CODEWITHSUNDEEP
angulartypescriptnpmversionglobal
guilhebl
guilhebl

Reputation: 8990

The Angular Compiler requires TypeScript >=2.7.2 and <2.8.0 but 2.8.3 was found instead

I starting getting this error on my Angular app:

The Angular Compiler requires TypeScript >=2.7.2 and <2.8.0 but 2.8.3 was found instead

and when I try to downgrade typescript to the right version doing:

npm install -g [email protected] it says updated 1 package.

when I verify typescript version using npm view typescript version I still get 2.8.3

I even tried removing typescript entirely using npm uninstall -g typescript

but when I verify typescript version again npm view typescript version I still get 2.8.3

What are the commands to properly purge and restore typescript to a previous version such as 2.7.2?

I'm running node v10.0.0 and npm v6.0.1

When I run npm list -g typescript I see the correct version coming 2.7.2 but still version 2.8.3 is installed somehow globally

Upvotes: 56

Views: 68372

Answers (9)

Deva
Deva

Reputation: 2121

This is just because in your projects package.json file has

eg."devDependencies": {"typescript": "~2.8.3" }

and in your machine where angular cli installed has "typescript": "2.7.2" version.

You can check this by ng -v or ng v.

So, just open package.json update your typescript version and run npm install and you are done.

Upvotes: 0

Prakash Kumar Behera
Prakash Kumar Behera

Reputation: 11

To upgrade, run the following commands in the terminal.

  • Install the latest version of NPM

    npm install npm@latest -g

  • Run audit

    npm audit

  • Update the NPM

    npm update

  • Run the NPM run script.

    npm start

Now your compiler is ready.

Upvotes: 1

bakke2ooo
bakke2ooo

Reputation: 11

Had the same issue (amongst many others) after updating to macOS Mojave. Fixed it by removing node_modules and package_lock.json manually, changed in package.json from "typescript": "~2.7.2" to "typescript": "~2.8.0" and ran npm install.

Upvotes: 0

Vipisanan
Vipisanan

Reputation: 1

Downgrading to typescript 2.9.2 (npm install [email protected]) and re-running ng update --all still yields the error (twice):

Package "@angular/compiler-cli" has an incompatible peer dependency to "typescript" (requires ">=2.7.2 <2.10", would install "3.1.3"
Verified that version 2.9.2 of typescript was in node_modules.

Upvotes: 0

Demven Weir
Demven Weir

Reputation: 894

Installing "@angular/compiler-cli": "7.0.0-beta.4" resolved this issue. I use "typescript": "3.0.3".

Upvotes: 1

myhouse
myhouse

Reputation: 1991

You should do npm install typescript@'>=2.7.2 <2.8.0'. This will install the correct typescript your project needs. Make sure you run this inside your Angular project.

On Windows, you should use double quotes instead of single quotes, like so:

npm install typescript@">=2.7.2 <2.8.0"

Otherwise, you'll get The system cannot find the file specified..

Upvotes: 79

Andres SoN
Andres SoN

Reputation: 41

I did the following:

  • Delete manually the folder node_modules
  • Delete manually the file package-lock.json

  • In the file package.json be sure to set the dependence of TypeScript as

     "typescript": "2.7.2"

  • run npm cache clean -f

  • run npm install

That work for me.

Upvotes: 2

Ilya Afanasyev
Ilya Afanasyev

Reputation: 61

I did next steps:

  • removed package-lock.json;
  • npm install -g --save [email protected];
  • npm uninstall -g --save [email protected];
  • in package.json, section "devDependencies" updated string with typescript as "typescript": "~2.7.2".

After all above run in project's terminal ng serve --open (I've been using IDEA 2018.1).

Upvotes: 5

knnhcn
knnhcn

Reputation: 1151

In your project folder run again npm install [email protected] as stated from here:

Want to upgrade project from Angular v5 to Angular v6

Then it should work.

Upvotes: 10

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