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node_entry.mjs

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node_entry.mjs

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import EmscriptenModule from "./python.mjs";
import fs from "node:fs";
import { initializeStreams } from "./streams.mjs";
if (process?.versions?.node) {
const nodeVersion = Number(process.versions.node.split(".", 1)[0]);
if (nodeVersion < 18) {
process.stderr.write(
`Node version must be >= 18, got version ${process.version}\n`,
);
process.exit(1);
}
}
function rootDirsToMount(Module) {
return fs
.readdirSync("/")
.filter((dir) => !["dev", "lib", "proc"].includes(dir))
.map((dir) => "/" + dir);
}
function mountDirectories(Module) {
for (const dir of rootDirsToMount(Module)) {
Module.FS.mkdirTree(dir);
Module.FS.mount(Module.FS.filesystems.NODEFS, { root: dir }, dir);
}
}
const thisProgram = "--this-program=";
const thisProgramIndex = process.argv.findIndex((x) =>
x.startsWith(thisProgram),
);
const settings = {
preRun(Module) {
// Globally expose API object so we can access it if we raise on startup.
globalThis.Module = Module;
mountDirectories(Module);
Module.FS.chdir(process.cwd());
Object.assign(Module.ENV, process.env);
delete Module.ENV.PATH;
},
onRuntimeInitialized() {
initializeStreams(Module.FS);
},
// Ensure that sys.executable, sys._base_executable, etc point to python.sh
// not to this file. To properly handle symlinks, python.sh needs to compute
// its own path.
thisProgram: process.argv[thisProgramIndex].slice(thisProgram.length),
// After python.sh come the arguments thatthe user passed to python.sh.
arguments: process.argv.slice(thisProgramIndex + 1),
};
try {
await EmscriptenModule(settings);
} catch (e) {
// Show JavaScript exception and traceback
console.warn(e);
// Show Python exception and traceback
Module.__Py_DumpTraceback(2, Module._PyGILState_GetThisThreadState());
process.exit(1);
}
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