Function getMappedImportUrl

site/demo.ts:54–72

(
  specifier: string,
  importMap: {[specifier: string]: string},
  baseUrl: string,
)

  /^https?:\/\//.test(url) ? url : new URL(url, baseUrl).href;

const getMappedImportUrl = (
  specifier: string,
  importMap: {[specifier: string]: string},
  baseUrl: string,
): string | undefined => {
  const exact = importMap[specifier];
  if (exact != null) {
    return absolutizeImportUrl(exact, baseUrl);
  }
  const prefix = Object.keys(importMap)
    .filter((key) => specifier.startsWith(key + '/'))
    .sort((a, b) => b.length - a.length)[0];
  return prefix == null
    ? undefined
    : absolutizeImportUrl(
        importMap[prefix]! + specifier.slice(prefix.length),
        baseUrl,
      );
};

export const getPublishedImportUrl = (
  specifier: string,