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aa6fac68da
ESLint 4.x has stricter linting than previous versions. We are currently using the legacy indentation rules in the test directory. This commit changes the indentation of files to comply with the stricter 4.x linting and enable stricter linting in the test directory. PR-URL: https://github.com/nodejs/node/pull/14431 Reviewed-By: Refael Ackermann <refack@gmail.com> Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com> Reviewed-By: Trevor Norris <trev.norris@gmail.com>
102 lines
2.2 KiB
JavaScript
102 lines
2.2 KiB
JavaScript
'use strict';
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const common = require('../common');
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const assert = require('assert');
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const inherits = require('util').inherits;
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const errCheck = common.expectsError({
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code: 'ERR_INVALID_ARG_TYPE',
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type: TypeError,
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message: 'The "superCtor" argument must be of type function'
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});
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// super constructor
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function A() {
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this._a = 'a';
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}
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A.prototype.a = function() { return this._a; };
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// one level of inheritance
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function B(value) {
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A.call(this);
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this._b = value;
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}
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inherits(B, A);
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B.prototype.b = function() { return this._b; };
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assert.strictEqual(B.super_, A);
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const b = new B('b');
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assert.strictEqual(b.a(), 'a');
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assert.strictEqual(b.b(), 'b');
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assert.strictEqual(b.constructor, B);
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// two levels of inheritance
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function C() {
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B.call(this, 'b');
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this._c = 'c';
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}
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inherits(C, B);
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C.prototype.c = function() { return this._c; };
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C.prototype.getValue = function() { return this.a() + this.b() + this.c(); };
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assert.strictEqual(C.super_, B);
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const c = new C();
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assert.strictEqual(c.getValue(), 'abc');
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assert.strictEqual(c.constructor, C);
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// inherits can be called after setting prototype properties
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function D() {
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C.call(this);
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this._d = 'd';
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}
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D.prototype.d = function() { return this._d; };
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inherits(D, C);
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assert.strictEqual(D.super_, C);
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const d = new D();
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assert.strictEqual(d.c(), 'c');
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assert.strictEqual(d.d(), 'd');
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assert.strictEqual(d.constructor, D);
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// ES6 classes can inherit from a constructor function
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class E {
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constructor() {
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D.call(this);
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this._e = 'e';
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}
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e() { return this._e; }
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}
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inherits(E, D);
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assert.strictEqual(E.super_, D);
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const e = new E();
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assert.strictEqual(e.getValue(), 'abc');
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assert.strictEqual(e.d(), 'd');
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assert.strictEqual(e.e(), 'e');
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assert.strictEqual(e.constructor, E);
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// should throw with invalid arguments
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assert.throws(function() {
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inherits(A, {});
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}, common.expectsError({
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code: 'ERR_INVALID_ARG_TYPE',
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type: TypeError,
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message: 'The "superCtor.prototype" property must be of type function'
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})
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);
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assert.throws(function() {
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inherits(A, null);
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}, errCheck);
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assert.throws(function() {
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inherits(null, A);
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}, common.expectsError({
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code: 'ERR_INVALID_ARG_TYPE',
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type: TypeError,
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message: 'The "ctor" argument must be of type function'
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})
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);
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