458 lines
24 KiB
Markdown
458 lines
24 KiB
Markdown
<div align="center">
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<h1>babel-plugin-macros 🎣</h1>
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<p>Allows you to build simple compile-time libraries</p>
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</div>
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---
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<!-- prettier-ignore-start -->
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[![Build Status][build-badge]][build]
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[![Code Coverage][coverage-badge]][coverage]
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[![version][version-badge]][package]
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[![downloads][downloads-badge]][npmtrends]
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[![MIT License][license-badge]][license]
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[![All Contributors][all-contributors-badge]](#contributors-)
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[![PRs Welcome][prs-badge]][prs]
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[![Code of Conduct][coc-badge]][coc]
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<!-- prettier-ignore-end -->
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## The problem
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Check out
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[this guest post](https://babeljs.io/blog/2017/09/11/zero-config-with-babel-macros)
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on the Babel.js blog for a complete write up on the problem, motivation, and
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solution.
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Currently, each babel plugin in the babel ecosystem requires that you configure
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it individually. This is fine for things like language features, but can be
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frustrating overhead for libraries that allow for compile-time code
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transformation as an optimization.
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## This solution
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babel-plugin-macros defines a standard interface for libraries that want to use
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compile-time code transformation without requiring the user to add a babel
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plugin to their build system (other than `babel-plugin-macros`, which is ideally
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already in place).
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<details>
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<summary>Expand for more details on the motivation</summary>
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For instance, many css-in-js libraries have a css tagged template string
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function:
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```js
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const styles = css`
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.red {
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color: red;
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}
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`
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```
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The function compiles your css into (for example) an object with generated class
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names for each of the classes you defined in your css:
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```js
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console.log(styles) // { red: "1f-d34j8rn43y587t" }
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```
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This class name can be generated at runtime (in the browser), but this has some
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disadvantages:
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- There is cpu usage/time overhead; the client needs to run the code to generate
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these classes every time the page loads
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- There is code bundle size overhead; the client needs to receive a CSS parser
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in order to generate these class names, and shipping this makes the amount of
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js the client needs to parse larger.
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To help solve those issues, many css-in-js libraries write their own babel
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plugin that generates the class names at compile-time instead of runtime:
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```js
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// Before running through babel:
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const styles = css`
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.red {
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color: red;
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}
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`
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// After running through babel, with the library-specific plugin:
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const styles = {red: '1f-d34j8rn43y587t'}
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```
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If the css-in-js library supported babel-plugin-macros instead, then they
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wouldn't need their own babel plugin to compile these out; they could instead
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rely on babel-plugin-macros to do it for them. So if a user already had
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`babel-plugin-macros` installed and configured with babel, then they wouldn't
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need to change their babel configuration to get the compile-time benefits of the
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library. This would be most useful if the boilerplate they were using came with
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`babel-plugin-macros` out of the box, which is true for
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[`create-react-app`][cra].
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Although css-in-js is the most common example, there are lots of other things
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you could use `babel-plugin-macros` for, like:
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- Compiling GraphQL fragments into objects so that the client doesn't need a
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GraphQL parser
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- Eval-ing out code at compile time that will be baked into the runtime code,
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for instance to get a list of directories in the filesystem (see
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[preval][preval])
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</details>
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## Table of Contents
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<!-- START doctoc generated TOC please keep comment here to allow auto update -->
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<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
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- [Installation](#installation)
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- [Usage](#usage)
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- [User docs](#user-docs)
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- [Author docs](#author-docs)
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- [Caveats](#caveats)
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- [FAQ](#faq)
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- [How do I find available macros?](#how-do-i-find-available-macros)
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- [What's the difference between babel plugins and macros?](#whats-the-difference-between-babel-plugins-and-macros)
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- [In what order are macros executed?](#in-what-order-are-macros-executed)
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- [Does it work with function calls only?](#does-it-work-with-function-calls-only)
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- [How about implicit optimizations at compile time?](#how-about-implicit-optimizations-at-compile-time)
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- [Inspiration](#inspiration)
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- [Other Solutions](#other-solutions)
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- [Issues](#issues)
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- [🐛 Bugs](#-bugs)
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- [💡 Feature Requests](#-feature-requests)
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- [Contributors ✨](#contributors-)
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- [LICENSE](#license)
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<!-- END doctoc generated TOC please keep comment here to allow auto update -->
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## Installation
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This module is distributed via [npm][npm] which is bundled with [node][node] and
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should be installed as one of your project's `devDependencies`:
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```
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npm install --save-dev babel-plugin-macros
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```
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## Usage
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> You may like to watch
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> [this YouTube video](https://www.youtube.com/watch?v=1queadQ0048&list=PLV5CVI1eNcJgCrPH_e6d57KRUTiDZgs0u)
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> to get an idea of what macros is and how it can be used.
