diff --git a/lib/moduleEnv.js b/lib/moduleEnv.js index 6754273..cbb76d9 100644 --- a/lib/moduleEnv.js +++ b/lib/moduleEnv.js @@ -1,17 +1,48 @@ "use strict"; +// TODO: Use https://www.npmjs.com/package/pirates here? + var Module = require("module"), fs = require("fs"), - babelCore = require("babel-core"), + eslint = require("eslint"), coffee; var moduleWrapper0 = Module.wrapper[0], moduleWrapper1 = Module.wrapper[1], originalExtensions = {}, - babelPlugins = [ - "babel-plugin-transform-es2015-block-scoping", - "babel-plugin-transform-object-rest-spread" - ], + linter = new eslint.Linter(), + eslintOptions = { + env: { + es6: true, + }, + parserOptions: { + ecmaVersion: 6, + ecmaFeatures: { + globalReturn: true, + jsx: true, + experimentalObjectRestSpread: true + }, + }, + rules: { + "no-const-assign": 2 + } + }, + // The following regular expression is used to replace const declarations with let. + // This regex replacement is not 100% safe because transforming JavaScript requires an actual parser. + // However, parsing (e.g. via babel) comes with its own problems because now the parser needs to + // be aware of syntax extensions which might not be supported by the parser, but the underlying + // JavaScript engine. In fact, rewire used to have babel in place here but required an extra + // transform for the object spread operator (check out commit d9a81c0cdacf6995b24d205b4a2068adbd8b34ff + // or see https://github.com/jhnns/rewire/pull/128). It was also notable slower + // (see https://github.com/jhnns/rewire/issues/132). + // There is another issue: replacing const with let is not safe because of their different behavior. + // That's why we also have ESLint in place which tries to identify this error case. + // There is one edge case though: when a new syntax is used *and* a const re-assignment happens, + // rewire would compile happily in this situation but the actual code wouldn't work. + // However, since most projects have a seperate linting step which catches these const re-assignment + // errors anyway, it's probably still a reasonable trade-off. + // Test the regular expresssion at https://regex101.com/r/dvnZPv/2 and also check out testLib/constModule.js. + matchConst = /(^|\s|\}|;)const(\/\*|\s)/gm, nodeRequire, currentModule; @@ -72,17 +103,27 @@ function restoreExtensions() { } } +function isNoConstAssignMessage(message) { + return message.ruleId === "no-const-assign"; +} + function jsExtension(module, filename) { var _compile = module._compile; module._compile = function (content, filename) { - content = babelCore.transform(content, { - plugins: babelPlugins, - retainLines: true, - filename: filename, - babelrc: false - }).code; - _compile.call(module, content, filename); + const noConstAssignMessage = linter.verify(content, eslintOptions).find(isNoConstAssignMessage); + + if (noConstAssignMessage !== undefined) { + const { line, column } = noConstAssignMessage; + + throw new TypeError(`Assignment to constant variable at ${ filename }:${ line }:${ column }`); + } + + _compile.call( + module, + content.replace(matchConst, "$1let$2"), // replace const with let + filename + ); }; restoreExtensions(); @@ -113,9 +154,6 @@ function stripBOM(content) { return content; } -// Prepopulate require.cache with babel plugins because otherwise it will be lazy-loaded by Babel during rewire() -babelPlugins.forEach(require); - try { coffee = require("coffee-script"); } catch (err) { diff --git 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"sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=" }, "wrappy": { "version": "1.0.2", "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz", - "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=", - "dev": true + "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=" + }, + "write": { + "version": "0.2.1", + "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz", + "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=", + "requires": { + "mkdirp": "0.5.1" + } + }, + "yallist": { + "version": "2.1.2", + "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz", + "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=" } } } diff --git a/package.json b/package.json index 579b88f..436dbf0 100644 --- a/package.json +++ b/package.json @@ -40,8 +40,6 @@ "coverage": "istanbul cover ./node_modules/mocha/bin/_mocha" }, "dependencies": { - "babel-core": "^6.26.0", - "babel-plugin-transform-es2015-block-scoping": "^6.26.0", - "babel-plugin-transform-object-rest-spread": "^6.26.0" + "eslint": "^4.19.1" } } diff --git a/testLib/constModule.js b/testLib/constModule.js index 77396d9..efff495 100644 --- a/testLib/constModule.js +++ b/testLib/constModule.js @@ -1,13 +1,42 @@ -const someOtherModule = require("./someOtherModule"); -const language = "nl"; +const j = "j"; // At the beginning of the file +// This module contains some weird