Use es5 as the TypeScript target

.travis.yml

@@ -2,3 +2,4 @@ language: node_js
 
 node_js:
   - '6'
+  - '4'

package.json

@@ -25,6 +25,7 @@
   "license": "MIT",
   "devDependencies": {
     "chai": "^3.5.0",
+    "es6-promise": "^4.0.4",
     "gulp": "^3.9.1",
     "gulp-sourcemaps": "^1.6.0",
     "gulp-spawn-mocha": "^2.2.2",

src/readme/fetch.ts

@@ -1,3 +1,4 @@
+import { Promise } from 'es6-promise';
 import * as https from 'https';
 import { ruleTSMap, ruleESMap, toCamelCase } from './rules';
 

src/readme/index.ts

@@ -1,3 +1,4 @@
+import { Promise } from 'es6-promise';
 import * as fs from 'fs';
 import * as path from 'path';
 import { IRule, categories, rules, ruleTSMap } from './rules';
@@ -98,7 +99,7 @@ function updateRuleFiles(cb: Function) {
     file => fs.lstatSync(path.join(ruleDir, file)).isFile()
   );
   const ruleNames = allFiles
-    .filter(name => name.endsWith('.ts'))
+    .filter(name => /\.ts$/.test(name))
     .map(name => name.substr(0, name.length - 7));
   const allPromises = [];
   ruleNames.forEach((name) => {

src/rules/noDuplicateCaseRule.ts

@@ -17,16 +17,16 @@ class NoDuplicateCaseWalker extends Lint.RuleWalker {
   }
 
   private validateNoDupeCase(node: ts.SwitchStatement) {
-    const cases = new Map<string, ts.CaseClause>();
+    const cases = Object.create(null);
 
     node.caseBlock.clauses.forEach(clause => {
       if (clause.kind === ts.SyntaxKind.CaseClause) {
         const key = clause.getText();
-        if (cases.has(key)) {
+        if (cases[key]) {
           this.addFailure(this.createFailure(node.getStart(), node.getWidth(), Rule.FAILURE_STRING));
         }
         else {
-          cases.set(key, clause as ts.CaseClause);
+          cases[key] = clause as ts.CaseClause;
         }
       }
     });

src/rules/noExtraBooleanCastRule.ts

@@ -60,10 +60,10 @@ class NoExtraBooleanCastWalker extends Lint.RuleWalker {
     else if (grandparent.kind === ts.SyntaxKind.PrefixUnaryExpression && (grandparent as ts.PrefixUnaryExpression).operator === ts.SyntaxKind.ExclamationToken) {
       this.addFailure(this.createFailure(node.getStart(), node.getWidth(), Rule.FAILURE_STRING.unaryCast));
     }
-    else if (grandparent.kind === ts.SyntaxKind.CallExpression && grandparent.getText().startsWith('Boolean')) {
+    else if (grandparent.kind === ts.SyntaxKind.CallExpression && /^Boolean/.test(grandparent.getText())) {
       this.addFailure(this.createFailure(node.getStart(), node.getWidth(), Rule.FAILURE_STRING.objectCast));
     }
-    else if (grandparent.kind === ts.SyntaxKind.NewExpression && grandparent.getText().startsWith('new Boolean')) {
+    else if (grandparent.kind === ts.SyntaxKind.NewExpression && /^new Boolean/.test(grandparent.getText())) {
       this.addFailure(this.createFailure(node.getStart(), node.getWidth(), Rule.FAILURE_STRING.newCast));
     }
   }

src/rules/noExtraSemiRule.ts

@@ -38,7 +38,9 @@ class NoExtraSemiWalker extends Lint.RuleWalker {
   }
 
   private checkClass(node: ts.ClassDeclaration) {
-    const children = node.getChildren().slice(node.getChildren().indexOf(node.getChildren().find(child => child.kind === ts.SyntaxKind.FirstPunctuation)));
+    const indexOf = node.getChildren().map(child => child.kind).indexOf(ts.SyntaxKind.FirstPunctuation);
+    const children = node.getChildren().slice(indexOf);
+
     this.checkClassChildren(children);
   }
 

src/rules/validJsdocRule.ts

@@ -152,7 +152,7 @@ class ValidJsdocWalker extends Lint.SkippableTokenAwareRuleWalker {
       ts.SyntaxKind.VariableStatement
     ];
 
-    if (!node.getFullText().trim().startsWith('/**')) {
+    if (!/^\/\*\*/.test(node.getFullText().trim())) {
       if (ALLOWED_PARENTS.indexOf(node.parent.kind) !== -1) {
         return this.getJSDocComment(node.parent);
       }
@@ -166,7 +166,7 @@ class ValidJsdocWalker extends Lint.SkippableTokenAwareRuleWalker {
     let start = node.pos;
     let width = comments.length;
 
-    if (!comments.startsWith('/**') || !comments.endsWith('*/')) {
+    if (!/^\/\*\*/.test(comments) || !/\*\/$/.test(comments)) {
       return {};
     }
 
@@ -198,7 +198,7 @@ class ValidJsdocWalker extends Lint.SkippableTokenAwareRuleWalker {
       return;
     }
 
-    const fn = this.fns.find(f => node === f.node);
+    let fn = this.fns.filter(f => node === f.node)[0];
     let params = {};
     let hasReturns = false;
     let hasConstructor = false;

tsconfig.json

@@ -1,6 +1,6 @@
 {
   "compilerOptions": {
-    "target": "es6",
+    "target": "es5",
     "module": "commonjs",
     "removeComments": true
   }