Rollup cover license tag

Usually we just keep the tag holder on the vehicle from when we purchased the car. We become driving billboards for their dealership. These tag holder often cover parts of the tag in violation of If you are arguing with the officer that you think you can see all the portions of your tag that need to be seen, you have already lost.

Display your team loyalty, collegiate affiliation real or imagined , fraternal organization, etc. You can use this for instance as a mechanism to define custom proxy modules for entry points.

The following plugin will only expose the default export from entry points while still keeping named exports available for internal usage:. Returning null defers to other resolveId functions and eventually the default resolution behavior.

Returning false signals that source should be treated as an external module and not included in the bundle. If this happens for a relative import, the id will be renormalized the same way as when the external option is used. If you return an object, then it is possible to resolve an import to a different id while excluding it from the bundle at the same time. This allows you to replace dependencies with external dependencies without the need for the user to mark them as "external" manually via the external option:.

If external is true , then absolute ids will be converted to relative ids based on the user's choice for the makeAbsoluteExternalsRelative option. This choice can be overridden by passing either external: "relative" to always convert an absolute id to a relative id or external: "absolute" to keep it as an absolute id.

When returning an object, relative external ids, i. If you want relative ids to be renormalised and deduplicated instead, return an absolute file system location as id and choose external: "relative". If false is returned for moduleSideEffects in the first hook that resolves a module id and no other module imports anything from this module, then this module will not be included even if the module would have side-effects.

If null is returned or the flag is omitted, then moduleSideEffects will be determined by the treeshake. The load and transform hooks can override this. If null is returned or the flag is omitted, then syntheticNamedExports will default to false. If null is returned or the option is omitted, then meta will default to an empty object.

The load and transform hooks can add or replace properties of this object. Note that while resolveId will be called for each import of a module and can therefore resolve to the same id many times, values for external , moduleSideEffects , syntheticNamedExports or meta can only be set once before the module is loaded.

The reason is that after this call, Rollup will continue with the load and transform hooks for that module that may override these values and should take precedence if they do so. When triggering this hook from a plugin via this. While this object will be passed unmodified, plugins should follow the convention of adding a custom property with an object where the keys correspond to the names of the plugins that the options are intended for.

For details see custom resolver options. NextHook: moduleParsed once the file has been processed and parsed. Can be used to transform individual modules. Note that in watch mode, the result of this hook is cached when rebuilding and the hook is only triggered again for a module id if either the code of the module has changed or a file has changed that was added via this. You can also use the object form of the return value to configure additional properties of the module.

Note that it's possible to return only properties and no code transformations. If false is returned for moduleSideEffects and no other module imports anything from this module, then this module will not be included even if the module would have side-effects. If null is returned or the flag is omitted, then moduleSideEffects will be determined by the load hook that loaded this module, the first resolveId hook that resolved this module, the treeshake.

If null is returned or the flag is omitted, then syntheticNamedExports will be determined by the load hook that loaded this module, the first resolveId hook that resolved this module, the treeshake.

If null is returned or the option is omitted, then meta will be determined by the load hook that loaded this module, the first resolveId hook that resolved this module or eventually default to an empty object.

If that is the case, the current build will still proceed but a new build will be scheduled to start once the current build has completed, starting again with options. Notifies a plugin whenever rollup has detected a change to a monitored file in --watch mode. Second argument contains additional details of change event. Output generation hooks can provide information about a generated bundle and modify a build once complete.

They work the same way and have the same types as Build Hooks but are called separately for each call to bundle. Plugins that only use output generation hooks can also be passed in via the output options and therefore run only for certain outputs.

The first hook of the output generation phase is outputOptions , the last one is either generateBundle if the output was successfully generated via bundle.

Additionally, closeBundle can be called as the very last hook, but it is the responsibility of the User to manually call bundle. The CLI will always make sure this is the case. Next Hook: resolveFileUrl for each use of import.

Can be used to augment the hash of individual chunks. Called for each Rollup output chunk. Returning a falsy value will not modify the hash. Truthy values will be passed to hash. The chunkInfo is a reduced version of the one in generateBundle without properties that rely on file names. The following plugin will invalidate the hash of chunk foo with the timestamp of the last build:.

