Add ESLint recommended rules

.eslintrc.json

@@ -1,14 +1,27 @@
 {
 	"root": true,
 	"parser": "@typescript-eslint/parser",
-	"extends": ["prettier"],
+	"extends": [
+		"eslint:recommended",
+		"plugin:@typescript-eslint/recommended",
+		"prettier"
+	],
 	"parserOptions": {
 		"ecmaVersion": 6,
 		"sourceType": "module"
 	},
 	"plugins": ["@typescript-eslint"],
 	"rules": {
+		"@typescript-eslint/consistent-type-assertions": [
+			"error",
+			{
+				"assertionStyle": "as"
+			}
+		],
 		"@typescript-eslint/naming-convention": "warn",
+		"@typescript-eslint/no-explicit-any": "off",
+		"@typescript-eslint/no-inferrable-types": "off",
+		"@typescript-eslint/no-non-null-assertion": "off",
 		"@typescript-eslint/no-unused-vars": [
 			"warn",
 			{
@@ -25,6 +38,7 @@
 				"null": "never"
 			}
 		],
+		"no-constant-condition": ["error", { "checkLoops": false }],
 		"no-throw-literal": "warn",
 		"semi": "off"
 	},

src/actions/GenerateSnippet/Substituter.ts

@@ -68,11 +68,11 @@ export default class Substituter {
  * @returns A string of random digits of length {@param length}
  */
 function makeid(length: number) {
-  var result = "";
-  var characters =
+  let result = "";
+  const characters =
     "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
-  var charactersLength = characters.length;
-  for (var i = 0; i < length; i++) {
+  const charactersLength = characters.length;
+  for (let i = 0; i < length; i++) {
     result += characters.charAt(Math.floor(Math.random() * charactersLength));
   }
   return result;

src/core/Debug.ts

@@ -40,7 +40,9 @@ export default class Debug {
     }
   }
 
-  init() {}
+  init() {
+    // do nothing
+  }
 
   log(...args: any[]) {
     if (this.active) {

src/core/FontMeasurements.ts

@@ -27,7 +27,7 @@ export default class FontMeasurements {
   async calculate() {
     const fontFamily = getFontFamily();
     let widthRatio, heightRatio;
-    let fontRatiosCache = this.graph.extensionContext.globalState.get<{
+    const fontRatiosCache = this.graph.extensionContext.globalState.get<{
       widthRatio: number;
       heightRatio: number;
       fontFamily: string;

src/core/HatTokenMap.ts

@@ -55,13 +55,14 @@ export default class HatTokenMap {
   }
 
   static splitKey(key: string) {
-    let [hatStyle, character] = key.split(".");
-    if (character.length === 0) {
+    const [hatStyle, character] = key.split(".");
+
+    return {
+      hatStyle: hatStyle as HatStyleName,
       // If the character is `.` then it will appear as a zero length string
       // due to the way the split on `.` works
-      character = ".";
-    }
-    return { hatStyle: hatStyle as HatStyleName, character };
+      character: character.length === 0 ? "." : character,
+    };
   }
 
   private async getActiveMap() {

src/core/Snippets.ts

@@ -233,7 +233,7 @@ export class Snippets {
     ];
 
     entries.forEach(([key, value]) => {
-      if (this.mergedSnippets.hasOwnProperty(key)) {
+      if (Object.prototype.hasOwnProperty.call(this.mergedSnippets, key)) {
         const { definitions, ...rest } = value;
         const mergedSnippet = this.mergedSnippets[key];
 

src/core/commandVersionUpgrades/upgradeV1ToV2/upgradeV1ToV2.ts

@@ -131,10 +131,12 @@ function upgradePrimitiveTarget(
         if (modifier?.type === "subpiece") {
           break;
         }
+      // fallthrough
       case "line":
         if (mark?.type === "lineNumber") {
           break;
         }
+      // fallthrough
       default:
         modifiers.push({
           type: "containingScope",
@@ -172,7 +174,7 @@ function upgradeTarget(
               | PartialRangeTargetDescriptor
         ),
       };
-    case "range":
+    case "range": {
       const { type, rangeType, start, end, excludeStart, excludeEnd } = target;
       return {
         type,
@@ -182,6 +184,7 @@ function upgradeTarget(
         excludeAnchor: excludeStart ?? false,
         excludeActive: excludeEnd ?? false,
       };
+    }
     case "primitive":
       return upgradePrimitiveTarget(target, action);
   }

