lint: enforce max line length / max items per line / one item per line for imports using import-newlines eslint plugin

lint-configs/.eslintrc.js

@@ -13,6 +13,8 @@ const jsDocRecommendedRulesOff = Object.assign(
   ...Object.keys(jsDocPlugin.configs.recommended.rules).map((rule) => ({ [rule]: 'off' })),
 );
 
+const MAX_LINE_LENGTH = 120;
+
 module.exports = {
   // This is a root of the project, ESLint should not look through parent directories to find more config
   root: true,
@@ -77,7 +79,7 @@ module.exports = {
         project: './tsconfig.eslint.json',
       },
       // Allow ESLint to load rules from the TypeScript plugin
-      plugins: ['@typescript-eslint'],
+      plugins: ['@typescript-eslint', 'import-newlines'],
       extends: [
         // TypeScript plugin's recommended rules
         'plugin:@typescript-eslint/recommended',
@@ -108,6 +110,12 @@ module.exports = {
         // NOTE: Consider contributing this to the `airbnb-typescript` config.
         'import/named': 'off',
         'node/no-missing-import': 'off',
+        // Enforce how `import`s can be organized across multiple lines / maximum char lengths
+        'import-newlines/enforce': ['error', {
+          items: 4, // maximum number of import items per line, but all imports must fit within max-len
+          'max-len': MAX_LINE_LENGTH, // if imports can be kept to one line AND fit within max-len, great
+          forceSingleLine: false, // dont force single-line imports as long as the previous two rules are OK
+        }],
 
         // Prefer an interface declaration over a type alias because interfaces can be extended, implemented, and merged
         '@typescript-eslint/consistent-type-definitions': ['error', 'interface'],
@@ -169,7 +177,7 @@ module.exports = {
         // configurations in both JavaScript and TypeScript.
 
         // Increase the max line length to 120. The rest of this setting is copied from the AirBnB config.
-        'max-len': ['error', 120, 2, {
+        'max-len': ['error', MAX_LINE_LENGTH, 2, {
           ignoreUrls: true,
           ignoreComments: false,
           ignoreRegExpLiterals: true,

packages/logger/package.json

@@ -41,23 +41,24 @@
   },
   "devDependencies": {
     "@microsoft/api-extractor": "^7.36.4",
-    "@typescript-eslint/eslint-plugin": "^6.4.1",
-    "@typescript-eslint/parser": "^6.4.0",
     "@types/chai": "^4.3.5",
     "@types/mocha": "^10.0.1",
+    "@typescript-eslint/eslint-plugin": "^6.4.1",
+    "@typescript-eslint/parser": "^6.4.0",
     "chai": "^4.3.8",
     "eslint": "^8.47.0",
     "eslint-config-airbnb-base": "^15.0.0",
     "eslint-config-airbnb-typescript": "^17.1.0",
     "eslint-plugin-import": "^2.28.1",
+    "eslint-plugin-import-newlines": "^1.3.4",
     "eslint-plugin-jsdoc": "^46.5.0",
     "eslint-plugin-node": "^11.1.0",
     "mocha": "^10.2.0",
     "nyc": "^15.1.0",
     "shx": "^0.3.2",
-    "ts-node": "^8.2.0",
     "sinon": "^15.2.0",
     "source-map-support": "^0.5.21",
+    "ts-node": "^8.2.0",
     "typescript": "^4.1.0"
   }
 }

packages/oauth/package.json

@@ -57,6 +57,7 @@
     "eslint-config-airbnb-base": "^15",
     "eslint-config-airbnb-typescript": "^17",
     "eslint-plugin-import": "^2",
+    "eslint-plugin-import-newlines": "^1.3.4",
     "eslint-plugin-jsdoc": "^48",
     "eslint-plugin-node": "^11",
     "mocha": "^10",

packages/rtm-api/package.json

@@ -61,6 +61,7 @@
     "eslint-config-airbnb-base": "^15.0.0",
     "eslint-config-airbnb-typescript": "^17.1.0",
     "eslint-plugin-import": "^2.28.1",
+    "eslint-plugin-import-newlines": "^1.3.4",
     "eslint-plugin-jsdoc": "^46.5.0",
     "eslint-plugin-node": "^11.1.0",
     "shx": "^0.3.2",

packages/socket-mode/package.json

@@ -56,15 +56,16 @@
     "ws": "^7.5.3"
   },
   "devDependencies": {
-    "@typescript-eslint/eslint-plugin": "^6.4.1",
-    "@typescript-eslint/parser": "^6.4.0",
     "@types/chai": "^4.3.5",
     "@types/mocha": "^10.0.1",
+    "@typescript-eslint/eslint-plugin": "^6.4.1",
+    "@typescript-eslint/parser": "^6.4.0",
     "chai": "^4.3.8",
     "eslint": "^8.47.0",
     "eslint-config-airbnb-base": "^15.0.0",
     "eslint-config-airbnb-typescript": "^17.1.0",
     "eslint-plugin-import": "^2.28.1",
+    "eslint-plugin-import-newlines": "^1.3.4",
     "eslint-plugin-jsdoc": "^46.5.0",
     "eslint-plugin-node": "^11.1.0",
     "mocha": "^10.2.0",

