feat: create output directory if it does not exist

Closes #15

Author: kbrandwijk

package.json

@@ -26,6 +26,7 @@
   },
   "homepage": "https://github.com/supergraphql/graphql-cli-prepare#readme",
   "devDependencies": {
+    "@types/fs-extra": "5.0.0",
     "@types/inquirer": "0.0.36",
     "@types/node": "8.5.2",
     "@types/yargs": "10.0.0",
@@ -40,6 +41,7 @@
   },
   "dependencies": {
     "chalk": "2.3.0",
+    "fs-extra": "5.0.0",
     "graphql-import": "0.1.9",
     "graphql-static-binding": "0.2.1",
     "lodash": "4.17.4"

src/prepare.ts

@@ -1,5 +1,5 @@
 import chalk from 'chalk'
-import * as fs from 'fs'
+import * as fs from 'fs-extra'
 import { Context } from 'graphql-cli'
 import { GraphQLProjectConfig } from 'graphql-config'
 import { importSchema } from 'graphql-import'
@@ -223,9 +223,7 @@ export class Prepare {
       )
     }
 
-    if (!fs.existsSync(path.dirname(outputPath))) {
-      throw new Error(`Output path '${path.dirname(outputPath)}' does not exist.`)
-    }
+    fs.ensureDirSync(path.dirname(outputPath))
     return outputPath
   }
 }

yarn.lock

@@ -73,6 +73,12 @@
   version "0.6.0"
   resolved "https://registry.yarnpkg.com/@sindresorhus/is/-/is-0.6.0.tgz#383f456b26bc96c7889f0332079f4358b16c58dc"
 
+"@types/fs-extra@^5.0.0":
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/@types/fs-extra/-/fs-extra-5.0.0.tgz#d3e225b35eb5c6d3a5a782c28219df365c781413"
+  dependencies:
+    "@types/node" "*"
+
 "@types/graphql@0.11.7":
   version "0.11.7"
   resolved "https://registry.yarnpkg.com/@types/graphql/-/graphql-0.11.7.tgz#da39a2f7c74e793e32e2bb7b3b68da1691532dd5"