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ES2015 + emitDecoratorMetadata causes Cannot access before intialization #15077
Description
🐞 bug report
Affected Package
@angular/compiler
Is this a regression?
No, but this is more relevant now because angular-cli permits ES2015 targets.
Description
When targeting ES2015, emitDecoratorMetadata causes a ReferenceError.
🔬 Minimal Reproduction
https://github.com/pauldraper/angular-decorator-metadata
ng serve
Load in browser.
🔥 Exception or Error
main.js:98 Uncaught ReferenceError: Cannot access 'AppService' before initialization
at Module../src/app.component.ts (main.js:98)
at __webpack_require__ (runtime.js:80)
at Module../src/app.module.ts (main.js:123)
at __webpack_require__ (runtime.js:80)
at Module../src/main.ts (main.js:157)
at __webpack_require__ (runtime.js:80)
at Object.0 (main.js:174)
at __webpack_require__ (runtime.js:80)
at checkDeferredModules (runtime.js:46)
at Array.webpackJsonpCallback [as push] (runtime.js:33)
🌍 Your Environment
Angular Version:
Angular 8.1.1
Anything else relevant?
Removing emitDecoratorMetadata, or targeting es5 fixes the problem.
Activity
alan-agius4 commentedon Jul 15, 2019
Hi, is there a reason why you need
emitDecoratorMetadatato be true?By the way @pauldraper, love your repo.
clydin commentedon Jul 15, 2019
This TypeScript option has a fundamental design limitation with ES2015+ code and is best avoided when targeting such output. As such this is an issue with TypeScript itself and not Angular.
Angular 8+ no longer requires the option. It was also previously only required for JIT mode which is typically only used in development.
piotrpalek commentedon Aug 7, 2019
Maybe it would be good to check for that when upgrading angular, or mention it in the docs? This just took me quiet a bit to figure out after upgrading from angular 7 -> 8
angular-automatic-lock-bot commentedon Sep 9, 2019
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