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refactor: Remove --preload flag (#1737)
* refactor: Removes `--preload` flag & functionality * docs: Adding changeset * docs: Updating readme for removal of preload
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‎.changeset/poor-sloths-mate.md‎

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@@ -0,0 +1,5 @@
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---
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'preact-cli': major
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---
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Removes `--preload` flag and functionality from build command.

‎README.md‎

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@@ -125,7 +125,6 @@ $ [npm run / yarn] preact build
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--babelConfig Path to custom Babel config (default .babelrc)
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--json Generate build stats for bundle analysis
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--template Path to custom HTML template (default 'src/template.html')
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--preload Adds preload tags to the document its assets (default false)
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--analyze Launch interactive Analyzer to inspect production bundle(s)
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--prerender Renders route(s) into generated static HTML (default true)
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--prerenderUrls Path to pre-rendered routes config (default prerender-urls.json)

‎packages/cli/src/lib/webpack/create-load-manifest.js‎

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‎packages/cli/src/lib/webpack/push-manifest.js‎

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‎packages/cli/src/lib/webpack/render-html-plugin.js‎

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@@ -7,7 +7,6 @@ const {
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} = require('html-webpack-skip-assets-plugin');
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const HtmlWebpackPlugin = require('html-webpack-plugin');
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const prerender = require('./prerender');
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const createLoadManifest = require('./create-load-manifest');
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const { esmImport, tryResolveConfig, warn } = require('../../util');
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const PREACT_FALLBACK_URL = '/200.html';
@@ -82,14 +81,6 @@ module.exports = async function renderHTMLPlugin(config) {
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entryFiles.find(file => /\.(m?js)(\?|$)/.test(file));
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});
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let loadManifest = compilation.assets['push-manifest.json']
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? JSON.parse(compilation.assets['push-manifest.json'].source())
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: createLoadManifest(
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compilation.assets,
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compilation.namedChunkGroups,
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config.isProd
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);
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return {
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cli: {
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title,
@@ -101,7 +92,6 @@ module.exports = async function renderHTMLPlugin(config) {
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preRenderData: values,
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CLI_DATA: { preRenderData: { url, ...routeData } },
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ssr: config.prerender ? prerender({ cwd, dest, src }, values) : '',
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loadManifest,
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entrypoints,
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},
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htmlWebpackPlugin: {

‎packages/cli/src/lib/webpack/webpack-client-config.js‎

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@@ -10,7 +10,6 @@ const CssMinimizerPlugin = require('css-minimizer-webpack-plugin');
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const { BundleAnalyzerPlugin } = require('webpack-bundle-analyzer');
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const CrittersPlugin = require('critters-webpack-plugin');
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const renderHTMLPlugin = require('./render-html-plugin');
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const PushManifestPlugin = require('./push-manifest');
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const baseConfig = require('./webpack-base-config');
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const { InjectManifest } = require('workbox-webpack-plugin');
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const CompressionPlugin = require('compression-webpack-plugin');
@@ -132,7 +131,6 @@ async function clientConfig(env) {
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'process.env.ADD_SW': env.sw,
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'process.env.PRERENDER': env.prerender,
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}),
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new PushManifestPlugin(env.isProd),
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...(await renderHTMLPlugin(env)),
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copyPatterns.length !== 0 &&
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new CopyWebpackPlugin({

‎packages/cli/src/resources/head-end.ejs‎

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@@ -2,10 +2,3 @@
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<% if (cli.manifest.theme_color) { %>
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<meta name="theme-color" content="<%= cli.manifest.theme_color %>">
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<% } %>
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<% const filesRegexp = cli.inlineCss ? /\.(chunk\.\w{5}\.css|js)$/ : /\.(css|js)$/;%>
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<% for (const file in cli.loadManifest[cli.url]) { %>
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<% if (cli.preload && file && file.match(filesRegexp)) { %>
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<% /* crossorigin for main bundle as that is loaded from `<script type=module` tag, other lazy loaded bundles are from webpack so its not needed */ %>
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<link rel="preload" href="<%= htmlWebpackPlugin.files.publicPath + file %>" as="<%= file.match(/\.css$/)?'style':'script' %>" <%= file.match(/bundle\.\w{5}\.(?<!legacy)\.js$/)?'crossorigin="anonymous"':'' %>>
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<% } %>
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<% } %>

