fix: suppress ESModulesLinkingError for exports that might be implemented in mock

[9aoy]

Summary

suppress ESModulesLinkingError for exports that might be implemented in mock.

ESModulesLinkingError: export 'mockApiClient' (imported as 'mockApiFile') was not found in '../../services' (possible exports...

mock modules:

class MockApiClient extends ApiClient {
  fetch = rstest.fn().mockResolvedValue({ json: () => Promise.resolve({ data: [] }) })
}
export const mockApiClient = new MockApiClient({ baseDomain: 'https://example.com' });

Related Links

#698

Checklist

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

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[Copilot]

Pull Request Overview

This PR suppresses ESModulesLinkingError warnings that occur when mocked modules export properties that don't exist in the original module by changing the exportsPresence configuration from 'error' to 'warn'.

• Changed rspack's exportsPresence parser option from 'error' to 'warn' to allow mock modules to add exports not present in the original module
• Added E2E test to verify that ESModulesLinkingError is not thrown when mocking modules with additional exports
• Updated test snapshots to reflect the new configuration

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
packages/core/src/core/plugins/basic.ts	Added exportsPresence: 'warn' configuration to suppress ESModulesLinkingError when mocks define exports not in the original module
packages/core/tests/core/snapshots/rsbuild.test.ts.snap	Updated all 5 snapshot occurrences to reflect the change from "error" to "warn"
e2e/mock/tests/esModulesLinkingError.test.ts	Added E2E test that verifies ESModulesLinkingError is not printed when running tests with mocked exports
e2e/mock/fixtures/esModulesLinkingError/index.test.ts	Created test fixture that mocks a module with exports not present in the original
e2e/mock/fixtures/esModulesLinkingError/services/index.js	Created minimal module that exports a while the mock provides value

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[chenjiahan]

Should we use fix instead of chore in the PR title?