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test-util-inspect.js
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// 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.
// Flags: --expose_internals
'use strict';
const common = require('../common');
const assert = require('assert');
const JSStream = process.binding('js_stream').JSStream;
const util = require('util');
const vm = require('vm');
const { previewMapIterator } = require('internal/v8');
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() {}), '[Function]');
assert.strictEqual(util.inspect(() => {}), '[Function]');
assert.strictEqual(util.inspect(async function() {}), '[AsyncFunction]');
assert.strictEqual(util.inspect(async () => {}), '[AsyncFunction]');
assert.strictEqual(util.inspect(function*() {}), '[GeneratorFunction]');
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\u0001'), "'\\n\\u0001'");
assert.strictEqual(
util.inspect(`${Array(75).fill(1)}'\n\u001d\n\u0003`),
`'${Array(75).fill(1)}\\'\\n\\u001d\\n\\u0003'`
);
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] }');
assert.strictEqual(util.inspect({ a: async function() {} }),
'{ a: [AsyncFunction: a] }');
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),
'{ a: { b: { c: { d: 2 } } } }');
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 [ ]');
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.strictEqual(util.inspect((new JSStream())._externalStream),
'[External]');
{
const regexp = /regexp/;
regexp.aprop = 42;
assert.strictEqual(util.inspect({ a: regexp }, false, 0), '{ a: /regexp/ }');
}
assert(/Object/.test(
util.inspect({ a: { a: { a: { a: {} } } } }, undefined, undefined, true)
));
assert(!/Object/.test(
util.inspect({ a: { a: { a: { a: {} } } } }, undefined, null, true)
));
for (const showHidden of [true, false]) {
const ab = new ArrayBuffer(4);
const dv = new DataView(ab, 1, 2);
assert.strictEqual(
util.inspect(ab, showHidden),
'ArrayBuffer { byteLength: 4 }'
);
assert.strictEqual(util.inspect(new DataView(ab, 1, 2), showHidden),
'DataView {\n' +
' byteLength: 2,\n' +
' byteOffset: 1,\n' +
' buffer: ArrayBuffer { byteLength: 4 } }');
assert.strictEqual(
util.inspect(ab, showHidden),
'ArrayBuffer { byteLength: 4 }'
);
assert.strictEqual(util.inspect(dv, showHidden),
'DataView {\n' +
' byteLength: 2,\n' +
' byteOffset: 1,\n' +
' buffer: ArrayBuffer { byteLength: 4 } }');
ab.x = 42;
dv.y = 1337;
assert.strictEqual(util.inspect(ab, showHidden),
'ArrayBuffer { byteLength: 4, x: 42 }');
assert.strictEqual(util.inspect(dv, showHidden),
'DataView {\n' +
' byteLength: 2,\n' +
' byteOffset: 1,\n' +
' buffer: ArrayBuffer { byteLength: 4, x: 42 },\n' +
' y: 1337 }');
}
// Now do the same checks but from a different context.
for (const showHidden of [true, 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 { byteLength: 4 }'
);
assert.strictEqual(util.inspect(new DataView(ab, 1, 2), showHidden),
'DataView {\n' +
' byteLength: 2,\n' +
' byteOffset: 1,\n' +
' buffer: ArrayBuffer { byteLength: 4 } }');
assert.strictEqual(
util.inspect(ab, showHidden),
'ArrayBuffer { byteLength: 4 }'
);
assert.strictEqual(util.inspect(dv, showHidden),
'DataView {\n' +
' byteLength: 2,\n' +
' byteOffset: 1,\n' +
' buffer: ArrayBuffer { byteLength: 4 } }');
ab.x = 42;
dv.y = 1337;
assert.strictEqual(util.inspect(ab, showHidden),
'ArrayBuffer { byteLength: 4, x: 42 }');
assert.strictEqual(util.inspect(dv, showHidden),
'DataView {\n' +
' byteLength: 2,\n' +
' byteOffset: 1,\n' +
' buffer: ArrayBuffer { byteLength: 4, x: 42 },\n' +
' y: 1337 }');
}
[ 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, true),
`${constructor.name} [\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: ${byteLength} } ]`);
assert.strictEqual(
util.inspect(array, false),
`${constructor.name} [ 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} [\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: ${byteLength} } ]`);
assert.strictEqual(
util.inspect(array, false),
`${constructor.name} [ 65, 97 ]`
);
});
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 }),
"{ name: 'Tim', [hidden]: 'secret' }"
);
assert.strictEqual(
util.inspect(Object.create(null, {
name: { value: 'Tim', enumerable: true },
hidden: { value: 'secret' }
})),
'{ name: \'Tim\' }'
);
// Dynamic properties.
