fix: lint rules

.eslintignore

@@ -1,3 +1,4 @@
 node_modules
 dist
 coverage
+**/*.d.ts

.eslintrc.js

@@ -14,4 +14,7 @@ module.exports = {
     commonjs: true,
     browser: true,
   },
+  rules: {
+    'prefer-template': 'error',
+  }
 };

__tests__/en-IN.spec.ts

@@ -34,7 +34,7 @@ testNegativeIntegers.map((row, i) => {
     return;
   }
   row[0] = -row[0];
-  row[1] = 'Minus ' + row[1];
+  row[1] = `Minus ${row[1]}`;
 });
 
 describe('Test Negative Integers with options = {}', () => {
@@ -45,7 +45,7 @@ describe('Test Negative Integers with options = {}', () => {
 
 const testIntegersWithCurrency = cloneDeep(testIntegers);
 testIntegersWithCurrency.map((row) => {
-  row[1] = row[1] + ` Rupees Only`
+  row[1] = `${row[1]} Rupees Only`;
 });
 
 describe('Test Integers with options = { currency: true }', () => {

__tests__/en-US.spec.ts

@@ -34,7 +34,7 @@ testNegativeIntegers.map((row, i) => {
     return;
   }
   row[0] = -row[0];
-  row[1] = 'Minus ' + row[1];
+  row[1] = `Minus ${row[1]}`;
 });
 
 describe('Test Negative Integers with options = {}', () => {
@@ -45,7 +45,7 @@ describe('Test Negative Integers with options = {}', () => {
 
 const testIntegersWithCurrency = cloneDeep(testIntegers);
 testIntegersWithCurrency.map((row) => {
-  row[1] = row[1] + ` Dollars Only`
+  row[1] = `${row[1]} Dollars Only`;
 });
 
 describe('Test Integers with options = { currency: true }', () => {

src/to-words.ts

@@ -73,8 +73,8 @@ export class ToWords {
       // Extra check for isFloat to overcome 1.999 rounding off to 2
       isFloat = this.isFloat(number);
       const isNumberZero = number >= 0 && number < 1;
-      const split = (number + '').split('.');
-      let words = this.convertInternal(Number(split[0]), options) + ` ${locale.currency.plural}`;
+      const split = (number.toString()).split('.');
+      let words = `${this.convertInternal(Number(split[0]), options)} ${locale.currency.plural}`;
 
       if (isNumberZero && options.ignoreZeroCurrency) {
         words = '';
@@ -85,12 +85,12 @@ export class ToWords {
         if (!isNumberZero || !options.ignoreZeroCurrency) {
           wordsWithDecimal += ` ${locale.texts.and} `;
         }
-        wordsWithDecimal += this.convertInternal(Number(split[1]) * Math.pow(10, 2 - split[1].length), options) + ` ${locale.currency.fractionalUnit.plural}`;
+        wordsWithDecimal += `${this.convertInternal(Number(split[1]) * Math.pow(10, 2 - split[1].length), options)} ${locale.currency.fractionalUnit.plural}`;
       }
       const isEmpty = words.length <= 0 && wordsWithDecimal.length <= 0;
       return (!isEmpty && isNegativeNumber ? `${locale.texts.minus} ` : '') + words + wordsWithDecimal + (!isEmpty ? ` ${locale.texts.only}` : '');
     } else {
-      const split = (number + '').split('.');
+      const split = (number.toString()).split('.');
 
       const words = this.convertInternal(Number(split[0]), options);
       let wordsWithDecimal = '';
@@ -126,16 +126,15 @@ export class ToWords {
       words += match.value;
       number -= match.number;
       if (number > 0) {
-        words += ' ' + this.convertInternal(number, options);
+        words += ` ${this.convertInternal(number, options)}`;
       }
     } else {
       const quotient = Math.floor(number / match.number);
       const remainder = number % match.number;
       if (remainder > 0) {
-        return this.convertInternal(quotient, options) + ' '
-          + match.value + ' ' + this.convertInternal(remainder, options);
+        return `${this.convertInternal(quotient, options)} ${match.value} ${this.convertInternal(remainder, options)}`
       } else {
-        return this.convertInternal(quotient, options) + ' ' + match.value;
+        return `${this.convertInternal(quotient, options)} ${match.value}`;
       }
     }
     return words;