Can be used to clean up any external service that may be running. For that reason, any plugin relying on this feature should carefully mention this in its documentation. If a plugin wants to retain resources across builds in watch mode, they can check for this. Next Hook: writeBundle if the output was generated via bundle. Called at the end of bundle. To modify the files after they have been written, use the writeBundle hook. You can prevent files from being emitted by deleting them from the bundle object in this hook.

To emit additional files, use the this. This is the first hook of the output generation phase. Next Hook: renderStart. Replaces or manipulates the output options object passed to bundle. If you just need to read the output options, it is recommended to use the renderStart hook as this hook has access to the output options after the transformations from all outputOptions hooks have been taken into account.

Next Hook: generateBundle. Can be used to transform individual chunks. Called for each Rollup output chunk file. Returning null will apply no transformations.

Next Hook: augmentChunkHash for each chunk that would contain a hash in the file name. This hook provides fine-grained control over how dynamic imports are rendered by providing replacements for the code to the left import and right of the argument of the import expression. Returning null defers to other hooks of this type and ultimately renders a format-specific default. If the import could be resolved to an internal or external id, then targetModuleId will be set to this id, otherwise it will be null.

If the dynamic import contained a non-string expression that was resolved by a resolveDynamicImport hook to a replacement string, then customResolution will contain that string. The following code will replace all dynamic imports with a custom handler, adding import. The next plugin will make sure all dynamic imports of esm-lib are marked as external and retained as import expressions to e.

Note that when this hook rewrites dynamic imports in non-ES formats, no interop code to make sure that e. It is the responsibility of the plugin to make sure the rewritten dynamic import returns a Promise that resolves to a proper namespace object.

Next Hook: If it is called, this is the last hook of the output generation phase and may again be followed by outputOptions if another output is generated. Called when rollup encounters an error during bundle. The error is passed to this hook.

To get notified when generation completes successfully, use the generateBundle hook. Called initially each time bundle.

To get notified when generation has completed, use the generateBundle and renderError hooks. This is the recommended hook to use when you need access to the output options passed to bundle. It also receives the input options passed to rollup. Next Hook: renderChunk for each chunk. Allows to customize how Rollup resolves URLs of files that were emitted by plugins via this.

By default, Rollup will generate code for import. In case that fails or to generate more optimized code, this hook can be used to customize this behaviour. To do that, the following information is available:.

Note that since this hook has access to the filename of the current chunk, its return value will not be considered when generating the hash of this chunk. Allows to customize how Rollup handles import. In ES modules, import. By default for formats other than ES modules, Rollup replaces import. For other properties, import.

This behaviour can be changed—also for ES modules—via this hook. For each occurrence of import. For example, the following code will resolve import. Called only at the end of bundle. Similar to the generateBundle hook, bundle provides the full list of files being written along with their details.

A number of utility functions and informational bits can be accessed from within most hooks via this :. Adds additional files to be monitored in watch mode so that changes to these files will trigger rebuilds. This context function can only be used in hooks during the build phase, i. Note: Usually in watch mode to improve rebuild speed, the transform hook will only be triggered for a given module if its contents actually changed.

Using this. In general, it is recommended to use this. Emits a new file that is included in the build output and returns a referenceId that can be used in various places to reference the emitted file.

In both cases, either a name or a fileName can be supplied. If a fileName is provided, it will be used unmodified as the name of the generated file, throwing an error if this causes a conflict. Otherwise if a name is supplied, this will be used as substitution for [name] in the corresponding output.

If neither a name nor fileName is supplied, a default name will be used. You can reference the URL of an emitted file in any code returned by a load or transform plugin hook via import. See File URLs for more details and an example. The generated code that replaces import. You can also use this. If the type is chunk , then this emits a new chunk with the given module id as entry point. To resolve it, the id will be passed through build hooks just like regular entry points, starting with resolveId.

If an importer is provided, this acts as the second parameter of resolveId and is important to properly resolve relative paths. If it is not provided, paths will be resolved relative to the current working directory.

If a value for preserveSignature is provided, this will override preserveEntrySignatures for this particular chunk. This will not result in duplicate modules in the graph, instead if necessary, existing chunks will be split or a facade chunk with reexports will be created.

