Option to disable decorator transform

Search Terms

decorator output

Suggestion

Decorators are always transformed. In some cases we critically need to preserve decorators in the output to feed into other tools, such as Babel.

All the other issues around this are closed, so I can't see what the plan is here. Adding a new flag to disable decorator transformation should be forward and backward compatible with any other implementation of decorators, old or new proposal.

Use Cases

• Use Babel 7 decorator support to compile the current decorator proposal
• Feed tsc output into other analysis tools that expect decorators in JS source.

Examples

Checklist

My suggestion meets these guidelines:

• This wouldn't be a breaking change in existing TypeScript/JavaScript code
• This wouldn't change the runtime behavior of existing JavaScript code
• This could be implemented without emitting different JS based on the types of the expressions
• This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, etc.)
• This feature would agree with the rest of TypeScript's Design Goals.

まず、既存のデコレーター変換の動作とコンパイラーオプションの規約を確認します。tsc の出力が Babel 7 やその他の解析ツールでどのように利用されているかを確認し、その後、デコレーターを保持するためのフラグの動作を定義して、既存のデコレーター実装との互換性を検証します。