dprint the codebase

.dprint.jsonc

@@ -0,0 +1,55 @@
+{
+    "indentWidth": 4,
+    "lineWidth": 1000,
+    "newLineKind": "auto",
+    "useTabs": false,
+    "typescript": {
+        "semiColons": "always",
+        "quoteStyle": "preferDouble",
+        "quoteProps": "consistent",
+        "useBraces": "whenNotSingleLine",
+        "bracePosition": "sameLineUnlessHanging",
+        "singleBodyPosition": "sameLine",
+        "nextControlFlowPosition": "nextLine", // Stroustrup style braces.
+        "trailingCommas": "onlyMultiLine",
+        "preferHanging": false,
+        "operatorPosition": "maintain",
+
+        "arrowFunction.useParentheses": "preferNone",
+        "conditionalExpression.linePerExpression": false, // Keep our "match/case"-ish conditionals.
+        "functionExpression.spaceAfterFunctionKeyword": true,
+        "importDeclaration.forceMultiLine": true,
+        "constructorType.spaceAfterNewKeyword": true,
+        "constructSignature.spaceAfterNewKeyword": true,
+
+        // Let eslint-plugin-simple-import-sort handle this.
+        "module.sortImportDeclarations": "maintain",
+        "module.sortExportDeclarations": "maintain",
+        "exportDeclaration.sortNamedExports": "maintain",
+        "importDeclaration.sortNamedImports": "maintain"
+    },
+    "prettier": {
+        "associations": [
+            "**/*.{yaml,yml}"
+        ],
+        "yml.tabWidth": 2,
+        "yaml.tabWidth": 2,
+        "yml.singleQuote": true,
+        "yaml.singleQuote": true
+    },
+    "excludes": [
+        "**/node_modules",
+        "**/*-lock.json",
+        "coverage/**",
+        "lib/**",
+        "built/**",
+        "tests/**",
+        "internal/**",
+        "**/*.generated.*",
+        "scripts/*.d.*"
+    ],
+    "plugins": [
+        "https://plugins.dprint.dev/typescript-0.86.1.wasm",
+        "https://plugins.dprint.dev/prettier-0.27.0.json@3557a62b4507c55a47d8cde0683195b14d13c41dda66d0f0b0e111aed107e2fe"
+    ]
+}

.eslintplugin.js

@@ -3,10 +3,10 @@ const path = require("path");
 
 const rulesDir = path.join(__dirname, "scripts", "eslint", "rules");
 const ext = ".cjs";
-const ruleFiles = fs.readdirSync(rulesDir).filter((p) => p.endsWith(ext));
+const ruleFiles = fs.readdirSync(rulesDir).filter(p => p.endsWith(ext));
 
 module.exports = {
-    rules: Object.fromEntries(ruleFiles.map((p) => {
+    rules: Object.fromEntries(ruleFiles.map(p => {
         return [p.slice(0, -ext.length), require(path.join(rulesDir, p))];
     })),
-}
+};

.eslintrc.json

@@ -128,33 +128,7 @@
 
         // eslint-plugin-simple-import-sort
         "simple-import-sort/imports": "error",
-        "simple-import-sort/exports": "error",
-
-        // Formatting rules; remove once a formatter enforces these.
-        "curly": ["error", "multi-line"],
-        "linebreak-style": ["error", "windows"],
-        "max-statements-per-line": ["error", { "max": 1 }],
-        "new-parens": "error",
-        "no-trailing-spaces": "error",
-        "quote-props": ["error", "consistent-as-needed"],
-        "space-in-parens": "error",
-        "@typescript-eslint/brace-style": ["error", "stroustrup", { "allowSingleLine": true }],
-        "@typescript-eslint/no-extra-semi": "error",
-        "@typescript-eslint/quotes": ["error", "double", { "avoidEscape": true, "allowTemplateLiterals": true }],
-        "@typescript-eslint/semi": "error",
-        "@typescript-eslint/space-before-function-paren": [
-            "error",
-            {
-                "asyncArrow": "always",
-                "anonymous": "always",
-                "named": "never"
-            }
-        ],
-        "local/object-literal-surrounding-space": "error",
-        "local/no-type-assertion-whitespace": "error",
-        "local/type-operator-spacing": "error",
-        "local/no-double-space": "error",
-        "local/simple-indent": "error"
+        "simple-import-sort/exports": "error"
     },
     "overrides": [
         // By default, the ESLint CLI only looks at .js files. But, it will also look at

