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module: only try to enrich CJS syntax errors
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It is guaranteed that V8 throws a syntax error when `import` or `export`
is used outside of ESM.

Fixes: #35687

PR-URL: #35691
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Guy Bedford <guybedford@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
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targos authored and nodejs-github-bot committed Oct 19, 2020
1 parent 5b2c263 commit 11f1ad9
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5 changes: 5 additions & 0 deletions lib/internal/modules/esm/translators.js
Expand Up @@ -5,6 +5,7 @@
const {
Boolean,
JSONParse,
ObjectGetPrototypeOf,
ObjectPrototypeHasOwnProperty,
ObjectKeys,
PromisePrototypeCatch,
Expand All @@ -15,6 +16,7 @@ const {
StringPrototypeReplace,
StringPrototypeSplit,
StringPrototypeStartsWith,
SyntaxErrorPrototype,
} = primordials;

let _TYPES = null;
Expand Down Expand Up @@ -147,6 +149,9 @@ translators.set('module', async function moduleStrategy(url) {
});

function enrichCJSError(err) {
if (err == null || ObjectGetPrototypeOf(err) !== SyntaxErrorPrototype) {
return;
}
const stack = StringPrototypeSplit(err.stack, '\n');
/*
* The regular expression below targets the most common import statement
Expand Down
56 changes: 56 additions & 0 deletions test/es-module/test-esm-cjs-load-error-note.mjs
Expand Up @@ -10,6 +10,10 @@ const Import2 = fixtures.path('/es-modules/es-note-promiserej-import-2.cjs');
const Import3 = fixtures.path('/es-modules/es-note-unexpected-import-3.cjs');
const Import4 = fixtures.path('/es-modules/es-note-unexpected-import-4.cjs');
const Import5 = fixtures.path('/es-modules/es-note-unexpected-import-5.cjs');
const Error1 = fixtures.path('/es-modules/es-note-error-1.mjs');
const Error2 = fixtures.path('/es-modules/es-note-error-2.mjs');
const Error3 = fixtures.path('/es-modules/es-note-error-3.mjs');
const Error4 = fixtures.path('/es-modules/es-note-error-4.mjs');

// Expect note to be included in the error output
const expectedNote = 'To load an ES module, ' +
Expand Down Expand Up @@ -105,3 +109,55 @@ pImport5.on('close', mustCall((code) => {
assert.ok(!pImport5Stderr.includes(expectedNote),
`${expectedNote} must not be included in ${pImport5Stderr}`);
}));

const pError1 = spawn(process.execPath, [Error1]);
let pError1Stderr = '';
pError1.stderr.setEncoding('utf8');
pError1.stderr.on('data', (data) => {
pError1Stderr += data;
});
pError1.on('close', mustCall((code) => {
assert.strictEqual(code, expectedCode);
assert.ok(pError1Stderr.includes('Error: some error'));
assert.ok(!pError1Stderr.includes(expectedNote),
`${expectedNote} must not be included in ${pError1Stderr}`);
}));

const pError2 = spawn(process.execPath, [Error2]);
let pError2Stderr = '';
pError2.stderr.setEncoding('utf8');
pError2.stderr.on('data', (data) => {
pError2Stderr += data;
});
pError2.on('close', mustCall((code) => {
assert.strictEqual(code, expectedCode);
assert.ok(pError2Stderr.includes('string'));
assert.ok(!pError2Stderr.includes(expectedNote),
`${expectedNote} must not be included in ${pError2Stderr}`);
}));

const pError3 = spawn(process.execPath, [Error3]);
let pError3Stderr = '';
pError3.stderr.setEncoding('utf8');
pError3.stderr.on('data', (data) => {
pError3Stderr += data;
});
pError3.on('close', mustCall((code) => {
assert.strictEqual(code, expectedCode);
assert.ok(pError3Stderr.includes('null'));
assert.ok(!pError3Stderr.includes(expectedNote),
`${expectedNote} must not be included in ${pError3Stderr}`);
}));

const pError4 = spawn(process.execPath, [Error4]);
let pError4Stderr = '';
pError4.stderr.setEncoding('utf8');
pError4.stderr.on('data', (data) => {
pError4Stderr += data;
});
pError4.on('close', mustCall((code) => {
assert.strictEqual(code, expectedCode);
assert.ok(pError4Stderr.includes('undefined'));
assert.ok(!pError4Stderr.includes(expectedNote),
`${expectedNote} must not be included in ${pError4Stderr}`);
}));
1 change: 1 addition & 0 deletions test/fixtures/es-modules/es-note-error-1.cjs
@@ -0,0 +1 @@
throw new Error('some error');
1 change: 1 addition & 0 deletions test/fixtures/es-modules/es-note-error-1.mjs
@@ -0,0 +1 @@
import './es-note-error-1.cjs';
1 change: 1 addition & 0 deletions test/fixtures/es-modules/es-note-error-2.cjs
@@ -0,0 +1 @@
throw 'string';
1 change: 1 addition & 0 deletions test/fixtures/es-modules/es-note-error-2.mjs
@@ -0,0 +1 @@
import './es-note-error-2.cjs';
1 change: 1 addition & 0 deletions test/fixtures/es-modules/es-note-error-3.cjs
@@ -0,0 +1 @@
throw null;
1 change: 1 addition & 0 deletions test/fixtures/es-modules/es-note-error-3.mjs
@@ -0,0 +1 @@
import './es-note-error-3.cjs';
1 change: 1 addition & 0 deletions test/fixtures/es-modules/es-note-error-4.cjs
@@ -0,0 +1 @@
throw undefined;
1 change: 1 addition & 0 deletions test/fixtures/es-modules/es-note-error-4.mjs
@@ -0,0 +1 @@
import './es-note-error-4.cjs';

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