Optimize utf8 decoder #1307

	name: Read size

	on:
	pull_request:
	paths:
	- 'src/**'
	- 'package.json'
	- 'utils/build/**'

	# This workflow runs in a read-only environment. We can safely checkout
	# the PR code here.
	# Reference:
	# https://securitylab.github.com/research/github-actions-preventing-pwn-requests/
	permissions:
	contents: read

	jobs:
	read-size:
	name: Tree-shaking
	runs-on: ubuntu-latest
	steps:
	- name: Git checkout
	uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
	- name: Install Node
	uses: actions/setup-node@60edb5dd545a775178f52524783378180af0d1f8 # v4
	with:
	node-version: 18
	cache: 'npm'
	- name: Install dependencies
	run: npm ci
	- name: Build
	run: npm run build
	- name: === Test tree-shaking ===
	run: npm run test-treeshake
	- name: Read bundle sizes
	id: read-size
	run: \|
	FILESIZE=$(stat --format=%s build/three.module.min.js)
	gzip -k build/three.module.min.js
	FILESIZE_GZIP=$(stat --format=%s build/three.module.min.js.gz)
	TREESHAKEN=$(stat --format=%s test/treeshake/index.bundle.min.js)
	gzip -k test/treeshake/index.bundle.min.js
	TREESHAKEN_GZIP=$(stat --format=%s test/treeshake/index.bundle.min.js.gz)
	PR=${{ github.event.pull_request.number }}

	# write the output in a json file to upload it as artifact
	node -pe "JSON.stringify({ filesize: $FILESIZE, gzip: $FILESIZE_GZIP, treeshaken: $TREESHAKEN, treeshakenGzip: $TREESHAKEN_GZIP, pr: $PR })" > sizes.json
	- name: Upload artifact
	uses: actions/upload-artifact@1746f4ab65b179e0ea60a494b83293b640dd5bba # v4
	with:
	name: sizes
	path: sizes.json

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