Used JSON5 for config file parsing (#755)

* Used JSON5 for config file parsing

* Corrected test

* Oops, a console log

Co-authored-by: Manuel Bojato <30560560+KingDarBoja@users.noreply.github.com>

Author: Josh Goldberg

package-lock.json

@@ -15,9 +15,9 @@
         "cson-parser": "4.0.5",
         "eslint-config-prettier": "6.14.0",
         "glob": "7.1.6",
+        "json5": "^2.1.3",
         "lodash": "4.17.20",
         "minimatch": "3.0.4",
-        "strip-json-comments": "3.1.1",
         "tslint": "6.1.3",
         "typescript": "4.0.3"
     },
@@ -30,6 +30,7 @@
         "@types/eslint-config-prettier": "6.11.0",
         "@types/glob": "7.1.3",
         "@types/jest": "26.0.15",
+        "@types/json5": "0.0.30",
         "@types/lodash": "4.14.162",
         "@types/minimatch": "3.0.3",
         "@types/node": "12.12.21",

package.json

@@ -122,7 +122,7 @@ describe("importer", () => {
         // Assert
         expect(imported).toEqual(
             expect.objectContaining({
-                message: "Unexpected token N in JSON at position 0",
+                message: "JSON5: invalid character 'O' at 1:2",
             }),
         );
     });

src/input/importer.test.ts

@@ -1,4 +1,4 @@
-import stripJsonComments from "strip-json-comments";
+import JSON5 from "json5";
 
 export const isDefined = <Item>(item: Item | undefined): item is Item => item !== undefined;
 
@@ -55,4 +55,4 @@ export const uniqueFromSources = <T>(...sources: (T | T[] | undefined)[]) => {
     return Array.from(new Set(items));
 };
 
-export const parseJson = (text: string) => JSON.parse(stripJsonComments(text));
+export const parseJson = (text: string) => JSON5.parse(text);