Runtime helper property name is not minified

[sapphi-red]

Describe the regression

Runtime helpers like classPrivateFieldSet2 are kept while they are minified when using esbuild.

Reproduction

https://stackblitz.com/edit/vitejs-rolldown-vite-v6rqx1uj?file=src%2Fmain.js

Expected Behavior

Runtime helpers' names are minified.

Actual Behavior

Runtime helpers' names are not minified.

Steps to Reproduce

No response

System Info

StackBlitz

  System:
    OS: Linux 5.0 undefined
    CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  Binaries:
    Node: 20.19.1 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 10.8.2 - /usr/local/bin/npm
    pnpm: 8.15.6 - /usr/local/bin/pnpm
  npmPackages:
    rolldown-vite:  6.3.14

Used Package Manager

npm

Logs

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs and the Rolldown-related guide.
• Check that there isn't already an issue that reports the same regression to avoid creating a duplicate.
• Check that this is a concrete regression. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the regression.

[sapphi-red]

rolldown-vite/packages/vite/src/node/plugins/oxc.ts

Lines 393 to 468 in b3d8c5f

	const runtimeHelpers = Object.entries(res.helpersUsed)
	if (runtimeHelpers.length > 0) {
	const helpersCode = await generateRuntimeHelpers(runtimeHelpers)
	switch (opts.format) {
	case 'es': {
	if (res.code.startsWith('#!')) {
	let secondLinePos = res.code.indexOf('\n')
	if (secondLinePos === -1) {
	secondLinePos = 0
	}
	// inject after hashbang
	res.code =
	res.code.slice(0, secondLinePos) +
	helpersCode +
	res.code.slice(secondLinePos)
	if (res.map) {
	res.map.mappings = res.map.mappings.replace(';', ';;')
	}
	} else {
	res.code = helpersCode + res.code
	if (res.map) {
	res.map.mappings = ';' + res.map.mappings
	}
	}
	break
	}
	case 'cjs': {
	if (/^\s*['"]use strict['"];/.test(res.code)) {
	// inject after use strict
	res.code = res.code.replace(
	/^\s*['"]use strict['"];/,
	(m) => m + helpersCode,
	)
	// no need to update sourcemap because the runtime helpers are injected in the same line with "use strict"
	} else {
	res.code = helpersCode + res.code
	if (res.map) {
	res.map.mappings = ';' + res.map.mappings
	}
	}
	break
	}
	// runtime helpers needs to be injected inside the UMD and IIFE wrappers
	// to avoid collision with other globals.
	// We inject the helpers inside the wrappers.
	// e.g. turn:
	// (function(){ /*actual content/* })()
	// into:
	// (function(){ <runtime helpers> /*actual content/* })()
	// Not using regex because it's too hard to rule out performance issues like #8738 #8099 #10900 #14065
	// Instead, using plain string index manipulation (indexOf, slice) which is simple and performant
	// We don't need to create a MagicString here because both the helpers and
	// the headers don't modify the sourcemap
	case 'iife':
	case 'umd': {
	const m = (
	opts.format === 'iife' ? IIFE_BEGIN_RE : UMD_BEGIN_RE
	).exec(res.code)
	if (!m) {
	this.error('Unexpected IIFE format')
	return
	}
	const pos = m.index + m[0].length
	res.code =
	res.code.slice(0, pos) + helpersCode + '\n' + res.code.slice(pos)
	break
	}
	case 'app': {
	throw new Error('format: "app" is not supported yet')
	break
	}
	default: {
	opts.format satisfies never
	}
	}
	}