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// Flags: --expose_internals
'use strict';
require('../common');
const fixtures = require('../common/fixtures');
const assert = require('assert');
const internalUtil = require('internal/util');
const { internalBinding } = require('internal/test/binding');
const binding = internalBinding('util');
const spawnSync = require('child_process').spawnSync;
const kArrowMessagePrivateSymbolIndex = binding.arrow_message_private_symbol;
const kDecoratedPrivateSymbolIndex = binding.decorated_private_symbol;
const decorateErrorStack = internalUtil.decorateErrorStack;
// Verify that decorateErrorStack does not throw with non-objects.
decorateErrorStack();
decorateErrorStack(null);
decorateErrorStack(1);
decorateErrorStack(true);
// Verify that a stack property is not added to non-Errors.
const obj = {};
decorateErrorStack(obj);
assert.strictEqual(obj.stack, undefined);
// Verify that the stack is decorated when possible.
function checkStack(stack) {
// Matching only on a minimal piece of the stack because the string will vary
// greatly depending on the JavaScript engine. V8 includes `;` because it
// displays the line of code (`var foo bar;`) that is causing a problem.
// ChakraCore does not display the line of code but includes `;` in the phrase
// `Expected ';' `.
assert.ok(/;/g.test(stack));
// Test that it's a multiline string.
assert.ok(/\n/g.test(stack));
}
let err;
const badSyntaxPath =
fixtures.path('syntax', 'bad_syntax').replace(/\\/g, '\\\\');
try {
require(badSyntaxPath);
} catch (e) {
err = e;
}
assert(typeof err, 'object');
checkStack(err.stack);
// Verify that the stack is only decorated once.
decorateErrorStack(err);
decorateErrorStack(err);
checkStack(err.stack);
// Verify that the stack is only decorated once for uncaught exceptions.
const args = [
'-e',
`require('${badSyntaxPath}')`
];
const result = spawnSync(process.argv[0], args, { encoding: 'utf8' });
checkStack(result.stderr);
// Verify that the stack is unchanged when there is no arrow message.
err = new Error('foo');
let originalStack = err.stack;
decorateErrorStack(err);
assert.strictEqual(originalStack, err.stack);
// Verify that the arrow message is added to the start of the stack when it
// exists.
const arrowMessage = 'arrow_message';
err = new Error('foo');
originalStack = err.stack;
binding.setHiddenValue(err, kArrowMessagePrivateSymbolIndex, arrowMessage);
decorateErrorStack(err);
assert.strictEqual(err.stack, `${arrowMessage}${originalStack}`);
assert.strictEqual(
binding.getHiddenValue(err, kDecoratedPrivateSymbolIndex), true);
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