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

78.46% Statements 51/65
75% Branches 9/12
50% Functions 1/2
78.46% Lines 51/65

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 66135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x     135x 89x 89x 89x 89x 89x 89x 89x 89x 89x 78x 89x 135x 135x                         135x 135x 135x 135x 135x 135x 135x  
'use strict';
 
const {
  RegExpPrototypeTest,
} = primordials;
const { getOptionValue } = require('internal/options');
 
 
const experimentalWasmModules = getOptionValue('--experimental-wasm-modules');
const experimentalSpecifierResolution =
  getOptionValue('--experimental-specifier-resolution');
 
const extensionFormatMap = {
  '__proto__': null,
  '.cjs': 'commonjs',
  '.js': 'module',
  '.json': 'json',
  '.mjs': 'module',
};
 
const legacyExtensionFormatMap = {
  '__proto__': null,
  '.cjs': 'commonjs',
  '.js': 'commonjs',
  '.json': 'commonjs',
  '.mjs': 'module',
  '.node': 'commonjs',
};
 
if (experimentalWasmModules) {
  extensionFormatMap['.wasm'] = legacyExtensionFormatMap['.wasm'] = 'wasm';
}
 
function mimeToFormat(mime) {
  if (
    RegExpPrototypeTest(
      /\s*(text|application)\/javascript\s*(;\s*charset=utf-?8\s*)?/i,
      mime
    )
  ) return 'module';
  if (mime === 'application/json') return 'json';
  if (experimentalWasmModules && mime === 'application/wasm') return 'wasm';
  return null;
}
 
let experimentalSpecifierResolutionWarned = false;
function getLegacyExtensionFormat(ext) {
  if (
    experimentalSpecifierResolution === 'node' &&
    !experimentalSpecifierResolutionWarned
  ) {
    process.emitWarning(
      'The Node.js specifier resolution in ESM is experimental.',
      'ExperimentalWarning');
    experimentalSpecifierResolutionWarned = true;
  }
  return legacyExtensionFormatMap[ext];
}
 
module.exports = {
  extensionFormatMap,
  getLegacyExtensionFormat,
  legacyExtensionFormatMap,
  mimeToFormat,
};