Enhance cell customization - add data-base64-xlsx-cell-config

src/index.js

@@ -136,6 +136,16 @@ module.exports = (html, callback, options = {}) => {
             cell.hMerge = cs - 1;
           }
 
+          // In case you need the flexibility to config all possible
+          //  _value, formula, numFmt, cellType...
+          const b64Config = $td.attr('data-base64-xlsx-cell-config');
+          if (b64Config) {
+            try {
+              const configStr = Buffer.from(b64Config, 'base64').toString('utf-8');
+              Object.assign(cell, JSON.parse(configStr));
+            } catch (e) {}
+          }
+
           for (let r = 0; r < rs; r++) {
             if (offsets[hi + r] === undefined) {
               offsets[hi + r] = 0;

test/index.test.js

@@ -346,4 +346,59 @@ describe('Test: index.js', () => {
         });
     });
   });
+
+  it('should htmlToXlsx data base64 cell config ok', (done) => {
+    /* eslint-disable no-useless-escape */
+    const btoa = str => Buffer.from(str, 'utf-8').toString('base64');
+    const object2b64 = obj => btoa(JSON.stringify(obj));
+    const cells = [0, 1, 10, 100, 1000, 10000, 100000, NaN].map(amount => ({
+      numFmt: '"$"#,##0.00;[Red]\-"$"#,##0.00',
+      cellType: 'TypeNumeric',
+      _value: amount
+    }));
+    const body = cells.map(cell => `
+      <tr>
+        <td data-base64-xlsx-cell-config="${object2b64(cell)}"></td>
+      </tr>
+    `).concat(`
+      <tr>
+        <td data-base64-xlsx-cell-config="Trigger Base 64 parse Error"></td>
+      </tr>
+    `, `
+      <tr>
+        <td data-base64-xlsx-cell-config="${btoa('Trigger JSON parse Error')}"></td>
+      </tr>
+    `);
+
+    htmlTo(`
+      <style type="text/css">
+        table th, table td {
+          width: 400px;
+          height: 50px;
+          vertical-align: middle;
+          text-align: right;
+        }
+      </style>
+      <table>
+        ${body}
+      </table>
+    `, (err, file) => {
+      if (err) return done(err);
+
+      const tmpfile = join(tmpdir(), 'data-base64-cell-config.xlsx');
+      const expfile = join(__dirname, 'expect/data-base64-cell-config.xlsx');
+      file
+        .saveAs()
+        .pipe(fs.createWriteStream(tmpfile))
+        .on('finish', () => {
+          const expectFile = fs.createReadStream(expfile);
+          const actualFile = fs.createReadStream(tmpfile);
+          streamEqual(expectFile, actualFile, function (err, ok) {
+            expect(err).to.be.null;
+            expect(ok).to.be.true;
+            done();
+          });
+        });
+    });
+  });
 });