Add CI to check code format

Signed-off-by: Sebastian Martinez <sebastinez@me.com>

.eslintignore

@@ -0,0 +1 @@
+node_modules

.eslintrc.js

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+module.exports = {
+  env: {
+    browser: true,
+    node: true,
+  },
+  extends: [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended"
+  ],
+  parser: "@typescript-eslint/parser",
+  parserOptions: {
+    ecmaVersion: 12,
+    sourceType: "module",
+  },
+  plugins: [
+    "svelte3",
+    "@typescript-eslint"
+  ],
+  overrides: [
+    {
+      files: ["*.svelte"],
+      processor: "svelte3/svelte3",
+    }
+  ],
+  rules: {
+    "@typescript-eslint/no-explicit-any": "off",
+    indent: ["error", 2, { "SwitchCase": 1 }]
+  },
+  settings: {
+    "svelte3/typescript": true, 
+  },
+};

.github/workflows/check-format.yml

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+name: check-format
+on: [push]
+
+jobs:
+  check-format:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+      - run: npm ci
+      - run: ./scripts/check-format
+        shell: bash

scripts/check-format

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+#!/bin/sh
+
+# Checks local /node_modules,
+# if not found will download that package and execute it.
+# Does not modify files, informs bad code format
+npx eslint .