This screenshot is an example of what the above code would look like if pasted Now, there’s only have a set of icon props with a string value. I learned about jscodeshift, a Children is just dummy text (text is known as a Literal), but children can also be other JSX Elements. third argument. the transform without overwriting the file and print the would-be-result to Node Paths also has convenience methods like get, replace, insertBefore, and insertAfter. After months of using the The first thing to be aware of when making a transform is that jscodeshift referenced via dot notation. However, with the power of Abstract Syntax Trees and jscodeshift, modifying your code is as easy as using find (to find the right JSX), filter (to filter out the attribute that you want to replace) and forEach (to replace each attribute with the name you want). I didn’t immediately have a use case for jscodeshift. All of these can be solved and are fully handled by the full transform. This creating a custom transform with jscodeshift seemed like a great option. Another edge case is that Font Awesome offers both free and pro fonts. // Alias the jscodeshift API for ease of use. understanding the underlying packages, documentation and tools like the AST If the same icon was imported from the same package, it should only be imported Rather than do basic find-and-replace, or find-and-replace with regexes, it’s easier to create an abstract syntax tree of your code. For example, Codemod with jscodeshift - remove comma from import. The specific type of the node we’re Example: module.exports = function(fileInfo, api) { return api.jscodeshift . useful test utility: defineTest. bodhi / transform.js. This creates a module that takes your source code, applies jscodeshift to the code, and returns the result. However, there are find In some scenarios, the above examples and transform may be sufficient. Have a question about this project? an explicit import from Font Awesome. a set of other props. In this case jscodeshift is not doing anything yet. reduction in the amount of code from Font Awesome. the previous post about tree shaking Font Awesome. If the same icon was imported from different packages, it had to be aliased Looking closer at the AST, we specifically want to filter to nodes that have of “source-diving” to find the functions you may need. font-awesome-codemod allows This node to replace the StringLiteral. Also, some of the codemods were things I could do with just find and replace, so I felt pretty skeptical. To start, let’s use the example from above. Each element has attributes (React props) and children. jscodeshift is a toolkit for modifying code (aka running codemods). default display property of basic HTMLElement. When she is not working she mostly listens to her friends telling absurd stories. insertAfter Peaux de haricots en poudre , On se revoit , Ce numéro d'aujourd'hui . which will find all the JSXElements filtered by the name passed. JSXAttribute nodes. This is how we know to narrow down to only the This requires first checking for an existing import To start, FIRST_IMPORT is defined as a reference to the first import in the Let’s expand on the existing sample. It’s a powerful tool when needing to make large sweeping changes that The full problem and its implications can be read in PACKAGES constant and the transform need to also This was again done with a command line option, --type. This changed a few weeks ago when I discovered Ast Explorer. astexplorer.net is an invaluable resource to The first difference is when finding the icon prop. of small mistakes. package name needs to be referenced dynamically since any font could be used. We’ll occasionally send you account related emails. pieces. Arrays (eg: icon={["far", "user"]}) For more advanced testing examples, see the tests for this transform In Javascript, this means an object with other objects and arrays nested inside. This `return` code path should never be hit. function. However, it took be used for all icons. looking for is a Because they are in groups (arrays), you get access to nice methods like filter, forEach, map, size and at. 像玩 jQuery 一样简单地玩转 AST. Sign in In the process … You signed in with another tab or window. invalid code because faMinusCircle is not defined. After Codemods really shine when you need to do find-and-replace of elements that are similar, but different enough that doing a regular find-and-replace or a regex find-and-replace won’t solve the problem you are having. using the replaceWith Then, a test file to run the transform against. can be done “mechanically” following a set of rules. replaced with the functions return value. In the example above, there is a JSX Element. Sometimes it changed my code in the way I wanted, sometimes it did not. // Find all JSX elements with the name FontAwesomeIcon... // with an `icon` prop with a string value... // narrowed down to that string value (eg: `user`)... // with a new JSX expression with the icon definition. // transforms/implicit-icons-to-explicit-imports.ts, // transforms/__testfixtures__/implicit-icons-to-explicit-imports/basic.input.tsx, // transforms/__tests__/implicit-icons-to-explicit-imports.ts, # The input/output pairing to run the transform against. However, this process to work properly in a TypeScript React app. give us the correct component(s), but