Bar graph added.

node_modules/vega-loader/src/read.js

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+import {inferTypes, typeParsers} from './type';
+import {formats} from './formats/index';
+import {timeFormatDefaultLocale} from 'vega-format';
+import {error, hasOwnProperty} from 'vega-util';
+
+export default function(data, schema, timeParser, utcParser) {
+  schema = schema || {};
+
+  const reader = formats(schema.type || 'json');
+  if (!reader) error('Unknown data format type: ' + schema.type);
+
+  data = reader(data, schema);
+  if (schema.parse) parse(data, schema.parse, timeParser, utcParser);
+
+  if (hasOwnProperty(data, 'columns')) delete data.columns;
+  return data;
+}
+
+function parse(data, types, timeParser, utcParser) {
+  if (!data.length) return; // early exit for empty data
+
+  const locale = timeFormatDefaultLocale();
+  timeParser = timeParser || locale.timeParse;
+  utcParser = utcParser || locale.utcParse;
+
+  var fields = data.columns || Object.keys(data[0]),
+      parsers, datum, field, i, j, n, m;
+
+  if (types === 'auto') types = inferTypes(data, fields);
+
+  fields = Object.keys(types);
+  parsers = fields.map(function(field) {
+    var type = types[field],
+        parts, pattern;
+
+    if (type && (type.startsWith('date:') || type.startsWith('utc:'))) {
+      parts = type.split(/:(.+)?/, 2);  // split on first :
+      pattern = parts[1];
+
+      if ((pattern[0] === '\'' && pattern[pattern.length-1] === '\'') ||
+          (pattern[0] === '"'  && pattern[pattern.length-1] === '"')) {
+        pattern = pattern.slice(1, -1);
+      }
+
+      const parse = parts[0] === 'utc' ? utcParser : timeParser;
+      return parse(pattern);
+    }
+
+    if (!typeParsers[type]) {
+      throw Error('Illegal format pattern: ' + field + ':' + type);
+    }
+
+    return typeParsers[type];
+  });
+
+  for (i=0, n=data.length, m=fields.length; i<n; ++i) {
+    datum = data[i];
+    for (j=0; j<m; ++j) {
+      field = fields[j];
+      datum[field] = parsers[j](datum[field]);
+    }
+  }
+}