Chunks with a specified fileName will always generate separate chunks while other emitted chunks may be deduplicated with existing chunks even if the name does not match. If such a chunk is not deduplicated, the output. By default, Rollup assumes that emitted chunks are executed independent of other entry points, possibly even before any other code is executed.

This means that if an emitted chunk shares a dependency with an existing entry point, Rollup will create an additional chunk for dependencies that are shared between those entry points. Providing a non-empty array of module ids for implicitlyLoadedAfterOneOf will change that behaviour by giving Rollup additional information to prevent this in some cases.

Those ids will be resolved the same way as the id property, respecting the importer property if it is provided. Rollup will now assume that the emitted chunk is only executed if at least one of the entry points that lead to one of the ids in implicitlyLoadedAfterOneOf being loaded has already been executed, creating the same chunks as if the newly emitted chunk was only reachable via dynamic import from the modules in implicitlyLoadedAfterOneOf.

Here is an example that uses this to create a simple HTML file with several scripts, creating optimized chunks to respect their execution order:. Note that even though any module id can be used in implicitlyLoadedAfterOneOf , Rollup will throw an error if such an id cannot be uniquely associated with a chunk, e. Using only entry points, either defined by the user or of previously emitted chunks, will always work, though. If the type is asset , then this emits an arbitrary new file with the given source as content.

It is possible to defer setting the source via this. Assets with a specified fileName will always generate separate files while other emitted assets may be deduplicated with existing assets if they have the same source even if the name does not match. If such an asset is not deduplicated, the output. Type: error: string Error, position? Structurally equivalent to this.

Get the combined source maps of all previous plugins. This context function can only be used in the transform plugin hook. Get the file name of a chunk or asset that has been emitted via this.

The file name will be relative to outputOptions. Returns an Iterator that gives access to all module ids in the current graph. It can be iterated via. During the build, this object represents currently available information about the module. Before the buildEnd hook, this information may be incomplete as e. Get ids of the files which has been watched previously. Include both files added by plugins with this. Loads and parses the module corresponding to the given id, attaching additional meta information to the module if provided.

This will trigger the same load , transform and moduleParsed hooks that would be triggered if the module were imported by another module. This allows you to inspect the final content of modules before deciding how to resolve them in the resolveId hook and e. If the module becomes part of the graph later, there is no additional overhead from using this context function as the module will not be parsed again.

The signature allows you to directly pass the return value of this. The returned promise will resolve once the module has been fully transformed and parsed but before any imports have been resolved.

This helps to avoid deadlock situations when awaiting this. If you are interested in importedIds and dynamicallyImportedIds , you should implement a moduleParsed hook. Note that with regard to the moduleSideEffects , syntheticNamedExports and meta options, the same restrictions apply as for the resolveId hook: Their values only have an effect if the module has not been loaded yet. Thus, it is very important to use this. The example below showcases how this can be handled to add a proxy module for modules containing a special code comment:.

If the module was already loaded, this will just wait for the parsing to complete and then return its module information. If the module was not yet imported by another module, this will not automatically trigger loading other modules imported by this module. Instead, static and dynamic dependencies will only be loaded once this module has actually been imported at least once. While it is safe to use this. If there are cyclic dependencies in the module graph, this can easily lead to a deadlock, so any plugin needs to manually take care to avoid waiting for this.

Type: code: string, acornOptions? Type: source: string, importer? Resolve imports to module ids i. If null is returned, the import could not be resolved by Rollup or any plugin but was not explicitly marked as external by the user. If an absolute external id is returned that should remain absolute in the output either via the makeAbsoluteExternalsRelative option or by explicit plugin choice in the resolveId hook, external will be "absolute" instead of true. If you pass skipSelf: true , then the resolveId hook of the plugin from which this.

When other plugins themselves also call this. The rationale here is that the plugin already stated that it "does not know" how to resolve this particular combination of source and importer at this point in time. If you do not want this behaviour, do not use skipSelf but implement your own infinite loop prevention mechanism if necessary. You can also pass an object of plugin-specific options via the custom option, see custom resolver options for details.

The value for isEntry you pass here will be passed along to the resolveId hooks handling this call, otherwise false will be passed if there is an importer and true if there is not. When calling this function from a resolveId hook, you should always check if it makes sense for you to pass along the isEntry and custom options.

