add an initial implementation

index.js

@@ -0,0 +1,28 @@
+const jishon = require('jishon')
+
+const flatten = (result, next) =>
+  result.concat(next)
+
+flatten.args = [flatten, []]
+
+const pluck = key => item =>
+  item[key]
+
+const pluckAudio = pluck('audio')
+
+module.exports = async ({term, reading}) => {
+  const words = (await jishon(term)).words
+
+  if (reading) {
+    const word = words
+      .find(word => word.furigana === reading)
+
+    if (!word) return []
+
+    return Object.values(pluckAudio(word))
+  }
+
+  return words.map(pluckAudio)
+    .map(Object.values)
+    .reduce(...flatten.args)
+}