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -1,13 +1,13 @@
-name: "Bug report"
-description: "Create a report to help us improve TypeScript"
+name: 'Bug report'
+description: 'Create a report to help us improve TypeScript'
 body:
   - type: markdown
     attributes:
       value: Please fill in each section completely. Thank you!
   - type: textarea
     id: search_terms
     attributes:
-      label: "🔎 Search Terms"
+      label: '🔎 Search Terms'
       description: |
         What search terms did you use when trying to find an existing bug report?
 
@@ -22,7 +22,7 @@ body:
   - type: textarea
     id: version_info
     attributes:
-      label: "🕗 Version & Regression Information"
+      label: '🕗 Version & Regression Information'
       description: |
         When did you start seeing this bug occur?
 
@@ -33,7 +33,7 @@ body:
         If possible, please try testing the nightly version of TS to see if it's already been fixed. For npm: `typescript@next`
 
         This is also the 'Nightly' version in the playground: http://www.typescriptlang.org/play/?ts=Nightly
-  
+
 
         Note: The TypeScript Playground can be used to try older versions of TypeScript.
 
@@ -56,7 +56,7 @@ body:
 
 
         As a last resort, you can link to a repo, but these will be slower for us to investigate.
-      placeholder: "Playground link with relevant code: https://www.typescriptlang.org/play?#code/PTAEFkE9QYwewCYFNQHM5IM6gBZIE5JA"
+      placeholder: 'Playground link with relevant code: https://www.typescriptlang.org/play?#code/PTAEFkE9QYwewCYFNQHM5IM6gBZIE5JA'
     validations:
       required: false
   - type: textarea
@@ -87,7 +87,7 @@ body:
     id: actual_behavior
     attributes:
       label: 🙁 Actual behavior
-      description: "What happened, and why it was wrong."
+      description: 'What happened, and why it was wrong.'
     validations:
       required: true
   - type: textarea

.github/ISSUE_TEMPLATE/config.yml

@@ -1,19 +1,15 @@
---- 
+---
 blank_issues_enabled: false
-contact_links: 
-  - 
-    about: "Please ask and answer usage questions on Stack Overflow."
+contact_links:
+  - about: 'Please ask and answer usage questions on Stack Overflow.'
     name: Question
-    url: "https://stackoverflow.com/questions/tagged/typescript"
-  - 
-    about: "Alternatively, you can use the TypeScript Community Discord."
+    url: 'https://stackoverflow.com/questions/tagged/typescript'
+  - about: 'Alternatively, you can use the TypeScript Community Discord.'
     name: Chat
-    url: "https://discord.gg/typescript"
-  - 
-    about: "Please check the FAQ before filing new issues"
-    name: "TypeScript FAQ"
-    url: "https://github.com/microsoft/TypeScript/wiki/FAQ"
-  - 
-    about: "Please raise issues about the site on its own repo."
+    url: 'https://discord.gg/typescript'
+  - about: 'Please check the FAQ before filing new issues'
+    name: 'TypeScript FAQ'
+    url: 'https://github.com/microsoft/TypeScript/wiki/FAQ'
+  - about: 'Please raise issues about the site on its own repo.'
     name: Website
-    url: "https://github.com/microsoft/TypeScript-Website/issues/new"
+    url: 'https://github.com/microsoft/TypeScript-Website/issues/new'

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -1,19 +1,19 @@
-name: "Feature request"
-description: "Suggest an idea"
+name: 'Feature request'
+description: 'Suggest an idea'
 body:
   - type: markdown
     attributes:
-      value: "Please fill in each section completely. Thank you!"
+      value: 'Please fill in each section completely. Thank you!'
   - type: textarea
     id: search_terms
     attributes:
-      label: "🔍 Search Terms"
+      label: '🔍 Search Terms'
       description: |
-          💡 Did you know? TypeScript has over 2,000 open suggestions!
+        💡 Did you know? TypeScript has over 2,000 open suggestions!
 
