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Chris Tate
4abd8e4fff
- createRequire(import.meta.url) (or __filename / import.meta.filename) in a const binding is compile-time plumbing that emits nothing; each require call through it resolves per site against the binding's own file, and the inline createRequire(import.meta.url)("spec") spelling erases identically
- The erasure per target: a builtin spec makes the binding a namespace import in const clothing (namespace, destructured, and inline-member spellings all key the existing module tables, with the fallback-typed 'as typeof import(...)' cast idiom stripped); a relative .json document validates at compile time and lowers to json.parse over its baked text (JSON.parse's checked-dynamic unknown stance — exactly Node's value); a bare name nothing installed resolves compiles to Node's catchable MODULE_NOT_FOUND throw (the optional-dependency try/require pattern); an installed npm package embeds under --dynamic through the island's NEW require-condition entry (NpmGraphBuilder.addRequire — a dual package answers its CJS arm, exactly Node's createRequire) and reports the requires-dynamic diagnostic in a static build
- Dynamic specifiers, '#' project imports, relative non-.json targets, --npm-static opt-ins, and non-this-file bases all fence by name; the island-handle rescue skips the plumbing decls so --dynamic builds erase them too
- module.builtinModules bakes as Node v24's exact list (a fresh string[] per read, pinned to the compat target so emitted programs stay host-independent); isBuiltin and syncBuiltinESMExports fence per site with pointed hints, and the createRequire hint, its diagnostics snapshot, the surface manifest, and the npm-static offender wording follow
- Corpus 2606 pins json/builtin/builtinModules/MODULE_NOT_FOUND differentially on both backends and under ASan; the npm create-require fixture case pins cjszoo's module.exports, dual's require-condition CJS arm, and the missing-package rejection against Node
30 lines
1.2 KiB
TypeScript
30 lines
1.2 KiB
TypeScript
// @dynamic
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// createRequire over INSTALLED packages: the require resolves under
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// Node's "require" condition at build time — a CJS package's value IS
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// module.exports (the lexed facade's default), a dual package answers
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// its CJS arm (where the import condition would load the ESM arm), and
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// a bare name nothing installed resolves throws Node's catchable
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// MODULE_NOT_FOUND at the call.
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import { createRequire } from "node:module";
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const require = createRequire(import.meta.url);
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// A plain CJS package: module.exports members through the island.
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const zoo = require("cjszoo") as any;
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console.log("zoo:", zoo.alpha as string, zoo.extra as string, zoo.gamma() as string);
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// The dual package: "exports" splits import/require — require() loads
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// the CJS arm, exactly Node's createRequire.
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const dual = require("dual") as any;
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console.log("dual:", dual.flavor as string);
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// Missing package: catchable MODULE_NOT_FOUND (the optional-dependency
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// try/require pattern).
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try {
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require("definitely-not-installed-here");
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console.log("SHOULD NOT PRINT");
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} catch (e) {
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const err = e as NodeJS.ErrnoException;
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console.log("missing:", err.code, `${err.message}`.split("\n")[0]);
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}
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