Set the deferred source of an asset. Note that you can also pass a Node Buffer as source as it is a sub-class of Uint8Array. Type: warning: string RollupWarning, position?

Using this method will queue warnings for a build. These warnings will be printed by the CLI just like internally generated warnings except with the plugin name , or captured by custom onwarn handlers. The warning argument can be a string or an object with at minimum a message property:. Use the second form if you need to add additional properties to your warning object. The position argument is a character index where the warning was raised.

You can defer setting the source if you provide it later via this. Emitted assets will follow the output. You can reference the URL of the file in any code returned by a load or transform plugin hook via import.

Once the asset has been finalized during generate , you can also use this. This will not result in duplicate modules in the graph, instead if necessary, existing chunks will be split. It returns a referenceId that can be used to later access the generated file name of the chunk. Emitted chunks will follow the output. If a name is provided, this will be used for the [name] file name placeholder, otherwise the name will be derived from the file name.

If a name is provided, this name must not conflict with any other entry point names unless the entry points reference the same entry module. You can reference the URL of the emitted chunk in any code returned by a load or transform plugin hook via import.

Once the chunk has been rendered during generate , you can also use this. When isResolved is false, Rollup will try to resolve the id before testing if it is external. Returns null if an id cannot be resolved. This will generate code that depends on the output format and generates a URL that points to the emitted file in the target environment. The following example will detect imports of.

Similar to assets, emitted chunks can be referenced from within JS code via import. The following example will detect imports prefixed with register-paint-worklet: and generate the necessary code and separate chunk to generate a CSS paint worklet. Note that this will only work in modern browsers and will only work if the output format is set to es.

If you build this code, both the main chunk and the worklet will share the code from config. This enables us to make use of the browser cache to reduce transmitted data and speed up loading the worklet. Transformer plugins i. If options. The transform hook, if returning an object, can also include an ast property. Only use this feature if you know what you're doing. Note that only the last AST in a chain of transforms will be used and if there are transforms, any ASTs generated by the load hook will be discarded for the transformed modules.

If a plugin transforms source code, it should generate a sourcemap automatically, unless there's a specific sourceMap: false option. Rollup only cares about the mappings property everything else is handled automatically. If it doesn't make sense to generate a sourcemap, e. If the transformation does not move code, you can preserve existing sourcemaps by returning null :.

If you create a plugin that you think would be useful to others, please publish it to NPM and add submit it to github. It is possible to designate a fallback export for missing exports by setting the syntheticNamedExports option for a module in the resolveId , load or transform hook.

If a string value is used for syntheticNamedExports , this module will fallback the resolution of any missing named exports to properties of the named export of the given name:. When used as an entry point, only explicit exports will be exposed. The synthetic fallback export, i. However if the value is true , the default export will be exposed. This is the only notable difference between syntheticNamedExports: true and syntheticNamedExports: 'default'.

At some point when using many dedicated plugins, there may be the need for unrelated plugins to be able to exchange information during the build. There are several mechanisms through which Rollup makes this possible.

Assume you have a plugin that should resolve an import to different ids depending on how the import was generated by another plugin. One way to achieve this would be to rewrite the import to use special proxy ids, e. The problem here, however, is that this proxy id may or may not cause unintended side effects when passed to other resolvers because it does not really correspond to a file. Moreover, if the id is created by plugin A and the resolution happens in plugin B , it creates a dependency between these plugins so that A is not usable without B.

Custom resolver option offer a solution here by allowing to pass additional options for plugins when manually resolving a module via this resolve. This happens without changing the id and thus without impairing the ability for other plugins to resolve the module correctly if the intended target plugin is not present.

Note the convention that custom options should be added using a property corresponding to the plugin name of the resolving plugin. It is responsibility of the resolving plugin to specify which options it respects. Plugins can annotate modules with custom meta-data which can be set by themselves and other plugins via the resolveId , load , and transform hooks and accessed via this.

This meta-data should always be JSON. Note the convention that plugins that add or modify data should use a property corresponding to the plugin name, in this case annotating. On the other hand, any plugin can read all meta-data from other plugins via this. If several plugins add meta-data or meta-data is added in different hooks, then these meta objects will be merged shallowly.

