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28b1e5cadc | ||
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456aa4f6de | ||
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73c8b36615 | ||
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0751974d49 | ||
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3ae5ac3359 | ||
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a47517c67c |
@@ -0,0 +1,53 @@
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import { parse } from "@babel/parser";
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import { expect, it } from "vitest";
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import { collectJavaScriptExports } from "./javascriptAstFingerprint.js";
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import { analyzeJavaScriptStaticSource } from "./javascriptStaticAnalysis.js";
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it.each([
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"exports[key] = 1;",
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"module[key].value = 1;",
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'module["exports.value"] = 1;',
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"module.exports = { [key]: 1 };",
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'Object[method](exports, "value", {});',
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"function d() {} d(exports, { invented: 1 });",
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])("does not invent an export name for %s", (source) => {
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expect(collectJavaScriptExports(parse(source)).values).toEqual([]);
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});
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it.each([
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'exports[""] = 1;',
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'module.exports = { "": 1 };',
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'Object.defineProperty(exports, "", {});',
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])("preserves the exact empty export name for %s", (source) => {
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expect(collectJavaScriptExports(parse(source)).values).toEqual([""]);
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});
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it("retains static computed and ordinary names", () => {
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expect(
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collectJavaScriptExports(
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parse('module["exports"]["ready"] = 1; exports.done = 2;'),
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).values,
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).toEqual(["done", "ready"]);
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});
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it("retains member helper exports on this", () => {
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expect(
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collectJavaScriptExports(parse("this.d(exports, { ready: () => 1 });"))
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.values,
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).toEqual(["ready"]);
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});
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it("does not expose invented names in bundler module analysis", () => {
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const analysis = analyzeJavaScriptStaticSource(`
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globalThis.webpackChunkApp.push([[1], { 1: function(module, exports) {
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exports[key] = 1;
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module["exports.value"] = 2;
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module.exports = { [key]: 3, ready: 4 };
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} }]);
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`);
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expect(analysis.parse_status).toBe("complete");
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expect(analysis.bundler_registrations[0]?.modules[0]?.exports).toEqual([
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"ready",
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]);
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});
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@@ -5,7 +5,10 @@ import * as t from "@babel/types";
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import { traverseJavaScriptAst } from "./javascriptSemanticTraversal.js";
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import { compareUnicodeCodePoints } from "../unicodeCodePointOrder.js";
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import { propertyName } from "./javascriptAstValues.js";
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import {
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propertyName,
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semanticStaticPropertyKey,
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} from "./javascriptAstValues.js";
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import { stringValue } from "./javascriptStaticAnalysisHelpers.js";
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/** Static CommonJS export names. */
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@@ -71,15 +74,20 @@ const collectAssignmentExports = (
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output: Set<string>,
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): void => {
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const path = memberPath(left);
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if (path === "exports" || path === "module.exports") {
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if (path === null) return;
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const exportOffset =
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path[0] === "exports"
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? 1
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: path[0] === "module" && path[1] === "exports"
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? 2
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: null;
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if (exportOffset === null) return;
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if (path.length === exportOffset) {
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if (t.isObjectExpression(right)) collectObjectKeys(right, output);
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else addExport(output, "default");
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return;
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}
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if (path.startsWith("exports."))
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addExport(output, path.slice("exports.".length));
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if (path.startsWith("module.exports."))
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addExport(output, path.slice("module.exports.".length));
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addExport(output, path.slice(exportOffset).join("."));
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};
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const collectCallExports = (
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@@ -87,19 +95,28 @@ const collectCallExports = (
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output: Set<string>,
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): void => {
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const callee = memberPath(call.callee);
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if (callee === "Object.defineProperty") {
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const target = memberPath(call.arguments[0]);
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const name = stringValue(call.arguments[1]);
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if ((target === "exports" || target === "module.exports") && name)
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addExport(output, name);
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}
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if (!callee.endsWith(".d")) return;
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if (callee === null) return;
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const definePropertyCall =
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callee.length === 2 &&
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callee[0] === "Object" &&
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callee[1] === "defineProperty";
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const declarationCall = callee.length >= 2 && callee.at(-1) === "d";
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if (!definePropertyCall && !declarationCall) return;
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const target = memberPath(call.arguments[0]);
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const exportTarget =
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target !== null &&
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((target.length === 1 && target[0] === "exports") ||
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(target.length === 2 &&
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target[0] === "module" &&
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target[1] === "exports"));
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if (!exportTarget) return;
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if (definePropertyCall) {
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const name = stringValue(call.arguments[1]);
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if (name !== undefined) addExport(output, name);
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return;
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}
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const declarations = call.arguments[1];
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if (
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(target === "exports" || target === "module.exports") &&
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t.isObjectExpression(declarations)
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)
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if (t.isObjectExpression(declarations))
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collectObjectKeys(declarations, output);
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};
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@@ -109,8 +126,8 @@ const collectObjectKeys = (
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): void => {
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for (const property of object.properties) {
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if (!t.isObjectProperty(property) && !t.isObjectMethod(property)) continue;
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const name = propertyName(property.key);
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if (name !== "") addExport(output, name);
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const name = semanticStaticPropertyKey(property.key, property.computed);
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if (name !== null) addExport(output, name);
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}
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};
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@@ -118,7 +135,9 @@ const addExport = (output: Set<string>, name: string): void => {
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output.add(name);
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};
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const memberPath = (node: t.Node | null | undefined): string => {
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const memberPath = (
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node: t.Node | null | undefined,
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): readonly string[] | null => {
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const properties: string[] = [];
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let current = node;
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while (
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@@ -126,23 +145,19 @@ const memberPath = (node: t.Node | null | undefined): string => {
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current !== null &&
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(t.isMemberExpression(current) || t.isOptionalMemberExpression(current))
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) {
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properties.push(propertyName(current.property));
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current = t.isNode(current.object) ? current.object : undefined;
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const property = semanticStaticPropertyKey(
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current.property,
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current.computed,
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);
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if (property === null) return null;
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properties.push(property);
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current = current.object;
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}
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const root =
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current !== undefined && t.isIdentifier(current)
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? current.name
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: current !== undefined && t.isThisExpression(current)
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? "this"
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: "";
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if (properties.length === 0) return root;
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properties.reverse();
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const path = root === "" ? [] : [root];
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for (const property of properties) {
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if (path.length === 0 && property === "") continue;
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path.push(property);
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}
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return path.join(".");
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if (current === undefined || current === null) return null;
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const root = t.isIdentifier(current)
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? current.name
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: t.isThisExpression(current)
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? "this"
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: null;
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return root === null ? null : [root, ...properties.reverse()];
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};
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@@ -15,7 +15,7 @@ it("collects a 12,000-member CommonJS export path without recursion", () => {
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]);
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});
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it("preserves empty, dynamic, this, and private member path behavior", () => {
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it("preserves empty keys without inventing dynamic, this, or private exports", () => {
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const file = parseJavaScriptSource(`
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exports[""].value = 1;
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exports[""] = 0;
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@@ -24,11 +24,7 @@ it("preserves empty, dynamic, this, and private member path behavior", () => {
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class Example { #private = 0; read() { this.#private = 1; } }
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`);
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if (file === null) throw new Error("Expected valid JavaScript");
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expect(collectJavaScriptExports(file).values).toEqual([
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"",
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".value",
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"key.value",
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]);
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expect(collectJavaScriptExports(file).values).toEqual(["", ".value"]);
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});
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it("keeps left-first and outer-member-first bundler runtime matches", () => {
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Reference in New Issue
Block a user