refactor: drop first, last

Author: 9romise

src/html/intermediate-tokenizer.ts

@@ -4,7 +4,6 @@
  * See LICENSE file in root directory for full license.
  */
 import assert from "assert"
-import last from "lodash/last"
 import type {
     ErrorCode,
     HasLocation,
@@ -175,7 +174,7 @@ export class IntermediateTokenizer {
             // VExpressionEnd was not found.
             // Concatenate the deferred tokens to the committed token.
             const start = this.expressionStartToken
-            const end = last(this.expressionTokens) || start
+            const end = this.expressionTokens.at(-1) || start
             const value = this.expressionTokens.reduce(concat, start.value)
             this.expressionStartToken = null
             this.expressionTokens = []
@@ -240,7 +239,7 @@ export class IntermediateTokenizer {
         if (this.expressionStartToken != null) {
             // Defer this token until a VExpressionEnd token or a non-text token appear.
             const lastToken =
-                last(this.expressionTokens) || this.expressionStartToken
+                this.expressionTokens.at(-1) || this.expressionStartToken
             if (lastToken.range[1] === token.range[0]) {
                 this.expressionTokens.push(token)
                 return null
@@ -552,7 +551,7 @@ export class IntermediateTokenizer {
         }
 
         const start = this.expressionStartToken
-        const end = last(this.expressionTokens) || start
+        const end = this.expressionTokens.at(-1) || start
 
         // If it's '{{}}', it's handled as a text.
         if (token.range[0] === start.range[1]) {

src/html/parser.ts

@@ -4,7 +4,6 @@
  * See LICENSE file in root directory for full license.
  */
 import assert from "assert"
-import last from "lodash/last"
 import findLastIndex from "lodash/findLastIndex"
 import type {
     ErrorCode,
@@ -160,7 +159,7 @@ function adjustAttributeName(name: string, namespace: Namespace): string {
  */
 function propagateEndLocation(node: VDocumentFragment | VElement): void {
     const lastChild =
-        (node.type === "VElement" ? node.endTag : null) || last(node.children)
+        (node.type === "VElement" ? node.endTag : null) || node.children.at(-1)
     if (lastChild != null) {
         node.range[1] = lastChild.range[1]
         node.loc.end = lastChild.loc.end
@@ -236,7 +235,7 @@ export class Parser {
      * Get the current node.
      */
     private get currentNode(): VDocumentFragment | VElement {
-        return last(this.elementStack) || this.document
+        return this.elementStack.at(-1) || this.document
     }
 
     /**

src/script/index.ts

@@ -3,8 +3,6 @@
  * @copyright 2017 Toru Nagashima. All rights reserved.
  * See LICENSE file in root directory for full license.
  */
-import first from "lodash/first"
-import last from "lodash/last"
 import sortedIndexBy from "lodash/sortedIndexBy"
 import type {
     ESLintArrayExpression,
@@ -521,7 +519,7 @@ function parseFilter(
                     }
                 }
 
-                const token = last(ast.tokens)!
+                const token = ast.tokens!.at(-1)!
                 return throwUnexpectedTokenError(token.value, token)
             }
 
@@ -536,7 +534,7 @@ function parseFilter(
 
         // Update range.
         const firstToken = tokens[0]
-        const lastToken = last(tokens)!
+        const lastToken = tokens.at(-1)!
         expression.range = [firstToken.range[0], lastToken.range[1]]
         expression.loc = { start: firstToken.loc.start, end: lastToken.loc.end }
 
@@ -778,7 +776,7 @@ export function parseExpression(
     }
 
     // Update range.
-    const lastToken = last(ret.tokens)!
+    const lastToken = ret.tokens.at(-1)!
     ret.expression.range[1] = lastToken.range[1]
     ret.expression.loc.end = lastToken.loc.end
 
@@ -933,7 +931,7 @@ function parseVForExpressionForEcmaVersion5(
             if (open != null) {
                 open.value = "("
             }
-            const close = last(parsedAliases.tokens)
+            const close = parsedAliases.tokens.at(-1)
             if (close != null) {
                 close.value = ")"
             }
@@ -977,7 +975,7 @@ function parseVForExpressionForEcmaVersion5(
         comments.push(...parsedIterator.comments)
         const { right, references } = parsedIterator
         const firstToken = tokens[0]
-        const lastToken = last(tokens) || firstToken
+        const lastToken = tokens.at(-1) || firstToken
         const expression: VForExpression = {
             type: "VForExpression",
             range: [firstToken.range[0], lastToken.range[1]],
@@ -1136,8 +1134,8 @@ function parseVOnExpressionBody(
         ).argument as ESLintFunctionExpression
         const block = functionDecl.body
         const body = block.body
-        const firstStatement = first(body)
-        const lastStatement = last(body)
+        const firstStatement = body[0]
+        const lastStatement = body.at(-1)
         const expression: VOnExpression = {
             type: "VOnExpression",
             range: [
@@ -1231,8 +1229,8 @@ export function parseSlotScopeExpression(
         )
         const references = scope.references
         const variables = scope.variables
-        const firstParam = first(params)!
-        const lastParam = last(params)!
+        const firstParam = params[0]
+        const lastParam = params.at(-1)!
         const expression: VSlotScopeExpression = {
             type: "VSlotScopeExpression",
             range: [firstParam.range[0], lastParam.range[1]],
@@ -1330,8 +1328,8 @@ export function parseGenericExpression(
         )
         const references = scope.references
         const variables = scope.variables
-        const firstParam = first(params)!
-        const lastParam = last(params)!
+        const firstParam = params[0]
+        const lastParam = params.at(-1)!
         const expression: VGenericExpression = {
             type: "VGenericExpression",
             range: [firstParam.range[0], lastParam.range[1]],

test/ast.js

@@ -12,7 +12,6 @@
 const assert = require("assert")
 const fs = require("fs")
 const path = require("path")
-const lodash = require("lodash")
 const parser = require("../src")
 const eslint = require("eslint")
 const semver = require("semver")
@@ -116,7 +115,7 @@ function validateParent(source, parserOptions) {
             ruleContext.sourceCode.parserServices.defineTemplateBodyVisitor({
                 "*"(node) {
                     if (stack.length >= 1) {
-                        const parent = lodash.last(stack)
+                        const parent = stack.at(-1)
                         assert(
                             node.parent === parent,
                             `The parent of ${nodeToString(