Duffer Derek

{"version":3,"sources":["../../src/build/load-entrypoint.ts"],"sourcesContent":["import fs from 'fs/promises'\nimport path from 'path'\n\n// NOTE: this should be updated if this loader file is moved.\nconst PACKAGE_ROOT = path.normalize(path.join(__dirname, '../../..'))\nconst TEMPLATE_FOLDER = path.join(__dirname, 'templates')\nconst TEMPLATES_ESM_FOLDER = path.normalize(\n  path.join(__dirname, '../../dist/esm/build/templates')\n)\n\n/**\n * Load the entrypoint file from the ESM directory and performs string\n * replacements of the template variables specified in the `replacements`\n * argument.\n *\n * For non-string replacements, the template should use the\n * `declare const ${key}: ${type}` syntax. to ensure that the type is correct\n * and the typescript can compile. You may have to use `@ts-expect-error` to\n * handle replacement values that are related to imports.\n *\n * @param entrypoint the entrypoint to load\n * @param replacements string replacements to perform\n * @param injections code injections to perform\n * @param imports optional imports to insert or set to null\n * @returns the loaded file with the replacements\n */\nexport async function loadEntrypoint(\n  entrypoint:\n    | 'app-page'\n    | 'app-route'\n    | 'edge-app-route'\n    | 'edge-ssr'\n    | 'edge-ssr-app'\n    | 'middleware'\n    | 'pages'\n    | 'pages-api',\n  replacements: Record<`VAR_${string}`, string>,\n  injections?: Record<string, string>,\n  imports?: Record<string, string | null>\n): Promise<string> {\n  const filepath = path.resolve(\n    path.join(TEMPLATES_ESM_FOLDER, `${entrypoint}.js`)\n  )\n\n  let file = await fs.readFile(filepath, 'utf8')\n\n  // Update the relative imports to be absolute. This will update any relative\n  // imports to be relative to the root of the `next` package.\n  let count = 0\n  file = file.replaceAll(\n    /from '(\\..*)'|import '(\\..*)'/g,\n    function (_, fromRequest, importRequest) {\n      count++\n\n      const relative = path\n        .relative(\n          PACKAGE_ROOT,\n          path.resolve(TEMPLATE_FOLDER, fromRequest ?? importRequest)\n        )\n        // Ensure that we use linux style path separators for node.\n        .replace(/\\\\/g, '/')\n\n      // Verify that the relative import is relative to the `next` package. This\n      // will catch cases where the constants at the top of the file were not\n      // updated after the file was moved.\n      if (!relative.startsWith('next/')) {\n        throw new Error(\n          `Invariant: Expected relative import to start with \"next/\", found \"${relative}\"`\n        )\n      }\n\n      return fromRequest\n        ? `from ${JSON.stringify(relative)}`\n        : `import ${JSON.stringify(relative)}`\n    }\n  )\n\n  // Verify that at least one import was replaced. It's the case today where\n  // every template file has at least one import to update, so this ensures that\n  // we don't accidentally remove the import replacement code or use the wrong\n  // template file.\n  if (count === 0) {\n    throw new Error('Invariant: Expected to replace at least one import')\n  }\n\n  const replaced = new Set<string>()\n\n  // Replace all the template variables with the actual values. If a template\n  // variable is missing, throw an error.\n  file = file.replaceAll(\n    new RegExp(\n      `${Object.keys(replacements)\n        .map((k) => `'${k}'`)\n        .join('|')}`,\n      'g'\n    ),\n    (match) => {\n      const key = JSON.parse(match.replace(/'/g, `\"`))\n\n      if (!(key in replacements)) {\n        throw new Error(`Invariant: Unexpected template variable ${key}`)\n      }\n\n      replaced.add(key)\n\n      return JSON.stringify(replacements[key])\n    }\n  )\n\n  // Check to see if there's any remaining template variables.\n  let matches = file.match(/VAR_[A-Z_]+/g)\n  if (matches) {\n    throw new Error(\n      `Invariant: Expected to replace all template variables, found ${matches.join(\n        ', '\n      )}`\n    )\n  }\n\n  // Check to see if any template variable was provided but not used.\n  if (replaced.size !== Object.keys(replacements).length) {\n    // Find the difference between the provided replacements and the replaced\n    // template variables. This will let us notify the user of any template\n    // variables that were not used but were provided.\n    const difference = Object.keys(replacements).filter(\n      (key) => !replaced.has(key)\n    )\n\n    throw new Error(\n      `Invariant: Expected to replace all template variables, missing ${difference.join(\n        ', '\n      )} in template`\n    )\n  }\n\n  // Replace the injections.\n  const injected = new Set<string>()\n  if (injections) {\n    // Track all the injections to ensure that we're not missing any.\n    file = file.replaceAll(\n      new RegExp(`// INJECT:(${Object.keys(injections).join('|')})`, 'g'),\n      (_, key) => {\n        if (!(key in injections)) {\n          throw new Error(`Invariant: Unexpected injection ${key}`)\n        }\n\n        injected.add(key)\n\n        return `const ${key} = ${injections[key]}`\n      }\n    )\n  }\n\n  // Check to see if there's any remaining injections.\n  matches = file.match(/\\/\\/ INJECT:[A-Za-z0-9_]+/g)\n  if (matches) {\n    throw new Error(\n      `Invariant: Expected to inject all injections, found ${matches.join(\n        ', '\n      )}`\n    )\n  }\n\n  // Check to see if any injection was provided but not used.\n  if (injected.size !== Object.keys(injections ?? {}).length) {\n    // Find the difference between the provided injections and the injected\n    // injections. This will let us notify the user of any injections that were\n    // not used but were provided.\n    const difference = Object.keys(injections ?? {}).filter(\n      (key) => !injected.has(key)\n    )\n\n    throw new Error(\n      `Invariant: Expected to inject all injections, missing ${difference.join(\n        ', '\n      )} in template`\n    )\n  }\n\n  // Replace the optional imports.\n  const importsAdded = new Set<string>()\n  if (imports) {\n    // Track all the imports to ensure that we're not missing any.\n    file = file.replaceAll(\n      new RegExp(\n        `// OPTIONAL_IMPORT:(\\\\* as )?(${Object.keys(imports).join('|')})`,\n        'g'\n      ),\n      (_, asNamespace = '', key) => {\n        if (!(key in imports)) {\n          throw new Error(`Invariant: Unexpected optional import ${key}`)\n        }\n\n        importsAdded.add(key)\n\n        if (imports[key]) {\n          return `import ${asNamespace}${key} from ${JSON.stringify(\n            imports[key]\n          )}`\n        } else {\n          return `const ${key} = null`\n        }\n      }\n    )\n  }\n\n  // Check to see if there's any remaining imports.\n  matches = file.match(/\\/\\/ OPTIONAL_IMPORT:(\\* as )?[A-Za-z0-9_]+/g)\n  if (matches) {\n    throw new Error(\n      `Invariant: Expected to inject all imports, found ${matches.join(', ')}`\n    )\n  }\n\n  // Check to see if any import was provided but not used.\n  if (importsAdded.size !== Object.keys(imports ?? {}).length) {\n    // Find the difference between the provided imports and the injected\n    // imports. This will let us notify the user of any imports that were\n    // not used but were provided.\n    const difference = Object.keys(imports ?? {}).filter(\n      (key) => !importsAdded.has(key)\n    )\n\n    throw new Error(\n      `Invariant: Expected to inject all imports, missing ${difference.join(\n        ', '\n      )} in template`\n    )\n  }\n\n  return 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