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fix: add explicit zlib constant fallbacks for esbuild-stripped values #26

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Merged
NathanFlurry merged 1 commit into from
Mar 26, 2026
Merged

fix: add explicit zlib constant fallbacks for esbuild-stripped values #26

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32 changes: 30 additions & 2 deletions packages/core/isolate-runtime/src/inject/require-setup.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -300,15 +300,43 @@
// constants object. Node.js zlib.constants bundles all Z_ values plus
// DEFLATE (1), INFLATE (2), GZIP (3), DEFLATERAW (4), INFLATERAW (5),
// UNZIP (6), GUNZIP (7). Packages like ssh2 destructure constants.
var zlibConstants = typeof result.constants === 'object' && result.constants !== null
? result.constants
: {};
if (typeof result.constants !== 'object' || result.constants === null) {
var zlibConstants = {};
var constKeys = Object.keys(result);
for (var ci = 0; ci < constKeys.length; ci++) {
var ck = constKeys[ci];
if (ck.indexOf('Z_') === 0 && typeof result[ck] === 'number') {
zlibConstants[ck] = result[ck];
}
}
// Add Z_* constants that esbuild may strip from the browserify-zlib bundle.
if (typeof zlibConstants.Z_NO_FLUSH !== 'number') zlibConstants.Z_NO_FLUSH = 0;
if (typeof zlibConstants.Z_PARTIAL_FLUSH !== 'number') zlibConstants.Z_PARTIAL_FLUSH = 1;
if (typeof zlibConstants.Z_SYNC_FLUSH !== 'number') zlibConstants.Z_SYNC_FLUSH = 2;
if (typeof zlibConstants.Z_FULL_FLUSH !== 'number') zlibConstants.Z_FULL_FLUSH = 3;
if (typeof zlibConstants.Z_FINISH !== 'number') zlibConstants.Z_FINISH = 4;
if (typeof zlibConstants.Z_BLOCK !== 'number') zlibConstants.Z_BLOCK = 5;
if (typeof zlibConstants.Z_TREES !== 'number') zlibConstants.Z_TREES = 6;
if (typeof zlibConstants.Z_OK !== 'number') zlibConstants.Z_OK = 0;
if (typeof zlibConstants.Z_STREAM_END !== 'number') zlibConstants.Z_STREAM_END = 1;
if (typeof zlibConstants.Z_NEED_DICT !== 'number') zlibConstants.Z_NEED_DICT = 2;
if (typeof zlibConstants.Z_ERRNO !== 'number') zlibConstants.Z_ERRNO = -1;
if (typeof zlibConstants.Z_STREAM_ERROR !== 'number') zlibConstants.Z_STREAM_ERROR = -2;
if (typeof zlibConstants.Z_DATA_ERROR !== 'number') zlibConstants.Z_DATA_ERROR = -3;
if (typeof zlibConstants.Z_MEM_ERROR !== 'number') zlibConstants.Z_MEM_ERROR = -4;
if (typeof zlibConstants.Z_BUF_ERROR !== 'number') zlibConstants.Z_BUF_ERROR = -5;
if (typeof zlibConstants.Z_VERSION_ERROR !== 'number') zlibConstants.Z_VERSION_ERROR = -6;
if (typeof zlibConstants.Z_NO_COMPRESSION !== 'number') zlibConstants.Z_NO_COMPRESSION = 0;
if (typeof zlibConstants.Z_BEST_SPEED !== 'number') zlibConstants.Z_BEST_SPEED = 1;
if (typeof zlibConstants.Z_BEST_COMPRESSION !== 'number') zlibConstants.Z_BEST_COMPRESSION = 9;
if (typeof zlibConstants.Z_DEFAULT_COMPRESSION !== 'number') zlibConstants.Z_DEFAULT_COMPRESSION = -1;
if (typeof zlibConstants.Z_FILTERED !== 'number') zlibConstants.Z_FILTERED = 1;
if (typeof zlibConstants.Z_HUFFMAN_ONLY !== 'number') zlibConstants.Z_HUFFMAN_ONLY = 2;
if (typeof zlibConstants.Z_RLE !== 'number') zlibConstants.Z_RLE = 3;
if (typeof zlibConstants.Z_FIXED !== 'number') zlibConstants.Z_FIXED = 4;
if (typeof zlibConstants.Z_DEFAULT_STRATEGY !== 'number') zlibConstants.Z_DEFAULT_STRATEGY = 0;
// Add mode constants that Node.js exposes but browserify-zlib does not.
if (typeof zlibConstants.DEFLATE !== 'number') zlibConstants.DEFLATE = 1;
if (typeof zlibConstants.INFLATE !== 'number') zlibConstants.INFLATE = 2;
Expand All @@ -317,8 +345,8 @@
if (typeof zlibConstants.INFLATERAW !== 'number') zlibConstants.INFLATERAW = 5;
if (typeof zlibConstants.UNZIP !== 'number') zlibConstants.UNZIP = 6;
if (typeof zlibConstants.GUNZIP !== 'number') zlibConstants.GUNZIP = 7;
result.constants = zlibConstants;
}
result.constants = zlibConstants;
return result;
}

