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util: change inspect depth default #17907

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util: change inspect depth default #17907

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94b7b01
streams: add custom inspect to BufferList
BridgeAR Dec 30, 2017
2d845cf
util: change util.inspect depth default
BridgeAR Dec 28, 2017
2721767
util: improve setting default options
BridgeAR Dec 28, 2017
606f06c
fixup address comments
BridgeAR Jan 2, 2018
3ca34ca
fixup update documentation
BridgeAR Jan 3, 2018
8ab8726
util: change %o depth default
BridgeAR Jan 3, 2018
e220598
fixup
BridgeAR Jan 15, 2018
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5 changes: 5 additions & 0 deletions lib/internal/streams/BufferList.js
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
'use strict';

const { Buffer } = require('buffer');
const { customInspectSymbol } = require('internal/util');

function copyBuffer(src, target, offset) {
Buffer.prototype.copy.call(src, target, offset);
Expand Down Expand Up @@ -73,4 +74,8 @@ module.exports = class BufferList {
}
return ret;
}

[customInspectSymbol]() {
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I’d just use util.inspect.custom here, it saves people looking at this code one round-trip to another file

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Done

return `${this.constructor.name} { length: ${this.length} }`;
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You could return { __proto__: Object.getPrototypeOf(this), length: this.length } which would also give coloring etc. for free.

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Using __proto__ will actually result in a `call stack size exceeded error. I decided to call inspect directly instead to highlight the color in case it is needed.

}
};
5 changes: 3 additions & 2 deletions lib/repl.js
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Expand Up @@ -104,8 +104,9 @@ function hasOwnProperty(obj, prop) {
// Can overridden with custom print functions, such as `probe` or `eyes.js`.
// This is the default "writer" value if none is passed in the REPL options.
const writer = exports.writer = (obj) => util.inspect(obj, writer.options);
writer.options =
Object.assign({}, util.inspect.defaultOptions, { showProxy: true });
writer.options = Object.assign({},
util.inspect.defaultOptions,
{ showProxy: true, depth: 2 });

exports._builtinLibs = internalModule.builtinLibs;

Expand Down
6 changes: 4 additions & 2 deletions lib/util.js
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Expand Up @@ -64,7 +64,7 @@ const {

const inspectDefaultOptions = Object.seal({
showHidden: false,
depth: 2,
depth: null,
colors: false,
customInspect: true,
showProxy: false,
Expand Down Expand Up @@ -317,7 +317,9 @@ Object.defineProperty(inspect, 'defaultOptions', {
if (options === null || typeof options !== 'object') {
throw new errors.TypeError('ERR_INVALID_ARG_TYPE', 'options', 'Object');
}
Object.assign(inspectDefaultOptions, options);
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Any reason for not using _extend?

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The type check has to be done again in that case.

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I doubt it will add a noticeable overhead but yes it makes sense.

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  1. Do we actually care about the performance of inspection? I thought we didn’t.
  2. Same concern here as @lpinca. This is quite literally reinventing the wheel, and type checks for object are quite fast in modern V8.

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Updated the use _extend as it will still be faster than Object.assign

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About the performance - just recently I heard that inspect came up in a flamegraph. Seems like people use it a lot. I am aware that setting the default options will not be a big thing but the first implementation (not changing inspect for console.*) used it a lot and that is why I decided to optimize it as well.

