diff --git a/CHANGELOG.md b/CHANGELOG.md
index 93b4f61..0191fff 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## 1.9.0
+- Add Terraform support
+
 ## 1.8.0
 - Add julia support (txh to [sbromberger](https://github.com/sbromberger))
 
diff --git a/README.md b/README.md
index 8d72b60..c390ffd 100644
--- a/README.md
+++ b/README.md
@@ -71,6 +71,7 @@ SQL | mysql,sqlite,psql | dash.docset.sql
 Stylus | stylus | dash.docset.stylus | [link](https://marketplace.visualstudio.com/items?itemName=sysoev.language-stylus)
 Swift | swift,iphoneos,macosx,watchos,tvos,appledoc | dash.docset.swift | [link](https://marketplace.visualstudio.com/items?itemName=rlovelett.vscode-swift-language)
 Tcl | tcl | dash.docset.tcl | [link](https://marketplace.visualstudio.com/items?itemName=rashwell.tcl)
+Terraform | terraform | dash.docset.terraform | [link](https://marketplace.visualstudio.com/items?itemName=mauve.terraform)
 TypeScript | typescript | dash.docset.typescript
 YAML | chef,ansible | dash.docset.yaml
 
diff --git a/package.json b/package.json
index f51a519..6a474fe 100644
--- a/package.json
+++ b/package.json
@@ -21,9 +21,7 @@
     "type": "git",
     "url": "https://github.com/deerawan/vscode-dash"
   },
-  "categories": [
-    "Other"
-  ],
+  "categories": ["Other"],
   "activationEvents": [
     "onCommand:extension.dash.all",
     "onCommand:extension.dash.specific",
@@ -32,8 +30,7 @@
   ],
   "main": "./out/src/extension",
   "contributes": {
-    "commands": [
-      {
+    "commands": [{
         "command": "extension.dash.specific",
         "title": "Search in Dash for current selection"
       },
@@ -50,8 +47,7 @@
         "title": "Search in Dash for a custom string"
       }
     ],
-    "keybindings": [
-      {
+    "keybindings": [{
         "command": "extension.dash.specific",
         "key": "ctrl+h",
         "mac": "ctrl+h",
@@ -100,18 +96,14 @@
           "items": {
             "type": "string"
           },
-          "default": [
-            "clojure"
-          ]
+          "default": ["clojure"]
         },
         "dash.docset.coffee": {
           "type": "array",
           "items": {
             "type": "string"
           },
-          "default": [
-            "coffee"
-          ]
+          "default": ["coffee"]
         },
         "dash.docset.cpp": {
           "type": "array",
@@ -134,77 +126,56 @@
           "items": {
             "type": "string"
           },
-          "default": [
-            "net",
-            "mono",
-            "unity3d"
-          ]
+          "default": ["net", "mono", "unity3d"]
         },
         "dash.docset.dart": {
           "type": "array",
           "items": {
             "type": "string"
           },
-          "default": [
-            "dartlang",
-            "polymerdart",
-            "angulardart"
-          ]
+          "default": ["dartlang", "polymerdart", "angulardart"]
         },
         "dash.docset.elixir": {
           "type": "array",
           "items": {
             "type": "string"
           },
-          "default": [
-            "elixir"
-          ]
+          "default": ["elixir"]
         },
         "dash.docset.elm": {
           "type": "array",
           "items": {
             "type": "string"
           },
-          "default": [
-            "elm"
-          ]
+          "default": ["elm"]
         },
         "dash.docset.erlang": {
           "type": "array",
           "items": {
             "type": "string"
           },
-          "default": [
-            "erlang"
-          ]
+          "default": ["erlang"]
         },
         "dash.docset.go": {
           "type": "array",
           "items": {
             "type": "string"
           },
-          "default": [
-            "go",
-            "godoc"
-          ]
+          "default": ["go", "godoc"]
         },
         "dash.docset.haskell": {
           "type": "array",
           "items": {
             "type": "string"
           },
-          "default": [
-            "haskell"
-          ]
+          "default": ["haskell"]
         },
         "dash.docset.haml": {
           "type": "array",
           "items": {
             "type": "string"
           },
-          "default": [
-            "haml"
-          ]
+          "default": ["haml"]
         },
         "dash.docset.html": {
           "type": "array",
@@ -246,9 +217,7 @@
           "items": {
             "type": "string"
           },
-          "default": [
-            "jade"
-          ]
+          "default": ["jade"]
         },
         "dash.docset.java": {
           "type": "array",
@@ -322,9 +291,7 @@
           "items": {
             "type": "string"
           },
-          "default": [
-            "react"
-          ]
+          "default": ["react"]
         },
         "dash.docset.julia": {
           "type": "array",
@@ -340,28 +307,21 @@
           "items": {
             "type": "string"
           },
-          "default": [
-            "less"
-          ]
+          "default": ["less"]
         },
         "dash.docset.lua": {
           "type": "array",
           "items": {
             "type": "string"
           },
-          "default": [
