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// Flags: --expose_internals
'use strict';
const common = require('../common');
const assert = require('assert');
const internalUtil = require('internal/util');
const binding = process.binding('util');
const spawnSync = require('child_process').spawnSync;
const path = require('path');
const kArrowMessagePrivateSymbolIndex = binding['arrow_message_private_symbol'];
const kDecoratedPrivateSymbolIndex = binding['decorated_private_symbol'];
assert.doesNotThrow(function() {
internalUtil.decorateErrorStack();
internalUtil.decorateErrorStack(null);
internalUtil.decorateErrorStack(1);
internalUtil.decorateErrorStack(true);
});
// Verify that a stack property is not added to non-Errors
const obj = {};
internalUtil.decorateErrorStack(obj);
assert.strictEqual(obj.stack, undefined);
// Verify that the stack is decorated when possible
function checkStack(stack) {
const matches = stack.match(/var foo bar;/g);
assert.strictEqual(Array.isArray(matches), true);
assert.strictEqual(matches.length, 1);
}
let err;
const badSyntaxPath =
path.join(common.fixturesDir, '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
internalUtil.decorateErrorStack(err);
internalUtil.decorateErrorStack(err);
checkStack(err.stack);
// Verify that the stack is only decorated once for uncaught exceptions
const args = [
'-e',
`require('${badSyntaxPath}')`
];
const result = spawnSync(process.argv[0], args, { encoding: 'utf8' });
checkStack(result.stderr);
// Verify that the stack is unchanged when there is no arrow message
err = new Error('foo');
let originalStack = err.stack;
internalUtil.decorateErrorStack(err);
assert.strictEqual(originalStack, err.stack);
// Verify that the arrow message is added to the start of the stack when it
// exists
const arrowMessage = 'arrow_message';
err = new Error('foo');
originalStack = err.stack;
internalUtil.setHiddenValue(err, kArrowMessagePrivateSymbolIndex, arrowMessage);
internalUtil.decorateErrorStack(err);
assert.strictEqual(err.stack, `${arrowMessage}${originalStack}`);
assert.strictEqual(internalUtil
.getHiddenValue(err, kDecoratedPrivateSymbolIndex), true);