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  1. 'use strict';
  2. var getBuiltIn = require('../internals/get-built-in');
  3. var call = require('../internals/function-call');
  4. var uncurryThis = require('../internals/function-uncurry-this');
  5. var bind = require('../internals/function-bind-context');
  6. var anObject = require('../internals/an-object');
  7. var aCallable = require('../internals/a-callable');
  8. var isNullOrUndefined = require('../internals/is-null-or-undefined');
  9. var getMethod = require('../internals/get-method');
  10. var wellKnownSymbol = require('../internals/well-known-symbol');
  11. var ASYNC_DISPOSE = wellKnownSymbol('asyncDispose');
  12. var DISPOSE = wellKnownSymbol('dispose');
  13. var push = uncurryThis([].push);
  14. // `GetDisposeMethod` abstract operation
  15. // https://tc39.es/proposal-explicit-resource-management/#sec-getdisposemethod
  16. var getDisposeMethod = function (V, hint) {
  17. if (hint === 'async-dispose') {
  18. var method = getMethod(V, ASYNC_DISPOSE);
  19. if (method !== undefined) return method;
  20. method = getMethod(V, DISPOSE);
  21. if (method === undefined) return method;
  22. return function () {
  23. var O = this;
  24. var Promise = getBuiltIn('Promise');
  25. return new Promise(function (resolve) {
  26. call(method, O);
  27. resolve(undefined);
  28. });
  29. };
  30. } return getMethod(V, DISPOSE);
  31. };
  32. // `CreateDisposableResource` abstract operation
  33. // https://tc39.es/proposal-explicit-resource-management/#sec-createdisposableresource
  34. var createDisposableResource = function (V, hint, method) {
  35. if (arguments.length < 3 && !isNullOrUndefined(V)) {
  36. method = aCallable(getDisposeMethod(anObject(V), hint));
  37. }
  38. return method === undefined ? function () {
  39. return undefined;
  40. } : bind(method, V);
  41. };
  42. // `AddDisposableResource` abstract operation
  43. // https://tc39.es/proposal-explicit-resource-management/#sec-adddisposableresource
  44. module.exports = function (disposable, V, hint, method) {
  45. var resource;
  46. if (arguments.length < 4) {
  47. // When `V`` is either `null` or `undefined` and hint is `async-dispose`,
  48. // we record that the resource was evaluated to ensure we will still perform an `Await` when resources are later disposed.
  49. if (isNullOrUndefined(V) && hint === 'sync-dispose') return;
  50. resource = createDisposableResource(V, hint);
  51. } else {
  52. resource = createDisposableResource(undefined, hint, method);
  53. }
  54. push(disposable.stack, resource);
  55. };