Roughing out the demo app

node_modules/json-server/lib/cli/utils/is.js

@@ -0,0 +1,19 @@
+"use strict";
+
+module.exports = {
+  FILE,
+  JS,
+  URL
+};
+
+function FILE(s) {
+  return !URL(s) && /\.json$/.test(s);
+}
+
+function JS(s) {
+  return !URL(s) && /\.js$/.test(s);
+}
+
+function URL(s) {
+  return /^(http|https):/.test(s);
+}

node_modules/json-server/lib/cli/utils/load.js

@@ -0,0 +1,74 @@
+"use strict";
+
+const fs = require('fs');
+
+const path = require('path');
+
+const request = require('request');
+
+const low = require('lowdb');
+
+const FileAsync = require('lowdb/adapters/FileAsync');
+
+const Memory = require('lowdb/adapters/Memory');
+
+const is = require('./is');
+
+const chalk = require('chalk');
+
+const example = {
+  posts: [{
+    id: 1,
+    title: 'json-server',
+    author: 'typicode'
+  }],
+  comments: [{
+    id: 1,
+    body: 'some comment',
+    postId: 1
+  }],
+  profile: {
+    name: 'typicode'
+  }
+};
+
+module.exports = function (source) {
+  return new Promise((resolve, reject) => {
+    if (is.FILE(source)) {
+      if (!fs.existsSync(source)) {
+        console.log(chalk.yellow(`  Oops, ${source} doesn't seem to exist`));
+        console.log(chalk.yellow(`  Creating ${source} with some default data`));
+        console.log();
+        fs.writeFileSync(source, JSON.stringify(example, null, 2));
+      }
+
+      resolve(low(new FileAsync(source)));
+    } else if (is.URL(source)) {
+      // Load remote data
+      const opts = {
+        url: source,
+        json: true
+      };
+      request(opts, (err, response) => {
+        if (err) return reject(err);
+        resolve(low(new Memory()).setState(response.body));
+      });
+    } else if (is.JS(source)) {
+      // Clear cache
+      const filename = path.resolve(source);
+      delete require.cache[filename];
+
+      const dataFn = require(filename);
+
+      if (typeof dataFn !== 'function') {
+        throw new Error('The database is a JavaScript file but the export is not a function.');
+      } // Run dataFn to generate data
+
+
+      const data = dataFn();
+      resolve(low(new Memory()).setState(data));
+    } else {
+      throw new Error(`Unsupported source ${source}`);
+    }
+  });
+};