Here the result of the resolveId hook will be overwritten by the result of the load hook as the plugin was both storing them under its first top-level property. The transform data of the other plugin on the other hand will be placed next to it. The meta object of a module is created as soon as Rollup starts loading a module and is updated for each lifecycle hook of the module. If you store a reference to this object, you can also update it manually.

To access the meta object of a module that has not been loaded yet, you can trigger its creation and loading the module via this. For any other kind of inter-plugin communication, we recommend the pattern below.

Note that api will never conflict with any upcoming plugin hooks. ES modules are an official standard and the clear path forward for JavaScript code structure, whereas CommonJS modules are an idiosyncratic legacy format that served as a stopgap solution before ES modules had been proposed.

ES modules allow static analysis that helps with optimizations like tree-shaking and scope-hoisting, and provide advanced features like circular references and live bindings. Tree-shaking, also known as "live code inclusion", is Rollup's process of eliminating code that is not actually used in a given project. It is a form of dead code elimination but can be much more efficient than other approaches with regard to output size.

The name is derived from the abstract syntax tree of the modules not the module graph. The algorithm first marks all relevant statements and then "shakes the syntax tree" to remove all dead code. It is similar in idea to the mark-and-sweep garbage collection algorithm. Even though this algorithm is not restricted to ES modules, they make it much more efficient as they allow Rollup to treat all modules together as a big abstract syntax tree with shared bindings.

Rollup strives to implement the specification for ES modules, not necessarily the behaviors of Node. Consequently, loading of CommonJS modules and use of Node's module location resolution logic are both implemented as optional plugins, not included by default in the Rollup core. Just npm install the commonjs and node-resolve plugins and then enable them using a rollup. If the modules import JSON files, you will also need the json plugin. Philosophically, it's because Rollup is essentially a polyfill of sorts for native module loaders in both Node and browsers.

In a browser, import foo from 'foo' won't work, because browsers don't use Node's resolution algorithm. On a practical level, it's just much easier to develop software if these concerns are neatly separated with a good API. Rollup's core is quite large, and everything that stops it getting larger is a good thing. Meanwhile, it's easier to fix bugs and add features. By keeping Rollup lean, the potential for technical debt is small.

Please see this issue for a more verbose explanation. By default when creating multiple chunks, imports of dependencies of entry chunks will be added as empty imports to the entry chunks themselves.

Example :. This does not affect code execution order or behaviour, but it will speed up how your code is loaded and parsed. Without this optimization, a JavaScript engine needs to perform the following steps to run main. With this optimization, a JavaScript engine will discover all transitive dependencies after parsing an entry module, avoiding the waterfall:. There may be situations where this optimization is not desired, in which case you can turn it off via the output.

This optimization is also never applied when using the output. Even though Rollup will usually try to maintain exact module execution order when bundling, there are two situations when this is not always the case: code-splitting and external dependencies.

The problem is most obvious with external dependencies, see the following example :. Here the execution order is polyfill. Now when you bundle the code, you will get. This is not a problem caused by Rollup putting the import at the top of the bundle—imports are always executed first, no matter where they are located in the file. This problem can be solved by creating more chunks: If dep. However there is not yet an automatic way to do this in Rollup.

For code-splitting, the situation is similar as Rollup is trying to create as few chunks as possible while making sure no code is executed that is not needed.

If module A imports module B and there are no circular imports, then B will always be executed before A. This is however a problem for polyfills, as those usually need to be executed first but it is usually not desired to place an import of the polyfill in every single module.

Luckily, this is not needed:. Rollup is already used by many major JavaScript libraries, and can also be used to build the vast majority of applications. However if you want to use code-splitting or dynamic imports with older browsers, you will need an additional runtime to handle loading missing chunks.

We recommend using the SystemJS Production Build as it integrates nicely with Rollup's system format output and is capable of properly handling all the ES module live bindings and re-export edge cases.

Alternatively, an AMD loader can be used as well. Unlike other bundlers such as Webpack and Browserify, Rollup doesn't know "out of the box" how to handle these dependencies - we need to add some configuration. Let's add a simple dependency called the-answer , which exports the answer to the question of life, the universe and everything:. The resulting bundle. For that, we need a plugin.

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