process.stdin.on(data/end): SC0001 for Buffer listener, setEncoding silently ignored #3530

scriptc 0.4.11, main at 918d80b, macOS arm64.

Two problems with process.stdin as an event emitter.

1. Typed Buffer listener is refused:

const chunks: Buffer[] = [];
process.stdin.on("data", (c: Buffer) => chunks.push(c));
process.stdin.on("end", () => console.log(Buffer.concat(chunks).length));

Actual: SC0001: No overload matches this call ... Argument of type '"data"' is not assignable to parameter of type '"keypress"'. The fallback declarations in packages/compiler/ambient/scriptc-node-fallback.d.ts (stdin, around lines 401-470) lack the data/end overloads.

2. Silent miscompile with setEncoding:

let buf = "";
process.stdin.setEncoding("utf8");
process.stdin.on("data", (c) => { buf += c; console.error(typeof c); });
process.stdin.on("end", () => console.log(JSON.stringify(buf)));

echo '{"a":1}' | ./out prints object and "123,34,97,34,58,49,125,10". Expected string and "{\\"a\\":1}\\n". The build succeeds with no diagnostic, so setEncoding is ignored and chunks stay byte arrays.

for await (const c of process.stdin) with Buffer.concat works.

Expected: either lower both forms or refuse setEncoding loudly. Related: #3352, #3427, #3445.