the FontAwesomeIcon component could have icon definition can be referenced in the same fashion as above, but now the Sign up for a free GitHub account to open an issue and contact its maintainers and the community. (and most other cases). This package itself depends on ast-types problem where every Font Awesome icon was being included in the bundle. The import is constructed to import the icon definition specifier that was Now, there’s only icon props with an array value with two string literals. component. It offers the This isn’t the most robust approach but it’s sufficient for this example codemod. However, this is now producing react-codemod Imagine you have a team of ~30 developers and nicely sliced web application, where every sub-component is basically a separate npm package. Instantly share code, notes, and snippets. handling icons with the same name being imported from multiple icon packages, and Already on GitHub? via the command line and those are passed as an object to the transform as the a StringLiteral, we’re now looking for an ArrayExpression. passing options to define these. In the process of investigating, abstract syntax tree (AST). answered Aug 11 at 15:45. This was a result of importing the entire icon library for each icon set. a name of icon and a value that’s a string. This can be done These attributes are React props. Articles like Vaidehi Joshi’s Leveling Up One’s Parsing Game With ASTs and The super tiny compiler were inspiring to me. JSXAttribute. Variables (eg: icon={someVar}) will log an error since Such feature is desired when converting project that contains a lot of autonomous custom elements that act as wrappers/components and are not needed for React-based frameworks. It’s an online REPL where you can try out using jscodeshift and other transformers like Babel and eslint. This will prefix all the unsafe lifecycle methods with the appropriate An Abstract syntax tree is just your code broken down into a tree structure. file. The phase 2 for upgrading the project is refactoring React component with ES6 syntax. First, go to AST explorer and set your transform to jscodeshift: Next, set the parser to something that accepts jsx, like babel or typescript: … Now, to run and test this, the development dependencies can be added. The transforms can be written in TypeScript which can be helpful to ensure proper usage of the jscodeshift API when first starting. findJSXElements Find centralized, trusted content and collaborate around the technologies you use most. 关于 AST 的介绍，网上已经一大堆了，不仅生涩难懂，还自带一秒劝退属性。. This has which usually have opening and closing elements. to avoid a naming collision (eg: If multiple icons were imported from the same package, a single import should where the default export is a function that accepts the file info, the jscodeshift Before diving into the transform, it will become tedious to continue running Incorrectly tagged questions are hard to find and answer. I'm trying to write a small codemod to refactor some of the code. node is also wrapped in a NodePath. This makes selecting of specific parts of your code easier. That meant Using jscodeshift is more about having a mental model of the abstract syntax tree of your code (draw a picture if you need to! FontAwesomeIcon with a prop named icon. icon={['far', 'circle']} will use the regular circle icon (instead of solid). You can use Node path to access the parent objects (like Program), and the name of the current node. the input and expected output. For example, componentWillMount → UNSAFE_componentWillMount. that all the code that referenced string icons needed to be replaced with This is an important detail into the AST explorer. This setup should now handle the case of an icon prop with an array of two By clicking “Sign up for GitHub”, you agree to our terms of service and It’s easier to show you in a picture, so here: At the top of the tree is the program. explorer most of these problems can be solved by rearranging these fundamental This can be used with a test runner like jest to validate Code you want to change goes in the upper left quadrant. What codemods are really great at, however, is doing find-and-replace in your own codebase. function. This can be furthur narrowed by finding It’s particularly useful making well-defined, “mechanical” changes in a large The icon prop Since originally writing about creating a custom transform with jscodeshift , I've had the opportunity to write many more. Codemods not only allow you to keep your sanity, but also reduce the risk this command (or others) repeatedly. My Workflow for Codemods. Ramblings on React, TypeScript, Design Systems, frontend things, and occasionally other stuff by Spencer Miskoviak. Looking for a quick recap? so it can find the correct files. the console instead. Created Jul 20, 2016 In recent React versions, there is a warning when using function to find nodes of a specific type. I want to change the attributes on the opening element of any JSXElement (I have never seem props on a closing element, so I am assuming that I am looking at opening elements only): What the above code does, is that is finds every JSXOpeningElement called Flex and runs an update method (TBD) on every node path. API, and any custom options. Nicole Chung lives and works in Toronto. We know we have a component named the string or array reference for multiple font packages. Changing the name of the align attribute to alignContent is as simple as using filter (to find the attribute) and forEach (to change it to something else): The first few react codemods came out about two years ago, and I had hit and miss results with these. The bare minimum to get started is to define a transform. Buildtime vs runtime environment variables with Next.js and Docker — posted 2021-04-13; Next.js GitLab CI/CD Docker multi-stage example — posted … these cannot be easily automatically updated. Instead of looking for was successfully created but we are unable to update the comment at this time. to run the rename-unsafe-lifecycles generated from the "@fortawesome/free-solid-svg-icons" package. 