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On the bottom level of 🐊`Putout` layes down `Syntax Tree`. This is data structure that makes possible to do [crazy transformations in a simplest possible way](https://dev.to/viveknayyar/revealing-the-magic-of-ast-by-writing-babel-plugins-1h01). It used mostly in compilers development.
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On the bottom level of 🐊**Putout** layes down `Syntax Tree`. This is data structure that makes possible to do [crazy transformations in a simplest possible way](https://dev.to/viveknayyar/revealing-the-magic-of-ast-by-writing-babel-plugins-1h01). It used mostly in compilers development.
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You can read about it in [Babel Plugin Handbook](https://github.com/jamiebuilds/babel-handbook/blob/master/translations/en/plugin-handbook.md). To understand how things works from the inside take a look at [Super Tiny Compiler](https://github.com/jamiebuilds/the-super-tiny-compiler).
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@@ -362,7 +362,7 @@ It looks this way in [ESTree](https://github.com/estree/estree) JavaScript synta
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>
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> **(c) Yamamoto Tsunetomo "Hagakure"**
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🐊`Putout` based on [Babel AST](https://github.com/babel/babel/blob/main/packages/babel-parser/ast/spec.md). It has a couple differences from `ESTree` which are perfectly handled by [estree-to-babel](https://github.com/coderaiser/estree-to-babel) especially when 🐊`Putout` running as [a plugin for `ESLint`](#integration-with-eslint).
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🐊**Putout** based on [Babel AST](https://github.com/babel/babel/blob/main/packages/babel-parser/ast/spec.md). It has a couple differences from `ESTree` which are perfectly handled by [estree-to-babel](https://github.com/coderaiser/estree-to-babel) especially when 🐊**Putout** running as [a plugin for `ESLint`](#integration-with-eslint).
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### 🌴 Laws of the Jungle
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### Processors
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With help of [processors](https://github.com/coderaiser/putout/blob/master/packages/engine-processor) 🐊`Putout` can be extended to read any file format and parse `JavaScript` from there.
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With help of [processors](https://github.com/coderaiser/putout/blob/master/packages/engine-processor) 🐊**Putout** can be extended to read any file format and parse `JavaScript` from there.
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Here is a list of built-int processors:
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#### No fix
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From the beginning, 🐊`Putout` developed with ability to split the main process into two concepts: `find` (find places that could be fixed) and `fix` (apply the fixes to the files).
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From the beginning, 🐊**Putout** developed with ability to split the main process into two concepts: `find` (find places that could be fixed) and `fix` (apply the fixes to the files).
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It is therefore easy to find sections that could be fixed.
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In the following example reduntand variables are found without making changes to the source file:
To configure 🐊`Putout` add section `putout` to your `package.json` file or create `.putout.json` file and override any of [default options](/packages/putout/putout.json).
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To configure 🐊**Putout** add section `putout` to your `package.json` file or create `.putout.json` file and override any of [default options](/packages/putout/putout.json).
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### Rules
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### Plugins
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There are two types of plugin names supported by 🐊`Putout`, their names in npm start with a prefix:
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There are two types of plugin names supported by 🐊**Putout**, their names in npm start with a prefix:
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-`@putout/plugin-` for official plugins
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-`putout-plugin-` for user plugins
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> **(c) Yamamoto Tsunetomo "Hagakure"**
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🐊`Putout` plugins are the simplest possible way to transform `AST` and this is for a reason.
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🐊**Putout** plugins are the simplest possible way to transform `AST` and this is for a reason.
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And the reason is `JavaScript`-compatible language 🦎[`PutoutScript`](https://github.com/coderaiser/putout/blob/master/docs/putout-script.md#-putoutscript) which adds additional meaning to identifiers used in `AST`-template.
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Let's dive into plugin types that you can use for you next code transformation.
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### Replacer
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The simplest 🐊`Putout` plugin type, consits of 2 functions:
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The simplest 🐊**Putout** plugin type, consits of 2 functions:
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-`report` - report error message to `putout` cli;
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-`replace` - replace `key` template into `value` template;
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### 🤷♂️ What if I don't want to publish a plugin?
