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test-util-inspect.js
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test-util-inspect.js
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// Flags: --expose-internals
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
'use strict';
const common = require('../common');
const assert = require('assert');
const { internalBinding } = require('internal/test/binding');
const JSStream = internalBinding('js_stream').JSStream;
const util = require('util');
const vm = require('vm');
const v8 = require('v8');
const { previewEntries } = internalBinding('util');
const { inspect } = util;
const { MessageChannel } = require('worker_threads');
assert.strictEqual(util.inspect(1), '1');
assert.strictEqual(util.inspect(false), 'false');
assert.strictEqual(util.inspect(''), "''");
assert.strictEqual(util.inspect('hello'), "'hello'");
assert.strictEqual(util.inspect(function abc() {}), '[Function: abc]');
assert.strictEqual(util.inspect(() => {}), '[Function (anonymous)]');
assert.strictEqual(
util.inspect(async function() {}),
'[AsyncFunction (anonymous)]'
);
assert.strictEqual(util.inspect(async () => {}), '[AsyncFunction (anonymous)]');
// Special function inspection.
{
const fn = (() => function*() {})();
assert.strictEqual(
util.inspect(fn),
'[GeneratorFunction (anonymous)]'
);
assert.strictEqual(
util.inspect(async function* abc() {}),
'[AsyncGeneratorFunction: abc]'
);
Object.setPrototypeOf(fn, Object.getPrototypeOf(async () => {}));
assert.strictEqual(
util.inspect(fn),
'[GeneratorFunction (anonymous)] AsyncFunction'
);
Object.defineProperty(fn, 'name', { value: 5, configurable: true });
assert.strictEqual(
util.inspect(fn),
'[GeneratorFunction: 5] AsyncFunction'
);
Object.defineProperty(fn, Symbol.toStringTag, {
value: 'Foobar',
configurable: true
});
assert.strictEqual(
util.inspect({ ['5']: fn }),
"{ '5': [GeneratorFunction: 5] AsyncFunction [Foobar] }"
);
Object.defineProperty(fn, 'name', { value: '5', configurable: true });
Object.setPrototypeOf(fn, null);
assert.strictEqual(
util.inspect(fn),
'[GeneratorFunction (null prototype): 5] [Foobar]'
);
assert.strictEqual(
util.inspect({ ['5']: fn }),
"{ '5': [GeneratorFunction (null prototype): 5] [Foobar] }"
);
}
assert.strictEqual(util.inspect(undefined), 'undefined');
assert.strictEqual(util.inspect(null), 'null');
assert.strictEqual(util.inspect(/foo(bar\n)?/gi), '/foo(bar\\n)?/gi');
assert.strictEqual(
util.inspect(new Date('Sun, 14 Feb 2010 11:48:40 GMT')),
new Date('2010-02-14T12:48:40+01:00').toISOString()
);
assert.strictEqual(util.inspect(new Date('')), (new Date('')).toString());
assert.strictEqual(util.inspect('\n\x01'), "'\\n\\x01'");
assert.strictEqual(
util.inspect(`${Array(75).fill(1)}'\n\x1d\n\x03\x85\x7f\x7e\x9f\xa0`),
// eslint-disable-next-line no-irregular-whitespace
`"${Array(75).fill(1)}'\\n" +\n '\\x1D\\n' +\n '\\x03\\x85\\x7F~\\x9FΒ '`
);
assert.strictEqual(util.inspect([]), '[]');
assert.strictEqual(util.inspect(Object.create([])), 'Array {}');
assert.strictEqual(util.inspect([1, 2]), '[ 1, 2 ]');
assert.strictEqual(util.inspect([1, [2, 3]]), '[ 1, [ 2, 3 ] ]');
assert.strictEqual(util.inspect({}), '{}');
assert.strictEqual(util.inspect({ a: 1 }), '{ a: 1 }');
assert.strictEqual(util.inspect({ a: function() {} }), '{ a: [Function: a] }');
assert.strictEqual(util.inspect({ a: () => {} }), '{ a: [Function: a] }');
// eslint-disable-next-line func-name-matching
assert.strictEqual(util.inspect({ a: async function abc() {} }),
'{ a: [AsyncFunction: abc] }');
assert.strictEqual(util.inspect({ a: async () => {} }),
'{ a: [AsyncFunction: a] }');