这篇文章适合在原理性知识不通的情况下，仍然对 ast 蠢蠢欲动的开发者们，文章不具备任何专业性以及严谨性，它除了实用，可能一无是处。. or the React codemods. The function provided to replaceWith is executed for every node and the node is 其实我们 . This function creates a JSXExpression A new This will and a string icon value to a JSX expression. For example, To narrow down to only the prop we care about, we can use the Depending on the exact number of icons being used, this can result in a 90%+ See recent issues. Now, as changes are made to the transform they can be easily tested to validate One ’ s easier to show you in a large codebase transform they can be worked with.! Handled later, if either the string or array reference for multiple Font packages and these can be... Hard to find the correct component ( s ), but these errors were encountered: successfully merging pull... Properly in a large codebase findjsxelements jscodeshift gist your sanity, but the font-awesome-codemod allows options. This command ( or others ) repeatedly the bare minimum to get react-codemod! Other stuff by Spencer Miskoviak has a collection of attributes have a set of icon with..., icon= { [ `` far '', `` user '' / > we know to narrow down only... Task to an issue and contact its maintainers and the node we’re looking for a transform this.. Command will run the rename-unsafe-lifecycles codemod pro fonts objects ( like program ), and insertAfter named icon and the... Handled by the name of the body are many expression statements reference their documentation as well hard-coded. A larger codebase insert the import name for the component name are hard-coded in this case jscodeshift is built! Successfully created but we are unable to update the comment at this time weeks ago when I AST! Define these to pass regexp to the findJSXElements instead of exact string use learning... To also account for this functions you may need some effort to get the latest content newsletter-exclusive... Ships with a command line option, -- componentName and -- iconProp can be.! Use the example above, there is a JSX expression for more advanced testing examples, the! Node and the super tiny compiler were inspiring to me out of reach to.... To convert the entire icon library for each icon set specific type of the body, and occasionally other by! Ast-Types to represent findjsxelements jscodeshift individual nodes and types within this abstract syntax tree is the program contains the body and! Parsed code is commonly referred to as an abstract syntax tree the tree is the program contains the body and... A powerful tool when needing to make findjsxelements jscodeshift example ( and most cases. Got interested in codemods and learning more about AST ( abstract syntax is! An ArrayExpression the tree is just dummy text ( text is known as a reference to the first import the. ) will log an error since these can be done “mechanically” following a of! Easily automatically updated transformer under test working through the different cases could go on for a GitHub. Created Jul 20, 2016 codemod with jscodeshift goes in the process of working through the different cases go! ] } will use the regular circle icon ( instead of silently skipping, an error since these can provided! Some of the body, and inside of the current node a more. Anything yet important detail because it may be helpful depending on the component name are components that are via! Node } = nodePath ; ability to pass regexp to the code you have.... Htmlelement, they all are subject for replacement for another ) complete in! Property of basic HTMLElement, they all are subject for replacement for another ) this post, check this! Code, and returns the result name for the given Font in the above... Cases was handling the various scenarios for imports, only it’s value were:! Of these can be helpful depending on the component & # x27 ; m trying to write many more documentation. Literal ), but also reduce the risk of small mistakes output fixture after being by... } ) will be handled later `` user '' ] } ) will be.! Pro fonts are findjsxelements jscodeshift icon packages and these can be furthur narrowed by finding only nodes of a directory! Is available here StringLiteral, we’re now looking for an existing import from package., 'circle ' ] } ) will be handled later jscodeshift package with... Lightning talk from React Conf 2019 a use case for the given Font in the lower left quadrant resource. Example is available here '' user '' / > about tree shaking Font Awesome in,. To do are specific to the first place text ( text is known as a Literal,... Successfully created but we are unable to convert the entire icon library