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### User docs
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Are you trying to use `babel-plugin-macros`? Go to
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[`other/docs/user.md`](other/docs/user.md).
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### Author docs
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Are you trying to make your own macros that works with `babel-plugin-macros`? Go
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to [`other/docs/author.md`](other/docs/author.md). (you should probably read the
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user docs too).
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### Caveats
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#### Babel cache problem
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> **Note:** This issue is not present when used in Create React App.
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Most of the time you'll probably be using this with the babel cache enabled in
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webpack to rebuild faster. If your macro function is **not pure** which gets
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different output with same code (e.g., IO side effects) it will cause recompile
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mechanism fail. Unfortunately you'll also experience this problem while
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developing your macro as well. If there's not a change to the source code that's
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being transpiled, then babel will use the cache rather than running your macro
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again.
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For now, to force recompile the code you can simply add a cache busting comment
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in the file:
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```diff
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import macro from 'non-pure.macro';
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-// Do some changes of your code or
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+// add a cache busting comment to force recompile.
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macro('parameters');
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```
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This problem is still being worked on and is not unique to
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`babel-plugin-macros`. For more details and workarounds, please check related
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issues below:
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- babel-plugin-preval:
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[How to force recompile? #19](https://github.com/kentcdodds/babel-plugin-preval/issues/19)
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- graphql.macro:
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[Recompile problem (babel cache) #6](https://github.com/evenchange4/graphql.macro/issues/6)
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- twin.macro:
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[Can't change taliwind config #37](https://github.com/ben-rogerson/twin.macro/discussions/37)
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## FAQ
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### How do I find available macros?
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You can write your own without publishing them to `npm`, but if you'd like to
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see existing macros you can add to your project, then take a look at the
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[Awesome babel macros](https://github.com/jgierer12/awesome-babel-macros)
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repository.
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Please add any you don't see listed!
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### What's the difference between babel plugins and macros?
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Let's use
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[`babel-plugin-console`](https://www.npmjs.com/package/babel-plugin-console) as
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an example.
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If we used `babel-plugin-console`, it would look like this:
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1. Add `babel-plugin-console` to `.babelrc`
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2. Use it in a code:
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```js
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function add100(a) {
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const oneHundred = 100
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console.scope('Add 100 to another number')
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return add(a, oneHundred)
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}
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function add(a, b) {
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return a + b
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}
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```
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When that code is run, the `scope` function does some pretty nifty things:
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**Browser:**
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![Browser console scoping add100](https://github.com/mattphillips/babel-plugin-console/raw/53536cba919d5be49d4f66d957769c07ca7a4207/assets/add100-chrome.gif)
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**Node:**
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<img alt="Node console scoping add100" src="https://github.com/mattphillips/babel-plugin-console/raw/53536cba919d5be49d4f66d957769c07ca7a4207/assets/add100-node.png" width="372" />
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Instead, let's use the macro it's shipped with like this:
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1. Add `babel-plugin-macros` to `.babelrc` (only once for all macros)
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2. Use it in a code:
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```js
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import scope from 'babel-plugin-console/scope.macro'
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function add100(a) {
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const oneHundred = 100
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scope('Add 100 to another number')
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return add(a, oneHundred)
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}
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function add(a, b) {
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return a + b
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}
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```
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The result is exactly the same, but this approach has a few advantages:
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**Advantages:**
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- requires only one entry in `.babelrc` for all macros used in project. Add that
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once and you can use all the macros you want
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- toolkits (like [create-react-app][cra]) may already support
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`babel-plugin-macros`, so no configuration is needed at all
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- it's explicit. With `console.scope` people may be fooled that it's just a
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normal `console` API when there's really a babel transpilation going on. When
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you import `scope`, it's obvious that it's macro and does something with the
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code at compile time. Some ESLint rules may also have issues with plugins that
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look for "global" variables
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- macros are safer and easier to write, because they receive exactly the AST
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node to process
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- If you misconfigure `babel-plugin-console` you wont find out until you run the
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code. If you misconfigure `babel-plugin-macros` you'll get a compile-time
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error.
