@custom-elements-manifest/analyzer/src/utils/resolver-config.js

<!-- [=> See Source <=](../../docs/analyzer/index.md) -->

/**
 * @typedef {import('oxc-resolver').NapiResolveOptions} NapiResolveOptions
 */

/**
 * Default resolution options for oxc-resolver
 * @type {NapiResolveOptions}
 */
export const DEFAULT_RESOLUTION_OPTIONS = {
  extensions: [".js", ".ts", ".jsx", ".tsx", ".json", ".d.ts", ""],
  extensionAlias: {
    ".js": [".ts", ".js"],
    ".jsx": [".tsx", ".jsx"],
  },
  mainFiles: ["index"],
  mainFields: ["module", "browser", "main"],
  conditionNames: ["import", "require", "node"],
  exportsFields: ["exports"],
  alias: {},
  symlinks: true,
  modules: ["node_modules"],
};

/**
 * Merge user provided resolution options with defaults
 * @param {NapiResolveOptions | undefined} userOptions - User config resolution options
 * @returns {NapiResolveOptions}
 */
export function mergeResolutionOptions(userOptions) {
  // Priority: CLI > user config > defaults
  const merged = {
    ...DEFAULT_RESOLUTION_OPTIONS,
    ...(userOptions || {}),
  };

  // Handle special merging for extensionAlias
  if (userOptions?.extensionAlias) {
    merged.extensionAlias = {
      ...DEFAULT_RESOLUTION_OPTIONS.extensionAlias,
      ...(userOptions?.extensionAlias || {}),
    };
  }

  return merged;
}