From f27adb8ccf335b7274fdfd44265d74a732c1e61b Mon Sep 17 00:00:00 2001 From: Mari Date: Mon, 13 Sep 2021 17:45:25 -0400 Subject: [PATCH] Add some client stuff --- .gitignore | 16 +- .idea/protoeditor.xml | 2 +- README.md | 46 - client/config/env.js | 106 + client/config/getHttpsConfig.js | 66 + client/config/jest/babelTransform.js | 29 + client/config/jest/cssTransform.js | 14 + client/config/jest/fileTransform.js | 40 + client/config/modules.js | 134 + client/config/paths.js | 75 + client/config/pnpTs.js | 35 + client/config/webpack.config.js | 757 ++++ client/config/webpackDevServer.config.js | 130 + package-lock.json => client/package-lock.json | 3196 +++++++++-------- client/package.json | 165 + {public => client/public}/favicon.ico | Bin {public => client/public}/index.html | 0 {public => client/public}/logo192.png | Bin {public => client/public}/logo512.png | Bin {public => client/public}/manifest.json | 0 {public => client/public}/robots.txt | 0 client/scripts/build.js | 212 ++ client/scripts/start.js | 166 + client/scripts/test.js | 53 + {src => client/src}/index.tsx | 0 client/src/react-app-env.d.ts | 71 + .../src}/reducers/AppStateReducer.ts | 16 +- {src => client/src}/reducers/ClientReducer.ts | 2 +- .../src}/reducers/NetworkReducer.ts | 8 +- {src => client/src}/reducers/ServerReducer.ts | 8 +- {src => client/src}/reducers/TileReducer.ts | 6 +- {src => client/src}/setupTests.ts | 0 {src => client/src}/state/AppState.ts | 2 +- {src => client/src}/state/NetworkState.ts | 4 +- {src => client/src}/ui/App.css | 0 {src => client/src}/ui/App.test.tsx | 0 {src => client/src}/ui/App.tsx | 6 +- .../src}/ui/DOMWebsocketTranslator.ts | 12 +- {src => client/src}/ui/EntryPoint.css | 0 {src => client/src}/ui/EntryPoint.tsx | 0 {src => client/src}/ui/HexColorPicker.tsx | 6 +- {src => client/src}/ui/HexMapRenderer.tsx | 4 +- {src => client/src}/ui/HexTileRenderer.tsx | 6 +- .../src}/ui/WebsocketReactAdapter.tsx | 4 +- .../src}/ui/context/DispatchContext.ts | 2 +- {src => client/src}/ui/reportWebVitals.ts | 0 client/tsconfig.json | 14 + {proto => common/proto}/action.proto | 0 {proto => common/proto}/client.proto | 0 {proto => common/proto}/coords.proto | 0 {proto => common/proto}/map.proto | 0 {proto => common/proto}/server.proto | 0 {proto => common/proto}/state.proto | 0 {proto => common/proto}/user.proto | 0 {src => common/src}/actions/AppAction.ts | 0 {src => common/src}/actions/BaseAction.ts | 0 {src => common/src}/actions/CellAction.ts | 0 {src => common/src}/actions/ClientAction.ts | 0 {src => common/src}/actions/MapAction.ts | 0 {src => common/src}/actions/NetworkAction.ts | 0 {src => common/src}/actions/ServerAction.ts | 0 {src => common/src}/actions/TileAction.ts | 0 {src => common/src}/actions/UserAction.ts | 0 {src => common/src}/pbconv/ClientToPb.ts | 0 {src => common/src}/pbconv/MapFromPb.ts | 0 {src => common/src}/pbconv/MapToPb.ts | 0 {src => common/src}/pbconv/ServerFromPb.ts | 0 .../src}/pbconv/SyncableActionFromPb.ts | 0 .../src}/pbconv/SyncableActionToPb.ts | 0 {src => common/src}/reducers/HexMapReducer.ts | 0 .../src}/reducers/SyncedStateReducer.ts | 0 {src => common/src}/reducers/UserReducer.ts | 0 {src => common/src}/state/Coordinates.ts | 0 {src => common/src}/state/HexMap.ts | 0 {src => common/src}/state/SyncedState.ts | 0 {src => common/src}/state/UserState.ts | 0 {src => common/src}/util/ArrayUtils.ts | 0 {src => common/src}/util/ColorUtils.ts | 0 {src => common/src}/util/TypeUtils.ts | 0 tsconfig.json => common/tsconfig.json | 4 +- package.json | 50 - src/react-app-env.d.ts | 1 - src/ui/tsconfig.json | 9 - 83 files changed, 3871 insertions(+), 1606 deletions(-) delete mode 100644 README.md create mode 100644 client/config/env.js create mode 100644 client/config/getHttpsConfig.js create mode 100644 client/config/jest/babelTransform.js create mode 100644 client/config/jest/cssTransform.js create mode 100644 client/config/jest/fileTransform.js create mode 100644 client/config/modules.js create