Mocha 6, Babel 7, ES6: SyntaxError: Unexpected token export
Question
I'm trying to create a simple npm package based on another called 'sidebar-v2' ( https://github.com/Turbo87/sidebar-v2 )
For that reason, I've tried to update the JS code to ES6, however when I try to test if the updates are ok, the mocha raises an exception, that I send below:
> @rmmariano/ol-sb@1.0.0-rc.1 test /home/inpe/Documents/datainfo/npm_packages/ol-sb
> mocha --require @babel/register
/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/ol/control.js:5
export {default as Attribution} from './control/Attribution.js';
^^^^^^
SyntaxError: Unexpected token export
at new Script (vm.js:85:7)
at createScript (vm.js:266:10)
at Object.runInThisContext (vm.js:314:10)
at Module._compile (internal/modules/cjs/loader.js:698:28)
at Module._compile (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/pirates/lib/index.js:99:24)
at Module._extensions..js (internal/modules/cjs/loader.js:749:10)
at Object.newLoader [as .js] (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/pirates/lib/index.js:104:7)
at Module.load (internal/modules/cjs/loader.js:630:32)
at tryModuleLoad (internal/modules/cjs/loader.js:570:12)
at Function.Module._load (internal/modules/cjs/loader.js:562:3)
at Module.require (internal/modules/cjs/loader.js:667:17)
at require (internal/modules/cjs/helpers.js:20:18)
at Object.<anonymous> (/home/inpe/Documents/datainfo/npm_packages/ol-sb/src/ol3-sidebar.js:1:1)
at Module._compile (internal/modules/cjs/loader.js:738:30)
at Module._compile (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/pirates/lib/index.js:99:24)
at Module._extensions..js (internal/modules/cjs/loader.js:749:10)
at Object.newLoader [as .js] (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/pirates/lib/index.js:104:7)
at Module.load (internal/modules/cjs/loader.js:630:32)
at tryModuleLoad (internal/modules/cjs/loader.js:570:12)
at Function.Module._load (internal/modules/cjs/loader.js:562:3)
at Module.require (internal/modules/cjs/loader.js:667:17)
at require (internal/modules/cjs/helpers.js:20:18)
at Object.<anonymous> (/home/inpe/Documents/datainfo/npm_packages/ol-sb/src/index.js:1:1)
at Module._compile (internal/modules/cjs/loader.js:738:30)
at Module._compile (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/pirates/lib/index.js:99:24)
at Module._extensions..js (internal/modules/cjs/loader.js:749:10)
at Object.newLoader [as .js] (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/pirates/lib/index.js:104:7)
at Module.load (internal/modules/cjs/loader.js:630:32)
at tryModuleLoad (internal/modules/cjs/loader.js:570:12)
at Function.Module._load (internal/modules/cjs/loader.js:562:3)
at Module.require (internal/modules/cjs/loader.js:667:17)
at require (internal/modules/cjs/helpers.js:20:18)
at Object.<anonymous> (/home/inpe/Documents/datainfo/npm_packages/ol-sb/test/test.js:4:1)
at Module._compile (internal/modules/cjs/loader.js:738:30)
at Module._compile (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/pirates/lib/index.js:99:24)
at Module._extensions..js (internal/modules/cjs/loader.js:749:10)
at Object.newLoader [as .js] (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/pirates/lib/index.js:104:7)
at Module.load (internal/modules/cjs/loader.js:630:32)
at tryModuleLoad (internal/modules/cjs/loader.js:570:12)
at Function.Module._load (internal/modules/cjs/loader.js:562:3)
at Module.require (internal/modules/cjs/loader.js:667:17)
at require (internal/modules/cjs/helpers.js:20:18)
at /home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/mocha/lib/mocha.js:327:36
at Array.forEach (<anonymous>)
at Mocha.loadFiles (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/mocha/lib/mocha.js:324:14)
at Mocha.run (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/mocha/lib/mocha.js:801:10)
at Object.exports.singleRun (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/mocha/lib/cli/run-helpers.js:207:16)
at exports.runMocha (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/mocha/lib/cli/run-helpers.js:300:13)
at Object.exports.handler.argv [as handler] (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/mocha/lib/cli/run.js:296:3)
at Object.runCommand (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/yargs/lib/command.js:238:44)
at Object.parseArgs [as _parseArgs] (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/yargs/yargs.js:1089:24)
at Object.parse (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/yargs/yargs.js:566:25)
at Object.exports.main (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/mocha/lib/cli/cli.js:62:6)
at Object.<anonymous> (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/mocha/bin/_mocha:10:23)
at Module._compile (internal/modules/cjs/loader.js:738:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:749:10)
at Module.load (internal/modules/cjs/loader.js:630:32)
at tryModuleLoad (internal/modules/cjs/loader.js:570:12)
at Function.Module._load (internal/modules/cjs/loader.js:562:3)
at Function.Module.runMain (internal/modules/cjs/loader.js:801:12)
at internal/main/run_main_module.js:21:11
npm ERR! Test failed. See above for more details.
I've already tried to follow the answer of other questions on StackOverflow, such as:
But no one of them worked to me, unfortunately.
