chore: ease up used tooling

.editorconfig

@@ -1,17 +1,9 @@
 root = true
 
 [*]
-end_of_line = lf
-insert_final_newline = true
-
-[{*.{json,js,css},.*rc}]
 charset = utf-8
-indent_style = space
-indent_size = 4
-trim_trailing_whitespace = true
-
-[package.json]
-charset = utf-8
-indent_style = space
+end_of_line = lf
 indent_size = 2
+indent_style = space
+insert_final_newline = true
 trim_trailing_whitespace = true

.eslintrc.js

@@ -1,10 +1,12 @@
+"use strict";
+
 module.exports = {
-    extends: ['google', 'prettier'],
-    plugins: ['prettier'],
-    parserOptions: {
-        ecmaVersion: 2017
-    },
-    rules: {
-        'prettier/prettier': 'error'
-    }
+  extends: ["google", "prettier"],
+  plugins: ["prettier"],
+  parserOptions: {
+    ecmaVersion: 2017
+  },
+  rules: {
+    "prettier/prettier": "error"
+  }
 };

.travis.yml

@@ -1,9 +1,9 @@
 language: node_js
 node_js:
-    - 'node'
-    - 8
+  - "10"
+  - 8
 install:
-    - npm install
+  - npm install
 script:
-    - npm run lint
-    - npm test -- --ensure
+  - npm run lint
+  - npm test -- --ensure

CODE_OF_CONDUCT.md

@@ -8,19 +8,19 @@ In the interest of fostering an open and welcoming environment, we as contributo
 
 Examples of behavior that contributes to creating a positive environment include:
 
--   Using welcoming and inclusive language
--   Being respectful of differing viewpoints and experiences
--   Gracefully accepting constructive criticism
--   Focusing on what is best for the community
--   Showing empathy towards other community members
+- Using welcoming and inclusive language
+- Being respectful of differing viewpoints and experiences
+- Gracefully accepting constructive criticism
+- Focusing on what is best for the community
+- Showing empathy towards other community members
 
 Examples of unacceptable behavior by participants include:
 
--   The use of sexualized language or imagery and unwelcome sexual attention or advances
--   Trolling, insulting/derogatory comments, and personal or political attacks
--   Public or private harassment
--   Publishing others' private information, such as a physical or electronic address, without explicit permission
--   Other conduct which could reasonably be considered inappropriate in a professional setting
+- The use of sexualized language or imagery and unwelcome sexual attention or advances
+- Trolling, insulting/derogatory comments, and personal or political attacks
+- Public or private harassment
+- Publishing others' private information, such as a physical or electronic address, without explicit permission
+- Other conduct which could reasonably be considered inappropriate in a professional setting
 
 ## Our Responsibilities
 

CONTRIBUTING.md

@@ -8,19 +8,19 @@ You want do something for this repo? Nice and easy! And of course: you are the b
 
 If you report a bug, please try to:
 
--   Perform a web / GitHub search to avoid creating a duplicate ticket.
--   Include enough information to reproduce the problem.
--   Mention the exact version of the project causing you problems, as well as any related software and versions (such as operating system, browser, etc.).
--   Test against the latest version of the project (and if possible also the master branch) to see if the problem has already been fixed.
+- Perform a web / GitHub search to avoid creating a duplicate ticket.
+- Include enough information to reproduce the problem.
+- Mention the exact version of the project causing you problems, as well as any related software and versions (such as operating system, browser, etc.).
+- Test against the latest version of the project (and if possible also the master branch) to see if the problem has already been fixed.
 
 Once you have tried the above, create a GitHub issue notifying your bug report.
 
 ## Working in the code
 
 If you want to contribute code, please:
 
--   Write [good commit messages](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html), explain what your patch does, and why it is needed. How to is described in the [Commit changes chapter](#commit-changes).
--   Keep it simple: Any patch that changes a lot of code or is difficult to understand should be discussed before you put in the effort.
+- Write [good commit messages](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html), explain what your patch does, and why it is needed. How to is described in the [Commit changes chapter](#commit-changes).
+- Keep it simple: Any patch that changes a lot of code or is difficult to understand should be discussed before you put in the effort.
 