‎packages/cli/tests/build.test.js‎

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@@ -90,58 +90,6 @@ describe('preact build', () => {
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expect(await access(file)).toBeUndefined();
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});
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describe('Push manifest plugin', () => {
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it('should produce correct default `push-manifest.json`', async () => {
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let dir = await create('default');
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await buildFast(dir);
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const manifest = await readFile(
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`${dir}/build/push-manifest.json`,
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'utf8'
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);
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expect(manifest).toEqual(
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expect.stringMatching(getRegExpFromMarkup(images.pushManifest))
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);
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});
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it('should produce correct `push-manifest.json` when expected values are missing', async () => {
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// In this subject, there is no source CSS which means no CSS asset is output.
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// In the past, this would result in `"undefined": { type: "style" ... }` being added to the manifest.
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let dir = await subject('custom-webpack');
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await buildFast(dir);
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const manifest = await readFile(
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`${dir}/build/push-manifest.json`,
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'utf8'
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);
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expect(manifest).not.toMatch(/"undefined"/);
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});
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// Issue #1675
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it('should produce correct `push-manifest.json` when user configures output filenames', async () => {
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let dir = await subject('custom-webpack');
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const config = await readFile(`${dir}/preact.config.js`, 'utf8');
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await writeFile(
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`${dir}/preact.config.js`,
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config.replace(
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"config.output.filename = '[name].js'",
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"config.output.filename = 'scripts/[name].js'"
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)
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);
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await buildFast(dir, { prerender: false });
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const manifest = await readFile(
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`${dir}/build/push-manifest.json`,
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'utf8'
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);
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expect(manifest).toEqual(
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expect.stringMatching(
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getRegExpFromMarkup(images.pushManifestAlteredFilenames)
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)
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);
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});
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});
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it('should use a custom `.env` with prefixed environment variables', async () => {
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let dir = await subject('custom-dotenv');
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await buildFast(dir);
@@ -253,22 +201,6 @@ describe('preact build', () => {
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);
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});
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it('--preload', async () => {
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let dir = await subject('preload-chunks');
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await buildFast(dir, { preload: true });
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let head = await getHead(dir);
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expect(head).toEqual(
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expect.stringMatching(getRegExpFromMarkup(images.preload.true))
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);
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await buildFast(dir, { preload: false });
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head = await getHead(dir);
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expect(head).toEqual(
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expect.stringMatching(getRegExpFromMarkup(images.preload.false))
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);
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});
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it('--prerender', async () => {
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let dir = await subject('minimal');
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‎packages/cli/tests/images/build.js‎

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@@ -28,7 +28,6 @@ exports.default = {
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'index.html': 2264,
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'manifest.json': 455,
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'preact_prerender_data.json': 11,
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'push-manifest.json': 450,
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'asset-manifest.json': 943,
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'route-home.chunk.dd4a3.js': 347,
@@ -100,45 +99,6 @@ exports.prerender.heads.custom = `
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<\\/head>
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`;
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exports.preload = {};
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exports.preload.true = `
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<head>
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<meta charset=\\"utf-8\\">
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<title>preact-preload-chunks<\\/title>
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<meta name=\\"viewport\\" content=\\"width=device-width,initial-scale=1\\">
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<meta name=\\"mobile-web-app-capable\\" content=\\"yes\\">
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<meta name=\\"apple-mobile-web-app-capable\\" content=\\"yes\\">
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<link rel=\\"apple-touch-icon\\" href=\\"\\/assets\\/icons\\/apple-touch-icon\\.png\\">
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<link rel=\\"manifest\\" href=\\"\\/manifest\\.json\\">
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<link rel=\\"preload\\" href=\\"\\/bundle\\.\\w{5}\\.js\\" as=\\"script\\">
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<link rel=\\"preload\\" href=\\"\\/route-home\\.chunk\\.\\w{5}\\.js\\" as=\\"script\\">
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<link rel=\\"preload\\" href=\\"\\/route-home\\.chunk\\.\\w{5}\\.css\\" as=\\"style\\">
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<style>html{padding:0}<\\/style>
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<link href=\\"\\/bundle\\.\\w{5}\\.css\\" rel=\\"stylesheet\\" media=\\"print\\" onload=\\"this.media='all'\\">
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<noscript>
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<link rel=\\"stylesheet\\" href=\\"\\/bundle.\\w{5}.css\\">
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</noscript>
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</head>
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`;
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exports.preload.false = `
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<head>
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<meta charset=\\"utf-8\\">
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<title>preact-preload-chunks<\\/title>
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<meta name=\\"viewport\\" content=\\"width=device-width,initial-scale=1\\">
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<meta name=\\"mobile-web-app-capable\\" content=\\"yes\\">
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<meta name=\\"apple-mobile-web-app-capable\\" content=\\"yes\\">
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<link rel=\\"apple-touch-icon\\" href=\\"\\/assets\\/icons\\/apple-touch-icon\\.png\\">
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<link rel=\\"manifest\\" href=\\"\\/manifest\\.json\\">
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<style>html{padding:0}<\\/style>
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<link href=\\"\\/bundle\\.\\w{5}\\.css\\" rel=\\"stylesheet\\" media=\\"print\\" onload=\\"this.media='all'\\">
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<noscript>
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<link rel=\\"stylesheet\\" href=\\"\\/bundle.\\w{5}.css\\">
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</noscript>
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</head>
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`;
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exports.prerender.home = `
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<body>
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<div id="app">
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</html>
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`;
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exports.pushManifest = `
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{
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"/":{
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"bundle.\\w{5}.css":{
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"type":"style",
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"weight":1
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},
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"bundle.\\w{5}.js":{
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"type":"script",
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"weight":1
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},
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"route-home.chunk.\\w{5}.js":{
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"type":"script",
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"weight":0.9
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},
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"route-home.chunk.\\w{5}.css":{
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"type":"style",
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"weight":0.9
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}
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},
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"/profile":{
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"bundle.\\w{5}.css":{
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"type":"style",
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"weight":1
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},
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"bundle.\\w{5}.js":{
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"type":"script",
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"weight":1
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},
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"route-profile.chunk.\\w{5}.js":{
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"type":"script",
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"weight":0.9
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},
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"route-profile.chunk.\\w{5}.css":{
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"type":"style",
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"weight":0.9
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}
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}
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}
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`;
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exports.pushManifestAlteredFilenames = `
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{
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"/":{
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"scripts/bundle.js":{
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"type":"script",
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"weight":1
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}
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}
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}
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`;
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exports.publicPath = `
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<!DOCTYPE html>
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<html lang="en">

‎packages/cli/tests/subjects/preload-chunks/index.js‎

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