src/core/inferFullTargets.ts

@@ -214,7 +214,7 @@ function getPreviousTargetAttribute<T>(
         }
         break;
       }
-      case "list":
+      case "list": {
         const attributeValue = getPreviousTargetAttribute(
           target.elements,
           getAttribute
@@ -223,6 +223,7 @@ function getPreviousTargetAttribute<T>(
           return attributeValue;
         }
         break;
+      }
     }
   }
   return undefined;

src/core/updateSelections/getOffsetsForEmptyRangeInsert.ts

@@ -61,7 +61,7 @@ export default function getOffsetsForEmptyRangeInsert(
       case "open":
         return { start, end };
 
-      case "regex":
+      case "regex": {
         const matches = text.match(leftAnchored(expansionBehavior.regex));
 
         return matches == null
@@ -73,6 +73,7 @@ export default function getOffsetsForEmptyRangeInsert(
               start,
               end: start + matches[0].length,
             };
+      }
     }
   } else {
     // In this case the range moves to the right so we care about the start of the range
@@ -88,7 +89,7 @@ export default function getOffsetsForEmptyRangeInsert(
       case "open":
         return { start, end };
 
-      case "regex":
+      case "regex": {
         const index = text.search(rightAnchored(expansionBehavior.regex));
 
         return index === -1
@@ -100,6 +101,7 @@ export default function getOffsetsForEmptyRangeInsert(
               start: start + index,
               end,
             };
+      }
     }
   }
 }

src/core/updateSelections/getOffsetsForNonEmptyRangeInsert.ts

@@ -76,7 +76,7 @@ export default function getOffsetsForNonEmptyRangeInsert(
           end: newRangeEnd,
         };
 
-      case "regex":
+      case "regex": {
         let text = insertedText + originalRangeText;
         const regex = rightAnchored(expansionBehavior.regex);
         let index = text.search(regex);
@@ -95,6 +95,7 @@ export default function getOffsetsForNonEmptyRangeInsert(
               start: rangeStart + index,
               end: newRangeEnd,
             };
+      }
     }
   } else {
     const expansionBehavior = rangeInfo.expansionBehavior.end;
@@ -113,7 +114,7 @@ export default function getOffsetsForNonEmptyRangeInsert(
           end: rangeEnd + displacement,
         };
 
-      case "regex":
+      case "regex": {
         let text = originalRangeText + insertedText;
         const regex = leftAnchored(expansionBehavior.regex);
         let matches = text.match(regex);
@@ -134,6 +135,7 @@ export default function getOffsetsForNonEmptyRangeInsert(
               start: newRangeStart,
               end: rangeStart + matchLength,
             };
+      }
     }
   }
 }

src/extension.ts

@@ -95,4 +95,6 @@ export async function activate(context: vscode.ExtensionContext) {
 }
 
 // this method is called when your extension is deactivated
-export function deactivate() {}
+export function deactivate() {
+  // do nothing
+}

src/processTargets/marks/CursorStage.ts

@@ -1,13 +1,15 @@
 import { Target } from "../../typings/target.types";
-import { CursorMark } from "../../typings/targetDescriptor.types";
+import type { CursorMark } from "../../typings/targetDescriptor.types";
 import { ProcessedTargetsContext } from "../../typings/Types";
 import { isReversed } from "../../util/selectionUtils";
 import { MarkStage } from "../PipelineStages.types";
 import WeakTarget from "../targets/WeakTarget";
 import TokenTarget from "../targets/TokenTarget";
 
 export default class CursorStage implements MarkStage {
-  constructor(_modifier: CursorMark) {}
+  constructor(_modifier: CursorMark) {
+    // takes mark for consistency and does nothing
+  }
 
