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__decorate helper should not use `this` when targeting modules
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**TypeScript Version:** 3.7.x-dev.201xxxxx
<!-- Search terms you tried before logging this (so others can find this issue more easily) -->
**Search Terms:** __decorate this module
**Code**
```ts
class Foo {
@property() x = 1;
}
```
**Expected behavior:**
Top-level `this` reference is not emitted.
**Actual behavior:**
The `__decrate` variable is declared like:
```ts
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
```
Since top-level `this` is always `undefined` in modules, `(this && this.__decorate) || ` can be omitted. It's only a few bytes, but the presence of top-level `this` also causes warnings in other downstream tools like Rollup.
A few other things could be fixed for an ES6+ helper, btw:
- Use `const` instead of `var` (allows for some VM optimizations)
- Remove `Reflect.decorate`
- Don't use `arguments`
**Playground Link:** https://www.typescriptlang.org/play/?ts=Nightly#code/MYGwhgzhAEBiD29oG8BQ1oAEAOAne2AprgC4CeAFAJTQAe0AvNAIwDcqAvkA
**Related Issues:** None?
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