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Malte UblandClaude Opus 5.5
9e63a937db
`Buffer.isBuffer` over a Uint8Array-typed value (safe-buffer's
`Buffer.from(...)` result, etag's input) refused at compile time because
the bytes IR shares storage between Buffer and Uint8Array. The view keeps
its Buffer brand at run time, so the test now reads it.
`require('buffer').Buffer`, `const { Buffer } = require('buffer')` and
`buffer.Buffer` through a namespace binding alias the global Buffer (the
module member is the same constructor), so their statics lower like the
global's. A file-scope `var` of the namespace form aliases too when nothing
reassigns it and the require-binding early-reference analysis finds no
earlier reader. `Buffer.from` over a JS-inferred `string | Uint8Array |
undefined` value takes the checked runtime form.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
26 lines
1.1 KiB
JavaScript
26 lines
1.1 KiB
JavaScript
// The buffer module's Buffer through CommonJS bindings — `var Buffer =
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// require('buffer').Buffer` and a member of a stored require — is the
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// global Buffer constructor, with its statics.
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var Buffer = require("buffer").Buffer;
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var buffer = require("buffer");
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var B2 = buffer.Buffer;
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const B3 = require("node:buffer").Buffer;
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console.log(Buffer.from("hi").toString("hex"), Buffer.isBuffer(Buffer.alloc(1)), B2.byteLength("héllo"), B2.isBuffer("x"));
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console.log(B3.concat([B2.from("a"), Buffer.from([98])]).toString(), B3.alloc(2, 1).toString("base64"));
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function toBuffer(chunk) {
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return Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk);
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}
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console.log(toBuffer("abc").length, toBuffer(Buffer.from("xyz")).toString());
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// Buffer.from over a JS-inferred `string | Uint8Array | undefined` result
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// dispatches on the runtime kind, Node's TypeError for undefined included.
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function make(flag) {
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return flag ? "ab" : flag === false ? new Uint8Array([99, 100]) : undefined;
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}
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console.log(Buffer.from(make(true)).toString(), Buffer.from(make(false)).toString("hex"));
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try {
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Buffer.from(make(null));
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} catch (e) {
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console.log(e.name, e.code);
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}
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