Add possibility to indicate explicitly tsconfig location

example/project/lib1/index.ts

@@ -0,0 +1,3 @@
+export function hello1(): void {
+  console.log("Hello1");
+}

example/project/main.ts

@@ -0,0 +1,3 @@
+import { hello1 } from "lib1";
+
+hello1();

example/project/tsconfig.json

@@ -0,0 +1,10 @@
+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "target": "es5",
+    "outDir": "js_out",
+    "noImplicitAny": false,
+    "sourceMap": false,
+    "baseUrl": "."
+  }
+}

package.json

@@ -10,6 +10,7 @@
   "devDependencies": {
     "@types/chai": "^4.0.10",
     "@types/deepmerge": "^1.3.2",
+    "@types/minimist": "^1.2.0",
     "@types/mocha": "^2.2.45",
     "@types/node": "^6.0.54",
     "@types/strip-bom": "^3.0.0",
@@ -29,12 +30,14 @@
   },
   "dependencies": {
     "deepmerge": "^2.0.1",
+    "minimist": "^1.2.0",
     "strip-bom": "^3.0.0",
     "strip-json-comments": "^2.0.1"
   },
   "scripts": {
     "start": "cd src && ts-node index.ts",
-    "example:node": "yarn build && cd example/node && ts-node -r ../register.js main.ts",
+    "example:node": "yarn build && cd ./example/node && ts-node -r ../register.js main.ts",
+    "example:project": "yarn build && ts-node -r ./register.js -P ./example/project/tsconfig.json ./example/project/main.ts",
     "example:api": "cd example/api && ts-node main.ts",
     "example:perf": "cd example/perf && ts-node main.ts",
     "test": "mocha",

src/config-loader.ts

@@ -1,5 +1,6 @@
 import * as TsConfigLoader from "./tsconfig-loader";
 import * as path from "path";
+import { options } from "./options";
 
 export interface ExplicitParams {
   baseUrl: string;
@@ -33,7 +34,7 @@ export type ConfigLoaderResult =
   | ConfigLoaderSuccessResult
   | ConfigLoaderFailResult;
 
-export function loadConfig(cwd: string = process.cwd()): ConfigLoaderResult {
+export function loadConfig(cwd: string = options.cwd): ConfigLoaderResult {
   return configLoader({ cwd: cwd });
 }
 

src/options.ts

@@ -0,0 +1,16 @@
+import * as minimist from "minimist";
+
+const argv = minimist(process.argv.slice(2), {
+  string: ["project"],
+  alias: {
+    project: ["P"]
+  }
+});
+
+export interface Options {
+  cwd: string;
+}
+
+export const options: Options = {
+  cwd: argv.project || process.cwd()
+};

src/register.ts

@@ -1,12 +1,13 @@
 import { createMatchPath } from "./match-path-sync";
 import { configLoader, ExplicitParams } from "./config-loader";
+import { options } from "./options";
 
 /**
  * Installs a custom module load function that can adhere to paths in tsconfig.
  */
 export function register(explicitParams: ExplicitParams): void {
   const configLoaderResult = configLoader({
-    cwd: process.cwd(),
+    cwd: options.cwd,
     explicitParams
   });
 

yarn.lock

@@ -10,6 +10,10 @@
   version "1.3.2"
   resolved "https://registry.yarnpkg.com/@types/deepmerge/-/deepmerge-1.3.2.tgz#a87837384624d63e8c3df3ae85693d574ea6b5db"
 
+"@types/minimist@^1.2.0":
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/@types/minimist/-/minimist-1.2.0.tgz#69a23a3ad29caf0097f06eda59b361ee2f0639f6"
+
 "@types/mocha@^2.2.45":
   version "2.2.45"
   resolved "https://registry.yarnpkg.com/@types/mocha/-/mocha-2.2.45.tgz#816572b6e45164526a36d4faa123e8267d6d5d0a"