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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Inconsistent parameter properties initialization order depending on the target syntax with useDefineForClassFields","articleBody":"# Bug Report\r\n\r\n\u003c!--\r\n  Please fill in each section completely. Thank you!\r\n-->\r\n\r\n### 🔎 Search Terms\r\n\r\nproperties initialization esnext order initialization fields useDefineForClassFields\r\n\r\n### 🕗 Version & Regression Information\r\n\r\n\u003c!-- When did you start seeing this bug occur?\r\n\r\n\"Bugs\" that have existed in TS for a long time are very likely to be FAQs; refer to\r\n  https://github.com/Microsoft/TypeScript/wiki/FAQ#common-bugs-that-arent-bugs\r\n\r\nIf possible, please try testing the nightly version of TS to see if it's already been fixed.\r\nFor npm: `typescript@next`\r\nThis is also the 'Nightly' version in the playground: http://www.typescriptlang.org/play/?ts=Nightly\r\n\r\nNote: The TypeScript Playground can be used to try older versions of TypeScript.\r\n\r\nPlease keep and fill in the line that best applies:\r\n-->\r\n- This is the behavior in every version I tried, and I reviewed the FAQ for entries about classes\r\n\r\nRef: https://github.com/babel/babel/issues/13779\r\n\r\n### ⏯ Playground Link\r\n\r\n\u003c!--\r\n  A link to a TypeScript Playground \"Share\" link which shows this behavior\r\n\r\n  The TypeScript Workbench can be used for more complex setups, try\r\n  https://www.typescriptlang.org/dev/bug-workbench/\r\n\r\n  As a last resort, you can link to a repo, but these will be slower for us to investigate.\r\n-->\r\n[Playground link with relevant code (ES2021 target)](https://www.typescriptlang.org/play?useDefineForClassFields=true&target=8#code/HYUw7gBAxgNghgZwRAIogFgIwPZwE4AmEA3gFAQUTBwC2IEAvNNsAtjCAHQzYDmAFABd0ASwSda2AK7BBASgDc5SlBYJBeKVEHY8-AA5TMMEVAiSZggFxUpNTCDxySyigF9Sb-gEZFQA)\r\n\r\n[Playground link with relevant code (ESNext target)](https://www.typescriptlang.org/play?useDefineForClassFields=true&target=99#code/HYUw7gBAxgNghgZwRAIogFgIwPZwE4AmEA3gFAQUTBwC2IEAvNNsAtjCAHQzYDmAFABd0ASwSda2AK7BBASgDc5SlBYJBeKVEHY8-AA5TMMEVAiSZggFxUpNTCDxySyigF9Sb-gEZFQA)\r\n\r\n### 💻 Code\r\n\r\n\u003c!-- Please post the relevant code sample here as well-->\r\n```ts\r\nnew class Dashboard {\r\n    name = console.log(this.amount);\r\n    constructor(public amount: number) {\r\n    }\r\n}(1);\r\n```\r\n\r\n### 🙁 Actual behavior\r\n\r\nWhen targeting ES2021 `this.amount` is initialized first; when targeting ESNext `this.name` is initialized first.\r\n\r\n### 🙂 Expected behavior\r\n\r\nThey should be consistent.","author":{"url":"https://github.com/nicolo-ribaudo","@type":"Person","name":"nicolo-ribaudo"},"datePublished":"2021-09-21T21:09:01Z","url":"https://github.com/microsoft/TypeScript/issues/45995"}