combinations where valid const declarations could appear. +// Syntax oddities are totally on purpose here. +const a = require("./someOtherModule");const b = "b"; const e = "e" +const c = "c"; +{}const d = "d"; + const f = "f"; // there's an irregular whitespace before and after const +const +g = "g"; +const/*wtf this is valid*/h = "h"; +const /*and this is also*/i = "i"; -exports.getLang = () => { - return language; +exports.a = function () { + return a; }; - -exports.getOtherModuleName = () => { - return someOtherModule.name; +exports.b = function () { + return b; +}; +exports.c = function () { + return c; +}; +exports.d = function () { + return d; +}; +exports.e = function () { + return e; +}; +exports.f = function () { + return f; +}; +exports.g = function () { + return g; +}; +exports.h = function () { + return h; +}; +exports.i = function () { + return i; +}; +exports.j = function () { + return j; }; - -exports.filename = __filename; -exports.dirname = __dirname; diff --git a/testLib/sharedTestCases.js b/testLib/sharedTestCases.js index 991453b..611a1d6 100644 --- a/testLib/sharedTestCases.js +++ b/testLib/sharedTestCases.js @@ -220,34 +220,24 @@ module.exports = function () { expect(rewired.__get__("someVar")).to.be("hello"); }); - it("should not be a problem to have a module that exports a boolean", function() { - expect(function() { - var rewired = rewire("./boolean.js"); - }).to.not.throwException(); + it("should not be a problem to have a module that exports a boolean", function( ) { + rewire("./boolean.js"); // should not throw }); - it("should not be a problem to have a module that exports null", function() { - expect(function() { - var rewired = rewire("./null.js"); - }).to.not.throwException(); + it("should not be a problem to have a module that exports null", function () { + rewire("./null.js"); // should not throw }); - it("should not be a problem to have a module that exports a sealed object", function() { - expect(function() { - var rewired = rewire("./sealedObject.js"); - }).to.not.throwException(); + it("should not be a problem to have a module that exports a sealed object", function () { + rewire("./sealedObject.js"); // should not throw }); - it("should not be a problem to have a module that uses object spread operator", function() { - expect(function() { - var rewired = rewire("./objectSpreadOperator.js"); - }).to.not.throwException(); + it("should not be a problem to have a module that uses object spread operator", function () { + rewire("./objectSpreadOperator.js"); // should not throw }); - it("should not be a problem to have a module that uses object rest operator", function() { - expect(function() { - var rewired = rewire("./objectRestOperator.js"); - }).to.not.throwException(); + it("should not be a problem to have a module that uses object rest operator", function () { + rewire("./objectRestOperator.js"); // should not throw }); it("should not influence the original require if nothing has been required within the rewired module", function () { @@ -384,22 +374,19 @@ module.exports = function () { revert(); }); - it("should be possible to mock a set a const variable using __set__ syntax", function() { + it("should be possible to set a const variable", function () { var constModule = rewire("./constModule"); - constModule.__set__("language", "de"); - constModule.__set__("someOtherModule", { - name: "differentModule" + "abcdefghij".split("").forEach(letter => { + constModule.__set__(letter, "this has been changed"); // should not throw + expect(constModule[letter]()).to.equal("this has been changed"); }); - expect(constModule.getLang()).to.equal("de"); - expect(constModule.getOtherModuleName()).to.equal("differentModule"); - }) - - it("should have correct __filename and __dirname when mocked using convertConst", function() { - var constModule = rewire("./constModule"); + }); - expect(constModule.filename).to.equal(require("./constModule").filename); - expect(constModule.dirname).to.equal(require("./constModule").dirname); + it("should fail with a helpful TypeError when const is re-assigned", function () { + expect(function () { + rewire("./wrongConstModule"); + }).to.throwException(/^Assignment to constant variable at .+?wrongConstModule\.js:4:1$/); }); }; diff --git a/testLib/throwError.js b/testLib/throwError.js index ffb6a71..e85ea36 100644 --- a/testLib/throwError.js +++ b/testLib/throwError.js @@ -1,4 +1,4 @@ -// Using const here because we know that Babel will transform that part +// Using deliberately const here because we know that we're transform const to let const test = 1; module.exports = function () { diff --git a/testLib/wrongConstModule.js b/testLib/wrongConstModule.js new file mode 100644 index 0000000..901892c --- /dev/null +++ b/testLib/wrongConstModule.js @@ -0,0 +1,4 @@ +// Assigning to a const should fail +const a = "a"; + +a = "b";