55 lines
2.0 KiB
TypeScript
55 lines
2.0 KiB
TypeScript
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import { expect, it } from "vitest";
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import { analyzeJavaScriptStaticSource } from "./javascriptStaticAnalysis.js";
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/**
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* A `createRequire` loader saved under a member literally named `require` is still
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* the same loader. The deferred path used to drop the loader identity, so the
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* specifier of a factory or `create-require` module key read as an external package.
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*
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* Measured shape:
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*
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* import { createRequire } from "node:module";
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* const holder = { require: createRequire(import.meta.url) };
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* holder.require("x"); -> a `create-require` load of "x"
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*
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* A plain `module.require` member is the CommonJS loader, so it stays unqualified.
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*/
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const referencesFor = (source: string) =>
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(analyzeJavaScriptStaticSource(source).references ?? []).map(
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({ kind, specifier, loader }) => ({ kind, specifier, loader }),
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);
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it("forwards createRequire through a member named require", () => {
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expect(
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referencesFor(
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`import { createRequire } from "node:module";
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const holder = { require: createRequire(import.meta.url) };
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holder.require("x");`,
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),
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).toEqual([
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{ kind: "static-import", specifier: "node:module", loader: undefined },
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{ kind: "require", specifier: "x", loader: "create-require" },
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]);
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});
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it("forwards a destructured require member alias", () => {
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expect(
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referencesFor(
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`import { createRequire } from "node:module";
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const { require: load } = { require: createRequire(import.meta.url) };
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load("y");`,
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),
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).toEqual([
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{ kind: "static-import", specifier: "node:module", loader: undefined },
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{ kind: "require", specifier: "y", loader: "create-require" },
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]);
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});
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it("keeps a module.require member unqualified", () => {
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// A bare snippet has no `module` binding, so the specifier stays unresolved; what
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// this pins is that the deferred path does not invent a loader identity for it.
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expect(referencesFor(`const load = module.require; load("z");`)).toEqual([
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{ kind: "require", specifier: null, loader: undefined },
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]);
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});
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