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Malte UblandClaude Opus 5.5
2b03f66ff3
Reading `process.stdout.write` as a value, `write.bind(stream)`, and `process.stdout.write = fn` now reach the runtime stream object's write slot in TypeScript, and a program that replaces an output write method calls its typed writes through that slot (SC8020 refuses the combination with Node islands until H2 shares the stream object with them). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
43 lines
2.0 KiB
TypeScript
43 lines
2.0 KiB
TypeScript
// Replacing process.stdout.write from TypeScript: the output-guard idiom.
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// The real write methods are taken first with bind (they write straight
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// to the descriptor, past any later patch). The replacement then sees
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// every stdout write: console.log's lines, direct string and byte writes
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// with their encoding and callback arguments as passed. Assigning the
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// saved method back restores the stream.
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type RawWrite = (chunk: string, callback?: (error?: Error | null) => void) => boolean;
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const rawStdout = process.stdout.write.bind(process.stdout) as RawWrite;
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const rawStderr = process.stderr.write.bind(process.stderr) as RawWrite;
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const original = process.stdout.write;
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const captured: string[] = [];
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function text(chunk: string | Uint8Array): string {
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return typeof chunk === "string" ? chunk : new TextDecoder().decode(chunk);
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}
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process.stdout.write = ((
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chunk: string | Uint8Array,
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encodingOrCallback?: BufferEncoding | ((error?: Error | null) => void),
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callback?: (error?: Error | null) => void,
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): boolean => {
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const done = typeof encodingOrCallback === "function" ? encodingOrCallback : callback;
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const encoding = typeof encodingOrCallback === "string" ? encodingOrCallback : "-";
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captured.push(`${typeof chunk === "string" ? "string" : "bytes"}/${encoding}:${text(chunk).trimEnd()}`);
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return rawStderr(`[redirected] ${text(chunk)}`, done);
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}) as typeof process.stdout.write;
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console.log("from console.log", 42);
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process.stdout.write("direct string\n");
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process.stdout.write(new Uint8Array([104, 105, 10]));
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process.stdout.write("6869210a", "hex");
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process.stdout.write("with callback\n", (error) => {
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rawStderr(`callback error is null: ${error === null}\n`);
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});
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const accepted = process.stdout.write("result\n");
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rawStdout("raw stdout bypasses the patch\n");
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console.log("same method", process.stdout.write === original, accepted);
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process.stdout.write = original;
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console.log("restored", process.stdout.write === original);
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console.log(captured.join(" | "));
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