Replace Prettier with Biome

biome.json

@@ -0,0 +1,73 @@
+{
+    "$schema": "https://biomejs.dev/schemas/2.3.13/schema.json",
+    "assist": {
+        "actions": {
+            "source": { "organizeImports": "off" }
+        },
+        "enabled": true
+    },
+    "files": { "ignoreUnknown": false },
+    "formatter": {
+        "attributePosition": "auto",
+        "bracketSameLine": false,
+        "bracketSpacing": true,
+        "enabled": true,
+        "expand": "auto",
+        "formatWithErrors": false,
+        "includes": [
+            "**",
+            "!**/*.el",
+            "!**/*.ico",
+            "!**/*.jpg",
+            "!**/*.png",
+            "!**/*.svg",
+            "!**/*.ttf",
+            "!**/*.txt",
+            "!**/*.generator",
+            "!**/*.local",
+            "!**/*~",
+            "!**/.env",
+            "!**/.env.*",
+            "!.github/workflows",
+            "!**/.gitignore",
+            "!**/.husky",
+            "!**/.prettierignore",
+            "!**/.vscode",
+            "!**/coverage",
+            "!**/dist",
+            "!**/index.html",
+            "!**/node_modules",
+            "!**/package-lock.json",
+            "!e2e/*-snapshots",
+            "!e2e/results",
+            "!**/site"
+        ],
+        "indentStyle": "space",
+        "indentWidth": 4,
+        "lineEnding": "lf",
+        "lineWidth": 78,
+        "useEditorconfig": true
+    },
+    "html": {
+        "formatter": {
+            "indentScriptAndStyle": true,
+            "selfCloseVoidElements": "always"
+        }
+    },
+    "javascript": {
+        "formatter": {
+            "arrowParentheses": "asNeeded",
+            "attributePosition": "auto",
+            "bracketSameLine": false,
+            "bracketSpacing": false,
+            "jsxQuoteStyle": "double",
+            "operatorLinebreak": "before",
+            "quoteProperties": "asNeeded",
+            "quoteStyle": "single",
+            "semicolons": "asNeeded",
+            "trailingCommas": "es5"
+        }
+    },
+    "linter": { "enabled": false },
+    "vcs": { "clientKind": "git", "enabled": true, "useIgnoreFile": true }
+}

package.json

@@ -99,6 +99,7 @@
         "vue-router": "^4.5.0"
     },
     "devDependencies": {
+        "@biomejs/biome": "2.3.13",
         "@eslint/js": "^9.10.0",
         "@playwright/browser-chromium": "^1.46.1",
         "@playwright/browser-firefox": "^1.46.1",

src/sequences/simpleFactor.ts

@@ -12,6 +12,7 @@ import type {Factorization} from './SequenceInterface'
 // up to a million. (Since otherwise prettier insists on just one bigint
 // per line, we mark the list as follows:)
 // prettier-ignore
+// biome-ignore format: don't make a zillion lines
 const smallPrimes = [
     2n, 3n, 5n, 7n, 11n, 13n, 17n, 19n, 23n, 29n, 31n, 37n, 41n, 43n, 47n,
     53n, 59n, 61n, 67n, 71n, 73n, 79n, 83n, 89n, 97n, 101n, 103n, 107n, 109n,

src/shared/ParamType.ts

@@ -16,6 +16,7 @@ import {ValidationStatus} from './ValidationStatus'
  */
 
 // prettier-ignore
+// biome-ignore format: otherwise the brace position is awkward
 export enum ParamType { /** table header to extract:
     | ParamType | Associated TypeScript type | Rendering in UI | Comments |
     | --------- | -------------------------- | --------------- | -------- | */

src/visualizers-workbench/Grid.ts

@@ -859,8 +859,8 @@ earlier ones that use the _same_ style.)
         if (this.pathType === PathType.Spiral) {
             // Turn at the numberToTurn at which increases every other turn
             if (iteration === this.numberToTurnAtForSpiral) {
-                this.numberToTurnAtForSpiral
-                    += this.incrementForNumberToTurnAt
+                this.numberToTurnAtForSpiral +=
+                    this.incrementForNumberToTurnAt
                 if (this.whetherIncrementShouldIncrement) {
                     this.incrementForNumberToTurnAt += 1
                     this.whetherIncrementShouldIncrement = false