tslib helpers replacement causes build failure "Module parse failed: 'import' and 'export' may only appear at the top level"

[MrAntix]

Bug Report or Feature Request (mark with an x)

- [x] bug report -> please search issues before submitting
- [ ] feature request

Command (mark with an x)

- [ ] new
- [x] build
- [ ] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Versions

npm 6.4.1

Node: 10.12.0
OS: win32 x64
Angular: 6.1.10
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router

Package Version

@angular-devkit/architect 0.8.5
@angular-devkit/build-angular 0.8.5
@angular-devkit/build-optimizer 0.8.5
@angular-devkit/build-webpack 0.8.5
@angular-devkit/core 0.8.4
@angular-devkit/schematics 0.8.4
@angular/cli 6.2.4
@ngtools/json-schema 1.1.0
@ngtools/webpack 6.2.5
@schematics/angular 0.8.4
@schematics/update 0.8.4
ng-packagr 4.3.0
rxjs 6.3.3
typescript 2.9.2
webpack 4.20.2

Repro steps

using a library with the following code

/*! Built with http://stenciljs.com */
export default function appGlobal(namespace, Context, window, document, resourcesUrl, hydratedCssClass) {(function(resourcesUrl){
var __extends = (this && this.__extends) || (function () {
    var extendStatics = Object.setPrototypeOf ||
        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
    return function (d, b) {
        extendStatics(d, b);
        function __() { this.constructor = d; }
        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
    };
})();

optimizer replaces __extends in the wrong place, the result is

Module parse failed: 'import' and 'export' may only appear at the top level (3:8)
You may need an appropriate loader to handle this file type.
| export default function appGlobal(namespace, Context, window, document, resourcesUrl, hydratedCssClass) {
|     (function (resourcesUrl) {
>         import { __extends } from "tslib";
|         /*!

Desired functionality

Can you put the imports uniquely at the top of the file?

[alan-agius4]

I have an idea or two how to solve this. That said, the above input looks rather strange, as TypeScript compiler doesn't emit helpers inside methods but rather always puts them in top level.

[MrAntix]

works on 7.0.1 - thanks

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