{
assert.strictEqual(
util.inspect({ get readonly() {} }),
'{ readonly: [Getter] }');
assert.strictEqual(
util.inspect({ get readwrite() {}, 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), '{ a: [Circular] }');
}
// 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';
const arr = new CustomArray(50);
assert.strictEqual(util.inspect(arr), 'CustomArray [ <50 empty items> ]');
}
// 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 ]");
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 ]"
].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] 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 for Array constructor in different context.
{
const map = new Map();
map.set(1, 2);
const vals = previewMapIterator(map.entries());
const valsOutput = [];
for (const o of vals) {
valsOutput.push(o);
}
assert.strictEqual(util.inspect(valsOutput), '[ [ 1, 2 ] ]');
}
// Test for other constructors in different context.
{
let obj = vm.runInNewContext('(function(){return {}})()', {});
assert.strictEqual(util.inspect(obj), '{}');
obj = vm.runInNewContext('var m=new Map();m.set(1,2);m', {});
assert.strictEqual(util.inspect(obj), 'Map { 1 => 2 }');
obj = vm.runInNewContext('var s=new Set();s.add(1);s.add(2);s', {});
assert.strictEqual(util.inspect(obj), 'Set { 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), '{ [a]: [Getter] }');
assert.strictEqual(util.inspect(setter, true), '{ [b]: [Setter] }');
assert.strictEqual(
util.inspect(getterAndSetter, true),
'{ [c]: [Getter/Setter] }'
);
}
// Exceptions should print the error message, not '{}'.
{
const errors = [];
errors.push(new Error());
errors.push(new Error('FAIL'));
errors.push(new TypeError('FAIL'));
errors.push(new SyntaxError('FAIL'));
errors.forEach((err) => {
assert.strictEqual(util.inspect(err), err.stack);
});
try {
undef(); // eslint-disable-line no-undef
} catch (e) {
assert.strictEqual(util.inspect(e), e.stack);
}
const ex = util.inspect(new Error('FAIL'), true);
assert(ex.includes('Error: FAIL'));
assert(ex.includes('[stack]'));
assert(ex.includes('[message]'));
}
// 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 });
}
util.inherits(BadCustomError, Error);
assert.strictEqual(
util.inspect(new BadCustomError('foo')),
'[BadCustomError: foo]'
);
}
// GH-1941
assert.strictEqual(util.inspect(Object.create(Date.prototype)), 'Date {}');
// GH-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);
// Bug with user-supplied inspect function returns non-string.
util.inspect([{ inspect: () => 123 }]);
// GH-2225
{
const x = { inspect: util.inspect };
assert.strictEqual(util.inspect(x).includes('inspect'), true);
}
// 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 inspect() on objects.
const subject = { inspect: () => 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
);
// Custom inspect() functions should be able to return other Objects.
subject.inspect = () => ({ foo: 'bar' });
assert.strictEqual(util.inspect(subject), '{ foo: \'bar\' }');
subject.inspect = (depth, opts) => {
assert.strictEqual(opts.customInspectOptions, true);
};
util.inspect(subject, { customInspectOptions: 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: false }).includes('123'),
false
);
// 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] = (depth, opts) => {
assert.strictEqual(opts.customInspectOptions, true);
};
util.inspect(subject, { customInspectOptions: true });
}
{
// [util.inspect.custom] takes precedence over inspect.
const subject = {
[util.inspect.custom]() { return 123; },
inspect() { return 456; }
};
assert.strictEqual(
util.inspect(subject, { customInspect: true }).includes('123'),
true
);
assert.strictEqual(
util.inspect(subject, { customInspect: false }).includes('123'),
false
);
assert.strictEqual(
util.inspect(subject, { customInspect: true }).includes('456'),
false
);
assert.strictEqual(
util.inspect(subject, { customInspect: false }).includes('456'),
false
);
}
{
// Returning `this` from a custom inspection function works.
assert.strictEqual(util.inspect({ a: 123, inspect() { return this; } }),
'{ a: 123, inspect: [Function: inspect] }');
const subject = { a: 123, [util.inspect.custom]() { return this; } };
const UIC = 'util.inspect.custom';
assert.strictEqual(util.inspect(subject),
`{ a: 123,\n [Symbol(${UIC})]: [Function: [${UIC}]] }`);
}
// util.inspect with "colors" option should produce as many lines as without it.
