Doesn't handle tsconfig.json with comments

Start by locating the source corresponding to lib/index.js and trace the two tsconfig.json reads shown in the issue. Review TypeScript's readConfigFile behavior and the supplied workaround, then verify that project-reference configs containing comments no longer produce a JSON parse error. Done means both alias-generation paths handle commented configs while preserving error handling.

The JSON parsing of tsconfig.json files doesn't seem to having comments in them, and errors with a JSON parse error.

Here's the patch I'm using to work around it (with patch-package):

diff --git a/node_modules/@microsoft/webpack-project-references-alias/lib/index.js b/node_modules/@microsoft/webpack-project-references-alias/lib/index.js
index f88fe3a..1d33585 100644
--- a/node_modules/@microsoft/webpack-project-references-alias/lib/index.js
+++ b/node_modules/@microsoft/webpack-project-references-alias/lib/index.js
@@ -3,6 +3,8 @@ Object.defineProperty(exports, "__esModule", { value: true });
 const fs = require("fs");
 const path = require("path");
 const functional_1 = require("./functional");
+const typescript = require("typescript");
+
 function getAliasForProject(project) {
     if (typeof project === "undefined") {
         project = process.cwd();
@@ -33,7 +35,7 @@ const getReferencedProjectsRecursive = functional_1.memoize((tsConfigPath) => {
 function getReferencedProjects(tsConfigPath) {
     var _a;
     const projectDir = path.dirname(tsConfigPath);
-    const config = require(tsConfigPath);
+    const config = readConfigFile(tsConfigPath)
     const references = (_a = config.references) === null || _a === void 0 ? void 0 : _a.map(o => o.path).map(p => path.join(projectDir, p)).map(resolveTsConfig);
     return (references !== null && references !== void 0 ? references : []);
 }
@@ -62,7 +64,7 @@ function tryGetPackageInfo(dir) {
 }
 function getAliasFor(tsConfigPath) {
     const projectRootDir = path.dirname(tsConfigPath);
-    const config = require(tsConfigPath);
+    const config = readConfigFile(tsConfigPath);
     const hasExplicitOutDir = typeof config.compilerOptions.outDir !== "undefined";
     const rootDir = path.join(projectRootDir, config.compilerOptions.rootDir || "");
     const outDir = hasExplicitOutDir
@@ -82,3 +84,6 @@ function getAliasFor(tsConfigPath) {
     alias[outDir] = rootDir;
     return alias;
 }
+function readConfigFile(tsConfigPath) {
+  return typescript.readConfigFile(tsConfigPath, path => fs.readFileSync(path, 'utf-8')).config
+}

It totally ignores errors which is naive, but good enough as a temporary workaround.