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process: cast promise rejection reason to string
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The unhandled promise rejection warning uses a template literal and
prints the reason a promise was rejected. If rejecting with a symbol,
the symbol failed to convert to a string and the process crashed. Now,
symbols are casted to strings and the process does not crash.

Fixes: #11637
PR-URL: #11640
Reviewed-By: Anna Henningsen <anna@addaleax.net>
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apexskier authored and addaleax committed Apr 29, 2017
1 parent 74f61e8 commit a3132b0
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Showing 2 changed files with 19 additions and 1 deletion.
2 changes: 1 addition & 1 deletion lib/internal/process/promises.js
Original file line number Diff line number Diff line change
Expand Up @@ -57,7 +57,7 @@ function setupPromises(scheduleMicrotasks) {

function emitWarning(uid, reason) {
const warning = new Error('Unhandled promise rejection ' +
`(rejection id: ${uid}): ${reason}`);
`(rejection id: ${uid}): ${String(reason)}`);
warning.name = 'UnhandledPromiseRejectionWarning';
warning.id = uid;
if (reason instanceof Error) {
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18 changes: 18 additions & 0 deletions test/parallel/test-promises-unhandled-symbol-rejections.js
Original file line number Diff line number Diff line change
@@ -0,0 +1,18 @@
'use strict';
const common = require('../common');

const expectedDeprecationWarning = 'Unhandled promise rejections are ' +
'deprecated. In the future, promise ' +
'rejections that are not handled will ' +
'terminate the Node.js process with a ' +
'non-zero exit code.';
const expectedPromiseWarning = 'Unhandled promise rejection (rejection id: ' +
'1): Symbol()';

common.expectWarning({
DeprecationWarning: expectedDeprecationWarning,
UnhandledPromiseRejectionWarning: expectedPromiseWarning,
});

// ensure this doesn't crash
Promise.reject(Symbol());

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