mode 100644 client/config/paths.js create mode 100644 client/config/pnpTs.js create mode 100644 client/config/webpack.config.js create mode 100644 client/config/webpackDevServer.config.js rename package-lock.json => client/package-lock.json (95%) create mode 100644 client/package.json rename {public => client/public}/favicon.ico (100%) rename {public => client/public}/index.html (100%) rename {public => client/public}/logo192.png (100%) rename {public => client/public}/logo512.png (100%) rename {public => client/public}/manifest.json (100%) rename {public => client/public}/robots.txt (100%) create mode 100644 client/scripts/build.js create mode 100644 client/scripts/start.js create mode 100644 client/scripts/test.js rename {src => client/src}/index.tsx (100%) create mode 100644 client/src/react-app-env.d.ts rename {src => client/src}/reducers/AppStateReducer.ts (65%) rename {src => client/src}/reducers/ClientReducer.ts (97%) rename {src => client/src}/reducers/NetworkReducer.ts (68%) rename {src => client/src}/reducers/ServerReducer.ts (97%) rename {src => client/src}/reducers/TileReducer.ts (79%) rename {src => client/src}/setupTests.ts (100%) rename {src => client/src}/state/AppState.ts (78%) rename {src => client/src}/state/NetworkState.ts (96%) rename {src => client/src}/ui/App.css (100%) rename {src => client/src}/ui/App.test.tsx (100%) rename {src => client/src}/ui/App.tsx (92%) rename {src => client/src}/ui/DOMWebsocketTranslator.ts (90%) rename {src => client/src}/ui/EntryPoint.css (100%) rename {src => client/src}/ui/EntryPoint.tsx (100%) rename {src => client/src}/ui/HexColorPicker.tsx (91%) rename {src => client/src}/ui/HexMapRenderer.tsx (78%) rename {src => client/src}/ui/HexTileRenderer.tsx (88%) rename {src => client/src}/ui/WebsocketReactAdapter.tsx (95%) rename {src => client/src}/ui/context/DispatchContext.ts (53%) rename {src => client/src}/ui/reportWebVitals.ts (100%) create mode 100644 client/tsconfig.json rename {proto => common/proto}/action.proto (100%) rename {proto => common/proto}/client.proto (100%) rename {proto => common/proto}/coords.proto (100%) rename {proto => common/proto}/map.proto (100%) rename {proto => common/proto}/server.proto (100%) rename {proto => common/proto}/state.proto (100%) rename {proto => common/proto}/user.proto (100%) rename {src => common/src}/actions/AppAction.ts (100%) rename {src => common/src}/actions/BaseAction.ts (100%) rename {src => common/src}/actions/CellAction.ts (100%) rename {src => common/src}/actions/ClientAction.ts (100%) rename {src => common/src}/actions/MapAction.ts (100%) rename {src => common/src}/actions/NetworkAction.ts (100%) rename {src => common/src}/actions/ServerAction.ts (100%) rename {src => common/src}/actions/TileAction.ts (100%) rename {src => common/src}/actions/UserAction.ts (100%) rename {src => common/src}/pbconv/ClientToPb.ts (100%) rename {src => common/src}/pbconv/MapFromPb.ts (100%) rename {src => common/src}/pbconv/MapToPb.ts (100%) rename {src => common/src}/pbconv/ServerFromPb.ts (100%) rename {src => common/src}/pbconv/SyncableActionFromPb.ts (100%) rename {src => common/src}/pbconv/SyncableActionToPb.ts (100%) rename {src => common/src}/reducers/HexMapReducer.ts (100%) rename {src => common/src}/reducers/SyncedStateReducer.ts (100%) rename {src => common/src}/reducers/UserReducer.ts (100%) rename {src => common/src}/state/Coordinates.ts (100%) rename {src => common/src}/state/HexMap.ts (100%) rename {src => common/src}/state/SyncedState.ts (100%) rename {src => common/src}/state/UserState.ts (100%) rename {src => common/src}/util/ArrayUtils.ts (100%) rename {src => common/src}/util/ColorUtils.ts (100%) rename {src => common/src}/util/TypeUtils.ts (100%) rename tsconfig.json => common/tsconfig.json (92%) delete mode 100644 package.json delete mode 100644 src/react-app-env.d.ts delete mode 100644 src/ui/tsconfig.json diff --git a/.gitignore b/.gitignore index 97ff4e2..58a119e 100644 --- a/.gitignore +++ b/.gitignore @@ -1,16 +1,30 @@ # dependencies /node_modules +/client/node_modules +/common/node_modules +/server/node_modules + /.pnp +/client/.pnp +/common/.pnp +/server/.pnp + .pnp.js # testing /coverage +/client/coverage +/common/coverage +/server/coverage # production /build +/client/build +/common/build +/server/build # Generated protocol buffers files -/src/proto +/common/src/proto # misc .DS_Store diff --git a/.idea/protoeditor.xml b/.idea/protoeditor.xml index d2a93c6..803df8c 100644 --- a/.idea/protoeditor.xml +++ b/.idea/protoeditor.xml @@ -8,7 +8,7 @@ diff --git a/README.md b/README.md deleted file mode 100644 index b87cb00..0000000 --- a/README.md +++ /dev/null @@ -1,46 +0,0 @@ -# Getting Started with Create React App - -This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app). - -## Available Scripts - -In the project directory, you can run: - -### `npm start` - -Runs the app in the development mode.\ -Open [http://localhost:3000](http://localhost:3000) to view it in the browser. - -The page will reload if you make edits.\ -You will also see any lint errors in the console. - -### `npm test` - -Launches the test runner in the interactive watch mode.\ -See the section about [running tests](https://facebook.github.io/create-react-app/docs/running-tests) for more information. - -### `npm run build` - -Builds the app for production to the `build` folder.\ -It correctly bundles React in production mode and optimizes the build for the best performance. - -The build is minified and the filenames include the hashes.\ -Your app is ready to be deployed! - -See the section about [deployment](https://facebook.github.io/create-react-app/docs/deployment) for more information. - -### `npm run eject` - -**Note: this is a one-way operation. Once you `eject`, you can’t go back!** - -If you aren’t satisfied with the build tool and configuration choices, you can `eject` at any time. This command will remove the single build dependency from your project. - -Instead, it will copy all the configuration files and the transitive dependencies (webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except `eject` will still work, but they will point to the copied scripts so you can tweak them. At this point you’re on your own. - -You don’t have to ever use `eject`. The curated feature set is suitable for small and middle deployments, and you shouldn’t feel obligated to use this feature. However we understand that this tool wouldn’t be useful if you couldn’t customize it when you are ready for it. - -## Learn More - -You can learn more in the [Create React App documentation](https://facebook.github.io/create-react-app/docs/getting-started). - -To learn React, check out the [React documentation](https://reactjs.org/). diff --git a/client/config/env.js b/client/config/env.js new file mode 100644 index 0000000..3d1411b --- /dev/null +++ b/client/config/env.js @@ -0,0 +1,106 @@ +'use strict'; + +const fs = require('fs'); +const path = require('path'); +const paths = require('./paths'); + +// Make sure that including paths.js after env.js will read .env variables. +delete require.cache[require.resolve('./paths')]; + +const NODE_ENV = process.env.NODE_ENV; +if (!NODE_ENV) { + throw new Error( + 'The NODE_ENV environment variable is required but was not specified.' + ); +} + +// https://github.com/bkeepers/dotenv#what-other-env-files-can-i-use +const dotenvFiles = [ + `${paths.dotenv}.${NODE_ENV}.local`, + // Don't include `.env.local` for `test` environment + // since normally you expect tests to produce the same + // results for everyone + NODE_ENV !== 'test' && `${paths.dotenv}.local`, + `${paths.dotenv}.