两个输出文件共享相同的路径，但内容不同。

Question

我在使用nearley.js为解析器构建语法时遇到了这个错误。我有三个文件: grammar.ne、grammar.js和parser.js。完整的错误如下：

$ ./.config/build.sh
 > error: Two output files share the same path but have different contents: .build/grammar.js.map

 > error: Two output files share the same path but have different contents: .build/grammar.js

exit status 1

以下是每个文件的内容：

grammar.ne:

main -> (statement "\n"):+
statement -> "foo" | "bar"

grammar.js:

// Generated automatically by nearley, version 2.20.1
// http://github.com/Hardmath123/nearley
import Lexer from './lexer';

(function() {
  function id(x) { return x[0]; }
  var grammar = {
    Lexer: Lexer,
    ParserRules: [
      { "name": "main$ebnf$1$subexpression$1", "symbols": ["statement", { "literal": "\n" }] },
      { "name": "main$ebnf$1", "symbols": ["main$ebnf$1$subexpression$1"] },
      { "name": "main$ebnf$1$subexpression$2", "symbols": ["statement", { "literal": "\n" }] },
      { "name": "main$ebnf$1", "symbols": ["main$ebnf$1", "main$ebnf$1$subexpression$2"], "postprocess": function arrpush(d) { return d[0].concat([d[1]]); } },
      { "name": "main", "symbols": ["main$ebnf$1"] },
      { "name": "statement$string$1", "symbols": [{ "literal": "f" }, { "literal": "o" }, { "literal": "o" }], "postprocess": function joiner(d) { return d.join(''); } },
      { "name": "statement", "symbols": ["statement$string$1"] },
      { "name": "statement$string$2", "symbols": [{ "literal": "b" }, { "literal": "a" }, { "literal": "r" }], "postprocess": function joiner(d) { return d.join(''); } },
      { "name": "statement", "symbols": ["statement$string$2"] }
    ]
    , ParserStart: "main"
  }
  if (typeof module !== 'undefined' && typeof module.exports !== 'undefined') {
    module.exports = grammar;
  } else {
    grammar = grammar;
  }
})();

const nearley = require("nearley");
const grammar = require("./grammar.js");

const parser = new nearley.Parser(nearley.Grammar.fromCompiled(grammar));

parser.feed("foo\n");

console.log(JSON.stringify(parser.results));

我在网上发现的任何东西都没有帮助。这是在TypeScript里构建的，如果这有帮助的话，我有一个用TypeScript编写的lexer。

Answer 1

我解决了这个问题。在我的package.json中，当我应该使用"commonjs"时，我已经使用了模块"es2015"。然后，我将grammar.js的文件扩展名更改为.cjs，从而消除了所有自动生成的代码错误。我还向包json npx nearleyc grammar.ne -o grammar.cjs && node parser.cjs添加了一个脚本，它允许我更快地执行语法文件的编译，并使用新的.cjs扩展将其编译为CommonJS模块；这还允许我同时运行测试文件。