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After I create a sample react app using create-react-app, npm start fails.
I have tried this using node 11.4 and 10.4 (npm 6.4.1)
npm install create-react-app -g
create-react-app t2
cd t2
npm start
To be able to start simple react server to hit in browser at localhost:3000
Server did not start, got this in my terminal:
$ npm start > [email protected] start /Users/samr/dev/githubs/react/t2 > react-scripts start /Users/samr/dev/githubs/react/t2/node_modules/ajv/lib/keyword.js:65 throw new Error('custom keyword definition is invalid: ' + this.errorsText(validateDefinition.errors)); ^ Error: custom keyword definition is invalid: data.errors should be boolean at Ajv.addKeyword (/Users/samr/dev/githubs/react/t2/node_modules/ajv/lib/keyword.js:65:13) at module.exports (/Users/samr/dev/githubs/react/t2/node_modules/ajv-errors/index.js:10:7) at Object.<anonymous> (/Users/samr/dev/githubs/react/t2/node_modules/schema-utils/src/validateOptions.js:22:1) at Module._compile (internal/modules/cjs/loader.js:723:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:734:10) at Module.load (internal/modules/cjs/loader.js:620:32) at tryModuleLoad (internal/modules/cjs/loader.js:560:12) at Function.Module._load (internal/modules/cjs/loader.js:552:3) at Module.require (internal/modules/cjs/loader.js:659:17) at require (internal/modules/cjs/helpers.js:22:18) npm ERR! code ELIFECYCLE npm ERR! errno 1 npm ERR! [email protected] start: `react-scripts start` npm ERR! Exit status 1 npm ERR! npm ERR! Failed at the [email protected] start script. npm ERR! This is probably not a problem with npm. There is likely additional logging output above. npm ERR! A complete log of this run can be found in: npm ERR! /Users/samr/.npm/_logs/2019-02-09T23_19_40_848Z-debug.log
763
Check the ignore-script config If you see the start script is present inside your package. json file but still can't run the script, you need to check the console output. If there's no output at all, then you may have the ignore-scripts npm configuration set to true .
If you try to run the command from a different directory, it won't find your package. json file and the Missing script: "start" npm error is caused. If you don't have a package. json file, create one by opening your terminal in your project's root directory and running the command npm init -y .
Prerequisites. In order to create React application, you will need to have a Node that is >= 14.0. 0 and npm >= 5.6. As we discussed earlier npm is a package manager that comes with Node.
i had this issue. The simple solution is to add latest versions of typescript, react-scripts libs. and then run npm install. it works for me.
As @atsnam has said, you can find the resolution here https://github.com/webpack/webpack/issues/8768.
add below to package.json
"resolutions": {
"ajv": "6.8.1"
}
then run yarn install
if you use npm
npm uninstall ajv
npm install [email protected]
That worked for me
148
Quick fix is mentioned here :
Essentially go to node_modules/ajv/lib/keyword.js and comment out lines 64 and 65.
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