${NODE_ENV}`, + paths.dotenv, +].filter(Boolean); + +// Load environment variables from .env* files. Suppress warnings using silent +// if this file is missing. dotenv will never modify any environment variables +// that have already been set. Variable expansion is supported in .env files. +// https://github.com/motdotla/dotenv +// https://github.com/motdotla/dotenv-expand +dotenvFiles.forEach(dotenvFile => { + if (fs.existsSync(dotenvFile)) { + require('dotenv-expand')( + require('dotenv').config({ + path: dotenvFile, + }) + ); + } +}); + +// We support resolving modules according to `NODE_PATH`. +// This lets you use absolute paths in imports inside large monorepos: +// https://github.com/facebook/create-react-app/issues/253. +// It works similar to `NODE_PATH` in Node itself: +// https://nodejs.org/api/modules.html#modules_loading_from_the_global_folders +// Note that unlike in Node, only *relative* paths from `NODE_PATH` are honored. +// Otherwise, we risk importing Node.js core modules into an app instead of webpack shims. +// https://github.com/facebook/create-react-app/issues/1023#issuecomment-265344421 +// We also resolve them to make sure all tools using them work consistently. +const appDirectory = fs.realpathSync(process.cwd()); +process.env.NODE_PATH = (process.env.NODE_PATH || '') + .split(path.delimiter) + .filter(folder => folder && !path.isAbsolute(folder)) + .map(folder => path.resolve(appDirectory, folder)) + .join(path.delimiter); + +// Grab NODE_ENV and REACT_APP_* environment variables and prepare them to be +// injected into the application via DefinePlugin in webpack configuration. +const REACT_APP = /^REACT_APP_/i; + +function getClientEnvironment(publicUrl) { + const raw = Object.keys(process.env) + .filter(key => REACT_APP.test(key)) + .reduce( + (env, key) => { + env[key] = process.env[key]; + return env; + }, + { + // Useful for determining whether we’re running in production mode. + // Most importantly, it switches React into the correct mode. + NODE_ENV: process.env.NODE_ENV || 'development', + // Useful for resolving the correct path to static assets in `public`. + // For example, . + // This should only be used as an escape hatch. Normally you would put + // images into the `src` and `import` them in code to get their paths. + PUBLIC_URL: publicUrl, + // We support configuring the sockjs pathname during development. + // These settings let a developer run multiple simultaneous projects. + // They are used as the connection `hostname`, `pathname` and `port` + // in webpackHotDevClient. They are used as the `sockHost`, `sockPath` + // and `sockPort` options in webpack-dev-server. + WDS_SOCKET_HOST: process.env.WDS_SOCKET_HOST, + WDS_SOCKET_PATH: process.env.WDS_SOCKET_PATH, + WDS_SOCKET_PORT: process.env.WDS_SOCKET_PORT, + // Whether or not react-refresh is enabled. + // react-refresh is not 100% stable at this time, + // which is why it's disabled by default. + // It is defined here so it is available in the webpackHotDevClient. + FAST_REFRESH: process.env.FAST_REFRESH !== 'false', + } + ); + // Stringify all values so we can feed into webpack DefinePlugin + const stringified = { + 'process.env': Object.keys(raw).reduce((env, key) => { + env[key] = JSON.stringify(raw[key]); + return env; + }, {}), + }; + + return { raw, stringified }; +} + +module.exports = getClientEnvironment; diff --git a/client/config/getHttpsConfig.js b/client/config/getHttpsConfig.js new file mode 100644 index 0000000..013d493 --- /dev/null +++ b/client/config/getHttpsConfig.js @@ -0,0 +1,66 @@ +'use strict'; + +const fs = require('fs'); +const path = require('path'); +const crypto = require('crypto'); +const chalk = require('react-dev-utils/chalk'); +const paths = require('./paths'); + +// Ensure the certificate and key provided are valid and if not +// throw an easy to debug error +function validateKeyAndCerts({ cert, key, keyFile, crtFile }) { + let encrypted; + try { + // publicEncrypt will throw an error with an invalid cert + encrypted = crypto.publicEncrypt(cert, Buffer.from('test')); + } catch (err) { + throw new Error( + `The certificate "${chalk.yellow(crtFile)}" is invalid.\n${err.message}` + ); + } + + try { + // privateDecrypt will throw an error with an invalid key + crypto.privateDecrypt(key, encrypted); + } catch (err) { + throw new Error( + `The certificate key "${chalk.yellow(keyFile)}" is invalid.