When I try to update my .babelrc to:
{
"presets": ["@babel/preset-env", "es2015"]
}
The error changes to:
> @rmmariano/ol-sb@1.0.0-rc.1 test /home/inpe/Documents/datainfo/npm_packages/ol-sb
> mocha --require @babel/register
/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/yargs/yargs.js:1148
else throw err
^
Error: Cannot find module 'babel-preset-es2015' from '/home/inpe/Documents/datainfo/npm_packages/ol-sb'
at Function.module.exports [as sync] (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/resolve/lib/sync.js:58:15)
at resolveStandardizedName (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/files/plugins.js:101:31)
at resolvePreset (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/files/plugins.js:58:10)
at loadPreset (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/files/plugins.js:77:20)
at createDescriptor (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/config-descriptors.js:154:9)
at items.map (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/config-descriptors.js:109:50)
at Array.map (<anonymous>)
at createDescriptors (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/config-descriptors.js:109:29)
at createPresetDescriptors (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/config-descriptors.js:101:10)
at presets (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/config-descriptors.js:47:19)
at mergeChainOpts (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/config-chain.js:320:26)
at /home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/config-chain.js:283:7
at buildRootChain (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/config-chain.js:120:22)
at loadPrivatePartialConfig (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/partial.js:85:55)
at loadFullConfig (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/full.js:43:39)
at loadOptions (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/index.js:27:36)
at OptionManager.init (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/index.js:231:36)
at compile (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/register/lib/node.js:61:42)
at compileHook (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/register/lib/node.js:102:12)
at Module._compile (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/pirates/lib/index.js:93:29)
at Module._extensions..js (internal/modules/cjs/loader.js:749:10)
at Object.newLoader [as .js] (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/pirates/lib/index.js:104:7)
at Module.load (internal/modules/cjs/loader.js:630:32)
at tryModuleLoad (internal/modules/cjs/loader.js:570:12)
at Function.Module._load (internal/modules/cjs/loader.js:562:3)
at Module.require (internal/modules/cjs/loader.js:667:17)
at require (internal/modules/cjs/helpers.js:20:18)
at /home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/mocha/lib/mocha.js:327:36
at Array.forEach (<anonymous>)
at Mocha.loadFiles (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/mocha/lib/mocha.js:324:14)
at Mocha.run (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/mocha/lib/mocha.js:801:10)
at Object.exports.singleRun (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/mocha/lib/cli/run-helpers.js:207:16)
at exports.runMocha (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/mocha/lib/cli/run-helpers.js:300:13)
at Object.exports.handler.argv [as handler] (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/mocha/lib/cli/run.js:296:3)
at Object.runCommand (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/yargs/lib/command.js:238:44)
at Object.parseArgs [as _parseArgs] (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/yargs/yargs.js:1089:24)
at Object.parse (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/yargs/yargs.js:566:25)
at Object.exports.main (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/mocha/lib/cli/cli.js:62:6)
at Object.<anonymous> (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/mocha/bin/_mocha:10:23)
at Module._compile (internal/modules/cjs/loader.js:738:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:749:10)
at Module.load (internal/modules/cjs/loader.js:630:32)
at tryModuleLoad (internal/modules/cjs/loader.js:570:12)
at Function.Module._load (internal/modules/cjs/loader.js:562:3)
at Function.Module.runMain (internal/modules/cjs/loader.js:801:12)
at internal/main/run_main_module.js:21:11
npm ERR! Test failed. See above for more details.
package.json
{
...
"scripts": {
"start": "nodemon --exec babel-node ./src/index.js",
"test": "./node_modules/.bin/mocha --require @babel/register"
},
"devDependencies": {
"@babel/cli": "^7.2.3",
"@babel/core": "^7.3.4",
"@babel/node": "^7.2.2",
"@babel/preset-env": "^7.3.4",
"@babel/register": "^7.0.0",
"chai": "^4.2.0",
"mocha": "^6.0.2",
"nodemon": "^1.18.10"
},
"dependencies": {
"ol": "^5.3.1"
}
}
.babelrc
{
"presets": ["@babel/preset-env"]
}
Could someone help me?
