fix: should support pkg.egg.typescript = true config (#255)

Author: fengmk2

lib/egg.js

@@ -31,10 +31,6 @@ class EggCore extends KoaApplication {
    */
   constructor(options = {}) {
     options.baseDir = options.baseDir || process.cwd();
-    // auto require('tsconfig-paths/register') on typescript app
-    if (process.env.EGG_TYPESCRIPT === 'true') {
-      require('tsconfig-paths').register({ cwd: options.baseDir });
-    }
     options.type = options.type || 'application';
 
     assert(typeof options.baseDir === 'string', 'options.baseDir required, and must be a string');

lib/loader/egg_loader.js

@@ -43,6 +43,12 @@ class EggLoader {
      */
     this.pkg = utility.readJSONSync(path.join(this.options.baseDir, 'package.json'));
 
+    // auto require('tsconfig-paths/register') on typescript app
+    // support env.EGG_TYPESCRIPT = true or { "egg": { "typescript": true } } on package.json
+    if (process.env.EGG_TYPESCRIPT === 'true' || (this.pkg.egg && this.pkg.egg.typescript)) {
+      require('tsconfig-paths').register({ cwd: this.options.baseDir });
+    }
+
     /**
      * All framework directories.
      *