assert.strictEqual(util.inspect({ a: function*() {} }),
'{ a: [GeneratorFunction: a] }');
assert.strictEqual(util.inspect({ a: 1, b: 2 }), '{ a: 1, b: 2 }');
assert.strictEqual(util.inspect({ 'a': {} }), '{ a: {} }');
assert.strictEqual(util.inspect({ 'a': { 'b': 2 } }), '{ a: { b: 2 } }');
assert.strictEqual(util.inspect({ 'a': { 'b': { 'c': { 'd': 2 } } } }),
'{ a: { b: { c: [Object] } } }');
assert.strictEqual(
util.inspect({ 'a': { 'b': { 'c': { 'd': 2 } } } }, false, null),
'{\n a: { b: { c: { d: 2 } } }\n}');
assert.strictEqual(util.inspect([1, 2, 3], true), '[ 1, 2, 3, [length]: 3 ]');
assert.strictEqual(util.inspect({ 'a': { 'b': { 'c': 2 } } }, false, 0),
'{ a: [Object] }');
assert.strictEqual(util.inspect({ 'a': { 'b': { 'c': 2 } } }, false, 1),
'{ a: { b: [Object] } }');
assert.strictEqual(util.inspect({ 'a': { 'b': ['c'] } }, false, 1),
'{ a: { b: [Array] } }');
assert.strictEqual(util.inspect(new Uint8Array(0)), 'Uint8Array(0) []');
assert(inspect(new Uint8Array(0), { showHidden: true }).includes('[buffer]'));
assert.strictEqual(
util.inspect(
Object.create(
{},
{ visible: { value: 1, enumerable: true }, hidden: { value: 2 } }
)
),
'{ visible: 1 }'
);
assert.strictEqual(
util.inspect(
Object.assign(new String('hello'), { [Symbol('foo')]: 123 }),
{ showHidden: true }
),
"[String: 'hello'] { [length]: 5, [Symbol(foo)]: 123 }"
);
assert.match(util.inspect((new JSStream())._externalStream),
/^\[External: [0-9a-f]+\]$/);
{
const regexp = /regexp/;
regexp.aprop = 42;
assert.strictEqual(util.inspect({ a: regexp }, false, 0), '{ a: /regexp/ }');
}
assert.match(
util.inspect({ a: { a: { a: { a: {} } } } }, undefined, undefined, true),
/Object/
);
assert.doesNotMatch(
util.inspect({ a: { a: { a: { a: {} } } } }, undefined, null, true),
/Object/
);
{
const showHidden = true;
const ab = new Uint8Array([1, 2, 3, 4]).buffer;
const dv = new DataView(ab, 1, 2);
assert.strictEqual(
util.inspect(ab, showHidden),
'ArrayBuffer { [Uint8Contents]: <01 02 03 04>, byteLength: 4 }'
);
assert.strictEqual(util.inspect(new DataView(ab, 1, 2), showHidden),
'DataView {\n' +
' byteLength: 2,\n' +
' byteOffset: 1,\n' +
' buffer: ArrayBuffer {' +
' [Uint8Contents]: <01 02 03 04>, byteLength: 4 }\n}');
assert.strictEqual(
util.inspect(ab, showHidden),
'ArrayBuffer { [Uint8Contents]: <01 02 03 04>, byteLength: 4 }'
);
assert.strictEqual(util.inspect(dv, showHidden),
'DataView {\n' +
' byteLength: 2,\n' +
' byteOffset: 1,\n' +
' buffer: ArrayBuffer { [Uint8Contents]: ' +
'<01 02 03 04>, byteLength: 4 }\n}');
ab.x = 42;
dv.y = 1337;
assert.strictEqual(util.inspect(ab, showHidden),
'ArrayBuffer { [Uint8Contents]: <01 02 03 04>, ' +
'byteLength: 4, x: 42 }');
assert.strictEqual(util.inspect(dv, showHidden),
'DataView {\n' +
' byteLength: 2,\n' +
' byteOffset: 1,\n' +
' buffer: ArrayBuffer { [Uint8Contents]: <01 02 03 04>,' +
' byteLength: 4, x: 42 },\n' +
' y: 1337\n}');
}
{
const ab = new ArrayBuffer(42);
assert.strictEqual(ab.byteLength, 42);
new MessageChannel().port1.postMessage(ab, [ ab ]);
assert.strictEqual(ab.byteLength, 0);
assert.strictEqual(util.inspect(ab),
'ArrayBuffer { (detached), byteLength: 0 }');
}
// Truncate output for ArrayBuffers using plural or singular bytes
{
const ab = new ArrayBuffer(3);
assert.strictEqual(util.inspect(ab, { showHidden: true, maxArrayLength: 2 }),
'ArrayBuffer { [Uint8Contents]' +
': <00 00 ... 1 more byte>, byteLength: 3 }');
assert.strictEqual(util.inspect(ab, { showHidden: true, maxArrayLength: 1 }),
'ArrayBuffer { [Uint8Contents]' +
': <00 ... 2 more bytes>, byteLength: 3 }');
}
// Now do the same checks but from a different context.
