module: fix dynamic import from eval

This allows dynamic import to work from CLI `--eval` with or without `--input-type=module`. Fixes: #30591 PR-URL: #30624 Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Yorkie Liu <[email protected]> Reviewed-By: Ben Coe <[email protected]>
nodejs · Feb 6, 2020 · cad5c2b · cad5c2b
1 parent 77c69f5
commit cad5c2b
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Showing 3 changed files with 44 additions and 4 deletions.
diff --git a/lib/internal/modules/esm/loader.js b/lib/internal/modules/esm/loader.js
@@ -21,7 +21,6 @@ const defaultResolve = require('internal/modules/esm/default_resolve');
 const createDynamicModule = require(
   'internal/modules/esm/create_dynamic_module');
 const { translators } = require('internal/modules/esm/translators');
-const { ModuleWrap } = internalBinding('module_wrap');
 const { getOptionValue } = require('internal/options');
 
 const debug = require('internal/util/debuglog').debuglog('esm');
@@ -118,7 +117,17 @@ class Loader {
     source,
     url = pathToFileURL(`${process.cwd()}/[eval${++this.evalIndex}]`).href
   ) {
-    const evalInstance = (url) => new ModuleWrap(url, undefined, source, 0, 0);
+    const evalInstance = (url) => {
+      const { ModuleWrap, callbackMap } = internalBinding('module_wrap');
+      const module = new ModuleWrap(url, undefined, source, 0, 0);
+      callbackMap.set(module, {
+        importModuleDynamically: (specifier, { url }) => {
+          return this.import(specifier, url);
+        }
+      });
+
+      return module;
+    };
     const job = new ModuleJob(this, url, evalInstance, false, false);
     this.moduleMap.set(url, job);
     const { module, result } = await job.run();

diff --git a/lib/internal/process/execution.js b/lib/internal/process/execution.js
@@ -55,27 +55,38 @@ function evalModule(source, print) {
 function evalScript(name, body, breakFirstLine, print) {
   const CJSModule = require('internal/modules/cjs/loader').Module;
   const { kVmBreakFirstLineSymbol } = require('internal/util');
+  const { pathToFileURL } = require('url');
 
   const cwd = tryGetCwd();
   const origModule = global.module;  // Set e.g. when called from the REPL.
 
   const module = new CJSModule(name);
   module.filename = path.join(cwd, name);
   module.paths = CJSModule._nodeModulePaths(cwd);
+
   global.kVmBreakFirstLineSymbol = kVmBreakFirstLineSymbol;
+  global.asyncESM = require('internal/process/esm_loader');
+
+  const baseUrl = pathToFileURL(module.filename).href;
+
   const script = `
     global.__filename = ${JSON.stringify(name)};
     global.exports = exports;
     global.module = module;
     global.__dirname = __dirname;
     global.require = require;
-    const { kVmBreakFirstLineSymbol } = global;
+    const { kVmBreakFirstLineSymbol, asyncESM } = global;
     delete global.kVmBreakFirstLineSymbol;
+    delete global.asyncESM;
     return require("vm").runInThisContext(
       ${JSON.stringify(body)}, {
         filename: ${JSON.stringify(name)},
         displayErrors: true,
-        [kVmBreakFirstLineSymbol]: ${!!breakFirstLine}
+        [kVmBreakFirstLineSymbol]: ${!!breakFirstLine},
+        async importModuleDynamically (specifier) {
+          const loader = await asyncESM.ESMLoader;
+          return loader.import(specifier, ${JSON.stringify(baseUrl)});
+        }
       });\n`;
   const result = module._compile(script, `${name}-wrapper`);
   if (print) {

diff --git a/test/parallel/test-cli-eval.js b/test/parallel/test-cli-eval.js
@@ -283,3 +283,23 @@ child.exec(
     assert.ifError(err);
     assert.strictEqual(stdout, '.mjs file\n');
   }));
+
+
+// Assert that packages can be dynamic imported initial cwd-relative with --eval
+child.exec(
+  `${nodejs} ${execOptions} ` +
+  '--eval "process.chdir(\'..\');' +
+          'import(\'./test/fixtures/es-modules/mjs-file.mjs\')"',
+  common.mustCall((err, stdout) => {
+    assert.ifError(err);
+    assert.strictEqual(stdout, '.mjs file\n');
+  }));
+
+child.exec(
+  `${nodejs} ${execOptions} ` +
+  '--eval "process.chdir(\'..\');' +
+          'import(\'./test/fixtures/es-modules/mjs-file.mjs\')"',
+  common.mustCall((err, stdout) => {
+    assert.ifError(err);
+    assert.strictEqual(stdout, '.mjs file\n');
+  }));