-          🔎 Please search thoroughly before logging new feature requests as most common ideas already have a proposal in progress.
+        🔎 Please search thoroughly before logging new feature requests as most common ideas already have a proposal in progress.
 
-          The "Common Feature Requests" section of the FAQ lists many popular requests: https://github.com/Microsoft/TypeScript/wiki/FAQ#common-feature-requests
+        The "Common Feature Requests" section of the FAQ lists many popular requests: https://github.com/Microsoft/TypeScript/wiki/FAQ#common-feature-requests
       placeholder: |
         List of keywords you searched for before creating this issue.
         Write them down here so that others can find this suggestion more easily and help provide feedback.
@@ -24,44 +24,44 @@ body:
   - type: checkboxes
     id: viability_checklist
     attributes:
-      label: "✅ Viability Checklist"
+      label: '✅ Viability Checklist'
       description: |
         Suggestions that don't meet all these criteria are very, very unlikely to be accepted.
         We always recommend reviewing the TypeScript design goals before investing time writing
         a proposal for ideas outside the scope of the project.
 
         My suggestion meets the following guidelines.
       options:
-      - label: This wouldn't be a breaking change in existing TypeScript/JavaScript code
-        required: true
-      - label: This wouldn't change the runtime behavior of existing JavaScript code
-        required: true
-      - label: This could be implemented without emitting different JS based on the types of the expressions
-        required: true
-      - label: This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, new syntax sugar for JS, etc.)
-        required: true
-      - label: "This feature would agree with the rest of our Design Goals: https://github.com/Microsoft/TypeScript/wiki/TypeScript-Design-Goals"
-        required: true
+        - label: This wouldn't be a breaking change in existing TypeScript/JavaScript code
+          required: true
+        - label: This wouldn't change the runtime behavior of existing JavaScript code
+          required: true
+        - label: This could be implemented without emitting different JS based on the types of the expressions
+          required: true
+        - label: This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, new syntax sugar for JS, etc.)
+          required: true
+        - label: 'This feature would agree with the rest of our Design Goals: https://github.com/Microsoft/TypeScript/wiki/TypeScript-Design-Goals'
+          required: true
   - type: textarea
     id: suggestion_summary
     attributes:
-      label: "⭐ Suggestion"
+      label: '⭐ Suggestion'
       description: "A summary of what you'd like to see added or changed"
     validations:
       required: true
   - type: textarea
     id: motivating_example
     attributes:
-      label: "📃 Motivating Example"
+      label: '📃 Motivating Example'
       description: |
-          If you were announcing this feature in a blog post, what's a short
-          explanation that shows a developer why this feature improves the language?
+        If you were announcing this feature in a blog post, what's a short
+        explanation that shows a developer why this feature improves the language?
     validations:
       required: true
   - type: textarea
     id: use_cases
     attributes:
-      label: "💻 Use Cases"
+      label: '💻 Use Cases'
       value: |
         1. What do you want to use this for?
         2. What shortcomings exist with current approaches?

.github/ISSUE_TEMPLATE/lib_change.yml

@@ -1,5 +1,5 @@
-name: "Library change"
-description: "Fix or improve issues with built-in type definitions like `lib.dom.d.ts`, `lib.es6.d.ts`, etc."
+name: 'Library change'
+description: 'Fix or improve issues with built-in type definitions like `lib.dom.d.ts`, `lib.es6.d.ts`, etc.'
 body:
   - type: markdown
     attributes:
@@ -18,45 +18,45 @@ body:
   - type: markdown
     attributes:
       value: |
-          If you're missing common new methods like `Array.includes`, you may have a misconfigured project.
-          Try setting `lib: "es2020"` and checking whether the type you want is present.
-          You can diagnose further by running `tsc` with `--listFilesOnly` or `--showConfig`.
+        If you're missing common new methods like `Array.includes`, you may have a misconfigured project.
+        Try setting `lib: "es2020"` and checking whether the type you want is present.
+        You can diagnose further by running `tsc` with `--listFilesOnly` or `--showConfig`.
 