packages/types/package.json

@@ -43,6 +43,7 @@
     "eslint-config-airbnb-base": "^15.0.0",
     "eslint-config-airbnb-typescript": "^17.1.0",
     "eslint-plugin-import": "^2.28.1",
+    "eslint-plugin-import-newlines": "^1.3.4",
     "eslint-plugin-jsdoc": "^46.5.0",
     "eslint-plugin-node": "^11.1.0",
     "shx": "^0.3.2",

packages/types/src/block-kit/block-elements.ts

@@ -1,6 +1,13 @@
 // This file contains objects documented here: https://api.slack.com/reference/block-kit/block-elements
 
-import { Actionable, Confirmable, Dispatchable, Focusable, Placeholdable, RichTextStyleable } from './extensions';
+import {
+  Actionable,
+  Confirmable,
+  Dispatchable,
+  Focusable,
+  Placeholdable,
+  RichTextStyleable,
+} from './extensions';
 import { Option, PlainTextElement, PlainTextOption } from './composition-objects';
 import { RichTextBlock } from './blocks';
 

packages/types/src/block-kit/blocks.ts

@@ -2,7 +2,29 @@
 
 import { PlainTextElement, MrkdwnElement } from './composition-objects';
 import { Actionable } from './extensions';
-import { Button, Checkboxes, Datepicker, DateTimepicker, EmailInput, FileInput, ImageElement, MultiSelect, NumberInput, Overflow, PlainTextInput, RadioButtons, Select, Timepicker, URLInput, WorkflowButton, RichTextSection, RichTextList, RichTextQuote, RichTextPreformatted, RichTextInput } from './block-elements';
+import {
+  Button,
+  Checkboxes,
+  Datepicker,
+  DateTimepicker,
+  EmailInput,
+  FileInput,
+  ImageElement,
+  MultiSelect,
+  NumberInput,
+  Overflow,
+  PlainTextInput,
+  RadioButtons,
+  Select,
+  Timepicker,
+  URLInput,
+  WorkflowButton,
+  RichTextSection,
+  RichTextList,
+  RichTextQuote,
+  RichTextPreformatted,
+  RichTextInput,
+} from './block-elements';
 
 export interface Block {
   type: string;

packages/web-api/package.json

@@ -72,6 +72,7 @@
     "eslint-config-airbnb-base": "^15",
     "eslint-config-airbnb-typescript": "^17",
     "eslint-plugin-import": "^2",
+    "eslint-plugin-import-newlines": "^1.3.4",
     "eslint-plugin-jsdoc": "^48",
     "eslint-plugin-node": "^11",
     "mocha": "^10",

packages/web-api/src/WebClient.ts

@@ -22,15 +22,28 @@ import {
 } from './types/response';
 import { CursorPaginationEnabled } from './types/request/common';
 import { Methods } from './methods';
-import type { FilesUploadV2Arguments, FileUploadV2Job, FilesGetUploadURLExternalArguments, FilesCompleteUploadExternalArguments } from './types/request/files';
+import type {
+  FilesUploadV2Arguments,
+  FileUploadV2Job,
+  FilesGetUploadURLExternalArguments,
+  FilesCompleteUploadExternalArguments,
+} from './types/request/files';
 import { getUserAgent } from './instrument';
 import {
-  requestErrorWithOriginal, httpErrorFromResponse, platformErrorFromResult, rateLimitedErrorWithDelay,
+  requestErrorWithOriginal,
+  httpErrorFromResponse,
+  platformErrorFromResult,
+  rateLimitedErrorWithDelay,
 } from './errors';
 import { LogLevel, Logger, getLogger } from './logger';
 import { RetryOptions, tenRetriesInAboutThirtyMinutes } from './retry-policies';
 import delay from './helpers';
-import { warnIfNotUsingFilesUploadV2, getFileUploadJob, getMultipleFileUploadJobs, getAllFileUploadsToComplete } from './file-upload';
+import {
+  warnIfNotUsingFilesUploadV2,
+  getFileUploadJob,
+  getMultipleFileUploadJobs,
+  getAllFileUploadsToComplete,
+} from './file-upload';
 
 /*
  * Helpers

packages/web-api/src/file-upload.ts

@@ -2,7 +2,14 @@ import { readFileSync } from 'fs';
 import { Readable } from 'stream';
 import { Logger } from '@slack/logger';
 import { errorWithCode, ErrorCode } from './errors';
-import { FilesCompleteUploadExternalArguments, FilesUploadV2Arguments, FileUploadBinaryContents, FileUploadStringContents, FileUploadV2, FileUploadV2Job } from './types/request/files';
+import {
+  FilesCompleteUploadExternalArguments,
+  FilesUploadV2Arguments,
+  FileUploadBinaryContents,
+  FileUploadStringContents,
+  FileUploadV2,
+  FileUploadV2Job,
+} from './types/request/files';
 
 export async function getFileUploadJob(
   options: FilesUploadV2Arguments | FileUploadV2,