fix(enhanced): add esm export for runtime entry to fix vite resolution

[2heal1]

This change adds an ESM export for the runtime entry in @module-federation/enhanced to resolve Vite compatibility issues where it couldn't properly resolve the module.

• Modified packages/enhanced/package.json to include .mjs import for the runtime entry.
• Updated packages/enhanced/tsdown.config.mts to build the ESM runtime entry with .mjs extension.

Fixes #4680

Change-Id: If3915f016731bb1a3612ec4e4c9c2cc2cd84ecca

Description

Related Issue

#4680

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have added tests to cover my changes.
• All new and existing tests passed.
• I have updated the documentation.

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commit: 9e649a4

[github-actions]

Bundle Size Report

10 package(s) changed, 30 unchanged.

Package dist + ESM entry

Package	Total dist (raw)	Delta	ESM gzip	Delta
@module-federation/cli	26.3 kB	no change	786 B	no change
@module-federation/core	39.1 kB	no change	173 B	no change
@module-federation/devtools	487.9 kB	+6.6 kB (+1.4%)	3.9 kB	no change
@module-federation/enhanced	814.1 kB	+70 B (+0.0%)	672 B	no change
@module-federation/managers	69.8 kB	no change	334 B	no change
@module-federation/manifest	138.0 kB	no change	182 B	no change
@module-federation/metro-plugin-rnc-cli	0 B	no change	314 B	no change
@module-federation/node	193.4 kB	no change	217 B	no change
@module-federation/storybook-addon	77.6 kB	no change	100 B	no change
@module-federation/utilities	110.6 kB	no change	328 B	no change

Bundle targets

Package	Web bundle (gzip)	Delta	Node bundle (gzip)	Delta
@module-federation/cli	2.3 kB	-31 B (-1.3%)	2.3 kB	-31 B (-1.3%)
@module-federation/core	1.1 kB	-30 B (-2.7%)	1.0 kB	-29 B (-2.7%)
@module-federation/devtools	21.3 kB	-27 B (-0.1%)	21.3 kB	-27 B (-0.1%)
@module-federation/enhanced	2.6 kB	-43 B (-1.6%)	2.6 kB	-43 B (-1.6%)
@module-federation/managers	2.4 kB	-26 B (-1.0%)	2.4 kB	-26 B (-1.0%)
@module-federation/manifest	6.2 kB	-36 B (-0.6%)	6.2 kB	-36 B (-0.6%)
@module-federation/metro-plugin-rnc-cli	411 B	-24 B (-5.5%)	411 B	-24 B (-5.5%)
@module-federation/node	9.2 kB	-27 B (-0.3%)	9.2 kB	-27 B (-0.3%)
@module-federation/storybook-addon	1.9 kB	-22 B (-1.1%)	1.7 kB	-22 B (-1.2%)
@module-federation/utilities	2.6 kB	-31 B (-1.2%)	2.6 kB	-31 B (-1.2%)

Consumer scenarios

Scenario	Web output (gzip)	Delta	Node output (gzip)	Delta	Gap (node-web)	Delta
Enhanced remoteEntry	19.8 kB	-20 B (-0.1%)	20.8 kB	-15 B (-0.1%)	+1.0 kB	+5 B

Total dist (raw): 6.33 MB (+6.6 kB (+0.1%))
Total ESM gzip: 74.0 kB (no change)
Total web bundle (gzip): 179.5 kB (-297 B (-0.2%))
Total node bundle (gzip): 180.0 kB (-296 B (-0.2%))
Tracked ./bundler entry gzip: 556 B (no change)
Tracked ./bundler web bundle (gzip): 4.8 kB (no change)
Tracked ./bundler node bundle (gzip): 4.8 kB (no change)

Bundle sizes are generated with rslib (Rspack). Package-root metrics preserve the historical report. Tracked subpath exports such as ./bundler are measured separately so ENV_TARGET-driven tree-shaking is visible. Bare imports are externalized to keep package-level sizes consistent, and assets are emitted as resources.