   run(context: ProcessedTargetsContext): Target[] {
     return context.currentSelections.map((selection) => {

src/processTargets/marks/LineNumberStage.ts

@@ -32,7 +32,7 @@ const getLine = (editor: TextEditor, linePosition: LineNumberPosition) => {
       return linePosition.lineNumber;
     case "relative":
       return editor.selection.active.line + linePosition.lineNumber;
-    case "modulo100":
+    case "modulo100": {
       const stepSize = 100;
       const startLine = editor.visibleRanges[0].start.line;
       const endLine =
@@ -64,5 +64,6 @@ const getLine = (editor: TextEditor, linePosition: LineNumberPosition) => {
         return invisibleLines[0];
       }
       throw new Error("Line is not in viewport");
+    }
   }
 };

src/processTargets/modifiers/ItemStage/ItemStage.ts

@@ -24,9 +24,11 @@ export default class ItemStage implements ModifierStage {
     // First try the language specific implementation of item
     try {
       return new ContainingSyntaxScopeStage(
-        <SimpleContainingScopeModifier>this.modifier
+        this.modifier as SimpleContainingScopeModifier
       ).run(context, target);
-    } catch (_error) {}
+    } catch (_error) {
+      // do nothing
+    }
 
     // Then try the textual implementation
     if (this.modifier.type === "everyScope") {
@@ -96,7 +98,7 @@ export default class ItemStage implements ModifierStage {
       ", "
     );
     return new ScopeTypeTarget({
-      scopeTypeType: <SimpleScopeTypeType>this.modifier.scopeType.type,
+      scopeTypeType: this.modifier.scopeType.type as SimpleScopeTypeType,
       editor: target.editor,
       isReversed: target.isReversed,
       contentRange: itemInfo.contentRange,

src/processTargets/modifiers/scopeTypeStages/RegexStage.ts

@@ -129,7 +129,7 @@ export class NonWhitespaceSequenceStage extends RegexStage {
 
 // taken from https://regexr.com/3e6m0
 const URL_REGEX =
-  /(http(s)?:\/\/.)?(www\.)?[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%_\+.~#?&//=]*)/g;
+  /(http(s)?:\/\/.)?(www\.)?[-a-zA-Z0-9@:%._+~#=]{2,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%_+.~#?&//=]*)/g;
 
 export type UrlModifier = (ContainingScopeModifier | EveryScopeModifier) & {
   scopeType: { type: "url" };

src/processTargets/modifiers/scopeTypeStages/TokenStage.ts

@@ -143,7 +143,7 @@ function getRelevantTokens(editor: TextEditor, range: Range) {
   const startLine = range.start.line;
   const endLine = range.end.line;
 
-  let tokens = getTokensInRange(
+  const tokens = getTokensInRange(
     editor,
     editor.document.lineAt(startLine).range
   );

src/processTargets/modifiers/surroundingPair/findDelimiterPairContainingSelection.ts

@@ -66,22 +66,22 @@ export function findDelimiterPairContainingSelection(
 
   while (true) {
     // Scan right until we find an acceptable unmatched closing delimiter
-    let rightNext = rightDelimiterGenerator.next();
+    const rightNext = rightDelimiterGenerator.next();
     if (rightNext.done) {
       return null;
     }
-    let rightDelimiterOccurrence = rightNext.value!;
+    const rightDelimiterOccurrence = rightNext.value!;
 
     // Then scan left until we find an unmatched delimiter matching the
     // delimiter we found in our rightward pass.
     acceptableLeftDelimiters = [
       rightDelimiterOccurrence.delimiterInfo.delimiter,
     ];
-    let leftNext = leftDelimiterGenerator.next();
+    const leftNext = leftDelimiterGenerator.next();
     if (leftNext.done) {
       return null;
     }
-    let leftDelimiterOccurrence = leftNext.value!;
+    const leftDelimiterOccurrence = leftNext.value!;
 