{
const showHidden = false;
const ab = vm.runInNewContext('new ArrayBuffer(4)');
const dv = vm.runInNewContext('new DataView(ab, 1, 2)', { ab });
assert.strictEqual(
util.inspect(ab, showHidden),
'ArrayBuffer { [Uint8Contents]: <00 00 00 00>, byteLength: 4 }'
);
assert.strictEqual(util.inspect(new DataView(ab, 1, 2), showHidden),
'DataView {\n' +
' byteLength: 2,\n' +
' byteOffset: 1,\n' +
' buffer: ArrayBuffer { [Uint8Contents]: <00 00 00 00>,' +
' byteLength: 4 }\n}');
assert.strictEqual(
util.inspect(ab, showHidden),
'ArrayBuffer { [Uint8Contents]: <00 00 00 00>, byteLength: 4 }'
);
assert.strictEqual(util.inspect(dv, showHidden),
'DataView {\n' +
' byteLength: 2,\n' +
' byteOffset: 1,\n' +
' buffer: ArrayBuffer { [Uint8Contents]: <00 00 00 00>,' +
' byteLength: 4 }\n}');
ab.x = 42;
dv.y = 1337;
assert.strictEqual(util.inspect(ab, showHidden),
'ArrayBuffer { [Uint8Contents]: <00 00 00 00>, ' +
'byteLength: 4, x: 42 }');
assert.strictEqual(util.inspect(dv, showHidden),
'DataView {\n' +
' byteLength: 2,\n' +
' byteOffset: 1,\n' +
' buffer: ArrayBuffer { [Uint8Contents]: <00 00 00 00>,' +
' byteLength: 4, x: 42 },\n' +
' y: 1337\n}');
}
[ Float32Array,
Float64Array,
Int16Array,
Int32Array,
Int8Array,
Uint16Array,
Uint32Array,
Uint8Array,
Uint8ClampedArray ].forEach((constructor) => {
const length = 2;
const byteLength = length * constructor.BYTES_PER_ELEMENT;
const array = new constructor(new ArrayBuffer(byteLength), 0, length);
array[0] = 65;
array[1] = 97;
assert.strictEqual(
util.inspect(array, { showHidden: true }),
`${constructor.name}(${length}) [\n` +
' 65,\n' +
' 97,\n' +
` [BYTES_PER_ELEMENT]: ${constructor.BYTES_PER_ELEMENT},\n` +
` [length]: ${length},\n` +
` [byteLength]: ${byteLength},\n` +
' [byteOffset]: 0,\n' +
` [buffer]: ArrayBuffer { byteLength: ${byteLength} }\n]`);
assert.strictEqual(
util.inspect(array, false),
`${constructor.name}(${length}) [ 65, 97 ]`
);
});
// Now check that declaring a TypedArray in a different context works the same.
[ Float32Array,
Float64Array,
Int16Array,
Int32Array,
Int8Array,
Uint16Array,
Uint32Array,
Uint8Array,
Uint8ClampedArray ].forEach((constructor) => {
const length = 2;
const byteLength = length * constructor.BYTES_PER_ELEMENT;
const array = vm.runInNewContext(
'new constructor(new ArrayBuffer(byteLength), 0, length)',
{ constructor, byteLength, length }
);
array[0] = 65;
array[1] = 97;
assert.strictEqual(
util.inspect(array, true),
`${constructor.name}(${length}) [\n` +
' 65,\n' +
' 97,\n' +
` [BYTES_PER_ELEMENT]: ${constructor.BYTES_PER_ELEMENT},\n` +
` [length]: ${length},\n` +
` [byteLength]: ${byteLength},\n` +
' [byteOffset]: 0,\n' +
` [buffer]: ArrayBuffer { byteLength: ${byteLength} }\n]`);
assert.strictEqual(
util.inspect(array, false),
`${constructor.name}(${length}) [ 65, 97 ]`
);
});
{
const brokenLength = new Float32Array(2);
Object.defineProperty(brokenLength, 'length', { value: -1 });
assert.strictEqual(inspect(brokenLength), 'Float32Array(2) [ 0n, 0n ]');
}
assert.strictEqual(
util.inspect(Object.create({}, {
visible: { value: 1, enumerable: true },
hidden: { value: 2 }
}), { showHidden: true }),
'{ visible: 1, [hidden]: 2 }'
);
// Objects without prototype.
