Update schema for TS 2.9 flags (#451)

* Add `es2017.intl` and `es2018.intl` to the list of lib files. Also split on multiple lines

* Add documentation for `--keyofStringOnly`, `--declarationMap` and `--resolveJsonModule`

Author: mhegazy

src/schemas/json/jsconfig.json

@@ -329,6 +329,14 @@
                 "description": "Emit '__importStar' and '__importDefault' helpers for runtime babel ecosystem compatibility and enable '--allowSyntheticDefaultImports' for typesystem compatibility. Requires TypeScript version 2.7 or later.",
                 "type": "boolean"
             },
+            "keyofStringsOnly": {
+                "description": "Resolve 'keyof' to string valued property names only (no numbers or symbols). Requires TypeScript version 2.9 or later.",
+                "type": "boolean"
+            },
+            "resolveJsonModule": {
+                "description": "Include modules imported with '.json' extension. Requires TypeScript version 2.9 or later.",
+                "type": "boolean"
+            },
             "plugins": {
               "description": "List of TypeScript language server plugins to load. Requires TypeScript version 2.3 or later.",
               "type": "array",

src/schemas/json/tsconfig.json

@@ -383,8 +383,12 @@
               "type": "array",
               "items": {
                 "type": "string",
-                "enum": [ "es5", "es6", "es2015", "es7", "es2016", "es2017", "es2018", "esnext", "dom", "dom.iterable", "webworker", "scripthost", "es2015.core", "es2015.collection", "es2015.generator", "es2015.iterable",
-                        "es2015.promise", "es2015.proxy", "es2015.reflect", "es2015.symbol", "es2015.symbol.wellknown", "es2016.array.include", "es2017.object", "es2017.sharedmemory", "es2017.string", "es2017.typedarrays", "es2018.promise", "es2018.regexp", "esnext.array", "esnext.asynciterable"]
+                "enum": [ "es5", "es6", "es2015", "es7", "es2016", "es2017", "es2018", "esnext", "dom", "dom.iterable", "webworker", "scripthost",
+                          "es2015.core", "es2015.collection", "es2015.generator", "es2015.iterable", "es2015.promise", "es2015.proxy", "es2015.reflect", "es2015.symbol", "es2015.symbol.wellknown",
+                          "es2016.array.include",
+                          "es2017.object", "es2017.sharedmemory", "es2017.string", "es2017.typedarrays", "es2017.intl",
+                          "es2018.promise", "es2018.regexp", "es2018.intl",
+                          "esnext.array", "esnext.asynciterable"]
               }
             },
             "strictNullChecks": {
@@ -432,6 +436,18 @@
             "esModuleInterop": {
               "description": "Emit '__importStar' and '__importDefault' helpers for runtime babel ecosystem compatibility and enable '--allowSyntheticDefaultImports' for typesystem compatibility. Requires TypeScript version 2.7 or later.",
               "type": "boolean"
+            },
+            "keyofStringsOnly": {
+                "description": "Resolve 'keyof' to string valued property names only (no numbers or symbols). Requires TypeScript version 2.9 or later.",
+                "type": "boolean"
+            },
+            "declarationMap": {
+                "description": "Generates a sourcemap for each corresponding '.d.ts' file. Requires TypeScript version 2.9 or later.",
+                "type": "boolean"
+            },
+            "resolveJsonModule": {
+                "description": "Include modules imported with '.json' extension. Requires TypeScript version 2.9 or later.",
+                "type": "boolean"
             }
           }
         }