Misleading error message for duplicate CLI flags

Bug Report

🔎 Search Terms

tsc multiple flag options cli

🕗 Version & Regression Information

• This is the behavior in every version I tried, and I reviewed the FAQ for entries about CLI option parsing

⏯ Playground Link

N/A

💻 Code

Any of:

tsc -b -b
tsc -b --build
tsc -b --clean --build

🙁 Actual behavior

tsc -b -b      
error TS5072: Unknown build option '-b'.

🙂 Expected behavior

Something indicating the flag was provided twice, not that it's unknown?

tsc -b -b      
error TS5072: Duplicate build option '-b' provided.

首先使用报告中的命令跟踪 TypeScript 的 CLI 选项解析：tsc -b -b、tsc -b --build 和 tsc -b --clean --build。将当前诊断与预期的重复选项措辞进行比较；当重复的 build 标志被报告为重复项而不是未知选项时，即表示完成。