All files / lib/internal/modules/esm get_format.js

93.98% Statements 78/83
76.92% Branches 20/26
100% Functions 1/1
93.98% Lines 78/83

Press n or j to go to the next uncovered block, b, p or k for the previous block.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 136x 745x 745x 212x 212x 533x 745x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 744x 503x 503x 503x 174x 503x 329x 329x 503x 6x         6x 6x 6x 6x 503x 503x   745x 136x 136x 136x 136x 136x 136x  
'use strict';
const {
  RegExpPrototypeExec,
  StringPrototypeStartsWith,
} = primordials;
const { extname } = require('path');
const { getOptionValue } = require('internal/options');
 
const experimentalJsonModules = getOptionValue('--experimental-json-modules');
const experimentalSpecifierResolution =
  getOptionValue('--experimental-specifier-resolution');
const experimentalWasmModules = getOptionValue('--experimental-wasm-modules');
const { getPackageType } = require('internal/modules/esm/resolve');
const { URL, fileURLToPath } = require('internal/url');
const { ERR_UNKNOWN_FILE_EXTENSION } = require('internal/errors').codes;
 
const extensionFormatMap = {
  '__proto__': null,
  '.cjs': 'commonjs',
  '.js': 'module',
  '.mjs': 'module'
};
 
const legacyExtensionFormatMap = {
  '__proto__': null,
  '.cjs': 'commonjs',
  '.js': 'commonjs',
  '.json': 'commonjs',
  '.mjs': 'module',
  '.node': 'commonjs'
};
 
if (experimentalWasmModules)
  extensionFormatMap['.wasm'] = legacyExtensionFormatMap['.wasm'] = 'wasm';
 
if (experimentalJsonModules)
  extensionFormatMap['.json'] = legacyExtensionFormatMap['.json'] = 'json';
 
function defaultGetFormat(url, context, defaultGetFormatUnused) {
  if (StringPrototypeStartsWith(url, 'node:')) {
    return { format: 'builtin' };
  }
  const parsed = new URL(url);
  if (parsed.protocol === 'data:') {
    const { 1: mime } = RegExpPrototypeExec(
      /^([^/]+\/[^;,]+)(?:[^,]*?)(;base64)?,/,
      parsed.pathname,
    ) || [ , null ];
    const format = ({
      '__proto__': null,
      'text/javascript': 'module',
      'application/json': experimentalJsonModules ? 'json' : null,
      'application/wasm': experimentalWasmModules ? 'wasm' : null
    })[mime] || null;
    return { format };
  } else if (parsed.protocol === 'file:') {
    const ext = extname(parsed.pathname);
    let format;
    if (ext === '.js') {
      format = getPackageType(parsed.href) === 'module' ? 'module' : 'commonjs';
    } else {
      format = extensionFormatMap[ext];
    }
    if (!format) {
      if (experimentalSpecifierResolution === 'node') {
        process.emitWarning(
          'The Node.js specifier resolution in ESM is experimental.',
          'ExperimentalWarning');
        format = legacyExtensionFormatMap[ext];
      } else {
        throw new ERR_UNKNOWN_FILE_EXTENSION(ext, fileURLToPath(url));
      }
    }
    return { format: format || null };
  }
  return { format: null };
}
 
module.exports = {
  defaultGetFormat,
  extensionFormatMap,
  legacyExtensionFormatMap,
};