prettier config

[Prettier][1] is an up-to date code formatter for JavaScript ecosystem.

For settings we rely on [EditorConfig][2] for things like tab style and
size (with added bonus that the code editor with an EditorConfig plugin
does some automated code formatting on file save for you). Unfortunately,
Prettier's Glob handling isn't great:
 1. `*.{ts,js,json}` has no effect
 2. Similarly, in a list of globs `*.ts,*.js,*.json` only the first glob
has an effect, the rest are ignored.
That's why the file looks the way it does.

The only other setting we change is line width. [Lukas][3] suggested we
use 100 instead of 80, because that's what Rustfmt is using.

[1]: https://prettier.io
[2]: https://editorconfig.org
[3]: https://github.com/Veykril

.editorconfig

@@ -0,0 +1,19 @@
+# https://EditorConfig.org
+root = true
+
+[*]
+charset = utf-8
+trim_trailing_whitespace = true
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+
+[*.{rs,toml}]
+indent_size = 4
+
+[*.ts]
+indent_size = 4
+[*.js]
+indent_size = 4
+[*.json]
+indent_size = 4

editors/code/.eslintrc.js

@@ -3,6 +3,7 @@ module.exports = {
         "es6": true,
         "node": true
     },
+    "extends": ["prettier"],
     "parser": "@typescript-eslint/parser",
     "parserOptions": {
         "project": "tsconfig.eslint.json",

editors/code/.prettierignore

@@ -0,0 +1,3 @@
+node_modules
+.vscode-test
+out

editors/code/.prettierrc.js

@@ -0,0 +1,5 @@
+module.exports = {
+    // use 100 because it's Rustfmt's default
+    // https://rust-lang.github.io/rustfmt/?version=v1.4.38&search=#max_width
+    printWidth: 100,
+};

editors/code/package-lock.json

@@ -22,6 +22,8 @@
                 "cross-env": "^7.0.3",
                 "esbuild": "^0.14.27",
                 "eslint": "^8.11.0",
+                "eslint-config-prettier": "^8.5.0",
+                "prettier": "^2.6.2",
                 "tslib": "^2.3.0",
                 "typescript": "^4.6.3",
                 "typescript-formatter": "^7.2.2",
@@ -1988,6 +1990,18 @@
                 "url": "https://opencollective.com/eslint"
             }
         },
+        "node_modules/eslint-config-prettier": {
+            "version": "8.5.0",
+            "resolved": "https://registry.npmjs.org/eslint-config-prettier/-/eslint-config-prettier-8.5.0.tgz",
+            "integrity": "sha512-obmWKLUNCnhtQRKc+tmnYuQl0pFU1ibYJQ5BGhTVB08bHe9wC8qUeG7c08dj9XX+AuPj1YSGSQIHl1pnDHZR0Q==",
+            "dev": true,
+            "bin": {
+                "eslint-config-prettier": "bin/cli.js"
+            },
+            "peerDependencies": {
+                "eslint": ">=7.0.0"
+            }
+        },
         "node_modules/eslint-scope": {
             "version": "5.1.1",
             "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-5.1.1.tgz",
@@ -3130,6 +3144,21 @@
                 "node": ">= 0.8.0"
             }
         },
+        "node_modules/prettier": {
+            "version": "2.6.2",
+            "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.6.2.tgz",
+            "integrity": "sha512-PkUpF+qoXTqhOeWL9fu7As8LXsIUZ1WYaJiY/a7McAQzxjk82OF0tibkFXVCDImZtWxbvojFjerkiLb0/q8mew==",
+            "dev": true,
+            "bin": {
+                "prettier": "bin-prettier.js"
+            },
+            "engines": {
+                "node": ">=10.13.0"
+            },
+            "funding": {
+                "url": "https://github.com/prettier/prettier?sponsor=1"
+            }
+        },
         "node_modules/process-nextick-args": {
             "version": "2.0.1",
             "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.1.tgz",
@@ -5509,6 +5538,13 @@
                 }
             }
         },
+        "eslint-config-prettier": {
+            "version": "8.5.0",
+            "resolved": "https://registry.npmjs.org/eslint-config-prettier/-/eslint-config-prettier-8.5.0.tgz",
+            "integrity": "sha512-obmWKLUNCnhtQRKc+tmnYuQl0pFU1ibYJQ5BGhTVB08bHe9wC8qUeG7c08dj9XX+AuPj1YSGSQIHl1pnDHZR0Q==",
+            "dev": true,
+            "requires": {}
+        },
         "eslint-scope": {
             "version": "5.1.1",
             "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-5.1.1.tgz",
@@ -6386,6 +6422,12 @@
             "integrity": "sha512-vkcDPrRZo1QZLbn5RLGPpg/WmIQ65qoWWhcGKf/b5eplkkarX0m9z8ppCat4mlOqUsWpyNuYgO3VRyrYHSzX5g==",
             "dev": true
         },
+        "prettier": {
+            "version": "2.6.2",
+            "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.6.2.tgz",
+            "integrity": "sha512-PkUpF+qoXTqhOeWL9fu7As8LXsIUZ1WYaJiY/a7McAQzxjk82OF0tibkFXVCDImZtWxbvojFjerkiLb0/q8mew==",
+            "dev": true
+        },
         "process-nextick-args": {
             "version": "2.0.1",
             "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.1.tgz",

editors/code/package.json

@@ -48,6 +48,8 @@
         "cross-env": "^7.0.3",
         "esbuild": "^0.14.27",
         "eslint": "^8.11.0",
+        "eslint-config-prettier": "^8.5.0",
+        "prettier": "^2.6.2",
         "tslib": "^2.3.0",
         "typescript": "^4.6.3",
         "typescript-formatter": "^7.2.2",