assert.strictEqual(
util.inspect(Object.create(null, {
name: { value: 'Tim', enumerable: true },
hidden: { value: 'secret' }
}), { showHidden: true }),
"[Object: null prototype] { name: 'Tim', [hidden]: 'secret' }"
);
assert.strictEqual(
util.inspect(Object.create(null, {
name: { value: 'Tim', enumerable: true },
hidden: { value: 'secret' }
})),
"[Object: null prototype] { name: 'Tim' }"
);
// Dynamic properties.
{
assert.strictEqual(
util.inspect({ get readonly() { return 1; } }),
'{ readonly: [Getter] }');
assert.strictEqual(
util.inspect({ get readwrite() { return 1; }, set readwrite(val) {} }),
'{ readwrite: [Getter/Setter] }');
assert.strictEqual(
// eslint-disable-next-line accessor-pairs
util.inspect({ set writeonly(val) {} }),
'{ writeonly: [Setter] }');
const value = {};
value.a = value;
assert.strictEqual(util.inspect(value), '<ref *1> { a: [Circular *1] }');
const getterFn = {
get one() {
return null;
}
};
assert.strictEqual(
util.inspect(getterFn, { getters: true }),
'{ one: [Getter: null] }'
);
}
// Array with dynamic properties.
{
const value = [1, 2, 3];
Object.defineProperty(
value,
'growingLength',
{
enumerable: true,
get: function() { this.push(true); return this.length; }
}
);
Object.defineProperty(
value,
'-1',
{
enumerable: true,
value: -1
}
);
assert.strictEqual(util.inspect(value),
"[ 1, 2, 3, growingLength: [Getter], '-1': -1 ]");
}
// Array with inherited number properties.
{
class CustomArray extends Array {}
CustomArray.prototype[5] = 'foo';
CustomArray.prototype[49] = 'bar';
CustomArray.prototype.foo = true;
const arr = new CustomArray(50);
arr[49] = 'I win';
assert.strictEqual(
util.inspect(arr),
"CustomArray(50) [ <49 empty items>, 'I win' ]"
);
assert.strictEqual(
util.inspect(arr, { showHidden: true }),
'CustomArray(50) [\n' +
' <49 empty items>,\n' +
" 'I win',\n" +
' [length]: 50,\n' +
" '5': 'foo',\n" +
' foo: true\n' +
']'
);
}
// Array with extra properties.
{
const arr = [1, 2, 3, , ];
arr.foo = 'bar';
assert.strictEqual(util.inspect(arr),
"[ 1, 2, 3, <1 empty item>, foo: 'bar' ]");
const arr2 = [];
assert.strictEqual(util.inspect([], { showHidden: true }), '[ [length]: 0 ]');
arr2['00'] = 1;
assert.strictEqual(util.inspect(arr2), "[ '00': 1 ]");
assert.strictEqual(util.inspect(arr2, { showHidden: true }),
"[ [length]: 0, '00': 1 ]");
arr2[1] = 0;
assert.strictEqual(util.inspect(arr2), "[ <1 empty item>, 0, '00': 1 ]");
assert.strictEqual(util.inspect(arr2, { showHidden: true }),
"[ <1 empty item>, 0, [length]: 2, '00': 1 ]");
delete arr2[1];
assert.strictEqual(util.inspect(arr2), "[ <2 empty items>, '00': 1 ]");
assert.strictEqual(util.inspect(arr2, { showHidden: true }),
"[ <2 empty items>, [length]: 2, '00': 1 ]");
arr2['01'] = 2;
assert.strictEqual(util.inspect(arr2),
"[ <2 empty items>, '00': 1, '01': 2 ]");
assert.strictEqual(util.inspect(arr2, { showHidden: true }),
"[ <2 empty items>, [length]: 2, '00': 1, '01': 2 ]");
delete arr2['00'];
arr2[0] = 0;
assert.strictEqual(util.inspect(arr2),
"[ 0, <1 empty item>, '01': 2 ]");
assert.strictEqual(util.inspect(arr2, { showHidden: true }),
"[ 0, <1 empty item>, [length]: 2, '01': 2 ]");
delete arr2['01'];
arr2[2 ** 32 - 2] = 'max';
arr2[2 ** 32 - 1] = 'too far';
assert.strictEqual(
util.inspect(arr2),
"[ 0, <4294967293 empty items>, 'max', '4294967295': 'too far' ]"
);
const arr3 = [];
arr3[-1] = -1;
assert.strictEqual(util.inspect(arr3), "[ '-1': -1 ]");
}
// Indices out of bounds.