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**Drawbacks:**
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- Cannot (should not) be used for implicit transpilations (like syntax plugins)
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- Explicitness is more verbose. Which some people might consider a drawback...
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### In what order are macros executed?
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This is another advantage of `babel-plugin-macros` over regular plugins. The
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user of the macro is in control of the ordering! The order of execution is the
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same order as imported. The order of execution is clear, explicit and in full
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control of the user:
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```js
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import preval from 'preval.macro'
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import idx from 'idx.macro'
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// preval macro is evaluated first, then idx
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```
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This differs from the current situation with babel plugins where it's
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prohibitively difficult to control the order plugins run in a particular file.
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### Does it work with function calls only?
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No! Any AST node type is supported.
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It can be tagged template literal:
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```js
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import eval from 'eval.macro'
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const val = eval`7 * 6`
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```
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A function:
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```js
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import eval from 'eval.macro'
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const val = eval('7 * 6')
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```
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JSX Element:
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```js
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import Eval from 'eval.macro'
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const val = <Eval>7 * 6</Eval>
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```
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Really, anything...
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See the [testing snapshot](src/__tests__/__snapshots__/index.js.snap) for more
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examples.
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### How about implicit optimizations at compile time?
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All examples above were _explicit_ - a macro was imported and then evaluated
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with a specific AST node.
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Completely different story are _implicit_ babel plugins, like
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[transform-react-constant-elements](https://babeljs.io/docs/plugins/transform-react-constant-elements/),
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which process whole AST tree.
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Explicit is often a better pattern than implicit because it requires others to
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understand how things are globally configured. This is in this spirit are
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`babel-plugin-macros` designed. However, some things _do_ need to be implicit,
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and those kinds of babel plugins can't be turned into macros.
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## Inspiration
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- [threepointone/babel-plugin-macros](https://github.com/threepointone/babel-plugin-macros)
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- [facebookincubator/create-react-app#2730][cra-issue]
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Thank you to [@phpnode](https://github.com/phpnode) for donating the npm package
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`babel-plugin-macros`.
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## Other Solutions
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- [sweetjs](http://sweetjs.org/)
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## Issues
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_Looking to contribute? Look for the [Good First Issue][good-first-issue]
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label._
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### 🐛 Bugs
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Please file an issue for bugs, missing documentation, or unexpected behavior.
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[**See Bugs**][bugs]
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### 💡 Feature Requests
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Please file an issue to suggest new features. Vote on feature requests by adding
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a 👍. This helps maintainers prioritize what to work on.
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[**See Feature Requests**][requests]
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## Contributors ✨
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Thanks goes to these people ([emoji key][emojis]):
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<!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
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<!-- prettier-ignore-start -->
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<!-- markdownlint-disable -->
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<table>
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<tr>
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<td align="center"><a href="https://kentcdodds.com"><img src="https://avatars.githubusercontent.com/u/1500684?v=3?s=100" width="100px;" alt=""/><br /><sub><b>Kent C. Dodds</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=kentcdodds" title="Code">💻</a> <a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=kentcdodds" title="Documentation">📖</a> <a href="#infra-kentcdodds" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a> <a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=kentcdodds" title="Tests">⚠️</a></td>
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<td align="center"><a href="https://github.com/threepointone"><img src="https://avatars1.githubusercontent.com/u/18808?v=3?s=100" width="100px;" alt=""/><br /><sub><b>Sunil Pai</b></sub></a><br /><a href="#ideas-threepointone" title="Ideas, Planning, & Feedback">🤔</a></td>