-            "lua",
-            "corona"
-          ]
+          "default": ["lua", "corona"]
         },
         "dash.docset.markdown": {
           "type": "array",
           "items": {
             "type": "string"
           },
-          "default": [
-            "markdown"
-          ]
+          "default": ["markdown"]
         },
         "dash.docset.objective-c": {
           "type": "array",
@@ -387,10 +347,7 @@
           "items": {
             "type": "string"
           },
-          "default": [
-            "perl",
-            "manpages"
-          ]
+          "default": ["perl", "manpages"]
         },
         "dash.docset.php": {
           "type": "array",
@@ -429,18 +386,14 @@
           "items": {
             "type": "string"
           },
-          "default": [
-            "processing"
-          ]
+          "default": ["processing"]
         },
         "dash.docset.puppet": {
           "type": "array",
           "items": {
             "type": "string"
           },
-          "default": [
-            "puppet"
-          ]
+          "default": ["puppet"]
         },
         "dash.docset.python": {
           "type": "array",
@@ -468,84 +421,56 @@
           "items": {
             "type": "string"
           },
-          "default": [
-            "r"
-          ]
+          "default": ["r"]
         },
         "dash.docset.ruby": {
           "type": "array",
           "items": {
             "type": "string"
           },
-          "default": [
-            "ruby",
-            "rubygems",
-            "rails"
-          ]
+          "default": ["ruby", "rubygems", "rails"]
         },
         "dash.docset.rust": {
           "type": "array",
           "items": {
             "type": "string"
           },
-          "default": [
-            "rust"
-          ]
+          "default": ["rust"]
         },
         "dash.docset.sass": {
           "type": "array",
           "items": {
             "type": "string"
           },
-          "default": [
-            "sass",
-            "compass",
-            "bourbon",
-            "neat",
-            "susy",
-            "css"
-          ]
+          "default": ["sass", "compass", "bourbon", "neat", "susy", "css"]
         },
         "dash.docset.scala": {
           "type": "array",
           "items": {
             "type": "string"
           },
-          "default": [
-            "scala",
-            "akka",
-            "playscala"
-          ]
+          "default": ["scala", "akka", "playscala"]
         },
         "dash.docset.shellscript": {
           "type": "array",
           "items": {
             "type": "string"
           },
-          "default": [
-            "bash",
-            "manpages"
-          ]
+          "default": ["bash", "manpages"]
         },
         "dash.docset.sql": {
           "type": "array",
           "items": {
             "type": "string"
           },
-          "default": [
-            "mysql",
-            "sqlite",
-            "psql"
-          ]
+          "default": ["mysql", "sqlite", "psql"]
         },
         "dash.docset.stylus": {
           "type": "array",
           "items": {
             "type": "string"
           },
-          "default": [
-            "stylus"
-          ]
+          "default": ["stylus"]
         },
         "dash.docset.swift": {
           "type": "array",
@@ -566,38 +491,35 @@
           "items": {
             "type": "string"
           },
-          "default": [
-            "tcl"
-          ]
+          "default": ["tcl"]
         },
         "dash.docset.typescript": {
           "type": "array",
           "items": {
             "type": "string"
           },
-          "default": [
-            "typescript",
-            "javascript"
-          ]
+          "default": ["typescript", "javascript"]
         },
         "dash.docset.yaml": {
           "type": "array",
           "items": {
             "type": "string"
           },
-          "default": [
-            "chef",
-            "ansible"
-          ]
+          "default": ["chef", "ansible"]
         },
         "dash.docset.haxe": {
           "type": "array",
           "items": {
             "type": "string"
           },
-          "default": [
-            "haxe"
-          ]
+          "default": ["haxe"]
+        },
+        "dash.docset.terraform": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          },
+          "default": ["terraform"]
         }
       }
     }
@@ -628,13 +550,7 @@
     "vscode": "0.10.x"
   },
   "lint-staged": {
-    "*.{ts,json}": [
-      "prettier",
-      "git add"
-    ],
-    "*.ts": [
-      "tslint --fix",
-      "tslint"
-    ]
+    "*.{ts,json}": ["prettier", "git add"],
+    "*.ts": ["tslint --fix", "tslint"]
   }
 }
diff --git a/src/dash.ts b/src/dash.ts
index 11816d8..4f193a6 100644
--- a/src/dash.ts
+++ b/src/dash.ts
@@ -23,7 +23,7 @@ export class Dash {
    */
   getCommand(query: string, docsets: string[] = []): string {
     let uri = 'dash-plugin://query=' + encodeURIComponent(query);
-    let keys = this.getKeys(docsets);
+    const keys = this.getKeys(docsets);
 