{
const arr = [];
arr[2 ** 32] = true; // Not a valid array index.
assert.strictEqual(util.inspect(arr), "[ '4294967296': true ]");
arr[0] = true;
arr[10] = true;
assert.strictEqual(util.inspect(arr),
"[ true, <9 empty items>, true, '4294967296': true ]");
arr[2 ** 32 - 2] = true;
arr[2 ** 32 - 1] = true;
arr[2 ** 32 + 1] = true;
delete arr[0];
delete arr[10];
assert.strictEqual(util.inspect(arr),
['[',
'<4294967294 empty items>,',
'true,',
"'4294967296': true,",
"'4294967295': true,",
"'4294967297': true\n]",
].join('\n '));
}
// Function with properties.
{
const value = () => {};
value.aprop = 42;
assert.strictEqual(util.inspect(value), '[Function: value] { aprop: 42 }');
}
// Anonymous function with properties.
{
const value = (() => function() {})();
value.aprop = 42;
assert.strictEqual(
util.inspect(value),
'[Function (anonymous)] { aprop: 42 }'
);
}
// Regular expressions with properties.
{
const value = /123/ig;
value.aprop = 42;
assert.strictEqual(util.inspect(value), '/123/gi { aprop: 42 }');
}
// Dates with properties.
{
const value = new Date('Sun, 14 Feb 2010 11:48:40 GMT');
value.aprop = 42;
assert.strictEqual(util.inspect(value),
'2010-02-14T11:48:40.000Z { aprop: 42 }');
}
// Test the internal isDate implementation.
{
const Date2 = vm.runInNewContext('Date');
const d = new Date2();
const orig = util.inspect(d);
Date2.prototype.foo = 'bar';
const after = util.inspect(d);
assert.strictEqual(orig, after);
}
// Test positive/negative zero.
assert.strictEqual(util.inspect(0), '0');
assert.strictEqual(util.inspect(-0), '-0');
// Edge case from check.
assert.strictEqual(util.inspect(-5e-324), '-5e-324');
// Test for sparse array.
{
const a = ['foo', 'bar', 'baz'];
assert.strictEqual(util.inspect(a), "[ 'foo', 'bar', 'baz' ]");
delete a[1];
assert.strictEqual(util.inspect(a), "[ 'foo', <1 empty item>, 'baz' ]");
assert.strictEqual(
util.inspect(a, true),
"[ 'foo', <1 empty item>, 'baz', [length]: 3 ]"
);
assert.strictEqual(util.inspect(new Array(5)), '[ <5 empty items> ]');
a[3] = 'bar';
a[100] = 'qux';
assert.strictEqual(
util.inspect(a, { breakLength: Infinity }),
"[ 'foo', <1 empty item>, 'baz', 'bar', <96 empty items>, 'qux' ]"
);
delete a[3];
assert.strictEqual(
util.inspect(a, { maxArrayLength: 4 }),
"[ 'foo', <1 empty item>, 'baz', <97 empty items>, ... 1 more item ]"
);
// test 4 special case
assert.strictEqual(util.inspect(a, {
maxArrayLength: 2
}), "[ 'foo', <1 empty item>, ... 99 more items ]");
}
// Test for Array constructor in different context.
