Function stringifyWithFunctions

src/jsifier.mjs:83–114

(obj)

// JSON.stringify will completely omit function objects.  This function is
// similar but preserves functions.
function stringifyWithFunctions(obj) {
  if (typeof obj == 'function') return obj.toString();
  if (obj === null || typeof obj != 'object') return JSON.stringify(obj);
  if (Array.isArray(obj)) {
    return '[' + obj.map(stringifyWithFunctions).join(',') + ']';
  }

  // preserve the type of the object if it is one of [Map, Set, WeakMap, WeakSet].
  const builtinContainers = runInMacroContext('[Map, Set, WeakMap, WeakSet]', {
    filename: '<internal>',
  });
  for (const container of builtinContainers) {
    if (obj instanceof container) {
      const className = container.name;
      assert(!obj.size, `cannot stringify ${className} with data`);
      return `new ${className}`;
    }
  }

  var rtn = '{\n';
  for (const [key, value] of Object.entries(obj)) {
    var str = stringifyWithFunctions(value);
    // Handle JS method syntax where the function property starts with its own
    // name. e.g.  `foo(a) {}` (or `async foo(a) {}`)
    if (typeof value === 'function' && (str.startsWith(key) || str.startsWith('async ' + key))) {
      rtn += str + ',\n';
    } else {
      rtn += `${escapeJSONKey(key)}:${str},\n`;
    }
  }
  return rtn + '}';
}

function isDefined(symName) {
  if (WASM_EXPORTS.has(symName) || SIDE_MODULE_EXPORTS.has(symName)) {