-          Conversely, if you are seeing built-in methods you expect to *not* see, check your 'lib' setting or review your dependencies for lib/reference directives that might be polluting
-          your global scope. This is common when using the 'node' type library. See https://github.com/microsoft/TypeScript/issues/40184
+        Conversely, if you are seeing built-in methods you expect to *not* see, check your 'lib' setting or review your dependencies for lib/reference directives that might be polluting
+        your global scope. This is common when using the 'node' type library. See https://github.com/microsoft/TypeScript/issues/40184
   - type: input
     id: compilation_target
     attributes:
-      label: "⚙ Compilation target"
+      label: '⚙ Compilation target'
       description: "What's your compilation target (e.g.: `ES2015`)?"
     validations:
       required: true
   - type: input
     id: current_lib
     attributes:
-      label: "⚙ Library"
+      label: '⚙ Library'
       description: "What's the current library you're using?"
     validations:
       required: true
   - type: textarea
     id: incorrect_definition
     attributes:
-      label: "Missing / Incorrect Definition"
-      description: "What property, method, function, etc. is missing or incorrect?"
+      label: 'Missing / Incorrect Definition'
+      description: 'What property, method, function, etc. is missing or incorrect?'
     validations:
       required: true
   - type: textarea
     id: sample_code
     attributes:
-      label: "Sample Code"
+      label: 'Sample Code'
       description: "What's some code using this that should work, but doesn't?"
       render: TypeScript
     validations:
       required: true
   - type: textarea
     id: documentation_link
     attributes:
-      label: "Documentation Link"
+      label: 'Documentation Link'
       description: |
         Link to relevant documentation (e.g. MDN, W3C, ECMAScript Spec) to consult for this property.
         Note that lib.dom.d.ts intentionally does not include browser-specific extensions or early experimental features.

.github/ISSUE_TEMPLATE/module_resolution.yml

@@ -1,6 +1,6 @@
 name: Module resolution
 description: Report a problem with module resolution
-title: "Module resolution:"
+title: 'Module resolution:'
 labels: []
 body:
   - type: markdown
@@ -64,7 +64,7 @@ body:
     attributes:
       label: Run `tsc --showConfig` and paste its output here
       description: Repros that depend on running within external tools (yarn, pnpm, esbuild, etc.) are not TypeScript defects and will not be investigated.
-      placeholder: "> tsc --showConfig"
+      placeholder: '> tsc --showConfig'
     validations:
       required: true
 
@@ -73,30 +73,30 @@ body:
     attributes:
       label: Run `tsc --traceResolution` and paste its output here
       description: Run `tsc --traceResolution` and paste the output here.
-      placeholder: "> tsc --traceResolution"
+      placeholder: '> tsc --traceResolution'
     validations:
       required: true
 
   - type: textarea
     id: import-package-json
     attributes:
       label: Paste the `package.json` of the *importing* module, if it exists
-      placeholder: "my_project/package.json"
+      placeholder: 'my_project/package.json'
     validations:
       required: true
 
   - type: textarea
     id: export-package-json
     attributes:
       label: Paste the `package.json` of the *target* module, if it exists
-      placeholder: "node_modules/somepkg/package.json"
+      placeholder: 'node_modules/somepkg/package.json'
     validations:
       required: true
 
   - type: textarea
     id: comments
     attributes:
       label: Any other comments can go here
-      placeholder: "Have a nice day!"
+      placeholder: 'Have a nice day!'
     validations:
       required: true