types: allow passing user config to mergeEnvironmentConfig

[9aoy]

Summary

update mergeEnvironmentConfig type, support use userConfig override extraConfig fields.

const myPlugin = () => ({
  setup: (api) => {
    api.modifyEnvironmentConfig((userConfig, { mergeEnvironmentConfig }) => {
      const extraConfig: EnvironmentConfig = {
        source: {
          // ...
        },
        output: {
          // ...
        },
      };

      return mergeEnvironmentConfig(extraConfig, userConfig);
    });
  },
});

Related Links

Checklist

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

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