feat(core): add logLevel config

[chenjiahan]

Summary

Adding support for configurable log levels, which is syntactic sugar for logger.level = '...'.

It is worth noting that the current logLevel still has some limitations. Since the logger object is a global singleton, if the user creates multiple Rsbuild instances at the same time, they must set the same logLevel value.

Related Links

• [Feature]: Support loglevel in rsbuild #1582

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

Adds a new logLevel configuration option to control logger verbosity and integrates it into the core and CLI entrypoints.

• Introduce logLevel in the public RsbuildConfig interface with supported levels 'info', 'warn', and 'error'.
• Apply config.logLevel to logger.level during Rsbuild initialization.
• Replace console.log() in the CLI bootstrap with logger.log() for consistency.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/core/src/types/config.ts	Added logLevel field and its JSDoc to RsbuildConfig.
packages/core/src/createRsbuild.ts	Set logger.level based on config.logLevel.
packages/core/src/cli/index.ts	Swapped console.log() for logger.log() to emit a blank line.

Comments suppressed due to low confidence (3)

packages/core/src/createRsbuild.ts:170

• There are no tests verifying that setting logLevel updates logger.level. Consider adding a unit test to cover this new behavior.

if (config.logLevel) {

packages/core/src/types/config.ts:1785

• [nitpick] The logLevel option is introduced here, but external docs or the README should be updated to show how to configure and use this option in practice.

logLevel?: 'info' | 'warn' | 'error';

packages/core/src/cli/index.ts:27

• Calling logger.log() with no arguments may not produce a blank line as console.log() did. Consider using logger.log('') or extending the logger API to explicitly support empty-line logging.

logger.log();