     if (keys) {
       uri += '&keys=' + keys;
diff --git a/src/extension.ts b/src/extension.ts
index 186aaae..556eb2e 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -43,12 +43,12 @@ export function activate(context: ExtensionContext) {
  * Search in dash for selection syntax documentation
  */
 function searchSpecific() {
-  let editor = getEditor();
-  let query = getSelectedText(editor);
-  let languageId = editor.document.languageId;
-  let docsets = getDocsets(languageId);
+  const editor = getEditor();
+  const query = getSelectedText(editor);
+  const languageId = editor.document.languageId;
+  const docsets = getDocsets(languageId);
 
-  let dash = new Dash(OS);
+  const dash = new Dash(OS);
 
   exec(dash.getCommand(query, docsets));
 }
@@ -57,9 +57,9 @@ function searchSpecific() {
  * Search in dash for all documentation
  */
 function searchAll() {
-  let editor = getEditor();
-  let query = getSelectedText(editor);
-  let dash = new Dash(OS);
+  const editor = getEditor();
+  const query = getSelectedText(editor);
+  const dash = new Dash(OS);
 
   exec(dash.getCommand(query));
 }
@@ -68,11 +68,11 @@ function searchAll() {
  * Search in dash for editor syntax documentation
  */
 function searchEmptySyntax() {
-  let editor = getEditor();
-  let query = '';
-  let languageId = editor.document.languageId;
-  let docsets = getDocsets(languageId);
-  let dash = new Dash(OS);
+  const editor = getEditor();
+  const query = '';
+  const languageId = editor.document.languageId;
+  const docsets = getDocsets(languageId);
+  const dash = new Dash(OS);
 
   exec(dash.getCommand(query, docsets));
 }
@@ -81,12 +81,12 @@ function searchEmptySyntax() {
  * Search in dash for editor syntax documentation with a custom query
  */
 function searchCustomWithSyntax() {
-  let editor = getEditor();
-  let languageId = editor.document.languageId;
-  let docsets = getDocsets(languageId);
-  let dash = new Dash(OS);
+  const editor = getEditor();
+  const languageId = editor.document.languageId;
+  const docsets = getDocsets(languageId);
+  const dash = new Dash(OS);
 
