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node_modules/table/dist/makeStreamConfig.js.flow

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+import _ from 'lodash';
+import getBorderCharacters from './getBorderCharacters';
+import validateConfig from './validateConfig';
+
+/**
+ * Merges user provided border characters with the default border ("honeywell") characters.
+ *
+ * @param {Object} border
+ * @returns {Object}
+ */
+const makeBorder = (border = {}) => {
+  return Object.assign({}, getBorderCharacters('honeywell'), border);
+};
+
+/**
+ * Creates a configuration for every column using default
+ * values for the missing configuration properties.
+ *
+ * @param {number} columnCount
+ * @param {Object} columns
+ * @param {Object} columnDefault
+ * @returns {Object}
+ */
+const makeColumns = (columnCount, columns = {}, columnDefault = {}) => {
+  _.times(columnCount, (index) => {
+    if (_.isUndefined(columns[index])) {
+      columns[index] = {};
+    }
+
+    columns[index] = Object.assign({
+      alignment: 'left',
+      paddingLeft: 1,
+      paddingRight: 1,
+      truncate: Infinity,
+      wrapWord: false
+    }, columnDefault, columns[index]);
+  });
+
+  return columns;
+};
+
+/**
+ * @typedef {Object} columnConfig
+ * @property {string} alignment
+ * @property {number} width
+ * @property {number} truncate
+ * @property {number} paddingLeft
+ * @property {number} paddingRight
+ */
+
+/**
+ * @typedef {Object} streamConfig
+ * @property {columnConfig} columnDefault
+ * @property {Object} border
+ * @property {columnConfig[]}
+ * @property {number} columnCount Number of columns in the table (required).
+ */
+
+/**
+ * Makes a new configuration object out of the userConfig object
+ * using default values for the missing configuration properties.
+ *
+ * @param {streamConfig} userConfig
+ * @returns {Object}
+ */
+export default (userConfig = {}) => {
+  validateConfig('streamConfig.json', userConfig);
+
+  const config = _.cloneDeep(userConfig);
+
+  if (!config.columnDefault || !config.columnDefault.width) {
+    throw new Error('Must provide config.columnDefault.width when creating a stream.');
+  }
+
+  if (!config.columnCount) {
+    throw new Error('Must provide config.columnCount.');
+  }
+
+  config.border = makeBorder(config.border);
+  config.columns = makeColumns(config.columnCount, config.columns, config.columnDefault);
+
+  return config;
+};