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If you don't want to publish a `plugin` you developed, you can pass it to 🐊`Putout` as an `object` described earler. Here is [how it can look like](https://github.com/coderaiser/mock-import/blob/v1.0.8/lib/convert-imports/index.js#L19-L33):
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If you don't want to publish a `plugin` you developed, you can pass it to 🐊**Putout** as an `object` described earler. Here is [how it can look like](https://github.com/coderaiser/mock-import/blob/v1.0.8/lib/convert-imports/index.js#L19-L33):
Using 🐊`Putout` as a runner for `babel``plugins` you can not only change file content, but also see what exactly will be changed. You can use your already written `babel``plugins` or reuse work in progress plugins made for `babel`,
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Using 🐊**Putout** as a runner for `babel``plugins` you can not only change file content, but also see what exactly will be changed. You can use your already written `babel``plugins` or reuse work in progress plugins made for `babel`,
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☝️ *Remember 🐊`Putout``plugins` gave more accurate information about changing places, and works faster (no need to find information about changes in transformed file).*
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☝️ *Remember 🐊**Putout**`plugins` gave more accurate information about changing places, and works faster (no need to find information about changes in transformed file).*
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### Babel plugins list
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This way you can keep rules specific for your project and run them on each lint.
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☝️ *Remember: if you want to exclude file from loading, add prefix `not-rule-` and 🐊`Putout` will ignore it (in the same way as he does for `node_modules`).*
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☝️ *Remember: if you want to exclude file from loading, add prefix `not-rule-` and 🐊**Putout** will ignore it (in the same way as he does for `node_modules`).*
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## 🦕 Integration with ESLint
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If you see that 🐊`Putout` brokes formatting of your code, use eslint plugin [eslint-plugin-putout](https://github.com/coderaiser/putout/tree/master/packages/eslint-plugin-putout#eslint-plugin-putout--).
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If you see that 🐊**Putout** brokes formatting of your code, use eslint plugin [eslint-plugin-putout](https://github.com/coderaiser/putout/tree/master/packages/eslint-plugin-putout#eslint-plugin-putout--).
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Install `eslint-plugin-putout` with:
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}
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```
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And use with 🐊`Putout` this way:
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And use with 🐊**Putout** this way:
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```sh
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putout --fix lib
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eslint --fix lib
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```
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Applies 🐊`Putout` transformations for you :).
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Applies 🐊**Putout** transformations for you :).
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### `ESLint` API
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`ESLint` begins his work as a formatter when 🐊`Putout` done his transformations. That's why it used a lot in different parts of application, for testing purpose and using `API` in a simplest possible way. You can access it with:
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`ESLint` begins his work as a formatter when 🐊**Putout** done his transformations. That's why it used a lot in different parts of application, for testing purpose and using `API` in a simplest possible way. You can access it with:
It is disabled by default, because `ESLint` always runs after 🐊`Putout` transformations, so there is no need to traverse tree again.
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It is disabled by default, because `ESLint` always runs after 🐊**Putout** transformations, so there is no need to traverse tree again.
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This `API` doesn't suppose to came in 🌴 Public Space, anyways it is already used in [`eslint-plugin-putout`](https://github.com/coderaiser/putout/tree/master/packages/eslint-plugin-putout) to [test plugins](https://github.com/coderaiser/putout/blob/master/packages/eslint-plugin-putout/test/test-lint.mjs#L24-L28), so why not :)? Anyways it's signature didn't changed from the beginning.
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## ☄️ Integration with Babel
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🐊 `Putout` can be used as [babel plugin](/packages/babel-plugin-putout).
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🐊 **Putout** can be used as [babel plugin](/packages/babel-plugin-putout).
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Just create `.babelrc.json` file with configuration you need.
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```json
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## 🚪Exit Codes
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🐊`Putout` can have one of next [exit codes](https://github.com/coderaiser/putout/blob/master/packages/putout/lib/cli/exit-codes.mjs):
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🐊**Putout** can have one of next [exit codes](https://github.com/coderaiser/putout/blob/master/packages/putout/lib/cli/exit-codes.mjs):
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| Code | Name | Description | Example|
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|------|------|-----------------|-------------|
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## 📻 Versioning Policy
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`Putout` follows semantic versioning ([semver](https://semver.org)) principles, with version numbers being on the format **major**.**minor**.**patch**:
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**Putout** follows semantic versioning ([semver](https://semver.org)) principles, with version numbers being on the format **major**.**minor**.**patch**:
🐊[`Putout`](https://github.com/coderaiser/putout) plugin adds ability to apply `filter(Boolean)`. Better use [@putout/plugin-remove-useless-functions](https://github.com/coderaiser/putout/tree/v21.6.0/packages/plugin-remove-useless-functions).
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🐊[**Putout**](https://github.com/coderaiser/putout) plugin adds ability to apply `filter(Boolean)`. Better use [@putout/plugin-remove-useless-functions](https://github.com/coderaiser/putout/tree/v21.6.0/packages/plugin-remove-useless-functions).
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