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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"useDefineWithClassFields should use-before-init error when class property initializer refers to parameter property","articleBody":"# Bug Report\r\n\r\nThis bug exists in my project, not only playground, but playground seem to also have bugs, because i can't even seem to reliably reproduce it in the playground – sometimes it does not react on `Target` change. But right now i have an opened playground tab with this bug.\r\n\r\nI will duplicate the MRE code right here as a text.\r\nThis is the source code\r\n\r\n```typescript\r\nclass Helper {\r\n    create(): boolean {\r\n        return true\r\n    }\r\n}\r\n\r\nexport class Broken {\r\n\r\n    constructor(readonly facade: Helper) {\r\n        console.log(this.bug)\r\n    }\r\n    bug = this.facade.create()\r\n\r\n}\r\n\r\nnew Broken(new Helper)\r\n```\r\n\r\nThis is the compiled code with `target: ES2022` and `module: CommonJS`\r\n\r\n```js\r\n\"use strict\";\r\nObject.defineProperty(exports, \"__esModule\", { value: true });\r\nexports.Broken = void 0;\r\nclass Helper {\r\n    create() {\r\n        return true;\r\n    }\r\n}\r\nclass Broken {\r\n    facade;\r\n    constructor(facade) {\r\n        this.facade = facade;\r\n        console.log(this.bug);\r\n    }\r\n    bug = this.facade.create();\r\n}\r\nexports.Broken = Broken;\r\nnew Broken(new Helper);\r\n```\r\n\r\nIf run this JS – we will get TypeError\r\n\r\n```error\r\nCannot read properties of undefined (reading 'create') \r\n```\r\n\r\n### ⏯ Playground Link\r\n\r\n[Playground link with relevant code](https://www.typescriptlang.org/play?target=9&module=1&ts=4.8.2&noImplicitUseStrict=true#code/MYGwhgzhAEASCmIAO8BO0DeAoavrFXjABd4AKASgC5oAjAe3pCIDtMc9PDiBXVN4qh7wOuAL5YJWeAA8k9VMXzgo0AEKp6Aa3htso-PRYRBPYMQVlCYACZGQAT2gAzMMFvwaCZGgrtOnMBGEEzwAHQg9ADmZMQAFgCWEGG0PFEUBhKcqVHQALzQ8Ulhru424QREpJRYkrVYLPAA7uqaOixkjS3eKKgUQA)\r\n\r\n\r\nI'm also sharing the playground link, but i assume it could produce the right code for you if you open it first time.\r\nTo reliable reproduce – change `module` to `Node16` and then to `CommonJS`. You should see this result\r\n\r\n\u003cimg width=\"959\" alt=\"Screen Shot 2022-09-27 at 19 54 16\" src=\"https://user-images.githubusercontent.com/9336742/192588709-e036c3cf-6cdc-4aa6-b070-85d267a4862a.png\">\r\n","author":{"url":"https://github.com/dilame","@type":"Person","name":"dilame"},"datePublished":"2022-09-27T16:55:57Z","url":"https://github.com/microsoft/TypeScript/issues/50971"}