 Once you have tried the above, create a GitHub pull request with your changes changes and feel awesome 🎉.
 

README.md

@@ -8,12 +8,12 @@ The _StrexLang_ ("Strange expression language") is only used to train regular ex
 
 ## Contents
 
--   [Goal](#goal)
--   [Language](#language)
--   [How to start](#how-to-start)
-    -   [Installation](#installation)
-    -   [Start development](#start-development)
-    -   [Phases](#phases)
+- [Goal](#goal)
+- [Language](#language)
+- [How to start](#how-to-start)
+  - [Installation](#installation)
+  - [Start development](#start-development)
+  - [Phases](#phases)
 
 ---
 

docs/language.md

@@ -1,9 +1,9 @@
 ## Language
 
--   [Language](#language)
-    -   [Example](#example)
-    -   [Features](#features)
-    -   [AST](#ast)
+- [Language](#language)
+  - [Example](#example)
+  - [Features](#features)
+  - [AST](#ast)
 
 ---
 
@@ -30,25 +30,25 @@ _StrexLang_ is a very small language without any functions. It contains of expre
 
 #### Types
 
--   **Signed and unsigned integer** (e.g. `-3`, `0`, `23`)
-    -   Can be used as literal
--   **Signed and unsigned float** (e.g. `-3.2`, `0.1`, `23.9`)
-    -   Can be used as literal
--   **Implicit boolean** (`true` and `false`)
-    -   Can not be used as literal
-    -   Is only be used for compare results in `if`-statements
+- **Signed and unsigned integer** (e.g. `-3`, `0`, `23`)
+  - Can be used as literal
+- **Signed and unsigned float** (e.g. `-3.2`, `0.1`, `23.9`)
+  - Can be used as literal
+- **Implicit boolean** (`true` and `false`)
+  - Can not be used as literal
+  - Is only be used for compare results in `if`-statements
 
 #### Operator
 
--   `+` - Math operator for addition (works with Integer and Float)
--   `-` - Math operator for subtraction (works with Integer and Float)
--   `*` - Math operator for multiplication (works with Integer and Float)
--   `/` - Math operator for division (works with Integer and Float)
--   `|` - "Or" (alternate/pipe) operator (works with implicit boolean)
--   `&` - "And" (consequent) operator (works with implicit boolean)
--   `=` - Equals operator (works with Integer and Float to compare value)
--   `>` - Greater-than operator (works with Integer and Float to compare value)
--   `<` - Less-than operator (works with Integer and Float to compare value)
+- `+` - Math operator for addition (works with Integer and Float)
+- `-` - Math operator for subtraction (works with Integer and Float)
+- `*` - Math operator for multiplication (works with Integer and Float)
+- `/` - Math operator for division (works with Integer and Float)
+- `|` - "Or" (alternate/pipe) operator (works with implicit boolean)
+- `&` - "And" (consequent) operator (works with implicit boolean)
+- `=` - Equals operator (works with Integer and Float to compare value)
+- `>` - Greater-than operator (works with Integer and Float to compare value)
+- `<` - Less-than operator (works with Integer and Float to compare value)
 