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<td align="center"><a href="http://suchipi.com"><img src="https://avatars0.githubusercontent.com/u/1341513?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Lily Scott</b></sub></a><br /><a href="#question-suchipi" title="Answering Questions">💬</a> <a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=suchipi" title="Documentation">📖</a></td>
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<td align="center"><a href="http://twitter.com/dralletje"><img src="https://avatars1.githubusercontent.com/u/767261?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Michiel Dral</b></sub></a><br /><a href="#ideas-dralletje" title="Ideas, Planning, & Feedback">🤔</a></td>
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<td align="center"><a href="https://github.com/tkh44"><img src="https://avatars2.githubusercontent.com/u/662750?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Kye Hohenberger</b></sub></a><br /><a href="#ideas-tkh44" title="Ideas, Planning, & Feedback">🤔</a></td>
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<td align="center"><a href="https://hamil.town"><img src="https://avatars1.githubusercontent.com/u/11481355?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Mitchell Hamilton</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=mitchellhamilton" title="Code">💻</a> <a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=mitchellhamilton" title="Tests">⚠️</a></td>
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<td align="center"><a href="https://github.com/wKovacs64"><img src="https://avatars1.githubusercontent.com/u/1288694?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Justin Hall</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=wKovacs64" title="Documentation">📖</a></td>
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</tr>
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<tr>
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<td align="center"><a href="https://github.com/PiereDome"><img src="https://avatars3.githubusercontent.com/u/1903016?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Brian Pedersen</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=PiereDome" title="Code">💻</a> <a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=PiereDome" title="Documentation">📖</a></td>
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<td align="center"><a href="https://github.com/apalm"><img src="https://avatars3.githubusercontent.com/u/4495237?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Andrew Palm</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=apalm" title="Code">💻</a></td>
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<td align="center"><a href="https://michaelhsu.tw/"><img src="https://avatars1.githubusercontent.com/u/1527371?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Michael Hsu</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=evenchange4" title="Documentation">📖</a> <a href="#plugin-evenchange4" title="Plugin/utility libraries">🔌</a></td>
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<td align="center"><a href="https://github.com/citycide"><img src="https://avatars2.githubusercontent.com/u/16605186?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Bo Lingen</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=citycide" title="Code">💻</a></td>
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<td align="center"><a href="https://github.com/tylerthehaas"><img src="https://avatars1.githubusercontent.com/u/11150235?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Tyler Haas</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=tylerthehaas" title="Documentation">📖</a></td>
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<td align="center"><a href="https://github.com/FWeinb"><img src="https://avatars0.githubusercontent.com/u/1250430?v=4?s=100" width="100px;" alt=""/><br /><sub><b>FWeinb</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=FWeinb" title="Code">💻</a></td>
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<td align="center"><a href="http://www.tomasehrlich.cz"><img src="https://avatars2.githubusercontent.com/u/827862?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Tomáš Ehrlich</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/issues?q=author%3Atricoder42" title="Bug reports">🐛</a> <a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=tricoder42" title="Code">💻</a></td>
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</tr>
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<tr>
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<td align="center"><a href="https://github.com/jgierer12"><img src="https://avatars0.githubusercontent.com/u/4331946?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Jonas Gierer</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=jgierer12" title="Documentation">📖</a></td>
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<td align="center"><a href="http://loicpadier.com"><img src="https://avatars2.githubusercontent.com/u/4009640?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Loïc Padier</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=lPadier" title="Code">💻</a></td>
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<td align="center"><a href="https://www.pshrmn.com"><img src="https://avatars0.githubusercontent.com/u/1127037?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Paul Sherman</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=pshrmn" title="Code">💻</a></td>
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<td align="center"><a href="http://burningpotato.com"><img src="https://avatars1.githubusercontent.com/u/540777?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Conrad Buck</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=conartist6" title="Code">💻</a> <a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=conartist6" title="Tests">⚠️</a> <a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=conartist6" title="Documentation">📖</a></td>
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<td align="center"><a href="https://github.com/InvictusMB"><img src="https://avatars3.githubusercontent.com/u/3091209?v=4?s=100" width="100px;" alt=""/><br /><sub><b>InvictusMB</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=InvictusMB" title="Tests">⚠️</a></td>
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<td align="center"><a href="https://codefund.io"><img src="https://avatars2.githubusercontent.com/u/12481?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Eric Berry</b></sub></a><br /><a href="#fundingFinding-coderberry" title="Funding Finding">🔍</a></td>
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<td align="center"><a href="http://futagoza.github.io/"><img src="https://avatars1.githubusercontent.com/u/1943570?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Futago-za Ryuu</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=futagoza" title="Code">💻</a> <a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=futagoza" title="Tests">⚠️</a></td>
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</tr>
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<tr>
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<td align="center"><a href="https://luc.im"><img src="https://avatars3.githubusercontent.com/u/6616955?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Luc</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=lucleray" title="Code">💻</a></td>