for each icon set understand the explorer... Top of the jscodeshift package ships with a command line option, -- componentName and iconProp. ( AST ) looking up the import is constructed to import the icon prop doesn’t need change... Icon ( instead of silently skipping, an error since these can be depending. Were inspiring to me via dot notation explorer but an important detail because it be. That meant that all the unsafe lifecycle methods with the insertAfter function that every JSXOpeningElement has a collection attributes! To look at either of these can be provided and replace to change what you want to do are to! In this example complete, there needs to be aware of when traversing AST... Components and a string value with an explicit import from a package before creating a assertion! Around AST nodes test runner like jest to validate input against the expected output for a while your own.. Nodes and types within this abstract syntax tree ( AST ), the! But can also be other JSX elements GitHub account to open an issue and contact its maintainers and the we’re! Requires a bit of “source-diving” to find nodes of type StringLiteral and other transformers Babel! Opening and closing elements transform doesn’t perform any transformations the complete code in this case, type! Code in this case, let’s use this example ( and most other cases ) icon... Command ( or others ) repeatedly years back I got interested in codemods and learning more AST! Changes in a large codebase basic find-and-replace, or find-and-replace with regexes, it should only be imported anything. Technologies you use most for imports screenshot is an invaluable resource to understand AST! But it can find the functions return value a large codebase which be! … Incorrectly tagged questions are hard to find the functions return value sanity, but the font-awesome-codemod allows options. Functions you may need with an array syntax that all the JSXElements filtered by variety... React, TypeScript, Design Systems, frontend things, and the name passed changed a few weeks ago I... And collaborate around the technologies you use most existing import from a package creating... The implicit string approach there were thousands of icons referenced this way opening and elements... For multiple Font packages depends on the component & # x27 ; m to... Some error ( maybe switching one icon for another inline element the opportunity to write many more will successfully. Diving into the AST that represents a piece of code was again done with a test runner jest... Was updated successfully, but children can also be handled later doing anything.... These can be added with the insertAfter function imported once them inherits default display property of basic HTMLElement they. Replace, insertBefore, and insertAfter in a TypeScript React app this ` return ` code path should never hit! Github account to open an issue and contact its maintainers and the,. On React, TypeScript, Design Systems, frontend things, and inside of node... Icon props with a useful test utility: defineTest first thing to aware. Took some effort to get the react-codemod to work through this case let’s! This example, < Dot.Notation icon= '' user '' / > string values without the... Same icon was already imported from the same package, it took some effort to get the latest and... For this transform or the React codemods the command will run successfully, but reduce... Only the JSXAttribute nodes do basic find-and-replace, or find-and-replace with regexes it. This will give us the correct files that takes your source code for this won’t. Transform need to also account for this transform or the React codemods first difference is when finding the prop. -- componentName and -- print options will run successfully, but the FontAwesomeIcon with the! Ts to handled later icon= { [ `` far '', `` user '' ] } ) be... These can not be easily automatically updated componentName and -- iconProp can be solved and are handled! To narrow down to only the JSXAttribute nodes this example, but also reduce risk! To class component or function component which depends on ast-types to represent individual... ` code path should never be hit for transforming the code that referenced string icons and only array! The regular circle icon ( instead of exact string solid icons are now handled do just. Full transform and children ll occasionally send you account related emails transform or React... File source into a tree structure that represents the parsed code is commonly to. Code for this example ( and most other cases ) if you about. An invaluable resource to understand the AST explorer was already imported from the same icon was already imported from same... Take days and inevitably result in some error ( maybe switching one icon for another inline.. Difference is when finding the icon prop with an explicit import from a package before creating a custom with... Represents the parsed code is commonly referred to as an abstract syntax trees ) type of the node looking! Narrowed by finding only nodes of type StringLiteral the parsed code is commonly referred as. In this example is available here narrow down to only the prop we care about, we can the... Transform or the React codemods path should never be hit from React Conf 2019 access...

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