 #### Calculation
 
@@ -109,95 +109,95 @@ the resulting AST would look like the following (defined as JSON):
 
 ```json
 {
-    "body": [
-        {
-            "type": "BinaryExpression",
-            "left": {
-                "type": "IntegerLiteral",
-                "value": "4"
-            },
-            "right": {
-                "type": "IntegerLiteral",
-                "value": "3"
-            },
-            "operator": "+"
+  "body": [
+    {
+      "type": "BinaryExpression",
+      "left": {
+        "type": "IntegerLiteral",
+        "value": "4"
+      },
+      "right": {
+        "type": "IntegerLiteral",
+        "value": "3"
+      },
+      "operator": "+"
+    },
+    {
+      "type": "IfExpression",
+      "test": {
+        "type": "BooleanExpression",
+        "left": {
+          "type": "LastExpression"
+        },
+        "right": {
+          "type": "IntegerLiteral",
+          "value": "7"
         },
-        {
-            "type": "IfExpression",
-            "test": {
-                "type": "BooleanExpression",
-                "left": {
-                    "type": "LastExpression"
-                },
-                "right": {
-                    "type": "IntegerLiteral",
-                    "value": "7"
-                },
-                "operator": "="
-            },
-            "consequent": {
-                "type": "BinaryExpression",
-                "left": {
-                    "type": "LastExpression"
-                },
-                "right": {
-                    "type": "IntegerLiteral",
-                    "value": "5"
-                },
-                "operator": "+"
-            },
-            "alternate": {
-                "type": "BinaryExpression",
-                "left": {
-                    "type": "LastExpression"
-                },
-                "right": {
-                    "type": "IntegerLiteral",
-                    "value": "4"
-                },
-                "operator": "-"
-            }
+        "operator": "="
+      },
+      "consequent": {
+        "type": "BinaryExpression",
+        "left": {
+          "type": "LastExpression"
         },
-        {
-            "type": "BinaryExpression",
-            "left": {
-                "type": "LastExpression"
-            },
-            "right": {
-                "type": "IntegerLiteral",
-                "value": "2"
-            },
-            "operator": "-"
+        "right": {
+          "type": "IntegerLiteral",
+          "value": "5"
         },
-        {
-            "type": "PrintOut"
-        }
-    ]
+        "operator": "+"
+      },
+      "alternate": {
+        "type": "BinaryExpression",
+        "left": {
+          "type": "LastExpression"
+        },
+        "right": {
+          "type": "IntegerLiteral",
+          "value": "4"
+        },
+        "operator": "-"
+      }
+    },
+    {
+      "type": "BinaryExpression",
+      "left": {
+        "type": "LastExpression"
+      },
+      "right": {
+        "type": "IntegerLiteral",
+        "value": "2"
+      },
+      "operator": "-"
+    },
+    {
+      "type": "PrintOut"
+    }
+  ]
 }
 ```
 
 Step by step the AST is defined as follows. It starts with the actual program body without any comments:
 
 ```json
 {
-    "body": []
+  "body": []
 }
 ```
 
 The `body` array contains any defined statement and expression of the program line by line. Where the first is the definition for an expression:
 
 ```json
 {
-    "type": "BinaryExpression",
-    "left": {
-        "type": "IntegerLiteral",
-        "value": "4"
-    },
-    "right": {
-        "type": "IntegerLiteral",
-        "value": "3"
-    },
-    "operator": "+"
+  "type": "BinaryExpression",
+  "left": {
+    "type": "IntegerLiteral",
+    "value": "4"
+  },
+  "right": {
+    "type": "IntegerLiteral",
+    "value": "3"
+  },
+  "operator": "+"
 }
 ```
 
@@ -249,23 +249,23 @@ The next line uses the last expression as left hand to assign the operator `-` w
 
 ```json
 {
-    "type": "BinaryExpression",
-    "left": {
-        "type": "LastExpression"
-    },
-    "right": {
-        "type": "IntegerLiteral",
-        "value": "2"
-    },
-    "operator": "-"
+  "type": "BinaryExpression",
+  "left": {
+    "type": "LastExpression"
+  },
+  "right": {
+    "type": "IntegerLiteral",
+    "value": "2"
+  },
+  "operator": "-"
 }
 ```
 
 The last statement is the "empty line" that results in a print out to the stdout:
 
 ```json
 {
-    "type": "PrintOut"
+  "type": "PrintOut"
 }
 ```