\n${ + err.message + }` + ); + } +} + +// Read file and throw an error if it doesn't exist +function readEnvFile(file, type) { + if (!fs.existsSync(file)) { + throw new Error( + `You specified ${chalk.cyan( + type + )} in your env, but the file "${chalk.yellow(file)}" can't be found.` + ); + } + return fs.readFileSync(file); +} + +// Get the https config +// Return cert files if provided in env, otherwise just true or false +function getHttpsConfig() { + const { SSL_CRT_FILE, SSL_KEY_FILE, HTTPS } = process.env; + const isHttps = HTTPS === 'true'; + + if (isHttps && SSL_CRT_FILE && SSL_KEY_FILE) { + const crtFile = path.resolve(paths.appPath, SSL_CRT_FILE); + const keyFile = path.resolve(paths.appPath, SSL_KEY_FILE); + const config = { + cert: readEnvFile(crtFile, 'SSL_CRT_FILE'), + key: readEnvFile(keyFile, 'SSL_KEY_FILE'), + }; + + validateKeyAndCerts({ ...config, keyFile, crtFile }); + return config; + } + return isHttps; +} + +module.exports = getHttpsConfig; diff --git a/client/config/jest/babelTransform.js b/client/config/jest/babelTransform.js new file mode 100644 index 0000000..dabf5a8 --- /dev/null +++ b/client/config/jest/babelTransform.js @@ -0,0 +1,29 @@ +'use strict'; + +const babelJest = require('babel-jest'); + +const hasJsxRuntime = (() => { + if (process.env.DISABLE_NEW_JSX_TRANSFORM === 'true') { + return false; + } + + try { + require.resolve('react/jsx-runtime'); + return true; + } catch (e) { + return false; + } +})(); + +module.exports = babelJest.createTransformer({ + presets: [ + [ + require.resolve('babel-preset-react-app'), + { + runtime: hasJsxRuntime ? 'automatic' : 'classic', + }, + ], + ], + babelrc: false, + configFile: false, +}); diff --git a/client/config/jest/cssTransform.js b/client/config/jest/cssTransform.js new file mode 100644 index 0000000..8f65114 --- /dev/null +++ b/client/config/jest/cssTransform.js @@ -0,0 +1,14 @@ +'use strict'; + +// This is a custom Jest transformer turning style imports into empty objects. +// http://facebook.github.io/jest/docs/en/webpack.html + +module.exports = { + process() { + return 'module.exports = {};'; + }, + getCacheKey() { + // The output is always the same. + return 'cssTransform'; + }, +}; diff --git a/client/config/jest/fileTransform.js b/client/config/jest/fileTransform.js new file mode 100644 index 0000000..aab6761 --- /dev/null +++ b/client/config/jest/fileTransform.js @@ -0,0 +1,40 @@ +'use strict'; + +const path = require('path'); +const camelcase = require('camelcase'); + +// This is a custom Jest transformer turning file imports into filenames. +// http://facebook.github.io/jest/docs/en/webpack.html + +module.exports = { + process(src, filename) { + const assetFilename = JSON.stringify(path.basename(filename)); + + if (filename.match(/\.svg$/)) { + // Based on how SVGR generates a component name: + // https://github.com/smooth-code/svgr/blob/01b194cf967347d43d4cbe6b434404731b87cf27/packages/core/src/state.js#L6 + const pascalCaseFilename = camelcase(path.parse(filename).name, { + pascalCase: true, + }); + const componentName = `Svg${pascalCaseFilename}`; + return `const React = require('react'); + module.exports = { + __esModule: true, + default: ${assetFilename}, + ReactComponent: React.forwardRef(function ${componentName}(props, ref) { + return { + $$typeof: Symbol.for('react.element'), + type: 'svg', + ref: ref, + key: null, + props: Object.assign({}, props, { + children: ${assetFilename} + }) + }; + }), + };`; + } + + return `module.exports = ${assetFilename};`; + }, +}; diff --git a/client/config/modules.js b/client/config/modules.js new file mode 100644 index 0000000..d63e41d --- /dev/null +++ b/client/config/modules.js @@ -0,0 +1,134 @@ +'use strict'; + +const fs = require('fs'); +const path = require('path'); +const paths = require('./paths'); +const chalk = require('react-dev-utils/chalk'); +const resolve = require('resolve'); + +/** + * Get