From 5b6e9b0769fbaffd1e84fc948c2afbb4e9f731ad Mon Sep 17 00:00:00 2001
From: Tsukuha Kawakami <tsukuha0727@gmail.com>
Date: Thu, 13 Jun 2024 19:04:47 +0900
Subject: [PATCH] add feature about custom options to use own tsconfig

---
 packages/tsc/index.ts   |  5 ++++-
 packages/tsc/options.ts | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+), 1 deletion(-)
 create mode 100644 packages/tsc/options.ts

diff --git a/packages/tsc/index.ts b/packages/tsc/index.ts
index 120a15534d..1da4481a25 100644
--- a/packages/tsc/index.ts
+++ b/packages/tsc/index.ts
@@ -1,5 +1,6 @@
 import { runTsc } from '@volar/typescript/lib/quickstart/runTsc';
 import * as vue from '@vue/language-core';
+import { createCliOptions } from './options'
 
 const windowsPathReg = /\\/g;
 
@@ -7,6 +8,8 @@ export function run() {
 
 	let runExtensions = ['.vue'];
 
+	const customOptions = createCliOptions();
+
 	const extensionsChangedException = new Error('extensions changed');
 	const main = () => runTsc(
 		require.resolve('typescript/lib/tsc'),
@@ -14,7 +17,7 @@ export function run() {
 		(ts, options) => {
 			const { configFilePath } = options.options;
 			const vueOptions = typeof configFilePath === 'string'
-				? vue.createParsedCommandLine(ts, ts.sys, configFilePath.replace(windowsPathReg, '/')).vueOptions
+				? vue.createParsedCommandLine(ts, ts.sys, (customOptions?.project || configFilePath).replace(windowsPathReg, '/')).vueOptions
 				: vue.resolveVueCompilerOptions({});
 			const allExtensions = [
 				...vueOptions.extensions,
diff --git a/packages/tsc/options.ts b/packages/tsc/options.ts
new file mode 100644
index 0000000000..3b33b5dfed
--- /dev/null
+++ b/packages/tsc/options.ts
@@ -0,0 +1,36 @@
+interface Options {
+	Project: 'project',
+};
+interface CustomOptions extends Record<Options[keyof Options], string> {};
+
+const ARGS_ACCESS_NUM = 2;
+const OPTIONS = {
+	Project: 'project',
+} as const satisfies Options;
+const OPTIONS_PREFIX = '--';
+
+export function createCliOptions() {
+	const args = structuredClone(process.argv);
+	let parsedOptions: CustomOptions | undefined
+	args.slice(ARGS_ACCESS_NUM).forEach((arg, i) => {
+		const options = Object.values(OPTIONS)
+		const optionStrings = options.map(t => `${OPTIONS_PREFIX}${t}`);
+		if (!optionStrings.includes(arg)) {
+			return;
+		}
+		if (args[i + 1] == null) {
+			return;
+		}
+		const findIndex = optionStrings.findIndex(s => s === arg);
+		if (findIndex !== -1 && !!options[findIndex]) {
+			parsedOptions = {
+				...parsedOptions,
+				[options[findIndex]]: arg[i + 1],
+			};
+			// required to remove custom options and value for executing runTsc()
+			process.argv = process.argv.filter((_, j) => j !== i + ARGS_ACCESS_NUM && j !== i + ARGS_ACCESS_NUM + 1);
+		}
+		args.slice(1);
+	});
+	return parsedOptions;
+};