{
function testLines(input) {
const countLines = (str) => (str.match(/\n/g) || []).length;
const withoutColor = util.inspect(input);
const withColor = util.inspect(input, { colors: true });
assert.strictEqual(countLines(withoutColor), countLines(withColor));
}
const bigArray = new Array(100).fill().map((value, index) => index);
testLines([1, 2, 3, 4, 5, 6, 7]);
testLines(bigArray);
testLines({ foo: 'bar', baz: 35, b: { a: 35 } });
testLines({ a: { a: 3, b: 1, c: 1, d: 1, e: 1, f: 1, g: 1, h: 1 }, b: 1 });
testLines({
foo: 'bar',
baz: 35,
b: { a: 35 },
veryLongKey: 'very long value',
evenLongerKey: ['with even longer value in array']
});
}
// Test boxed primitives output the correct values.
assert.strictEqual(util.inspect(new String('test')), '[String: \'test\']');
assert.strictEqual(
util.inspect(Object(Symbol('test'))),
'[Symbol: Symbol(test)]'
);
assert.strictEqual(util.inspect(new Boolean(false)), '[Boolean: false]');
assert.strictEqual(util.inspect(new Boolean(true)), '[Boolean: true]');
assert.strictEqual(util.inspect(new Number(0)), '[Number: 0]');
assert.strictEqual(util.inspect(new Number(-0)), '[Number: -0]');
assert.strictEqual(util.inspect(new Number(-1.1)), '[Number: -1.1]');
assert.strictEqual(util.inspect(new Number(13.37)), '[Number: 13.37]');
// Test boxed primitives with own properties.
{
const str = new String('baz');
str.foo = 'bar';
assert.strictEqual(util.inspect(str), '{ [String: \'baz\'] foo: \'bar\' }');
const bool = new Boolean(true);
bool.foo = 'bar';
assert.strictEqual(util.inspect(bool), '{ [Boolean: true] foo: \'bar\' }');
const num = new Number(13.37);
num.foo = 'bar';
assert.strictEqual(util.inspect(num), '{ [Number: 13.37] foo: \'bar\' }');
}
// Test es6 Symbol.
if (typeof Symbol !== 'undefined') {
assert.strictEqual(util.inspect(Symbol()), 'Symbol()');
assert.strictEqual(util.inspect(Symbol(123)), 'Symbol(123)');
assert.strictEqual(util.inspect(Symbol('hi')), 'Symbol(hi)');
assert.strictEqual(util.inspect([Symbol()]), '[ Symbol() ]');
assert.strictEqual(util.inspect({ foo: Symbol() }), '{ foo: Symbol() }');
const options = { showHidden: true };
let subject = {};
subject[Symbol('symbol')] = 42;
assert.strictEqual(util.inspect(subject), '{ [Symbol(symbol)]: 42 }');
assert.strictEqual(
util.inspect(subject, options),
'{ [Symbol(symbol)]: 42 }'
);
Object.defineProperty(
subject,
Symbol(),
{ enumerable: false, value: 'non-enum' });
assert.strictEqual(util.inspect(subject), '{ [Symbol(symbol)]: 42 }');
assert.strictEqual(
util.inspect(subject, options),
'{ [Symbol(symbol)]: 42, [Symbol()]: \'non-enum\' }'
);
subject = [1, 2, 3];
subject[Symbol('symbol')] = 42;
assert.strictEqual(util.inspect(subject),
'[ 1, 2, 3, [Symbol(symbol)]: 42 ]');
}
// Test Set.
{
assert.strictEqual(util.inspect(new Set()), 'Set {}');
assert.strictEqual(util.inspect(new Set([1, 2, 3])), 'Set { 1, 2, 3 }');
const set = new Set(['foo']);
set.bar = 42;
assert.strictEqual(
util.inspect(set, true),
'Set { \'foo\', [size]: 1, bar: 42 }'
);
}
// Test circular Set.
{
const set = new Set();
set.add(set);
assert.strictEqual(util.inspect(set), 'Set { [Circular] }');
}
// Test Map.
{
assert.strictEqual(util.inspect(new Map()), 'Map {}');
assert.strictEqual(util.inspect(new Map([[1, 'a'], [2, 'b'], [3, 'c']])),
'Map { 1 => \'a\', 2 => \'b\', 3 => \'c\' }');
const map = new Map([['foo', null]]);
map.bar = 42;
assert.strictEqual(util.inspect(map, true),
'Map { \'foo\' => null, [size]: 1, bar: 42 }');
}
// Test circular Map.