-  let inputOptions: InputBoxOptions = {
+  const inputOptions: InputBoxOptions = {
     placeHolder: 'Something to search in Dash.',
     prompt: 'Enter something to search for in Dash.',
   };
@@ -105,7 +105,7 @@ function searchCustomWithSyntax() {
  * @return {TextEditor}
  */
 function getEditor(): TextEditor {
-  let editor = window.activeTextEditor;
+  const editor = window.activeTextEditor;
   if (!editor) {
     return;
   }
@@ -120,11 +120,11 @@ function getEditor(): TextEditor {
  * @return {string}
  */
 function getSelectedText(editor: TextEditor) {
-  let selection = editor.selection;
+  const selection = editor.selection;
   let text = editor.document.getText(selection);
 
   if (!text) {
-    let range = editor.document.getWordRangeAtPosition(selection.active);
+    const range = editor.document.getWordRangeAtPosition(selection.active);
     text = editor.document.getText(range);
   }
 
@@ -138,7 +138,7 @@ function getSelectedText(editor: TextEditor) {
  * @return {Array<string>}
  */
 function getDocsets(languageId: string): Array<string> {
-  let config = workspace.getConfiguration('dash.docset');
+  const config = workspace.getConfiguration('dash.docset');
 
   if (config[languageId]) {
     return config[languageId];
diff --git a/test/extension.test.ts b/test/extension.test.ts
index 5473056..938becc 100644
--- a/test/extension.test.ts
+++ b/test/extension.test.ts
@@ -3,22 +3,22 @@ import { Dash } from '../src/dash';
 
 suite('Dash Tests', () => {
   test('Get command with keys for macOS', () => {
-    let dash = new Dash('darwin');
-    let uri = dash.getCommand('size', ['css', 'less']);
+    const dash = new Dash('darwin');
+    const uri = dash.getCommand('size', ['css', 'less']);
 
     assert.equal(uri, 'open -g "dash-plugin://query=size&keys=css,less"');
   });
 
   test('Get command with no keys for macOS', () => {
-    let dash = new Dash('darwin');
-    let uri = dash.getCommand('size');
+    const dash = new Dash('darwin');
+    const uri = dash.getCommand('size');
 
     assert.equal(uri, 'open -g "dash-plugin://query=size"');
   });
 
   test('Get command with keys for Windows', () => {
-    let dash = new Dash('win32');
-    let uri = dash.getCommand('size', ['css', 'less']);
+    const dash = new Dash('win32');
+    const uri = dash.getCommand('size', ['css', 'less']);
 
     assert.equal(
       uri,
@@ -27,36 +27,36 @@ suite('Dash Tests', () => {
   });
 
   test('Get command with no keys for Windows', () => {
-    let dash = new Dash('win32');
-    let uri = dash.getCommand('size');
+    const dash = new Dash('win32');
+    const uri = dash.getCommand('size');
 
     assert.equal(uri, 'start dash-plugin:// && start dash-plugin://query=size');
   });
 
   test('Get command with keys for Linux', () => {
-    let dash = new Dash('linux');
-    let uri = dash.getCommand('size', ['css', 'less']);
+    const dash = new Dash('linux');
+    const uri = dash.getCommand('size', ['css', 'less']);
 
     assert.equal(uri, 'zeal "dash-plugin://query=size&keys=css,less"');
   });
 
   test('Get command with no keys for Linux', () => {
-    let dash = new Dash('linux');
-    let uri = dash.getCommand('size');
+    const dash = new Dash('linux');
+    const uri = dash.getCommand('size');
 
     assert.equal(uri, 'zeal "dash-plugin://query=size"');
   });
 
   test('Get keys with exist docset', () => {
-    let dash = new Dash('darwin');
-    let keys = dash.getKeys(['css', 'less']);
+    const dash = new Dash('darwin');
+    const keys = dash.getKeys(['css', 'less']);
 
     assert.equal(keys, 'css,less');
   });
 
   test('Get keys with empty docset', () => {
-    let dash = new Dash('darwin');
-    let keys = dash.getKeys([]);
+    const dash = new Dash('darwin');
+    const keys = dash.getKeys([]);
 