{
const map = new Map();
map.set(1, 2);
// Passing only a single argument to indicate a set iterator.
const valsSetIterator = previewEntries(map.entries());
// Passing through true to indicate a map iterator.
const valsMapIterEntries = previewEntries(map.entries(), true);
const valsMapIterKeys = previewEntries(map.keys(), true);
assert.strictEqual(util.inspect(valsSetIterator), '[ 1, 2 ]');
assert.strictEqual(util.inspect(valsMapIterEntries), '[ [ 1, 2 ], true ]');
assert.strictEqual(util.inspect(valsMapIterKeys), '[ [ 1 ], false ]');
}
// Test for other constructors in different context.
{
let obj = vm.runInNewContext('(function(){return {}})()', {});
assert.strictEqual(util.inspect(obj), '{}');
obj = vm.runInNewContext('const m=new Map();m.set(1,2);m', {});
assert.strictEqual(util.inspect(obj), 'Map(1) { 1 => 2 }');
obj = vm.runInNewContext('const s=new Set();s.add(1);s.add(2);s', {});
assert.strictEqual(util.inspect(obj), 'Set(2) { 1, 2 }');
obj = vm.runInNewContext('fn=function(){};new Promise(fn,fn)', {});
assert.strictEqual(util.inspect(obj), 'Promise { <pending> }');
}
// Test for property descriptors.
{
const getter = Object.create(null, {
a: {
get: function() { return 'aaa'; }
}
});
const setter = Object.create(null, {
b: { // eslint-disable-line accessor-pairs
set: function() {}
}
});
const getterAndSetter = Object.create(null, {
c: {
get: function() { return 'ccc'; },
set: function() {}
}
});
assert.strictEqual(
util.inspect(getter, true),
'[Object: null prototype] { [a]: [Getter] }'
);
assert.strictEqual(
util.inspect(setter, true),
'[Object: null prototype] { [b]: [Setter] }'
);
assert.strictEqual(
util.inspect(getterAndSetter, true),
'[Object: null prototype] { [c]: [Getter/Setter] }'
);
}
// Exceptions should print the error message, not '{}'.
{
[
new Error(),
new Error('FAIL'),
new TypeError('FAIL'),
new SyntaxError('FAIL'),
].forEach((err) => {
assert.strictEqual(util.inspect(err), err.stack);
});
assert.throws(
() => undef(), // eslint-disable-line no-undef
(e) => {
assert.strictEqual(util.inspect(e), e.stack);
return true;
}
);
const ex = util.inspect(new Error('FAIL'), true);
assert(ex.includes('Error: FAIL'));
assert(ex.includes('[stack]'));
assert(ex.includes('[message]'));
}
{
const tmp = Error.stackTraceLimit;
Error.stackTraceLimit = 0;
const err = new Error('foo');
const err2 = new Error('foo\nbar');
assert.strictEqual(util.inspect(err, { compact: true }), '[Error: foo]');
assert(err.stack);
delete err.stack;
assert(!err.stack);
assert.strictEqual(util.inspect(err, { compact: true }), '[Error: foo]');
assert.strictEqual(
util.inspect(err2, { compact: true }),
'[Error: foo\nbar]'
);
err.bar = true;
err2.bar = true;
assert.strictEqual(
util.inspect(err, { compact: true }),
'{ [Error: foo] bar: true }'
);
assert.strictEqual(
util.inspect(err2, { compact: true }),
'{ [Error: foo\nbar]\n bar: true }'
);
assert.strictEqual(
util.inspect(err, { compact: true, breakLength: 5 }),
'{ [Error: foo]\n bar: true }'
);
assert.strictEqual(
util.inspect(err, { compact: true, breakLength: 1 }),
'{ [Error: foo]\n bar:\n true }'
);
assert.strictEqual(
util.inspect(err2, { compact: true, breakLength: 5 }),
'{ [Error: foo\nbar]\n bar: true }'
);
assert.strictEqual(
util.inspect(err, { compact: false }),
'[Error: foo] {\n bar: true\n}'
);
assert.strictEqual(
util.inspect(err2, { compact: false }),
'[Error: foo\nbar] {\n bar: true\n}'
);
Error.stackTraceLimit = tmp;
}
// Prevent enumerable error properties from being printed.
