Use arrow-parens only as-needed

.eslintrc

@@ -13,6 +13,7 @@
     "node": true
   },
   "rules": {
+    "arrow-parens": ["error", "as-needed"],
     "class-methods-use-this": ["off"],
     "comma-dangle": ["error", {"arrays": "always-multiline", "objects": "always-multiline", "imports": "always-multiline", "exports": "always-multiline", "functions": "never"}],
     "default-case": ["off"],

.prettier

@@ -2,5 +2,6 @@
   "bracketSpacing": false,
   "printWidth": 160,
   "trailingComma": "all",
-  "bracketSpacing": false
+  "bracketSpacing": true,
+  "arrowParens": "avoid"
 }

benchmark.js

@@ -13,10 +13,10 @@ const runs = 3;
 
         let worksheetCount = 0;
         let rowCount = 0;
-        workbookReader.on('worksheet', (worksheet) => {
+        workbookReader.on('worksheet', worksheet => {
           worksheetCount += 1;
           console.log(`Reading worksheet ${worksheetCount}`);
-          worksheet.on('row', (row) => {
+          worksheet.on('row', row => {
             rowCount += 1;
             if (rowCount % 50000 === 0) console.log(`Reading row ${rowCount}`);
           });

lib/csv/csv.js

@@ -79,7 +79,7 @@ class CSV {
 
       const csvStream = fastCsv
         .parse(options.parserOptions)
-        .on('data', (data) => {
+        .on('data', data => {
           worksheet.addRow(data.map(map));
         })
         .on('end', () => {
@@ -120,7 +120,7 @@ class CSV {
       const {dateFormat, dateUTC} = options;
       const map =
         options.map ||
-        ((value) => {
+        (value => {
           if (value) {
             if (value.text || value.hyperlink) {
               return value.hyperlink || value.text || '';

lib/csv/line-buffer.js

@@ -63,7 +63,7 @@ class LineBuffer extends EventEmitter {
 
   _flush() {
     if (!this.corked) {
-      this.queue.forEach((line) => {
+      this.queue.forEach(line => {
         this.emit('line', line);
       });
       this.queue = [];

lib/csv/stream-converter.js

@@ -105,7 +105,7 @@ class StreamConverter {
   on(type, callback) {
     switch (type) {
       case 'data':
-        this.inner.on('data', (chunk) => {
+        this.inner.on('data', chunk => {
           callback(this.convertOutwards(chunk));
         });
         return this;

lib/doc/cell.js

@@ -292,7 +292,7 @@ class Cell {
   set names(value) {
     const {definedNames} = this.workbook;
     definedNames.removeAllNames(this.fullAddress);
-    value.forEach((name) => {
+    value.forEach(name => {
       definedNames.addEx(this.fullAddress, name);
     });
   }
@@ -509,7 +509,7 @@ class RichTextValue {
   }
 
   toString() {
-    return this.model.value.richText.map((t) => t.text).join('');
+    return this.model.value.richText.map(t => t.text).join('');
   }
 
   get type() {
@@ -748,7 +748,7 @@ class FormulaValue {
 
   _copyModel(model) {
     const copy = {};
-    const cp = (name) => {
+    const cp = name => {
       const value = model[name];
       if (value) {
         copy[name] = value;

lib/doc/column.js

@@ -198,7 +198,7 @@ class Column {
   // styles
   _applyStyle(name, value) {
     this.style[name] = value;
-    this.eachCell((cell) => {
+    this.eachCell(cell => {
       cell[name] = value;
     });
     return value;

lib/doc/defined-names.js

@@ -54,14 +54,14 @@ class DefinedNames {
   }
 
   removeAllNames(location) {
-    _.each(this.matrixMap, (matrix) => {
+    _.each(this.matrixMap, matrix => {
       matrix.removeCellEx(location);
     });
   }
 
   forEach(callback) {
     _.each(this.matrixMap, (matrix, name) => {
-      matrix.forEach((cell) => {
+      matrix.forEach(cell => {
         callback(name, cell);
       });
     });
@@ -128,13 +128,13 @@ class DefinedNames {
     }
 
     // mark and sweep!
-    matrix.forEach((cell) => {
+    matrix.forEach(cell => {
       cell.mark = true;
     });
     const ranges = matrix
-      .map((cell) => cell.mark && this._explore(matrix, cell))
+      .map(cell => cell.mark && this._explore(matrix, cell))
       .filter(Boolean)
-      .map((range) => range.$shortRange);
+      .map(range => range.$shortRange);
 
     return {
       name,
@@ -157,30 +157,30 @@ class DefinedNames {
   }
 
   spliceRows(sheetName, start, numDelete, numInsert) {
-    _.each(this.matrixMap, (matrix) => {
+    _.each(this.matrixMap, matrix => {
       matrix.spliceRows(sheetName, start, numDelete, numInsert);
       this.normaliseMatrix(matrix, sheetName);
     });
   }
 
   spliceColumns(sheetName, start, numDelete, numInsert) {
-    _.each(this.matrixMap, (matrix) => {
+    _.each(this.matrixMap, matrix => {
       matrix.spliceColumns(sheetName, start, numDelete, numInsert);
       this.normaliseMatrix(matrix, sheetName);
     });
   }
 
   get model() {
     // To get names per cell - just iterate over all names finding cells if they exist
-    return _.map(this.matrixMap, (matrix, name) => this.getRanges(name, matrix)).filter((definedName) => definedName.ranges.length);
+    return _.map(this.matrixMap, (matrix, name) => this.getRanges(name, matrix)).filter(definedName => definedName.ranges.length);
   }
 
   set model(value) {
     // value is [ { name, ranges }, ... ]
     const matrixMap = (this.matrixMap = {});
-    value.forEach((definedName) => {
+    value.forEach(definedName => {
       const matrix = (matrixMap[definedName.name] = new CellMatrix());
-      definedName.ranges.forEach((rangeStr) => {
+      definedName.ranges.forEach(rangeStr => {
         if (rangeRegexp.test(rangeStr.split('!').pop() || '')) {
           matrix.addCell(rangeStr);
         }

lib/doc/row.js

@@ -165,7 +165,7 @@ class Row {
   // return a sparse array of cell values
   get values() {
     const values = [];
-    this._cells.forEach((cell) => {
+    this._cells.forEach(cell => {
       if (cell && cell.type !== Enums.ValueType.Null) {
         values[cell.col] = cell.value;
       }
@@ -210,7 +210,7 @@ class Row {
 
