Fix compliance issue.

Numeric literal may not be used as identifier.

Author: jasny

package.json

@@ -5,6 +5,7 @@
   "publishConfig": {
     "access": "public"
   },
+  "homepage": "https://letsflow.io/jmespath",
   "contributors": [
     {
       "name": "Arnold Daniels",
@@ -43,5 +44,47 @@
   "license": "MPL-2.0",
   "engines": {
     "node": ">=14.0.0"
-  }
+  },
+  "scripts": {
+    "lint": "npx eslint --ignore-path .eslintignore './{src,test}/**/*.{js,ts}'",
+    "lint:fix": "npm run lint -- --fix",
+    "prebuild": "npx rimraf dist",
+    "build": "npx tsc --outDir dist/lib -d --module commonjs && npx rollup -c rollup.config.ts",
+    "perf": "node --expose-gc scripts/perf.js",
+    "start": "npx rollup -c rollup.config.ts -w",
+    "test": "vitest --run",
+    "test:watch": "vitest",
+    "test:prod": "npm run lint && npm run test",
+    "coverage": "vitest run --coverage",
+    "deploy-docs": "ts-node scripts/gh-pages-publish",
+    "report-coverage": "cat ./coverage/lcov.info | coveralls",
+    "precommit": "lint-staged",
+    "prepack": "npx clear-package-json package.json --output ./package.json"
+  },
+  "devDependencies": {
+    "@rollup/plugin-json": "^4.1.0",
+    "@rollup/plugin-node-resolve": "^13.0.0",
+    "@rollup/plugin-terser": "^0.4.0",
+    "@rollup/plugin-typescript": "^8.2.1",
+    "@typescript-eslint/eslint-plugin": "^4.26.0",
+    "@typescript-eslint/parser": "^4.26.0",
+    "@vitest/coverage-v8": "^2.1.8",
+    "clean-publish": "^3.4.5",
+    "coveralls-next": "^4.2.0",
+    "eslint": "^7.27.0",
+    "eslint-config-prettier": "^8.6.0",
+    "eslint-plugin-prettier": "^3.4.1",
+    "husky": "^6.0.0",
+    "lint-staged": "^11.0.0",
+    "prettier": "^2.3.0",
+    "prettier-eslint": "^12.0.0",
+    "rimraf": "^3.0.2",
+    "rollup": "^2.50.5",
+    "rollup-plugin-typescript2": "^0.34.1",
+    "shelljs": "^0.8.4",
+    "tinybench": "^2.5.1",
+    "ts-node": "^10.9.1",
+    "typescript": "^4.3.2",
+    "vitest": "^2.1.8"
+  }  
 }

src/Lexer.ts

@@ -312,7 +312,7 @@ class StreamLexer {
     }
     if (numberLooking.includes(literalString[0])) {
       // eslint-disable-next-line @typescript-eslint/naming-convention
-      const [_, ok] = this.parseJSON(literalString);
+      const [, ok] = this.parseJSON(literalString);
       return ok;
     }
     return false;

src/Parser.ts

@@ -110,7 +110,13 @@ class TokenParser {
     switch (token.type) {
       case Token.TOK_VARIABLE:
         return { type: 'Variable', name: token.value as string };
-      case Token.TOK_NUMBER:
+      case Token.TOK_NUMBER: {
+        if (this.lookahead(0) === Token.TOK_RBRACKET || this.lookahead(0) === Token.TOK_COMMA) {
+          throw new Error('Syntax error: numeric literal is not allowed as identifier.');
+        } else {
+          return { type: 'Literal', value: token.value };
+        }
+      }
       case Token.TOK_LITERAL:
         return { type: 'Literal', value: token.value };
       case Token.TOK_UNQUOTEDIDENTIFIER: {
@@ -191,7 +197,7 @@ class TokenParser {
       }
       case Token.TOK_LPAREN: {
         const args: ExpressionNode[] = [];
-        let expression = this.expression(0);
+        const expression = this.expression(0);
         args.push(expression);
         this.match(Token.TOK_RPAREN);
         return args[0];