{
let err = new Error();
err.message = 'foobar';
let out = util.inspect(err).split('\n');
assert.strictEqual(out[0], 'Error: foobar');
assert(out[out.length - 1].startsWith(' at '));
// Reset the error, the stack is otherwise not recreated.
err = new Error();
err.message = 'foobar';
err.name = 'Unique';
Object.defineProperty(err, 'stack', { value: err.stack, enumerable: true });
out = util.inspect(err).split('\n');
assert.strictEqual(out[0], 'Unique: foobar');
assert(out[out.length - 1].startsWith(' at '));
err.name = 'Baz';
out = util.inspect(err).split('\n');
assert.strictEqual(out[0], 'Unique: foobar');
assert.strictEqual(out[out.length - 2], " name: 'Baz'");
assert.strictEqual(out[out.length - 1], '}');
}
// Doesn't capture stack trace.
{
function BadCustomError(msg) {
Error.call(this);
Object.defineProperty(this, 'message',
{ value: msg, enumerable: false });
Object.defineProperty(this, 'name',
{ value: 'BadCustomError', enumerable: false });
}
Object.setPrototypeOf(BadCustomError.prototype, Error.prototype);
Object.setPrototypeOf(BadCustomError, Error);
assert.strictEqual(
util.inspect(new BadCustomError('foo')),
'[BadCustomError: foo]'
);
}
// Tampered error stack or name property (different type than string).
// Note: Symbols are not supported by `Error#toString()` which is called by
// accessing the `stack` property.
[
[404, '404: foo', '[404]'],
[0, '0: foo', '[RangeError: foo]'],
[0n, '0: foo', '[RangeError: foo]'],
[null, 'null: foo', '[RangeError: foo]'],
[undefined, 'RangeError: foo', '[RangeError: foo]'],
[false, 'false: foo', '[RangeError: foo]'],
['', 'foo', '[RangeError: foo]'],
[[1, 2, 3], '1,2,3: foo', '[1,2,3]'],
].forEach(([value, outputStart, stack]) => {
let err = new RangeError('foo');
err.name = value;
assert(
util.inspect(err).startsWith(outputStart),
util.format(
'The name set to %o did not result in the expected output "%s"',
value,
outputStart
)
);
err = new RangeError('foo');
err.stack = value;
assert.strictEqual(util.inspect(err), stack);
});
// https://github.com/nodejs/node-v0.x-archive/issues/1941
assert.strictEqual(util.inspect(Object.create(Date.prototype)), 'Date {}');
// https://github.com/nodejs/node-v0.x-archive/issues/1944
{
const d = new Date();
d.toUTCString = null;
util.inspect(d);
}
// Should not throw.
{
const d = new Date();
d.toISOString = null;
util.inspect(d);
}
// Should not throw.
{
const r = /regexp/;
r.toString = null;
util.inspect(r);
}
// See https://github.com/nodejs/node-v0.x-archive/issues/2225
{
const x = { [util.inspect.custom]: util.inspect };
assert(util.inspect(x).includes(
'[Symbol(nodejs.util.inspect.custom)]: [Function: inspect] {\n'));
}
// `util.inspect` should display the escaped value of a key.
{
const w = {
'\\': 1,
'\\\\': 2,
'\\\\\\': 3,
'\\\\\\\\': 4,
'\n': 5,
'\r': 6
};
const y = ['a', 'b', 'c'];
y['\\\\'] = 'd';
y['\n'] = 'e';
y['\r'] = 'f';
assert.strictEqual(
util.inspect(w),
"{ '\\\\': 1, '\\\\\\\\': 2, '\\\\\\\\\\\\': 3, " +
"'\\\\\\\\\\\\\\\\': 4, '\\n': 5, '\\r': 6 }"
);
assert.strictEqual(
util.inspect(y),
"[ 'a', 'b', 'c', '\\\\\\\\': 'd', " +
"'\\n': 'e', '\\r': 'f' ]"
);
}
// Test util.inspect.styles and util.inspect.colors.
{
function testColorStyle(style, input, implicit) {
const colorName = util.inspect.styles[style];
let color = ['', ''];
if (util.inspect.colors[colorName])
color = util.inspect.colors[colorName];
const withoutColor = util.inspect(input, false, 0, false);
const withColor = util.inspect(input, false, 0, true);
const expect = `\u001b[${color[0]}m${withoutColor}\u001b[${color[1]}m`;
assert.strictEqual(
withColor,
expect,
`util.inspect color for style ${style}`);
}
testColorStyle('special', function() {});
testColorStyle('number', 123.456);
testColorStyle('boolean', true);
testColorStyle('undefined', undefined);
testColorStyle('null', null);
testColorStyle('string', 'test string');
testColorStyle('date', new Date());
testColorStyle('regexp', /regexp/);
}
// An object with "hasOwnProperty" overwritten should not throw.
util.inspect({ hasOwnProperty: null });
// New API, accepts an "options" object.
