add side effects test cases

test/cases/side-effects/dynamic-reexports/dedupe-target-static/a.js

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+export * from "./module";
+if (process.env.NODE_ENV !== "development")
+	throw new Error("Should not be loaded");

test/cases/side-effects/dynamic-reexports/dedupe-target-static/b.js

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+export * from "./module";

test/cases/side-effects/dynamic-reexports/dedupe-target-static/index.js

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+export * from "./a";
+export * from "./b";

test/cases/side-effects/dynamic-reexports/dedupe-target-static/module.js

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+export const value = 42;

test/cases/side-effects/dynamic-reexports/dedupe-target/a.js

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+export * from "./empty";
+if (process.env.NODE_ENV !== "development")
+	throw new Error("Should not be loaded");

test/cases/side-effects/dynamic-reexports/dedupe-target/b.js

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+export * from "./empty";

test/cases/side-effects/dynamic-reexports/dedupe-target/index.js

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+export * from "./a";
+export * from "./b";

test/cases/side-effects/dynamic-reexports/default-export/a.js

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+export default 42;

test/cases/side-effects/dynamic-reexports/default-export/b.js

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+module.exports = 42;

test/cases/side-effects/dynamic-reexports/default-export/index.js

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+export { default as a } from "./a";
+export { default as b } from "./b";
+export { default as empty } from "./empty";
+export { default as json } from "./json";
+
+if (process.env.NODE_ENV !== "development")
+	throw new Error("Should not be loaded");

test/cases/side-effects/dynamic-reexports/default-export/json.json

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+42

test/cases/side-effects/dynamic-reexports/index.js

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+import { value as valueStatic } from "./dedupe-target-static";
+import { value } from "./dedupe-target";
+import * as DefaultExport from "./default-export";
+
+it("should dedupe static reexport target", () => {
+	expect(valueStatic).toBe(42);
+});
+
+it("should dedupe dynamic reexport target", () => {
+	expect(value).toBe(undefined);
+});
+
+it("should optimize dynamic default reexport", () => {
+	expect(DefaultExport.a).toBe(42);
+	expect(DefaultExport.b).toBe(42);
+	expect(DefaultExport.empty).toEqual({});
+	expect(DefaultExport.json).toBe(42);
+});
+
+it("should handle default export when reexporting", () => {
+	const module = Object(require("./reexports-excludes-default"));
+	expect(module.test).toBe(true);
+});

test/cases/side-effects/dynamic-reexports/package.json

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+{
+  "sideEffects": false
+}

test/cases/side-effects/dynamic-reexports/reexports-excludes-default/index.js

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+export * from "./module";

test/cases/side-effects/dynamic-reexports/reexports-excludes-default/module.js

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+export * from "./empty";
+export const test = true;

test/cases/side-effects/dynamic-reexports/unused.js

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+export const value = 42;
+export const unused = __webpack_exports_info__.value.used;
+export const unprovided = __webpack_exports_info__.other.provideInfo;