mirror of
https://github.com/vercel-labs/scriptc.git
synced 2026-10-23 06:10:02 +08:00
Chris Tate
0580460c46
- URLSearchParams iterators compile outside a for-of head - URLSearchParams can be built from [string, string] tuple pairs - querystring.stringify writes bigint values - StringDecoder accepts an encoding known only at run time - os.setPriority is lowered
40 lines
1.8 KiB
TypeScript
40 lines
1.8 KiB
TypeScript
// new StringDecoder(encoding) with an encoding known only at run time
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// normalizes it as Node does: any ASCII case of a Buffer encoding name
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// selects that decoder and `.encoding` answers the canonical name
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// (ucs2 and utf-16le are utf16le, binary is latin1), undefined and ""
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// mean utf8, and an unknown name throws a TypeError with code
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// ERR_UNKNOWN_ENCODING. Literal names keep their compile-time form.
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import { StringDecoder } from "node:string_decoder";
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const bytes = Buffer.from([0xe2, 0x82, 0xac, 0x41, 0xc3, 0xa9, 0xff, 0x00]);
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function decodeAll(encoding: string | undefined): string {
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const decoder = new StringDecoder(encoding as BufferEncoding | undefined);
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const parts: string[] = [];
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for (let i = 0; i < bytes.length; i += 3) parts.push(decoder.write(bytes.subarray(i, i + 3)));
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parts.push(decoder.end());
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return `${decoder.encoding} ${JSON.stringify(parts)}`;
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}
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const names = [
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"utf8", "UTF-8", "Utf8", "hex", "HEX", "base64", "Base64Url", "latin1", "BINARY",
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"ascii", "utf16le", "UTF-16LE", "ucs2", "Ucs-2", "", undefined,
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];
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for (const name of names) console.log(JSON.stringify(name), decodeAll(name));
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for (const bad of ["utf-16", "buffer", "utf 8", "latin-1"]) {
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try {
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new StringDecoder(bad as BufferEncoding);
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console.log("no throw", bad);
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} catch (error) {
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const e = error as Error & { code?: string };
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console.log(e.name, e.code, e.message);
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}
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}
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const fromOptions: { encoding?: BufferEncoding } = { encoding: "hex" };
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const viaOption = new StringDecoder(fromOptions.encoding);
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console.log(viaOption.encoding, viaOption.write(Buffer.from("hi")), viaOption.end(Buffer.from("!")));
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const literal = new StringDecoder("ucs2");
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console.log(literal.encoding, JSON.stringify(literal.write(Buffer.from([0x3d, 0xd8, 0x00, 0xde]))));
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