Comments (7)
Seeing the same. In fact, anything with int
is failing for me. Using number
though with parameter annotations works, but not for field annotations. For example, this works fine:
class MyClass {
constructor(xArg:number, yArg:number) {
this.x = xArg;
this.y = yArg;
}
}
var myClass = new MyClass(1, 2);
console.log(myClass);
var myClass2 = new MyClass("test", "test"); // this will fail in the console (as expected)
But this doesn't:
class MyClass {
x:number;
y:number;
}
from atscript-playground.
I solved the problem on my side by adding this to the config.json : "memberVariables":true
I guessed it by looking at this line of the traceur code: https://github.com/google/traceur-compiler/blob/master/src/Options.js#L143
from atscript-playground.
Interesting. I can get it to compile by doing that also. I can also define a class like above with:
export class Point {
x:int;
}
But if I try to instantiate it like so:
var point = new Point(5);
console.log(point);
I see this in my console:
Point {x: (...)}
x: [Exception: ReferenceError: int is not defined]
__proto__: Point
And this is my config:
{
"traceur": {
"modules": "register",
"moduleName" : true,
"script": false,
"types": true,
"typeAssertions": true,
"typeAssertionModule": "assert",
"annotations": true,
"sourceMaps": false,
"memberVariables" : true,
"experimental" : true
}
}
from atscript-playground.
You get this error because you forgot to write a constructor :
export class Point {
x:int;
constructor(x:int){
this.x = x;
}
}
from atscript-playground.
Shouldn't the transpiler auto-generate the constructor for me? Take a look at the AtScript primer by @mhevery
Look at the Field Annotations section, specifically this line:
By specifying the fields in this way, the transpiler can generate the constructor which then pre-creates the fields.
from atscript-playground.
It specifies that the transpiler can generate the constructor. But it does not say if the constructor will assign values. In the example provided by @mhevery field variables are assigned to null.
class MyClass {
constructor() {
this.x = null; // auto-generated
this.y = null; // auto-generated
}
}
But when I transpile the code into es6 using traceur, there is no constructor :
class Point {
get x() {
return this.$__0;
}
set x(value) {
this.$__0 = value;
}
get y() {
return this.$__1;
}
set y(value) {
this.$__1 = value;
}
}
Object.defineProperty(Object.getOwnPropertyDescriptor(Point.prototype, "x").set, "parameters", {get: function() {
return [[int]];
}});
Object.defineProperty(Object.getOwnPropertyDescriptor(Point.prototype, "y").set, "parameters", {get: function() {
return [[int]];
}});
So, I agree with you on the fact it does not generate constructor, but anyway according to this document atScript will not auto-assign your fields. So, you'll have to write a constructor.
from atscript-playground.
work in progress.
On Thu Nov 20 2014 at 1:39:03 PM Martin Le Bas [email protected]
wrote:
It specifies that the transpiler can generate the constructor. But it
does not say if the constructor will assign values. In the example provided
by @mhevery https://github.com/mhevery field variables are assigned to
null.class MyClass {
constructor() {
this.x = null; // auto-generated
this.y = null; // auto-generated
}
}But when I transpile the code into es6 using traceur, there is no
constructor :class Point {
get x() {
return this.$__0;
}
set x(value) {
this.$__0 = value;
}
get y() {
return this.$__1;
}
set y(value) {
this.$__1 = value;
}
}Object.defineProperty(Object.getOwnPropertyDescriptor(Point.prototype, "x").set, "parameters", {get: function() {
return [[int]];
}});Object.defineProperty(Object.getOwnPropertyDescriptor(Point.prototype, "y").set, "parameters", {get: function() {
return [[int]];
}});So, I agree with you on the fact it does not generate constructor, but
anyway according to this document atScript will not auto-assign your
fields. So, you'll have to write a constructor.—
Reply to this email directly or view it on GitHub
#7 (comment)
.
from atscript-playground.
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