@Types/Sequelize Error TS1086: An accessor cannot be declared in ambient context

Question

I have a project that shows this error when I run 'tsc':

../modules/node_modules/sequelize/types/lib/transaction.d.ts:33:14 - error TS1086: An accessor cannot be declared in an ambient context.

33   static get LOCK(): LOCK;
                ~~~~

../modules/node_modules/sequelize/types/lib/transaction.d.ts:40:7 - error TS1086: An accessor cannot be declared in an ambient context.

40   get LOCK(): LOCK;
         ~~~~

My versions are:

• "@types/sequelize": "^4.28.6"
• "sequelize": "^5.8.10"
• "sequelize-typescript": "1.0.0-beta.4"

The project works fine with nodemon but fails when I try to compile the typescript. Anyone knows this error?

Thanks.

Solution 1

you need to use typescript 3.7.

from typescript 3.7 release notes:

To detect the issue around accessors, TypeScript 3.7 will now emit get/set accessors in .d.ts files so that in TypeScript can check for overridden accessors.

so presumably sequelize was compiled with typescript 3.7 and emits definition files that previous versions don't understand. So you'll need to upgrade to typescript 3.7 or use an earlier version of sequelize.

Solution 2

I have Angular 8. it is working with typescript version of 3.4.5. so solve this issue do below steps.

step 1) go to the tsconfig.json file

step 2) add skipLibCheck: true in "compilerOptions" object. It works for me.

"compilerOptions": {
    "module": "commonjs",
    "moduleResolution": "node",
    "strict": true,
    "target": "es5",
    "declaration": true,
    "declarationDir": "dist-debug/",
    "skipLibCheck": true, /// Needs to be true to fix wrong alias types being used

  },

Solution 3

Setting "skipLibCheck": true worked for me.

Comments

[Shlomi Levi]

What if I can't upgrade to 3.7? have another idea?

[Aviad Hadad]

@ShlomiLevi Use an earlier version of @types/sequelize

[Thiago Valentim]

you are right, I had this issue recently and after some searches I discoreved an issue closed in the Github, so to fix the problem I had to upgrade the typescript version to the 3.7.2 version.

[Fluqz]

ERROR in The Angular Compiler requires TypeScript >=3.1.1 and <3.2.0 but 3.7.4 was found instead. Im using Angular 7

[krishn Patel]

In which file I need to change this?

[29er]

tsconfig.json file

[Алексей Медведев]

Thanks. "skipLibCheck": true(added to tsconfig that related to NestJs), worked and NestJs with app that inited through nest g ng-app.

[pontusv]

This was a better solution than upgrading our Typescript version. Thanks