test/configCases/optimization/static-export-bindings/index.js - main - githubmirror/webpack

test/configCases/optimization/static-export-bindings/index.js
195 строк7 KB
Xiao
fix: extend value binding to export default expressions (#21117)
07 июн 2026, 20:14
07 июн 2026, 20:14b0b716e
import * as constExports from "./const-exports";
import * as fnExports from "./function-exports";
import * as mutableExports from "./mutable-exports";
import * as cycleA from "./cycle-a";
import * as reexported from "./reexport";
import * as reexportChain from "./reexport-chain";
import * as reexportMixed from "./reexport-mixed";
import * as reexportStar from "./reexport-star";
import * as reexportCircular from "./reexport-circular";
import * as defaultBinding from "./default-binding";
import * as constDefault from "./const-default";
import * as defaultExpr from "./default-expr";
import * as defaultFnDecl from "./default-fn-decl";
import * as defaultFnAnon from "./default-fn-anon";
import * as starMutable from "./star-mutable";
import * as selfConst from "./self-const";
import * as mutableForms from "./mutable-forms";

function expectValueDescriptor(ns, key) {
	const descriptor = Object.getOwnPropertyDescriptor(ns, key);
	expect(descriptor.get).toBe(undefined);
	expect(descriptor.enumerable).toBe(true);
	expect(descriptor.writable).toBe(false);
}

function expectGetterDescriptor(ns, key) {
	const descriptor = Object.getOwnPropertyDescriptor(ns, key);
	expect(typeof descriptor.get).toBe("function");
	expect(descriptor.enumerable).toBe(true);
	expect(Object.prototype.hasOwnProperty.call(descriptor, "value")).toBe(false);
}

// === Direct exports ===

it("should bind const exports as readonly values (non-circular)", () => {
	expectValueDescriptor(constExports, "literal");
	expect(constExports.literal).toBe("literal");
	expectValueDescriptor(constExports, "renamed");
	expect(constExports.renamed).toBe("local");
	expectValueDescriptor(constExports, "destructured");
	expect(constExports.destructured).toBe("destructured");
	expectValueDescriptor(constExports, "arrayValue");
	expect(constExports.arrayValue).toBe("array");
	expectValueDescriptor(constExports, "string-alias");
	expect(constExports["string-alias"]).toBe("aliased");
});

it("should keep function exports as getters", () => {
	expectGetterDescriptor(fnExports, "fn");
	expect(fnExports.fn()).toBe("fn");
	expectGetterDescriptor(fnExports, "fn2");
	expect(fnExports.fn2()).toBe("fn2");
});

it("should keep mutable exports as getters", () => {
	expectGetterDescriptor(mutableExports, "counter");
	expect(mutableExports.counter).toBe(0);
	mutableExports.increment();
	expect(mutableExports.counter).toBe(1);
});

it("should work correctly with circular modules", () => {
	expect(cycleA.cyclicConst).toBe("cyclic");
	expect(cycleA.readViaB()).toBe("cyclic");
});

// === Re-exports (all use getters — re-export optimization not yet supported) ===

it("should keep re-exported const as getter", () => {
	expectGetterDescriptor(reexported, "literal");
	expect(reexported.literal).toBe("literal");
});

it("should keep re-exported function as getter", () => {
	expectGetterDescriptor(reexported, "fn");
	expect(reexported.fn()).toBe("fn");
});

it("should keep re-exported mutable as getter with live binding", () => {
	expectGetterDescriptor(reexported, "counter");
	const before = reexported.counter;
	reexported.increment();
	expect(reexported.counter).toBe(before + 1);
});

it("should use getter for multi-level re-export chain", () => {
	expectGetterDescriptor(reexportChain, "chainedLiteral");
	expect(reexportChain.chainedLiteral).toBe("literal");
});

it("should bind own const as value in mixed module", () => {
	expectValueDescriptor(reexportMixed, "ownConst");
	expect(reexportMixed.ownConst).toBe("own");
});

it("should keep re-exported values in mixed module", () => {
	expect(reexportMixed.reConst).toBe("literal");
	expect(reexportMixed.reFn()).toBe("fn");
});

it("should keep re-exported mutable as live binding in mixed module", () => {
	const before = reexportMixed.reCounter;
	reexportMixed.reIncrement();
	expect(reexportMixed.reCounter).toBe(before + 1);
});

it("should use getter for named re-export with export *", () => {
	expectGetterDescriptor(reexportStar, "namedConst");
	expect(reexportStar.namedConst).toBe("literal");
});

it("should keep star-exported function as getter", () => {
	expectGetterDescriptor(reexportStar, "fn");
	expect(reexportStar.fn()).toBe("fn");
});

it("should use getter for re-export from circular module", () => {
	expectGetterDescriptor(reexportCircular, "reCircular");
	expect(reexportCircular.reCircular).toBe("cyclic");
});

// === Live-binding edge cases ===

it("should keep `export { let as default }` as a live binding", () => {
	expectGetterDescriptor(defaultBinding, "default");
	expect(defaultBinding.default).toBe(0);
	defaultBinding.bumpDefault();
	expect(defaultBinding.default).toBe(1);
});

it("should bind `export { const as default }` as a value", () => {
	expectValueDescriptor(constDefault, "default");
	expect(constDefault.default).toBe("const-default");
});

it("should bind `export default expression` as a value", () => {
	expectValueDescriptor(defaultExpr, "default");
	expect(defaultExpr.default).toBe(42);
});

it("should keep `export default function fn(){}` as getter", () => {
	expectGetterDescriptor(defaultFnDecl, "default");
	expect(defaultFnDecl.default()).toBe("default-fn");
});

it("should keep `export default function(){}` as getter", () => {
	expectGetterDescriptor(defaultFnAnon, "default");
	expect(defaultFnAnon.default()).toBe("default-anon");
});

it("should keep mutable binding live through `export *`", () => {
	expectGetterDescriptor(starMutable, "counter");
	const before = starMutable.counter;
	starMutable.increment();
	expect(starMutable.counter).toBe(before + 1);
});

it("should keep mutable binding live through a two-hop re-export chain", () => {
	expectGetterDescriptor(reexportChain, "chainedCounter");
	const before = reexportChain.chainedCounter;
	reexportChain.chainedIncrement();
	expect(reexportChain.chainedCounter).toBe(before + 1);
});

it("should fall back to getter for const in a self-cycle and read correctly", () => {
	expectGetterDescriptor(selfConst, "selfConst");
	expect(selfConst.selfConst).toBe("self");
	expect(selfConst.readSelf()).toBe("self");
});

it("should observe every mutation form (assign, compound, update) as live", () => {
	expect(mutableForms.viaAssign).toBe(1);
	expect(mutableForms.viaCompound).toBe(1);
	expect(mutableForms.viaUpdate).toBe(1);
	mutableForms.mutateAll();
	expect(mutableForms.viaAssign).toBe(10);
	expect(mutableForms.viaCompound).toBe(6);
	expect(mutableForms.viaUpdate).toBe(2);
});

it("should enumerate value-bound and getter exports together", () => {
	expect(Object.keys(mutableForms).sort()).toEqual([
		"mutateAll",
		"viaAssign",
		"viaCompound",
		"viaUpdate"
	]);
	expect(Object.keys(constExports).sort()).toEqual([
		"arrayValue",
		"destructured",
		"literal",
		"renamed",
		"string-alias"
	]);
});