     // If left delimiter is left of our selection, we return it.  Otherwise
     // loop back and continue scanning outwards.

src/processTargets/modifiers/surroundingPair/findSurroundingPairParseTreeBased.ts

@@ -212,7 +212,7 @@ function findSurroundingPairContainedInNode(
           // first child of its parent, and right delimiter otherwise.  This
           // approach might not always work, but seems to work in the
           // languages we've tried.
-          let side =
+          const side =
             delimiterInfo.side === "unknown" && scopeType.forceDirection == null
               ? inferDelimiterSide(delimiterNode)
               : delimiterInfo.side;

src/processTargets/modifiers/surroundingPair/findSurroundingPairTextBased.ts

@@ -267,7 +267,7 @@ function getDelimiterPairOffsets(
 
           const rawDelimiterInfo = delimiterTextToDelimiterInfoMap[matchText];
 
-          let side =
+          const side =
             rawDelimiterInfo.side === "unknown" && forceDirection == null
               ? inferDelimiterSide(
                   text,

src/processTargets/modifiers/surroundingPair/generateUnmatchedDelimiters.ts

@@ -91,7 +91,7 @@ export function* generateUnmatchedDelimiters(
    * right delimiters of the given type we've seen. If this number drops to
    * -1 for any delimiter, we yield it.
    */
-  let delimiterBalances: Partial<Record<SimpleSurroundingPairName, number>> =
+  const delimiterBalances: Partial<Record<SimpleSurroundingPairName, number>> =
     {};
 
   /**

src/processTargets/targets/ScopeTypeTarget.ts

@@ -103,7 +103,7 @@ export default class ScopeTypeTarget extends BaseTarget {
     includeEnd: boolean
   ): Target {
     if (isSameType(this, endTarget)) {
-      const scopeTarget = <ScopeTypeTarget>endTarget;
+      const scopeTarget = endTarget;
       if (this.scopeTypeType_ === scopeTarget.scopeTypeType_) {
         const contentRemovalRange =
           this.removalRange_ != null || scopeTarget.removalRange_ != null

src/scripts/hatAdjustments/add.ts

@@ -24,7 +24,7 @@ function processProperty(
   hatAdjustmentsList: HatAdjustments[],
   propertyName: keyof HatAdjustments
 ) {
-  let value = sum(
+  const value = sum(
     hatAdjustmentsList.map((adjustment) => adjustment[propertyName] ?? 0)
   );
 

src/test/suite/breakpoints.test.ts

@@ -45,7 +45,7 @@ async function breakpointHarpAdd() {
   const breakpoints = vscode.debug.breakpoints;
   assert.deepStrictEqual(breakpoints.length, 1);
   assert.ok(breakpoints[0] instanceof vscode.SourceBreakpoint);
-  const breakpoint = <vscode.SourceBreakpoint>breakpoints[0];
+  const breakpoint = breakpoints[0];
   assert.ok(breakpoint.location.range.isEqual(new vscode.Range(0, 0, 0, 0)));
 }
 
@@ -74,7 +74,7 @@ async function breakpointTokenHarpAdd() {
   const breakpoints = vscode.debug.breakpoints;
   assert.deepStrictEqual(breakpoints.length, 1);
   assert.ok(breakpoints[0] instanceof vscode.SourceBreakpoint);
-  const breakpoint = <vscode.SourceBreakpoint>breakpoints[0];
+  const breakpoint = breakpoints[0];
   assert.ok(breakpoint.location.range.isEqual(new vscode.Range(0, 2, 0, 7)));
 }
 
@@ -146,7 +146,7 @@ async function breakpointTokenHarpRemove() {
   const breakpoints = vscode.debug.breakpoints;
   assert.deepStrictEqual(breakpoints.length, 1);
   assert.ok(breakpoints[0] instanceof vscode.SourceBreakpoint);
-  const breakpoint = <vscode.SourceBreakpoint>breakpoints[0];
+  const breakpoint = breakpoints[0];
   assert.ok(breakpoint.location.range.isEqual(new vscode.Range(0, 0, 0, 0)));
 }