{
const subject = { foo: 'bar', hello: 31, a: { b: { c: { d: 0 } } } };
Object.defineProperty(subject, 'hidden', { enumerable: false, value: null });
assert.strictEqual(
util.inspect(subject, { showHidden: false }).includes('hidden'),
false
);
assert.strictEqual(
util.inspect(subject, { showHidden: true }).includes('hidden'),
true
);
assert.strictEqual(
util.inspect(subject, { colors: false }).includes('\u001b[32m'),
false
);
assert.strictEqual(
util.inspect(subject, { colors: true }).includes('\u001b[32m'),
true
);
assert.strictEqual(
util.inspect(subject, { depth: 2 }).includes('c: [Object]'),
true
);
assert.strictEqual(
util.inspect(subject, { depth: 0 }).includes('a: [Object]'),
true
);
assert.strictEqual(
util.inspect(subject, { depth: null }).includes('{ d: 0 }'),
true
);
assert.strictEqual(
util.inspect(subject, { depth: undefined }).includes('{ d: 0 }'),
true
);
}
{
// "customInspect" option can enable/disable calling [util.inspect.custom]().
const subject = { [util.inspect.custom]: () => 123 };
assert.strictEqual(
util.inspect(subject, { customInspect: true }).includes('123'),
true
);
assert.strictEqual(
util.inspect(subject, { customInspect: true }).includes('inspect'),
false
);
assert.strictEqual(
util.inspect(subject, { customInspect: false }).includes('123'),
false
);
assert.strictEqual(
util.inspect(subject, { customInspect: false }).includes('inspect'),
true
);
// A custom [util.inspect.custom]() should be able to return other Objects.
subject[util.inspect.custom] = () => ({ foo: 'bar' });
assert.strictEqual(util.inspect(subject), "{ foo: 'bar' }");
subject[util.inspect.custom] = common.mustCall((depth, opts) => {
const clone = { ...opts };
// This might change at some point but for now we keep the stylize function.
// The function should either be documented or an alternative should be
// implemented.
assert.strictEqual(typeof opts.stylize, 'function');
assert.strictEqual(opts.seen, undefined);
assert.strictEqual(opts.budget, undefined);
assert.strictEqual(opts.indentationLvl, undefined);
assert.strictEqual(opts.showHidden, false);
assert.deepStrictEqual(
new Set(Object.keys(util.inspect.defaultOptions).concat(['stylize'])),
new Set(Object.keys(opts))
);
opts.showHidden = true;
return { [util.inspect.custom]: common.mustCall((depth, opts2) => {
assert.deepStrictEqual(clone, opts2);
}) };
});
util.inspect(subject);
// util.inspect.custom is a shared symbol which can be accessed as
// Symbol.for("nodejs.util.inspect.custom").
const inspect = Symbol.for('nodejs.util.inspect.custom');
subject[inspect] = () => ({ baz: 'quux' });
assert.strictEqual(util.inspect(subject), '{ baz: \'quux\' }');
subject[inspect] = (depth, opts) => {
assert.strictEqual(opts.customInspectOptions, true);
assert.strictEqual(opts.seen, null);
return {};
};
util.inspect(subject, { customInspectOptions: true, seen: null });
}
{
const subject = { [util.inspect.custom]: common.mustCall((depth, opts) => {
assert.strictEqual(depth, null);
assert.strictEqual(opts.compact, true);
}) };
util.inspect(subject, { depth: null, compact: true });
}
{
// Returning `this` from a custom inspection function works.
const subject = { a: 123, [util.inspect.custom]() { return this; } };
const UIC = 'nodejs.util.inspect.custom';
assert.strictEqual(
util.inspect(subject),
`{\n a: 123,\n [Symbol(${UIC})]: [Function: [${UIC}]]\n}`
);
}
// Verify that it's possible to use the stylize function to manipulate input.
assert.strictEqual(
util.inspect([1, 2, 3], { stylize() { return 'x'; } }),
'[ x, x, x ]'
);
// Using `util.inspect` with "colors" option should produce as many lines as
// without it.
{