|
| 1 | +// Flags: --experimental-vm-modules |
| 2 | + |
| 3 | +'use strict'; |
| 4 | + |
| 5 | +const common = require('../common'); |
| 6 | +const vm = require('vm'); |
| 7 | +const assert = require('assert'); |
| 8 | + |
| 9 | +// This test verifies that a module can be returned multiple |
| 10 | +// times in the linker function in `module.link(linker)`. |
| 11 | +// `module.link(linker)` should handle the race condition of |
| 12 | +// `module.status` when the linker function is asynchronous. |
| 13 | + |
| 14 | +// Regression of https://github.com/nodejs/node/issues/59480 |
| 15 | + |
| 16 | +const sources = { |
| 17 | + './index.js': ` |
| 18 | + import foo from "./foo.js"; |
| 19 | + import shared from "./shared.js"; |
| 20 | + export default { |
| 21 | + foo, |
| 22 | + shared |
| 23 | + }; |
| 24 | + `, |
| 25 | + './foo.js': ` |
| 26 | + import shared from "./shared.js"; |
| 27 | + export default { |
| 28 | + name: "foo" |
| 29 | + }; |
| 30 | + `, |
| 31 | + './shared.js': ` |
| 32 | + export default { |
| 33 | + name: "shared", |
| 34 | + }; |
| 35 | + `, |
| 36 | +}; |
| 37 | + |
| 38 | +const moduleCache = new Map(); |
| 39 | + |
| 40 | +function getModuleInstance(identifier) { |
| 41 | + let module = moduleCache.get(identifier); |
| 42 | + |
| 43 | + if (!module) { |
| 44 | + module = new vm.SourceTextModule(sources[identifier], { |
| 45 | + identifier, |
| 46 | + }); |
| 47 | + moduleCache.set(identifier, module); |
| 48 | + } |
| 49 | + |
| 50 | + return module; |
| 51 | +} |
| 52 | + |
| 53 | +async function esmImport(identifier) { |
| 54 | + const module = getModuleInstance(identifier); |
| 55 | + const requests = []; |
| 56 | + |
| 57 | + await module.link(async (specifier, referrer) => { |
| 58 | + requests.push([specifier, referrer.identifier]); |
| 59 | + // Use `Promise.resolve` to defer a tick to create a race condition on |
| 60 | + // `module.status` when a module is being imported several times. |
| 61 | + return Promise.resolve(getModuleInstance(specifier)); |
| 62 | + }); |
| 63 | + |
| 64 | + await module.evaluate(); |
| 65 | + return [module.namespace, requests]; |
| 66 | +} |
| 67 | + |
| 68 | +async function test() { |
| 69 | + const { 0: mod, 1: requests } = await esmImport('./index.js'); |
| 70 | + assert.strictEqual(mod.default.foo.name, 'foo'); |
| 71 | + assert.strictEqual(mod.default.shared.name, 'shared'); |
| 72 | + |
| 73 | + // Assert that there is no duplicated requests. |
| 74 | + assert.deepStrictEqual(requests, [ |
| 75 | + // [specifier, referrer] |
| 76 | + ['./foo.js', './index.js'], |
| 77 | + ['./shared.js', './index.js'], |
| 78 | + ['./shared.js', './foo.js'], |
| 79 | + ]); |
| 80 | +} |
| 81 | + |
| 82 | +test().then(common.mustCall()); |