Adding JSON5 support (#57)

* Adding JSON5 support

Typescript allows comments and trailing commas in tsconfig and tslint allows comments.
The current library uses the default require for loading JSON, which fails with either.
Added the JSON5 library, and overwrote the .json extension to use it.

Author: joshball

build.js

@@ -1,3 +1,26 @@
+//
+// Sorry, this is a hack because this library uses an older version of itself
+// to build. So since I added comments to the config files, they will break
+// this build, so shimming it with this register.
+// 
+const fs = require('fs');
+const JSON5 = require('json5');
+// JSON5 has a register for the .json5 extension
+// however, it does not overide .json.
+// This will just override our require for *.json files and use
+// JSON5 to parse.
+require.extensions['.json'] = function (module, filename) {
+  const content = fs.readFileSync(filename, 'utf8');
+  try {
+      module.exports = JSON5.parse(content);
+  } catch (err) {
+      err.message = filename + ': ' + err.message;
+      throw err;
+  }
+};
+
+
+
 const transpiler = require('fuse-box-typechecker').TypeHelper;
 
 const transpileTo = function (outDir, moduleType) {

dist/commonjs/index.d.ts

@@ -1,4 +1,5 @@
 import { ITypeCheckerOptions, IResults } from './interfaces';
+import './register.json5';
 export declare class TypeHelperClass {
     private options;
     private worker;

dist/commonjs/index.js

@@ -0,0 +1 @@
+export {};

dist/commonjs/index.js.map

@@ -21,6 +21,7 @@
     "url": "https://github.com/fuse-box/fuse-box-typechecker"
   },
   "devDependencies": {
+    "@types/json5": "0.0.30",
     "fuse-box-typechecker": "2.11.0",
     "tslint": "^5.11.0",
     "typescript": "^3.2.2"
@@ -30,6 +31,7 @@
     "@types/watch": "^1.0.0",
     "chalk": "2.4.1",
     "gulp-changed": "^3.2.0",
+    "json5": "^2.1.0",
     "object.entries": "^1.0.4",
     "watch": "^1.0.2"
   }

dist/commonjs/register.json5.d.ts

@@ -7,7 +7,8 @@ import { Checker } from './checker';
 import * as watch from 'watch';
 import * as ts from 'typescript';
 import chalk from 'chalk';
-
+// Allows us to read valid (with comments) tsconfig and tslint files.
+import './register.json5';
 
 export class TypeHelperClass {
     private options: ITypeCheckerOptions;