{
const map = new Map();
map.set(map, 'map');
assert.strictEqual(util.inspect(map), "Map { [Circular] => 'map' }");
map.set(map, map);
assert.strictEqual(util.inspect(map), 'Map { [Circular] => [Circular] }');
map.delete(map);
map.set('map', map);
assert.strictEqual(util.inspect(map), "Map { 'map' => [Circular] }");
}
// Test Promise.
{
const resolved = Promise.resolve(3);
assert.strictEqual(util.inspect(resolved), 'Promise { 3 }');
const rejected = Promise.reject(3);
assert.strictEqual(util.inspect(rejected), 'Promise { <rejected> 3 }');
// Squelch UnhandledPromiseRejection.
rejected.catch(() => {});
const pending = new Promise(() => {});
assert.strictEqual(util.inspect(pending), 'Promise { <pending> }');
const promiseWithProperty = Promise.resolve('foo');
promiseWithProperty.bar = 42;
assert.strictEqual(util.inspect(promiseWithProperty),
'Promise { \'foo\', bar: 42 }');
}
// Make sure it doesn't choke on polyfills. Unlike Set/Map, there is no standard
// interface to synchronously inspect a Promise, so our techniques only work on
// a bonafide native Promise.
{
const oldPromise = Promise;
global.Promise = function() { this.bar = 42; };
assert.strictEqual(util.inspect(new Promise()), '{ bar: 42 }');
global.Promise = oldPromise;
}
// Test Map iterators.
{
const map = new Map([['foo', 'bar']]);
assert.strictEqual(util.inspect(map.keys()), '[Map Iterator] { \'foo\' }');
assert.strictEqual(util.inspect(map.values()), '[Map Iterator] { \'bar\' }');
assert.strictEqual(util.inspect(map.entries()),
'[Map Iterator] { [ \'foo\', \'bar\' ] }');
// Make sure the iterator doesn't get consumed.
const keys = map.keys();
assert.strictEqual(util.inspect(keys), '[Map Iterator] { \'foo\' }');
assert.strictEqual(util.inspect(keys), '[Map Iterator] { \'foo\' }');
keys.extra = true;
assert.strictEqual(
util.inspect(keys, { maxArrayLength: 0 }),
'[Map Iterator] { ... more items, extra: true }');
}
// Test Set iterators.
{
const aSet = new Set([1, 3]);
assert.strictEqual(util.inspect(aSet.keys()), '[Set Iterator] { 1, 3 }');
assert.strictEqual(util.inspect(aSet.values()), '[Set Iterator] { 1, 3 }');
assert.strictEqual(util.inspect(aSet.entries()),
'[Set Iterator] { [ 1, 1 ], [ 3, 3 ] }');
// Make sure the iterator doesn't get consumed.
const keys = aSet.keys();
assert.strictEqual(util.inspect(keys), '[Set Iterator] { 1, 3 }');
assert.strictEqual(util.inspect(keys), '[Set Iterator] { 1, 3 }');
keys.extra = true;
assert.strictEqual(
util.inspect(keys, { maxArrayLength: 1 }),
'[Set Iterator] { 1, ... more items, extra: true }');
}
// Test alignment of items in container.
// Assumes that the first numeric character is the start of an item.
{
function checkAlignment(container) {
const lines = util.inspect(container).split('\n');
const numRE = /\d/;
let pos;
lines.forEach((line) => {
const npos = line.search(numRE);
if (npos !== -1) {
if (pos !== undefined) {
assert.strictEqual(pos, npos, 'container items not aligned');
}
pos = npos;
}
});
}
const bigArray = [];
for (let i = 0; i < 100; i++) {
bigArray.push(i);
}
const obj = {};
bigArray.forEach((prop) => {
obj[prop] = null;
});
checkAlignment(bigArray);
checkAlignment(obj);
checkAlignment(new Set(bigArray));
checkAlignment(new Map(bigArray.map((number) => [number, null])));
}
// Test display of constructors.
{
class ObjectSubclass {}
class ArraySubclass extends Array {}
class SetSubclass extends Set {}
class MapSubclass extends Map {}
class PromiseSubclass extends Promise {}
const x = new ObjectSubclass();
x.foo = 42;
assert.strictEqual(util.inspect(x),
'ObjectSubclass { foo: 42 }');
assert.strictEqual(util.inspect(new ArraySubclass(1, 2, 3)),
'ArraySubclass [ 1, 2, 3 ]');
assert.strictEqual(util.inspect(new SetSubclass([1, 2, 3])),
'SetSubclass [Set] { 1, 2, 3 }');