commander 15 help.js: SC2001 deferred sites, --help throws at runtime

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Issue 类型
缺陷
描述清晰度
基本清楚
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活跃
技术栈
typescript

调研方向

Start by reading the compiler's handling of deferred sites and diagnostics, then inspect how it processes the reported sites in dependency file help.js from [email protected]; the issue does not identify the corresponding scriptc source files or tests. Reproduce with the supplied TypeScript example and scriptc coverage cmd.ts, then use --explain-island=commander to inspect the deferred sites. Done means --help runs successfully, or the build reports an actionable error instead of producing a runtime throw.

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描述

scriptc 0.4.11, main at 918d80b26a, macOS arm64.

[email protected] does not compile statically. Repro with a project that has commander installed:

import { Command } from "commander";
const p = new Command();
p.name("x").option("-a, --all", "all").action(() => console.log("run"));
p.parse(process.argv);

scriptc coverage cmd.ts reports 99% static, then:

  • lib/help.js:50:39 SC2001: values of type 'string' cannot be compiled yet ... (instantiating 'vis...')
  • lib/help.js:132:26 SC2001: values of type '(a: Option, b: Option) => number' cannot be compiled yet
  • 8 sites deferred to runtime (JS statements that throw their fence if executed), +6 more reasons in 1 module (--explain-island=commander).

Impact: the build succeeds, but --help hits a deferred site and throws at runtime. The SC1090 diagnostic also appears for this module when built without islands.

Expected: help.js compiles, or the build refuses rather than deferring. The hint "restate the value's type" is not actionable inside node_modules; a note that the site is in a dependency would help.

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