const keys = Object.keys(options);
for (var i = 0; i < keys.length; i++)
inspectDefaultOptions[keys[i]] = options[keys[i]];
return inspectDefaultOptions;
}
});
Expand Down
16 changes: 10 additions & 6 deletions test/parallel/test-util-inspect-proxy.js
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Expand Up @@ -48,13 +48,17 @@ const expected1 = 'Proxy [ {}, {} ]';
const expected2 = 'Proxy [ Proxy [ {}, {} ], {} ]';
const expected3 = 'Proxy [ Proxy [ Proxy [ {}, {} ], {} ], Proxy [ {}, {} ] ]';
const expected4 = 'Proxy [ Proxy [ {}, {} ], Proxy [ Proxy [ {}, {} ], {} ] ]';
const expected5 = 'Proxy [ Proxy [ Proxy [ Proxy [Array], {} ],' +
const expected5 = 'Proxy [ Proxy [ Proxy [ Proxy [ {}, {} ], {} ],' +
' Proxy [ {}, {} ] ],\n Proxy [ Proxy [ {}, {} ]' +
', Proxy [ Proxy [Array], {} ] ] ]';
const expected6 = 'Proxy [ Proxy [ Proxy [ Proxy [Array], Proxy [Array]' +
' ],\n Proxy [ Proxy [Array], Proxy [Array] ] ],\n' +
' Proxy [ Proxy [ Proxy [Array], Proxy [Array] ],\n' +
' Proxy [ Proxy [Array], Proxy [Array] ] ] ]';
', Proxy [ Proxy [ {}, {} ], {} ] ] ]';
const expected6 = 'Proxy [ Proxy [ Proxy [ Proxy [ Proxy [ {}, {} ], {} ], ' +
'Proxy [ {}, {} ] ],\n' +
' Proxy [ Proxy [ {}, {} ], ' +
'Proxy [ Proxy [ {}, {} ], {} ] ] ],\n' +
' Proxy [ Proxy [ Proxy [ Proxy [ {}, {} ], {} ], ' +
'Proxy [ {}, {} ] ],\n' +
' Proxy [ Proxy [ {}, {} ], ' +
'Proxy [ Proxy [ {}, {} ], {} ] ] ] ]';
assert.strictEqual(
util.inspect(proxy1, { showProxy: true, depth: null }),
expected1);
Expand Down
26 changes: 13 additions & 13 deletions test/parallel/test-util-inspect.js
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Expand Up @@ -68,7 +68,7 @@ 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] } } }');
'{ a: { b: { c: { d: 2 } } } }');
assert.strictEqual(
util.inspect({ 'a': { 'b': { 'c': { 'd': 2 } } } }, false, null),
'{ a: { b: { c: { d: 2 } } } }');
Expand Down Expand Up @@ -106,7 +106,7 @@ assert.strictEqual(util.inspect((new JSStream())._externalStream),
assert.strictEqual(util.inspect({ a: regexp }, false, 0), '{ a: /regexp/ }');
}

assert(/Object/.test(
assert(!/Object/.test(
util.inspect({ a: { a: { a: { a: {} } } } }, undefined, undefined, true)
));
assert(!/Object/.test(
Expand Down Expand Up @@ -1012,15 +1012,15 @@ if (typeof Symbol !== 'undefined') {
// Empty and circular before depth
{
const arr = [[[[]]]];
assert.strictEqual(util.inspect(arr), '[ [ [ [] ] ] ]');
assert.strictEqual(util.inspect(arr, { depth: 2 }), '[ [ [ [] ] ] ]');
arr[0][0][0][0] = [];
assert.strictEqual(util.inspect(arr), '[ [ [ [Array] ] ] ]');
assert.strictEqual(util.inspect(arr, { depth: 2 }), '[ [ [ [Array] ] ] ]');
arr[0][0][0] = {};
assert.strictEqual(util.inspect(arr), '[ [ [ {} ] ] ]');
assert.strictEqual(util.inspect(arr, { depth: 2 }), '[ [ [ {} ] ] ]');
arr[0][0][0] = { a: 2 };
assert.strictEqual(util.inspect(arr), '[ [ [ [Object] ] ] ]');
assert.strictEqual(util.inspect(arr, { depth: 2 }), '[ [ [ [Object] ] ] ]');
arr[0][0][0] = arr;
assert.strictEqual(util.inspect(arr), '[ [ [ [Circular] ] ] ]');
assert.strictEqual(util.inspect(arr, { depth: 2 }), '[ [ [ [Circular] ] ] ]');
}

// Corner cases.
Expand Down Expand Up @@ -1117,22 +1117,22 @@ if (typeof Symbol !== 'undefined') {
assert(!/1 more item/.test(util.inspect(arr)));
util.inspect.defaultOptions.maxArrayLength = oldOptions.maxArrayLength;
assert(/1 more item/.test(util.inspect(arr)));
util.inspect.defaultOptions.depth = null;
assert(!/Object/.test(util.inspect(obj)));
util.inspect.defaultOptions.depth = oldOptions.depth;
util.inspect.defaultOptions.depth = 2;
assert(/Object/.test(util.inspect(obj)));
util.inspect.defaultOptions.depth = oldOptions.depth;
assert(!/Object/.test(util.inspect(obj)));
assert.strictEqual(
JSON.stringify(util.inspect.defaultOptions),
JSON.stringify(oldOptions)
);

// Set multiple options through object assignment
util.inspect.defaultOptions = { maxArrayLength: null, depth: null };
util.inspect.defaultOptions = { maxArrayLength: null, depth: 2 };
assert(!/1 more item/.test(util.inspect(arr)));
assert(!/Object/.test(util.inspect(obj)));
assert(/Object/.test(util.inspect(obj)));
util.inspect.defaultOptions = oldOptions;
assert(/1 more item/.test(util.inspect(arr)));
assert(/Object/.test(util.inspect(obj)));
assert(!/Object/.test(util.inspect(obj)));
assert.strictEqual(
JSON.stringify(util.inspect.defaultOptions),
JSON.stringify(oldOptions)
Expand Down