To use gulp watch, it's required that you explicitly pass webpack in the 2nd argument for a cached compiler instance to be used on subsequent runs. In webpack-dev-server and webpack-dev-middleware watch mode is enabled by default. If you don’t pass the webpack runner function a callback, it will return a webpack Compiler instance. In addition, I recommend using a starter kit or a modern boilerplate project with webpack configuration best practices already in place. Jun 5, 2019 Usually when you run Webpack in development, you want to run it in watch mode. @piecyk Yes, can you send a PR (don't use fork) and I will finish your work, I did update to "webpack": "^5.3.2" and the error still appears. Both provide hooks for different stages of webpack's execution flow and allow you to manipulate it. Usage with gulp watch. webpack --config webpack.config.dev.js --watch And here is an example output in the terminal when I change the front.js file: Compilation starting… (node:9623) [DEP_WEBPACK_WATCH_WITHOUT_CALLBACK] DeprecationWarning: A 'callback' argument need to be provided to the 'webpack(options, callback)' function when the 'watch' option is set. Looks like 4.1.0 is out so we will try that. to your account, PR with the configuration This instance can be used to manually trigger the webpack runner or have it build and watch for changes. Turn on watch mode. Typically, webpack is configured when a project is first set up, and small tweaks are then made to the config files as needed from time to time. In every other case, webpack prints out a set of … It takes a file app.js, and compiles it into ./bin/app.min.js. There is no way to handle the 'watch' option without a callback. Follow symbolic links while looking for a file. When in watch mode, the compiler will emit the additional events such as watchRun, watchClose, and invalid. That means you can run Webpack from your Node.js scripts, like an Express server, without a task runner. When in watch mode, the compiler will emit the additional events such as watchRun, watchClose, and invalid.This is typically used in development, usually under the hood of tools like webpack-dev-server, so that the developer doesn't need to re-compile manually every time. webpack is a brilliant tool for bundling frontend assets. we could use webpack logger for logging. I hit this with the latest versions of everything and I don't have watch: true set, so I don't think this config option being duplicated is the whole story. @xccjk I did a fresh checkout of your https://github.com/xccjk/webpack-demo1 and didn't see this problem. When in watch mode, the compiler will emit the additional events such as watchRun, watchClose, and invalid.This is typically used in development, usually under the hood of tools like webpack-dev-server, so that the developer doesn't need to re-compile manually every time. By clicking “Sign up for GitHub”, you agree to our terms of service and Please note that gulp watch and webpack watch are mutually exclusive. The Compiler instance provides the following methods:.run(callback).watch(watchOptions, handler) Q&A for Work. Most developers use Webpack via the Webpack CLI, but Webpack also has an excellent Node.js API. HI , @kumaresan-subramani , it seems caused by upgrade of Uglify-js, check this https://stackoverflow.com/a/55998303/10139109 Watching. And seriously, go watch his presentation "Eveything's a plugin" right now! "webpack-cli": "^4.2.0", In watch callback, receive path to a fresh server build, created by webpack after some source file change. privacy statement. If you don’t pass the webpack runner function a callback, it will return a webpack Compiler instance. (You can use the master branch with yarn add --dev https://gitpkg.now.sh/webpack/webpack-cli/packages/webpack-cli), EDIT: which is weird because allegedly 4.1.0 was the one that fixed watch mode. In the end I tied this down to problems in our watch-run callback. Indeed, webpack v5 does not watch anymore if I remove --watch and do webpack --config webpack.config.js, Solution: With my config above the only way to go is adding --watch which I'd prefer not to, @snitin315 No, will be fixed in the near future, the next PR, Some problems on webpack side with new API, we are working on it, so I will do release with other fixes, but it will be fixed tomorrow with patch release, Same problem for me when trying to upgrade to webpack@5.1.3 and webpack-cli@4.0.0. There are a variety of reasons why webpack might miss a file change. After upgrade from webpack@4 to webpack@5 and webpack-cli@3 to webpack-cli@4.0.0 I got the following error: This error happens only when using --watch flag: The text was updated successfully, but these errors were encountered: I get the same error, but I think it's worth mentioning that the watch mode does actually work. If you don’t pass the webpack runner function a callback, it will return a webpack Compiler instance. Well, it basically what it says, sass dependency probably was outdated for sass loader, since the article is 2 years old! The method expects a path, and whatever we will pass in it will trigger a compile (and a browser refresh when DevServer is running) when saving. Just note, this is unnecessary using --watch and watch: true together, just remove watch: true from the config. Webpack allows us to use images in a very convenient way, using the file-loader loader. createVariants Alters the given baseConfig with all possible variants and maps the result into a valid webpack configuration using the given configCallback . Important note: the onAfterDone plugin API will work for (affect) the normal build mode too (i.e. But no worries, I updated all dependencies in the repository (including Webpack, it works now for the latest Webpack 5! NOTE: In watch mode notify callback provided with Node.js API will run only once when all of the builds are finished. TypeError: Cannot read property 'javascript' of undefined, webpack 5.1.3 [DEP_WEBPACK_WATCH_WITHOUT_CALLBACK] DeprecationWarning, https://github.com/microsoft/pyright/blob/master/packages/vscode-pyright/webpack.config.js, https://github.com/styled-components/vscode-styled-components/blob/master/package.json, https://gist.github.com/tkurki/5627039d52ca0248648ed383294f57f6, Run compiler in nextTick when callback provided, https://github.com/webpack/webpack-cli/blob/master/packages/webpack-cli/lib/webpack-cli.js#L219, refactor: pass a callback to webpack from webpack-cli, chore(deps-dev): bump webpack from 4.44.2 to 5.3.2, DEP_WEBPACK_WATCH_WITHOUT_CALLBACK when watch is true, Fix for webpack 5 watch mode deprecation: DEP_WEBPACK_WATCH_WITHOUT_CALLBACK, Warnings + error messages with hot reload + yarn v2, Using bundleCommand instead of createCompiler in webpack-cli/serve, [DEP_WEBPACK_WATCH_WITHOUT_CALLBACK] error when using webpack serve with --watch flag. Successfully merging a pull request may close this issue. This instance can be used to manually trigger the webpack runner or have it build and watch for changes, much like the CLI. The Compiler supports watching which monitors the file system and recompiles as files change. watch === true & callback, the watch thread is opened compiler.watch(watchOptions, callback); compiler.run(callback); return compiler; }; The entry file of webpack is actually an example.CompilerAnd calledrunMethod opens compilation, and the compilation of webpack is performed in the following order of hook calls. Returns a Watching … The code contains comments that explain how it utilizes the preprocessor API. Have a question about this project? Much like the CLI Api. We want our browser to refresh when we save some file that's not in the bundle's scope. It is exported by webpack api under webpack.Compiler.. ), … 2.6.0: issue 777, issue 778, Webpack 5 migration. invalidate() Instructs a webpack-dev-middleware instance to recompile the bundle. If progress shows on save but no files are outputted, it is likely a configuration issue, not a file watching issue.
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