   // returns true if the row includes at least one cell with a value
   get hasValues() {
-    return _.some(this._cells, (cell) => cell && cell.type !== Enums.ValueType.Null);
+    return _.some(this._cells, cell => cell && cell.type !== Enums.ValueType.Null);
   }
 
   get cellCount() {
@@ -229,7 +229,7 @@ class Row {
   get dimensions() {
     let min = 0;
     let max = 0;
-    this._cells.forEach((cell) => {
+    this._cells.forEach(cell => {
       if (cell && cell.type !== Enums.ValueType.Null) {
         if (!min || min > cell.col) {
           min = cell.col;
@@ -251,7 +251,7 @@ class Row {
   // styles
   _applyStyle(name, value) {
     this.style[name] = value;
-    this._cells.forEach((cell) => {
+    this._cells.forEach(cell => {
       if (cell) {
         cell[name] = value;
       }
@@ -332,7 +332,7 @@ class Row {
     const cells = [];
     let min = 0;
     let max = 0;
-    this._cells.forEach((cell) => {
+    this._cells.forEach(cell => {
       if (cell) {
         const cellModel = cell.model;
         if (cellModel) {
@@ -368,7 +368,7 @@ class Row {
     }
     this._cells = [];
     let previousAddress;
-    value.cells.forEach((cellModel) => {
+    value.cells.forEach(cellModel => {
       switch (cellModel.type) {
         case Cell.Types.Merge:
           // special case - don't add this types

lib/doc/table.js

@@ -182,7 +182,7 @@ class Table {
     // the sheet...
     const assignStyle = (cell, style) => {
       if (style) {
-        Object.keys(style).forEach((key) => {
+        Object.keys(style).forEach(key => {
           cell[key] = style[key];
         });
       }
@@ -200,7 +200,7 @@ class Table {
         assignStyle(cell, style);
       });
     }
-    table.rows.forEach((data) => {
+    table.rows.forEach(data => {
       const r = worksheet.getRow(row + count++);
       data.forEach((value, j) => {
         const cell = r.getCell(col + j);
@@ -245,7 +245,7 @@ class Table {
         cell.value = column.name;
       });
     }
-    table.rows.forEach((data) => {
+    table.rows.forEach(data => {
       const r = worksheet.getRow(row + count++);
       data.forEach((value, j) => {
         const cell = r.getCell(col + j);
@@ -379,7 +379,7 @@ class Table {
     this.cacheState();
 
     this.table.columns.splice(colIndex, count);
-    this.table.rows.forEach((row) => {
+    this.table.rows.forEach(row => {
       row.splice(colIndex, count);
     });
   }

lib/doc/workbook.js

@@ -51,7 +51,7 @@ class Workbook {
       console.warn(`Worksheet name ${name} exceeds 31 chars. This will be truncated`);
     }
     name = (name || `sheet${id}`).substring(0, 31);
-    if (this._worksheets.find((ws) => ws && ws.name.toLowerCase() === name.toLowerCase())) {
+    if (this._worksheets.find(ws => ws && ws.name.toLowerCase() === name.toLowerCase())) {
       throw new Error(`Worksheet name already exists: ${name}`);
     }
 
@@ -109,7 +109,7 @@ class Workbook {
       return this._worksheets[id];
     }
     if (typeof id === 'string') {
-      return this._worksheets.find((worksheet) => worksheet && worksheet.name === id);
+      return this._worksheets.find(worksheet => worksheet && worksheet.name === id);
     }
     return undefined;
   }
@@ -123,7 +123,7 @@ class Workbook {
   }
 
   eachSheet(iteratee) {
-    this.worksheets.forEach((sheet) => {
+    this.worksheets.forEach(sheet => {
       iteratee(sheet, sheet.id);
     });
   }
@@ -156,8 +156,8 @@ class Workbook {
       created: this.created,
       modified: this.modified,
       properties: this.properties,
-      worksheets: this.worksheets.map((worksheet) => worksheet.model),
-      sheets: this.worksheets.map((ws) => ws.model).filter(Boolean),
+      worksheets: this.worksheets.map(worksheet => worksheet.model),
+      sheets: this.worksheets.map(ws => ws.model).filter(Boolean),
       definedNames: this._definedNames.model,
       views: this.views,
       company: this.company,
@@ -196,9 +196,9 @@ class Workbook {
     this.properties = value.properties;
     this.calcProperties = value.calcProperties;
     this._worksheets = [];
-    value.worksheets.forEach((worksheetModel) => {
+    value.worksheets.forEach(worksheetModel => {
       const {id, name, state} = worksheetModel;
-      const orderNo = value.sheets && value.sheets.findIndex((ws) => ws.id === id);
+      const orderNo = value.sheets && value.sheets.findIndex(ws => ws.id === id);
       const worksheet = (this._worksheets[id] = new Worksheet({
         id,
         name,