     assert.equal(keys, '');
   });
diff --git a/tslint.json b/tslint.json
index 75c9086..4deb1d0 100644
--- a/tslint.json
+++ b/tslint.json
@@ -1,101 +1,58 @@
 {
-    "jsRules": {
-        "class-name": true,
-        "comment-format": [
-            true,
-            "check-space"
-        ],
-        "indent": [
-            true,
-            "spaces"
-        ],
-        "no-duplicate-variable": true,
-        "no-eval": true,
-        "no-trailing-whitespace": true,
-        "no-unsafe-finally": true,
-        "one-line": [
-            true,
-            "check-open-brace",
-            "check-whitespace"
-        ],
-        "quotemark": [
-            true,
-            "double"
-        ],
-        "semicolon": [
-            true,
-            "always"
-        ],
-        "triple-equals": [
-            true,
-            "allow-null-check"
-        ],
-        "variable-name": [
-            true,
-            "ban-keywords"
-        ],
-        "whitespace": [
-            true,
-            "check-branch",
-            "check-decl",
-            "check-operator",
-            "check-separator",
-            "check-type"
-        ]
-    },
-    "rules": {
-        "class-name": true,
-        "comment-format": [
-            true,
-            "check-space"
-        ],
-        "indent": [
-            true,
-            "spaces"
-        ],
-        "no-eval": true,
-        "no-internal-module": true,
-        "no-trailing-whitespace": true,
-        "no-unsafe-finally": true,
-        "no-var-keyword": true,
-        "one-line": [
-            true,
-            "check-open-brace",
-            "check-whitespace"
-        ],
-        "quotemark": [
-            true,
-            "single"
-        ],
-        "semicolon": [
-            true,
-            "always"
-        ],
-        "triple-equals": [
-            true,
-            "allow-null-check"
-        ],
-        "typedef-whitespace": [
-            true,
-            {
-                "call-signature": "nospace",
-                "index-signature": "nospace",
-                "parameter": "nospace",
-                "property-declaration": "nospace",
-                "variable-declaration": "nospace"
-            }
-        ],
-        "variable-name": [
-            true,
-            "ban-keywords"
-        ],
-        "whitespace": [
-            true,
-            "check-branch",
-            "check-decl",
-            "check-operator",
-            "check-separator",
-            "check-type"
-        ]
-    }
+  "jsRules": {
+    "class-name": true,
+    "comment-format": [true, "check-space"],
+    "indent": [true, "spaces"],
+    "no-duplicate-variable": true,
+    "no-eval": true,
+    "no-trailing-whitespace": true,
+    "no-unsafe-finally": true,
+    "one-line": [true, "check-open-brace", "check-whitespace"],
+    "quotemark": [true, "double"],
+    "semicolon": [true, "always"],
+    "triple-equals": [true, "allow-null-check"],
+    "variable-name": [true, "ban-keywords"],
+    "whitespace": [
+      true,
+      "check-branch",
+      "check-decl",
+      "check-operator",
+      "check-separator",
+      "check-type"
+    ]
+  },
+  "rules": {
+    "class-name": true,
+    "comment-format": [true, "check-space"],
+    "indent": [true, "spaces"],
+    "no-eval": true,
+    "no-internal-module": true,
+    "no-trailing-whitespace": true,
+    "no-unsafe-finally": true,
+    "no-var-keyword": true,
+    "prefer-const": true,
+    "one-line": [true, "check-open-brace", "check-whitespace"],
+    "quotemark": [true, "single"],
+    "semicolon": [true, "always"],
+    "triple-equals": [true, "allow-null-check"],
+    "typedef-whitespace": [
+      true,
+      {
+        "call-signature": "nospace",
+        "index-signature": "nospace",
+        "parameter": "nospace",
+        "property-declaration": "nospace",
+        "variable-declaration": "nospace"
+      }
+    ],
+    "variable-name": [true, "ban-keywords"],
+    "whitespace": [
+      true,
+      "check-branch",
+      "check-decl",
+      "check-operator",
+      "check-separator",
+      "check-type"
+    ]
+  }
 }