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type * as _ts from 'typescript';\nimport type { RegisterOptions } from '.';\nimport { versionGteLt } from './util';\n\n/**\n * Centralized specification of how we deal with file extensions based on\n * project options:\n * which ones we do/don't support, in what situations, etc. These rules drive\n * logic elsewhere.\n * @internal\n * */\nexport type Extensions = ReturnType<typeof getExtensions>;\n\nconst nodeEquivalents = new Map<string, string>([\n ['.ts', '.js'],\n ['.tsx', '.js'],\n ['.jsx', '.js'],\n ['.mts', '.mjs'],\n ['.cts', '.cjs'],\n]);\n\nconst tsResolverEquivalents = new Map<string, readonly string[]>([\n ['.ts', ['.js']],\n ['.tsx', ['.js', '.jsx']],\n ['.mts', ['.mjs']],\n ['.cts', ['.cjs']],\n]);\n\n// All extensions understood by vanilla node\nconst vanillaNodeExtensions: readonly string[] = [\n '.js',\n '.json',\n '.node',\n '.mjs',\n '.cjs',\n];\n\n// Extensions added by vanilla node's require() if you omit them:\n// js, json, node\n// Extensions added by vanilla node if you omit them with --experimental-specifier-resolution=node\n// js, json, node, mjs\n// Extensions added by ESM codepath's legacy package.json \"main\" resolver\n// js, json, node (not mjs!)\n\nconst nodeDoesNotUnderstand: readonly string[] = [\n '.ts',\n '.tsx',\n '.jsx',\n '.cts',\n '.mts',\n];\n\n/**\n * [MUST_UPDATE_FOR_NEW_FILE_EXTENSIONS]\n * @internal\n */\nexport function getExtensions(\n config: _ts.ParsedCommandLine,\n options: RegisterOptions,\n tsVersion: string\n) {\n // TS 4.5 is first version to understand .cts, .mts, .cjs, and .mjs extensions\n const tsSupportsMtsCtsExts = versionGteLt(tsVersion, '4.5.0');\n\n const requiresHigherTypescriptVersion: string[] = [];\n if (!tsSupportsMtsCtsExts)\n requiresHigherTypescriptVersion.push('.cts', '.cjs', '.mts', '.mjs');\n\n const allPossibleExtensionsSortedByPreference = Array.from(\n new Set([\n ...(options.preferTsExts ? nodeDoesNotUnderstand : []),\n ...vanillaNodeExtensions,\n ...nodeDoesNotUnderstand,\n ])\n );\n\n const compiledJsUnsorted: string[] = ['.ts'];\n const compiledJsxUnsorted: string[] = [];\n\n if (config.options.jsx) compiledJsxUnsorted.push('.tsx');\n if (tsSupportsMtsCtsExts) compiledJsUnsorted.push('.mts', '.cts');\n if (config.options.allowJs) {\n compiledJsUnsorted.push('.js');\n if (config.options.jsx) compiledJsxUnsorted.push('.jsx');\n if (tsSupportsMtsCtsExts) compiledJsUnsorted.push('.mjs', '.cjs');\n }\n\n const compiledUnsorted = [...compiledJsUnsorted, ...compiledJsxUnsorted];\n const compiled = allPossibleExtensionsSortedByPreference.filter((ext) =>\n compiledUnsorted.includes(ext)\n );\n\n const compiledNodeDoesNotUnderstand = nodeDoesNotUnderstand.filter((ext) =>\n compiled.includes(ext)\n );\n\n /**\n * TS's resolver can resolve foo.js to foo.ts, by replacing .js extension with several source extensions.\n * IMPORTANT: Must preserve ordering according to preferTsExts!\n * Must include the .js/.mjs/.cjs extension in the array!\n * This affects resolution behavior!\n * [MUST_UPDATE_FOR_NEW_FILE_EXTENSIONS]\n */\n const r = allPossibleExtensionsSortedByPreference.filter((ext) =>\n [...compiledUnsorted, '.js', '.mjs', '.cjs', '.mts', '.cts'].includes(ext)\n );\n const replacementsForJs = r.filter((ext) =>\n ['.js', '.jsx', '.ts', '.tsx'].includes(ext)\n );\n const replacementsForJsx = r.filter((ext) => ['.jsx', '.tsx'].includes(ext));\n const replacementsForMjs = r.filter((ext) => ['.mjs', '.mts'].includes(ext));\n const replacementsForCjs = r.filter((ext) => ['.cjs', '.cts'].includes(ext));\n const replacementsForJsOrMjs = r.filter((ext) =>\n ['.js', '.jsx', '.ts', '.tsx', '.mjs', '.mts'].includes(ext)\n );\n\n // Node allows omitting .js or .mjs extension in certain situations (CJS, ESM w/experimental flag)\n // So anything that compiles to .js or .mjs can also be omitted.\n const experimentalSpecifierResolutionAddsIfOmitted = Array.from(\n new Set([...replacementsForJsOrMjs, '.json', '.node'])\n );\n // Same as above, except node curiuosly doesn't do .mjs here\n const legacyMainResolveAddsIfOmitted = Array.from(\n new Set([...replacementsForJs, '.json', '.node'])\n );\n\n return {\n /** All file extensions we transform, ordered by resolution preference according to preferTsExts */\n compiled,\n /** Resolved extensions that vanilla node will not understand; we should handle them */\n nodeDoesNotUnderstand,\n /** Like the above, but only the ones we're compiling */\n compiledNodeDoesNotUnderstand,\n /**\n * Mapping from extensions understood by tsc to the equivalent for node,\n * as far as getFormat is concerned.\n */\n nodeEquivalents,\n /**\n * Mapping from extensions rejected by TSC in import specifiers, to the\n * possible alternatives that TS's resolver will accept.\n *\n * When we allow users to opt-in to .ts extensions in import specifiers, TS's\n * resolver requires us to replace the .ts extensions with .js alternatives.\n * Otherwise, resolution fails.\n *\n * Note TS's resolver is only used by, and only required for, typechecking.\n * This is separate from node's resolver, which we hook separately and which\n * does not require this mapping.\n */\n tsResolverEquivalents,\n /**\n * Extensions that we can support if the user upgrades their typescript version.\n * Used when raising hints.\n */\n requiresHigherTypescriptVersion,\n /**\n * --experimental-specifier-resolution=node will add these extensions.\n */\n experimentalSpecifierResolutionAddsIfOmitted,\n /**\n * ESM loader will add these extensions to package.json \"main\" field\n */\n legacyMainResolveAddsIfOmitted,\n replacementsForMjs,\n replacementsForCjs,\n replacementsForJsx,\n replacementsForJs,\n };\n}\n"]} |