Add eslint/prettier (#145)

Add eslint/prettier

Author: kaiayoung

.eslintignore

@@ -0,0 +1,3 @@
+src/core/datagrid.ts
+src/core/graphicscontext.ts
+src/tests

.eslintrc.js

@@ -0,0 +1,19 @@
+module.exports = {
+    parser: '@typescript-eslint/parser', // Specifies the ESLint parser
+    parserOptions: {
+      ecmaVersion: 2020, // Allows for the parsing of modern ECMAScript features
+      sourceType: 'module', // Allows for the use of imports
+    },
+    extends: [
+      'plugin:@typescript-eslint/recommended', // Uses the recommended rules from @typescript-eslint/eslint-plugin
+      'prettier/@typescript-eslint', // Uses eslint-config-prettier to disable ESLint rules from @typescript-eslint/eslint-plugin that would conflict with prettier
+      'plugin:prettier/recommended', // Enables eslint-plugin-prettier and eslint-config-prettier. This will display prettier errors as ESLint errors. Make sure this is always the last configuration in the extends array.
+    ],
+    rules: {
+      // Place to specify ESLint rules. Can be used to overwrite rules specified from the extended configs
+    '@typescript-eslint/no-namespace': 'off',
+    '@typescript-eslint/no-var-requires': 'off',
+    '@typescript-eslint/ban-ts-comment': 'off'
+    },
+  };
+  

.gitignore

@@ -156,3 +156,6 @@ ipydatagrid/labextension/*.tgz
 
 # Packed lab extensions
 ipydatagrid/labextension
+
+conda_out
+recipe

.prettierrc.js

@@ -0,0 +1,7 @@
+module.exports = {
+    semi: true,
+    trailingComma: "all",
+    singleQuote: true,
+    printWidth: 80,
+    tabWidth: 2
+  };