additional module paths based on the baseUrl of a compilerOptions object. + * + * @param {Object} options + */ +function getAdditionalModulePaths(options = {}) { + const baseUrl = options.baseUrl; + + if (!baseUrl) { + return ''; + } + + const baseUrlResolved = path.resolve(paths.appPath, baseUrl); + + // We don't need to do anything if `baseUrl` is set to `node_modules`. This is + // the default behavior. + if (path.relative(paths.appNodeModules, baseUrlResolved) === '') { + return null; + } + + // Allow the user set the `baseUrl` to `appSrc`. + if (path.relative(paths.appSrc, baseUrlResolved) === '') { + return [paths.appSrc]; + } + + // If the path is equal to the root directory we ignore it here. + // We don't want to allow importing from the root directly as source files are + // not transpiled outside of `src`. We do allow importing them with the + // absolute path (e.g. `src/Components/Button.js`) but we set that up with + // an alias. + if (path.relative(paths.appPath, baseUrlResolved) === '') { + return null; + } + + // Otherwise, throw an error. + throw new Error( + chalk.red.bold( + "Your project's `baseUrl` can only be set to `src` or `node_modules`." + + ' Create React App does not support other values at this time.' + ) + ); +} + +/** + * Get webpack aliases based on the baseUrl of a compilerOptions object. + * + * @param {*} options + */ +function getWebpackAliases(options = {}) { + const baseUrl = options.baseUrl; + + if (!baseUrl) { + return {}; + } + + const baseUrlResolved = path.resolve(paths.appPath, baseUrl); + + if (path.relative(paths.appPath, baseUrlResolved) === '') { + return { + src: paths.appSrc, + }; + } +} + +/** + * Get jest aliases based on the baseUrl of a compilerOptions object. + * + * @param {*} options + */ +function getJestAliases(options = {}) { + const baseUrl = options.baseUrl; + + if (!baseUrl) { + return {}; + } + + const baseUrlResolved = path.resolve(paths.appPath, baseUrl); + + if (path.relative(paths.appPath, baseUrlResolved) === '') { + return { + '^src/(.*)$': '/src/$1', + }; + } +} + +function getModules() { + // Check if TypeScript is setup + const hasTsConfig = fs.existsSync(paths.appTsConfig); + const hasJsConfig = fs.existsSync(paths.appJsConfig); + + if (hasTsConfig && hasJsConfig) { + throw new Error( + 'You have both a tsconfig.json and a jsconfig.json. If you are using TypeScript please remove your jsconfig.json file.' + ); + } + + let config; + + // If there's a tsconfig.json we assume it's a + // TypeScript project and set up the config + // based on tsconfig.json + if (hasTsConfig) { + const ts = require(resolve.sync('typescript', { + basedir: paths.appNodeModules, + })); + config = ts.readConfigFile(paths.appTsConfig, ts.sys.readFile).config; + // Otherwise we'll check if there is jsconfig.json + // for non TS projects. + } else if (hasJsConfig) { + config = require(paths.appJsConfig); + } + + config = config || {}; + const options = config.compilerOptions || {}; + + const additionalModulePaths = getAdditionalModulePaths(options); + + return { + additionalModulePaths: additionalModulePaths, + webpackAliases: getWebpackAliases(options), + jestAliases: getJestAliases(options), + hasTsConfig, + }; +} + +module.exports = getModules(); diff --git a/client/config/paths.js b/client/config/paths.js new file mode 100644 index 0000000..4e3d30e --- /dev/null +++ b/client/config/paths.js @@ -0,0 +1,75 @@ +'use strict'; + +const path = require('path'); +const fs = require('fs'); +const getPublicUrlOrPath = require('react-dev-utils/getPublicUrlOrPath'); + +// Make sure any symlinks in the project folder are resolved: +// https://github.com/facebook/create-react-app/issues/637 +const appDirectory = fs.realpathSync(process.cwd()); +const resolveApp = relativePath => path.resolve(appDirectory, relativePath); + +// We use `PUBLIC_URL` environment variable or "homepage" field to infer +// "public path" at which the app is served. +// webpack needs to know it to put the right