Error with Angular Build Optimizer and ES2015 target

[coryrylan]

Bug Report or Feature Request (mark with an x)

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Versions.

macOS
Angular CLI 1.5.0-beta.1
Angular 4.4.3
TS 2.3.4

Repro steps.

In a new cli app set the target to es2015. This works with ng serve --prod and ng build --prod. Run ng serve --prod --build-optimizer or ng build --prod --build-optimizer and there will be a runtime error on application start up.

main.39bafd92ae514fbdcd5b.bundle.js:1 Uncaught ReferenceError: Must call super constructor in derived class before accessing 'this' or returning from derived constructor
    at Be (main.39bafd92ae514fbdcd5b.bundle.js:1)
    at Object.<anonymous> (main.39bafd92ae514fbdcd5b.bundle.js:1)
    at Object.nkKW (main.39bafd92ae514fbdcd5b.bundle.js:1)
    at n (inline.36c967fef94b0262187c.bundle.js:1)
    at Object.cDNt (main.39bafd92ae514fbdcd5b.bundle.js:1)
    at n (inline.36c967fef94b0262187c.bundle.js:1)
    at Object.0 (main.39bafd92ae514fbdcd5b.bundle.js:1)
    at n (inline.36c967fef94b0262187c.bundle.js:1)
    at window.webpackJsonp (inline.36c967fef94b0262187c.bundle.js:1)
    at main.39bafd92ae514fbdcd5b.bundle.js:1

From the main bundle

class Be extends Ve {
  constructor(e) {
    // missing super call here
  }
  
  toString() {
    return `InjectionToken ${this._desc}`
  }
}
...

In the compiled class there is on super call on a derived class. When the build optimizer is not used the super call is there. The TS application code has no extended bases classes so I'm guessing its coming from the vendors but unfortunately something is broken with the source mapping for me with es2015 as well.

[clydin]

What version of typescript is the project using? There is the possibility of some issues with several of the build optimizer passes when used with 2.4+ and es2015+.

[coryrylan]

@clydin This was running with TS 2.3.4

[filipesilva]

Found the problem, super calls are being marked as pure:

class ExtendedClass extends BaseClass {
    constructor(e) { /*@__PURE__*/ super(e); }
    toString() { return this._desc; }
}

[filipesilva]

angular/devkit#168 will fix this.

[filipesilva]

Will be out in the next release.