Source code can be found here: https://github.com/rmmariano/ol-sb
Edit 1:
I've tried to update my .babelrc to:
{
"presets": ["@babel/preset-env", "es2015"]
}
And to install the package:
npm install -S babel-preset-es2015
But the following error starts to appear when I run "npm test":
> @rmmariano/ol-sb@1.0.0-rc.1 test /home/inpe/Documents/datainfo/npm_packages/ol-sb
> mocha --require @babel/register
/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/yargs/yargs.js:1148
else throw err
^
Error: Plugin/Preset files are not allowed to export objects, only functions. In /home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/babel-preset-es2015/lib/index.js
at createDescriptor (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/config-descriptors.js:178:11)
at items.map (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/config-descriptors.js:109:50)
at Array.map (<anonymous>)
at createDescriptors (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/config-descriptors.js:109:29)
at createPresetDescriptors (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/config-descriptors.js:101:10)
at presets (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/config-descriptors.js:47:19)
at mergeChainOpts (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/config-chain.js:320:26)
at /home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/config-chain.js:283:7
at buildRootChain (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/config-chain.js:120:22)
at loadPrivatePartialConfig (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/partial.js:85:55)
at loadFullConfig (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/full.js:43:39)
at loadOptions (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/config/index.js:27:36)
at OptionManager.init (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/core/lib/index.js:231:36)
at compile (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/register/lib/node.js:61:42)
at compileHook (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/@babel/register/lib/node.js:102:12)
at Module._compile (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/pirates/lib/index.js:93:29)
at Module._extensions..js (internal/modules/cjs/loader.js:749:10)
at Object.newLoader [as .js] (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/pirates/lib/index.js:104:7)
at Module.load (internal/modules/cjs/loader.js:630:32)
at tryModuleLoad (internal/modules/cjs/loader.js:570:12)
at Function.Module._load (internal/modules/cjs/loader.js:562:3)
at Module.require (internal/modules/cjs/loader.js:667:17)
at require (internal/modules/cjs/helpers.js:20:18)
at /home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/mocha/lib/mocha.js:327:36
at Array.forEach (<anonymous>)
at Mocha.loadFiles (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/mocha/lib/mocha.js:324:14)
at Mocha.run (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/mocha/lib/mocha.js:801:10)
at Object.exports.singleRun (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/mocha/lib/cli/run-helpers.js:207:16)
at exports.runMocha (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/mocha/lib/cli/run-helpers.js:300:13)
at Object.exports.handler.argv [as handler] (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/mocha/lib/cli/run.js:296:3)
at Object.runCommand (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/yargs/lib/command.js:238:44)
at Object.parseArgs [as _parseArgs] (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/yargs/yargs.js:1089:24)
at Object.parse (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/yargs/yargs.js:566:25)
at Object.exports.main (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/mocha/lib/cli/cli.js:62:6)
at Object.<anonymous> (/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/mocha/bin/_mocha:10:23)
at Module._compile (internal/modules/cjs/loader.js:738:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:749:10)
at Module.load (internal/modules/cjs/loader.js:630:32)
at tryModuleLoad (internal/modules/cjs/loader.js:570:12)
at Function.Module._load (internal/modules/cjs/loader.js:562:3)
at Function.Module.runMain (internal/modules/cjs/loader.js:801:12)
at internal/main/run_main_module.js:21:11
npm ERR! Test failed. See above for more details.
Edit 2:
I've tried to update my .babelrc to:
{
"presets": ["@babel/preset-env", "@babel/preset-es2015"]
}
And to install the package:
npm install -S @babel/preset-es2015
But the following error starts to appear when I run "npm test":
> @rmmariano/ol-sb@1.0.0-rc.1 test /home/inpe/Documents/datainfo/npm_packages/ol-sb
> mocha --require @babel/register
/home/inpe/Documents/datainfo/npm_packages/ol-sb/node_modules/yargs/yargs.js:1148
else throw err
^
Error: Cannot find module '@babel/preset-es2015' from '/home/inpe/Documents/datainfo/npm_packages/ol-sb'
6 answers
solution1
0 2019-03-14 18:21:58
I get your code on github, and I see your problem.
This problem is in your ol3-sidebar.js , in this file on first line you import a function from file ol/control.js , but this file is not present in your workspace. So it is giving error when running the tests.
solution2
0 2019-04-04 23:34:58
I had the same problem. And managed to solve it after re-installing windows and it still not working.
For me it was that the project folder was on a different drive accessed via a symbolic link. I have a small SSD for boot so keep project folders on a second larger disk drive, and symlink from my home directory to this folder.
If i navigate directly to the folder it works.
I'll report this to both Mocha and Babel teams. I'm not sure who's problem this is.
solution3
0 2019-06-09 10:12:44
I think your problem(s) come from Babel. Try first:
npx babel-upgrade
to see the modifications that the package babel-upgrade will do without applying them, and if your are satisfied:
npx babel-upgrade --write
to apply the modifications.
solution4
0 2019-08-08 15:59:44
I had a similar problem and had to run
npm install --save-dev core-js@3
My .bablerc was:
{
"presets": [["@babel/preset-env"]]
}
solution5
0 2020-06-12 07:50:25
Short solution. I had a similar problem with imports and exports.
Also, Babel did not work well with mocha version 7.2.0 and npm version 6.14.4 . So I solved the problem using esm version 3.2.25 .
npm install --save-dev esm
My package.json is using this:
"scripts": {
"test": "mocha -r esm --exit"
}
solution6
0 2020-12-02 15:34:50
I was searching through the whole internet to find a solution. I came up with this:
npx mocha --require ts-node/register --require esm src/**/*.spec.ts
Or in package.json scripts (both options work, choose whichever you like):
"scripts": {
"test": "mocha -r esm -r ts-node/register src/**/*.spec.ts",
"test-ts": "ts-mocha -r esm -p tsconfig.json src/**/*.spec.ts"
}
And don't forget to add esm to devDependencies :
npm install --save-dev esm
so in package.json it is gonna be
"devDependencies": {
"esm": "^3.2.25"
}
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