This file is indexed.

/usr/lib/nodejs/acorn/index.js is in node-acorn 5.4.1+ds1-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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"use strict";
exports.parse = parse, exports.parseExpressionAt = parseExpressionAt, exports.tokenizer = tokenizer, exports.addLooseExports = addLooseExports;
var $$state$$ = require("./state"), $$parseutil$$ = require("./parseutil"), $$statement$$ = require("./statement"), $$lval$$ = require("./lval"), $$expression$$ = require("./expression"), $$location$$ = require("./location"), $$scope$$ = require("./scope"), $$options$$ = require("./options"), $$locutil$$ = require("./locutil"), $$node$$ = require("./node"), $$tokentype$$ = require("./tokentype"), $$tokencontext$$ = require("./tokencontext"), $$identifier$$ = require("./identifier"), $$tokenize$$ = require("./tokenize"), $$whitespace$$ = require("./whitespace");
const version = "5.4.1";

function parse(input, options) {
  return new $$state$$.Parser(options, input).parse()
}

function parseExpressionAt(input, pos, options) {
  let p = new $$state$$.Parser(options, input, pos)
  p.nextToken()
  return p.parseExpression()
}

function tokenizer(input, options) {
  return new $$state$$.Parser(options, input)
}

let parse_dammit, LooseParser, pluginsLoose;

function addLooseExports(parse, Parser, plugins) {
  exports.parse_dammit = parse_dammit = parse // eslint-disable-line camelcase
  exports.LooseParser = LooseParser = Parser
  exports.pluginsLoose = pluginsLoose = plugins
}

exports.Parser = $$state$$.Parser, exports.plugins = $$state$$.plugins, exports.defaultOptions = $$options$$.defaultOptions, exports.Position = $$locutil$$.Position, exports.SourceLocation = $$locutil$$.SourceLocation, exports.getLineInfo = $$locutil$$.getLineInfo, exports.Node = $$node$$.Node, exports.TokenType = $$tokentype$$.TokenType, exports.tokTypes = $$tokentype$$.types, exports.keywordTypes = $$tokentype$$.keywordTypes, exports.TokContext = $$tokencontext$$.TokContext, exports.tokContexts = $$tokencontext$$.types, exports.isIdentifierChar = $$identifier$$.isIdentifierChar, exports.isIdentifierStart = $$identifier$$.isIdentifierStart, exports.Token = $$tokenize$$.Token, exports.isNewLine = $$whitespace$$.isNewLine, exports.lineBreak = $$whitespace$$.lineBreak, exports.lineBreakG = $$whitespace$$.lineBreakG, exports.nonASCIIwhitespace = $$whitespace$$.nonASCIIwhitespace, exports.version = version, exports.parse_dammit = parse_dammit, exports.LooseParser = LooseParser, exports.pluginsLoose = pluginsLoose;