feat: add readJson/readJsonSync for fs modules (denoland/deno_std#269)

Original: https://github.com/denoland/deno_std/commit/e4485d722ac978c023f9f6720734264e99e1577f

1 files changed, 42 insertions, 0 deletions

diff --git a/fs/read_json.ts b/fs/read_json.ts
new file mode 100644
index 000000000..d5c639ae2
--- /dev/null
+++ b/fs/read_json.ts
@@ -0,0 +1,42 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+import * as path from "./path/mod.ts";
+
+/**
+ * Reads a JSON file and then parses it into an object
+ * @export
+ * @param {string} filePath
+ * @returns {Promise<any>}
+ */
+export async function readJson(filePath: string): Promise<any> {
+  filePath = path.resolve(filePath);
+  const decoder = new TextDecoder("utf-8");
+
+  const content = decoder.decode(await Deno.readFile(filePath));
+
+  try {
+    return JSON.parse(content);
+  } catch (err) {
+    err.message = `${filePath}: ${err.message}`;
+    throw err;
+  }
+}
+
+/**
+ * Reads a JSON file and then parses it into an object
+ * @export
+ * @param {string} filePath
+ * @returns {void}
+ */
+export function readJsonSync(filePath: string): any {
+  filePath = path.resolve(filePath);
+  const decoder = new TextDecoder("utf-8");
+
+  const content = decoder.decode(Deno.readFileSync(filePath));
+
+  try {
+    return JSON.parse(content);
+  } catch (err) {
+    err.message = `${filePath}: ${err.message}`;
+    throw err;
+  }
+}