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Malte UblandClaude Opus 5.5
f176de2124
A package that exports a constructor function whole and also as a named member (`exports = module.exports = Client; exports.StatsD = Client`, the statsd-client shape) could not be constructed from TypeScript: `new StatsD(...)` was refused as "constructing values other than classes declared in the program", and a bare reference had "no lowering".
- `exports = module.exports = value` is now the module's whole export, and it rebinds `exports` too, so members attached through `exports` afterwards are exported. The fresh-table reset `exports = module.exports = {}` keeps its own handling.
- An `import { name }` or a top-level `const { name } = require(...)` of a member written once as `exports.<name> = <binding or primitive literal>` on such a module reads that value, following `module.exports = require("./x")` re-exports. The checker gives these bindings a synthesized property symbol, so the module's statements answer.
- Construction then takes the existing checked path for JavaScript functions: prototype methods, `util.inherits` between two constructor functions, and `Parent.call(this, ...)` behave as in Node.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
20 lines
924 B
TypeScript
20 lines
924 B
TypeScript
// Constructing a CommonJS constructor-function "class" imported by a named
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// member alias (`exports = module.exports = Client; exports.StatsD =
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// Client`) through a re-exporting package index: prototype methods, a child
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// client linked with util.inherits, and a callback-style close.
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import { StatsD } from "metrics-client";
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const client = new StatsD({ prefix: "app." });
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client.onSent((line: string) => console.log("event", line));
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console.log(client.increment("boot"));
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console.log(client.gauge("heap", 42));
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console.log(typeof client.increment, typeof client.onSent);
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const child = client.childClient({ prefix: "db." });
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console.log(child.increment("query", 3));
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console.log(child.gauge("pool", 1), child.sent.length, client.sent.length);
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const bare = new StatsD();
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console.log(bare.increment("x"), bare.sent.length);
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client.close((error: Error | null, count: number) => {
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console.log("closed", error, count);
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});
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