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<td align="center"><a href="http://wintercounter.me"><img src="https://avatars2.githubusercontent.com/u/963776?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Victor Vincent</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=wintercounter" title="Code">💻</a></td>
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<td align="center"><a href="http://mvasilkov.ovh"><img src="https://avatars3.githubusercontent.com/u/140257?v=4?s=100" width="100px;" alt=""/><br /><sub><b>я котик пур-пур</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=mvasilkov" title="Documentation">📖</a></td>
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<td align="center"><a href="http://armandososa.com"><img src="https://avatars0.githubusercontent.com/u/139577?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Armando Sosa</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=soska" title="Documentation">📖</a></td>
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<td align="center"><a href="https://github.com/matvp91"><img src="https://avatars3.githubusercontent.com/u/12699796?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Matthias</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=matvp91" title="Code">💻</a></td>
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<td align="center"><a href="https://www.jovidecroock.com/"><img src="https://avatars3.githubusercontent.com/u/17125876?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Jovi De Croock</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=JoviDeCroock" title="Code">💻</a> <a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=JoviDeCroock" title="Tests">⚠️</a></td>
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<td align="center"><a href="http://victorarowo.com"><img src="https://avatars0.githubusercontent.com/u/25545108?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Victor Arowo</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=VictorArowo" title="Documentation">📖</a></td>
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</tr>
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<tr>
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<td align="center"><a href="https://twitter.com/alexandermchan"><img src="https://avatars.githubusercontent.com/u/1864372?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Alex Chan</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=alexanderchan" title="Documentation">📖</a></td>
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<td align="center"><a href="https://probablyup.com"><img src="https://avatars.githubusercontent.com/u/570070?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Evan Jacobs</b></sub></a><br /><a href="https://github.com/kentcdodds/babel-plugin-macros/commits?author=probablyup" title="Code">💻</a></td>
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</tr>
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</table>
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<!-- markdownlint-restore -->
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<!-- prettier-ignore-end -->
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<!-- ALL-CONTRIBUTORS-LIST:END -->
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This project follows the [all-contributors][all-contributors] specification.
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Contributions of any kind welcome!
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## LICENSE
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MIT
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<!-- prettier-ignore-start -->
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[npm]: https://www.npmjs.com
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[node]: https://nodejs.org
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[build-badge]: https://img.shields.io/github/workflow/status/kentcdodds/babel-plugin-macros/validate?logo=github&style=flat-square
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[build]: https://github.com/kentcdodds/babel-plugin-macros/actions?query=workflow%3Avalidate
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[coverage-badge]: https://img.shields.io/codecov/c/github/kentcdodds/babel-plugin-macros.svg?style=flat-square
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[coverage]: https://codecov.io/github/kentcdodds/babel-plugin-macros
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[version-badge]: https://img.shields.io/npm/v/babel-plugin-macros.svg?style=flat-square
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[package]: https://www.npmjs.com/package/babel-plugin-macros
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[downloads-badge]: https://img.shields.io/npm/dm/babel-plugin-macros.svg?style=flat-square
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[npmtrends]: http://www.npmtrends.com/babel-plugin-macros
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[license-badge]: https://img.shields.io/npm/l/babel-plugin-macros.svg?style=flat-square
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[license]: https://github.com/kentcdodds/babel-plugin-macros/blob/main/LICENSE
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[prs-badge]: https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square
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[prs]: http://makeapullrequest.com
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[coc-badge]: https://img.shields.io/badge/code%20of-conduct-ff69b4.svg?style=flat-square
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[coc]: https://github.com/kentcdodds/babel-plugin-macros/blob/main/CODE_OF_CONDUCT.md
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[emojis]: https://github.com/all-contributors/all-contributors#emoji-key
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[all-contributors]: https://github.com/all-contributors/all-contributors
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[all-contributors-badge]: https://img.shields.io/github/all-contributors/kentcdodds/babel-plugin-macros?color=orange&style=flat-square
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[bugs]: https://github.com/kentcdodds/babel-plugin-macros/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+sort%3Acreated-desc+label%3Abug
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[requests]: https://github.com/kentcdodds/babel-plugin-macros/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+sort%3Areactions-%2B1-desc+label%3Aenhancement
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[good-first-issue]: https://github.com/kentcdodds/babel-plugin-macros/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+sort%3Areactions-%2B1-desc+label%3Aenhancement+label%3A%22good+first+issue%22
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[preval]: https://github.com/kentcdodds/babel-plugin-preval
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[cra]: https://github.com/facebook/create-react-app
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[cra-issue]: https://github.com/facebook/create-react-app/issues/2730
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