Merge pull request #5876 from RyanCavanaugh/javaScriptPrototypes

JavaScript prototype class inference

tests/cases/fourslash/javaScriptPrototype1.ts

@@ -0,0 +1,46 @@
+///<reference path="fourslash.ts" />
+
+// Assignments to the 'prototype' property of a function create a class
+
+// @allowNonTsExtensions: true
+// @Filename: myMod.js
+//// function myCtor(x) {
+//// }
+//// myCtor.prototype.foo = function() { return 32 };
+//// myCtor.prototype.bar = function() { return '' };
+//// 
+//// var m = new myCtor(10);
+//// m/*1*/
+//// var a = m.foo;
+//// a/*2*/
+//// var b = a();
+//// b/*3*/
+//// var c = m.bar();
+//// c/*4*/
+
+
+// Members of the class instance
+goTo.marker('1');
+edit.insert('.');
+verify.memberListContains('foo', undefined, undefined, 'property');
+verify.memberListContains('bar', undefined, undefined, 'property');
+edit.backspace();
+
+// Members of a class method (1)
+goTo.marker('2');
+edit.insert('.');
+verify.memberListContains('length', undefined, undefined, 'property');
+edit.backspace();
+
+// Members of the invocation of a class method (1)
+goTo.marker('3');
+edit.insert('.');
+verify.memberListContains('toFixed', undefined, undefined, 'method');
+verify.not.memberListContains('substr', undefined, undefined, 'method');
+edit.backspace();
+
+// Members of the invocation of a class method (2)
+goTo.marker('4');
+edit.insert('.');
+verify.memberListContains('substr', undefined, undefined, 'method');
+verify.not.memberListContains('toFixed', undefined, undefined, 'method');

tests/cases/fourslash/javaScriptPrototype2.ts

@@ -0,0 +1,36 @@
+///<reference path="fourslash.ts" />
+
+// Assignments to 'this' in the constructorish body create
+// properties with those names
+
+// @allowNonTsExtensions: true
+// @Filename: myMod.js
+//// function myCtor(x) {
+////     this.qua = 10;
+//// }
+//// myCtor.prototype.foo = function() { return 32 };
+//// myCtor.prototype.bar = function() { return '' };
+//// 
+//// var m = new myCtor(10);
+//// m/*1*/
+//// var x = m.qua;
+//// x/*2*/
+//// myCtor/*3*/
+
+// Verify the instance property exists
+goTo.marker('1');
+edit.insert('.');
+verify.completionListContains('qua', undefined, undefined, 'property');
+edit.backspace();
+
+// Verify the type of the instance property
+goTo.marker('2');
+edit.insert('.');
+verify.completionListContains('toFixed', undefined, undefined, 'method');
+
+goTo.marker('3');
+edit.insert('.');
+// Make sure symbols don't leak out into the constructor
+verify.completionListContains('qua', undefined, undefined, 'warning');
+verify.completionListContains('foo', undefined, undefined, 'warning');
+verify.completionListContains('bar', undefined, undefined, 'warning');

tests/cases/fourslash/javaScriptPrototype3.ts

@@ -0,0 +1,20 @@
+///<reference path="fourslash.ts" />
+
+// Inside an inferred method body, the type of 'this' is the class type
+
+// @allowNonTsExtensions: true
+// @Filename: myMod.js
+//// function myCtor(x) {
+////     this.qua = 10;
+//// }
+//// myCtor.prototype.foo = function() { return this/**/; };
+//// myCtor.prototype.bar = function() { return '' };
+//// 
+
+goTo.marker();
+edit.insert('.');
+
+// Check members of the function
+verify.completionListContains('foo', undefined, undefined, 'property');
+verify.completionListContains('bar', undefined, undefined, 'property');
+verify.completionListContains('qua', undefined, undefined, 'property');

tests/cases/fourslash/javaScriptPrototype4.ts

@@ -0,0 +1,21 @@
+///<reference path="fourslash.ts" />
+
+// Check for any odd symbol leakage
+
+// @allowNonTsExtensions: true
+// @Filename: myMod.js
+//// function myCtor(x) {
+////     this.qua = 10;
+//// }
+//// myCtor.prototype.foo = function() { return 32 };
+//// myCtor.prototype.bar = function() { return '' };
+//// 
+//// myCtor/*1*/
+
+goTo.marker('1');
+edit.insert('.');
+
+// Check members of the function
+verify.completionListContains('foo', undefined, undefined, 'warning');
+verify.completionListContains('bar', undefined, undefined, 'warning');
+verify.completionListContains('qua', undefined, undefined, 'warning');

tests/cases/fourslash/javaScriptPrototype5.ts

@@ -0,0 +1,19 @@
+///<reference path="fourslash.ts" />
+
+// No prototype assignments are needed to enable class inference
+
+// @allowNonTsExtensions: true
+// @Filename: myMod.js
+//// function myCtor() {
+////     this.foo = 'hello';
+////     this.bar = 10;
+//// }
+//// let x = new myCtor();
+//// x/**/
+
+goTo.marker();
+edit.insert('.');
+
+// Check members of the function
+verify.completionListContains('foo', undefined, undefined, 'property');
+verify.completionListContains('bar', undefined, undefined, 'property');