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feat(exoflex): add babel plugin for rewriting imports #341

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feat(exoflex): add babel plugin for rewriting imports #341

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darcien
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@darcien darcien commented Feb 7, 2020

Mostly a port from the babel plugin in react-native-paper.

Original file:
https://github.com/callstack/react-native-paper/blob/5870fb3ef5fbb6aeb9aa95db942c1ac009e6a3b0/src/babel/index.js

Tried using it on the example project but can't seem to reduce the bundle size even when deleting some of the imports.

image

@darcien darcien added this to the exoflex v3.2.0 milestone Feb 7, 2020
@oshimayoan oshimayoan linked an issue Feb 7, 2020 that may be closed by this pull request
exoflex: babel-plugin #331
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darcien commented Feb 14, 2020 •
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Tested with a fresh expo web project and du for checking the size:

du -sh web-build output:
- clean 1.3M
- with master exoflex {Calendar} babel-plugin=false 7.1M
- with master exoflex {Calendar} babel-plugin=true 7.1M
- with master exoflex {Calendar} sideEffects=false babel-plugin=false 5.7M
- with master exoflex {Calendar} sideEffects=false babel-plugin=true 5.7M
- with master exoflex {Provider, Text} babel-plugin=false 7.1M
- with master exoflex {Provider, Text} sideEffects=false babel-plugin=false 5.1M

exoflex installed with yarn link

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darcien commented Feb 14, 2020

Bonus, output from webpack-bundle-analyzer
image

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darcien commented Feb 14, 2020 •
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The sideEffects mentioned before is a property in the package.json.

The webpack 2 release came with built-in support for ES2015 modules (alias harmony modules) as well as unused module export detection. The new webpack 4 release expands on this capability with a way to provide hints to the compiler via the "sideEffects" package.json property to denote which files in your project are "pure" and therefore safe to prune if unused.
https://webpack.js.org/guides/tree-shaking/

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@darcien I got a slightly different size from you.

`du -sh web-build` output:
- clean 1.0M
- with [email protected] {Provider, Text} no babel-plugin 6.6M
- with [email protected] {Provider, Text} babel-plugin-transform-imports 5.1M
- with [email protected] {Text} babel-plugin-transform-imports 5.0M

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oshimayoan commented Feb 19, 2020 •
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Exoflex becomes a smaller piece, look at the red highlight.
image

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darcien commented Feb 19, 2020

@darcien I got a slightly different size from you.

`du -sh web-build` output:
- clean 1.0M
- with [email protected] {Provider, Text} no babel-plugin 6.6M
- with [email protected] {Provider, Text} babel-plugin-transform-imports 5.1M
- with [email protected] {Text} babel-plugin-transform-imports 5.0M

Oh, I'm using the master version, with yarn link, not from the npm

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oshimayoan commented Feb 19, 2020 •
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I see. Have you test it on an Android bundle and check the APK size? Mine is not changing at all whether I use the plugin or not, it still at 49.5M which is pretty big for importing Provider and Text only.

EDIT:
I used expo to build the APK.

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I've tried to build some APKs using ./gradlew assembleRelease and here's what I got:

All comparison is using [email protected] with {Provider, Text}.

No babel plugin:

du -sh app/build/outputs/apk/release/*.apk
 11M    app/build/outputs/apk/release/app-arm64-v8a-release.apk
 11M    app/build/outputs/apk/release/app-armeabi-v7a-release.apk
 24M    app/build/outputs/apk/release/app-universal-release.apk
 11M    app/build/outputs/apk/release/app-x86-release.apk
 11M    app/build/outputs/apk/release/app-x86_64-release.apk

Using react-native-paper/babel:

du -sh app/build/outputs/apk/release/*.apk
 11M    app/build/outputs/apk/release/app-arm64-v8a-release.apk
 11M    app/build/outputs/apk/release/app-armeabi-v7a-release.apk
 24M    app/build/outputs/apk/release/app-universal-release.apk
 11M    app/build/outputs/apk/release/app-x86-release.apk
 11M    app/build/outputs/apk/release/app-x86_64-release.apk

Using babel-plugin-transform-imports:

du -sh app/build/outputs/apk/release/*.apk
 10M    app/build/outputs/apk/release/app-arm64-v8a-release.apk
 10M    app/build/outputs/apk/release/app-armeabi-v7a-release.apk
 23M    app/build/outputs/apk/release/app-universal-release.apk
 10M    app/build/outputs/apk/release/app-x86-release.apk
 10M    app/build/outputs/apk/release/app-x86_64-release.apk

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I wonder why using react-native-paper/babel doesn't have any effect on the APK size.

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darcien commented Feb 19, 2020

I wonder why using react-native-paper/babel doesn't have any effect on the APK size.

Have you tried using exoflex/babel? Using the babel plugin from paper won't have much effect to the code.

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I haven't tried exoflex/babel yet. How do I use it?

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Never mind, found it!

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darcien commented Feb 19, 2020 •
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I haven't tried exoflex/babel yet. How do I use it?

I forgot to tell you it's only available in this branch because it's a new feature 😆

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sstur commented Feb 21, 2020

a way to provide hints to the compiler via the "sideEffects" package.json property

This whole PR is awesome.

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sstur approved these changes Feb 21, 2020
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🚢 it!

packages/exoflex/scripts/generate-mappings.js
Comment on lines +10 to +19
const ast = parser.parse(source, {
sourceType: 'module',
plugins: [
'jsx',
'typescript',
'objectRestSpread',
'classProperties',
'asyncGenerators',
],
});
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This is exactly what I need for the vision-ui source transformer! (although I need to use the typescript parser)

packages/exoflex/src/babel/__fixtures__/rewrite-imports/output.js
import { Provider as ExoflexProvider } from "exoflex/lib/module/components";
import { Button } from "exoflex/lib/module/components";
import { Label } from "exoflex/lib/module/components/Typography";
import { NonExistent, NonExistentSecond as Stuff } from "exoflex/lib/module/index.js";
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Why is there a .js on the end of this line but not the others?

@oshimayoan oshimayoan modified the milestones: exoflex v3.3.0, exoflex v3.4.0 Mar 30, 2020
@oshimayoan oshimayoan removed this from the exoflex v3.4.0 milestone May 27, 2020
@darcien darcien closed this Feb 17, 2023
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exoflex: babel-plugin
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@darcien @oshimayoan @sstur