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2 changes: 1 addition & 1 deletion packages/core/src/generated/isolate-runtime.ts
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63 changes: 63 additions & 0 deletions packages/secure-exec/tests/test-suite/node/polyfills.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,69 @@ export function runNodePolyfillSuite(context: NodeSuiteContext): void {
});
});

it("zlib.constants has flush, return-code, level, and strategy constants", async () => {
const runtime = await context.createRuntime();
const result = await runtime.run(`
const zlib = require('zlib');
const c = zlib.constants;
module.exports = {
Z_NO_FLUSH: c.Z_NO_FLUSH,
Z_PARTIAL_FLUSH: c.Z_PARTIAL_FLUSH,
Z_SYNC_FLUSH: c.Z_SYNC_FLUSH,
Z_FULL_FLUSH: c.Z_FULL_FLUSH,
Z_FINISH: c.Z_FINISH,
Z_BLOCK: c.Z_BLOCK,
Z_TREES: c.Z_TREES,
Z_OK: c.Z_OK,
Z_STREAM_END: c.Z_STREAM_END,
Z_NEED_DICT: c.Z_NEED_DICT,
Z_ERRNO: c.Z_ERRNO,
Z_STREAM_ERROR: c.Z_STREAM_ERROR,
Z_DATA_ERROR: c.Z_DATA_ERROR,
Z_MEM_ERROR: c.Z_MEM_ERROR,
Z_BUF_ERROR: c.Z_BUF_ERROR,
Z_VERSION_ERROR: c.Z_VERSION_ERROR,
Z_NO_COMPRESSION: c.Z_NO_COMPRESSION,
Z_BEST_SPEED: c.Z_BEST_SPEED,
Z_BEST_COMPRESSION: c.Z_BEST_COMPRESSION,
Z_DEFAULT_COMPRESSION: c.Z_DEFAULT_COMPRESSION,
Z_FILTERED: c.Z_FILTERED,
Z_HUFFMAN_ONLY: c.Z_HUFFMAN_ONLY,
Z_RLE: c.Z_RLE,
Z_FIXED: c.Z_FIXED,
Z_DEFAULT_STRATEGY: c.Z_DEFAULT_STRATEGY,
};
`);
expect(result.code).toBe(0);
expect(result.exports).toEqual({
Z_NO_FLUSH: 0,
Z_PARTIAL_FLUSH: 1,
Z_SYNC_FLUSH: 2,
Z_FULL_FLUSH: 3,
Z_FINISH: 4,
Z_BLOCK: 5,
Z_TREES: 6,
Z_OK: 0,
Z_STREAM_END: 1,
Z_NEED_DICT: 2,
Z_ERRNO: -1,
Z_STREAM_ERROR: -2,
Z_DATA_ERROR: -3,
Z_MEM_ERROR: -4,
Z_BUF_ERROR: -5,
Z_VERSION_ERROR: -6,
Z_NO_COMPRESSION: 0,
Z_BEST_SPEED: 1,
Z_BEST_COMPRESSION: 9,
Z_DEFAULT_COMPRESSION: -1,
Z_FILTERED: 1,
Z_HUFFMAN_ONLY: 2,
Z_RLE: 3,
Z_FIXED: 4,
Z_DEFAULT_STRATEGY: 0,
});
});

it("zlib.constants has mode constants (DEFLATE=1..GUNZIP=7)", async () => {
const runtime = await context.createRuntime();
const result = await runtime.run(`
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