build: switch to commonjs for the transpile project; this allows use …

…of export =

build.ts

@@ -76,7 +76,7 @@ class WatchQueue {
     }
     private async buildFile(file: Path) {
         const bundle = await readVirtualBundle();
-        await timedTranspile(file, bundle);
+        await timedTranspile(readCompilerOptions(), file, bundle);
     }
 }
 
@@ -88,7 +88,7 @@ async function build() {
     const bundle = await readVirtualBundle();
     const entryPoints = await globEntryPoints();
     for (const entry of entryPoints) {
-        await timedTranspile(entry, bundle);
+        await timedTranspile(readCompilerOptions(), entry, bundle);
     }
 }
 
@@ -119,11 +119,16 @@ async function globEntryPoints() {
     return await glob("mod/**/*.ts", { cwd: "./src", withFileTypes: true });
 }
 
-async function timedTranspile(entryFile: Path, virtualBundle: [string, string][]) {
+function readCompilerOptions() {
+    const configJson = ts.readConfigFile("./src/tsconfig.json", ts.sys.readFile);
+    return ts.parseJsonConfigFileContent(configJson.config, ts.sys, ".").options;
+}
+
+async function timedTranspile(compilerOptions: ts.CompilerOptions, entryFile: Path, virtualBundle: [string, string][]) {
     const startMs = nowTime();
     let err = undefined;
     try {
-        await transpile(entryFile, virtualBundle);
+        await transpile(compilerOptions, entryFile, virtualBundle);
     } catch (e) {
         err = e;
     }
@@ -134,17 +139,16 @@ async function timedTranspile(entryFile: Path, virtualBundle: [string, string][]
     console.log(`${entryPath} ${result}`);
 }
 
-async function transpile(entryFile: Path, virtualBundle: [string, string][]) {
+async function transpile(compilerOptions: ts.CompilerOptions, entryFile: Path, virtualBundle: [string, string][]) {
     // Create a virtual project that includes the entry point file.
     const virtualProject = Object.fromEntries([await readVirtualFile(entryFile), ...virtualBundle]);
 
     // Call TypeScriptToLua.
     const bundleFile = (entryFile.parent ?? entryFile).resolve(path.basename(entryFile.name, ".ts") + ".lua");
     const result = tstl.transpileVirtualProject(virtualProject, {
-        target: ts.ScriptTarget.ESNext,
+        ...compilerOptions,
+        // Drop the jest types here.
         types: ["lua-types/5.0", "@typescript-to-lua/language-extensions"],
-        baseUrl: ".",
-        strict: true,
         luaTarget: tstl.LuaTarget.Lua50,
         sourceMapTraceback: false,
         luaBundle: bundleFile.relative(),

jest.config.ts

@@ -0,0 +1,8 @@
+import type { Config } from "jest";
+
+const config: Config = {
+    preset: "ts-jest",
+    testEnvironment: "node",
+    rootDir: "./src",
+};
+export default config;

package.json

@@ -3,6 +3,7 @@
   "scripts": {
     "lint": "prettier --check .",
     "fix:prettier": "prettier --write .",
+    "test": "jest",
     "watch": "ts-node-esm ./build.ts watch",
     "build": "ts-node-esm ./build.ts"
   },

src/tsconfig.json

@@ -0,0 +1,11 @@
+{
+    "compilerOptions": {
+        "baseUrl": ".",
+        "strict": true,
+        "types": ["lua-types/5.0", "@typescript-to-lua/language-extensions", "jest"],
+        "module": "CommonJS",
+        "moduleResolution": "Node10",
+        "target": "ESNext"
+    },
+    "include": ["@types", "lib", "mod", "test"]
+}

tsconfig.json

@@ -1,16 +1,10 @@
-// Note that this file is only used for editing in your IDE. It is not used by
-// the build script.
 {
     "compilerOptions": {
-        "target": "esnext",
-        "lib": ["esnext"],
-        "moduleResolution": "node",
-        "baseUrl": "./src/",
+        "target": "ESNext",
+        "lib": ["ESNext"],
         "strict": true,
-        "types": ["lua-types/5.0", "jest"],
-        // Needed for build.ts and ts-node.
-        "module": "ESNext",
-        "allowSyntheticDefaultImports": true
+        "module": "NodeNext",
+        "moduleResolution": "NodeNext"
     },
-    "include": ["src"]
+    "include": ["build.ts"]
 }