chore: start preparing comparison tests for TS 6

Author: johnnyreilly

examples/fork-ts-checker-webpack-plugin/tsconfig.json

@@ -1,6 +1,6 @@
 {
     "compilerOptions": {
-        "target": "es5",
+        "target": "es6",
         "lib": ["es6", "dom"],
         "module": "esnext",
         "moduleResolution": "node",

examples/project-references-example/tsconfig-base.json

@@ -2,7 +2,7 @@
   "compilerOptions": {
     "declaration": true,
     "declarationMap": true,
-    "target": "es5",
+    "target": "es6",
     "module": "commonjs",
     "moduleResolution": "node",
     "esModuleInterop": true,

test/comparison-tests/allowJs-entryFileIsJs/tsconfig.json

@@ -1,6 +1,6 @@
 {
   "compilerOptions": {
-    "target": "es5",
+    "target": "es6",
     "module": "commonjs",
     "emitBOM": true,
     "outDir": "node",

test/comparison-tests/allowJs-ts-check/tsconfig.json

@@ -1,6 +1,6 @@
 {
   "compilerOptions": {
-    "target": "es5",
+    "target": "es6",
     "module": "commonjs",
     "emitBOM": true,
     "outDir": "node",