ssrRenderComponent(_component_ClientOnly, null, {
default: _withCtx((_, _push, _parent, _scopeId) => {
if (_push) {
_push(\`<span\${_scopeId}>TEST</span>\`)
_push(_ssrRenderComponent(_component_AppIcon, { name: "caret-up" }, null, _parent, _scopeId))
} else {
return [
_createVNode("span", null, "TEST"),
_createVNode(_component_AppIcon, { name: "caret-up" })
]
}
}),
_: 1 /* STABLE */
}, _parent))
_push(\`</div>\`)
}`)
expect(treeshaken).toContain('resolveComponent("AppIcon")')
expect(treeshaken).not.toContain('caret-up')
})
})