When executing prisma generate, an error of TypeError is thrown stating that the collection is

While using typescript with Prisma, I encountered an issue when trying to run prisma generate, as it kept throwing the following error:

TypeError: collection is not iterable.
 at keyBy (/node_modules/@prisma/client/generator-build/index.js:57685:21)
    at Object.getTypeMap (/node_modules/@prisma/client/generator-build/index.js:59468:17)
    at new DMMFHelper (/node_modules/@prisma/client/generator-build/index.js:59365:25)
    at new TSClient (/node_modules/@prisma/client/generator-build/index.js:60630:17)
    at buildClient (/node_modules/@prisma/client/generator-build/index.js:60876:18)
    at generateClient (/node_modules/@prisma/client/generator-build/index.js:60947:47)
    at async LineStream.<anonymous> (/node_modules/@prisma/client/generator-build/index.js:54186:24)

Although I suspect there might be a problem with the settings, I haven't been able to pinpoint the exact reason for this issue.

The versions I am currently using are Prisma 3.9.2, @prisma/client 3.10.0, and macOS operating system.

This is my tsconfig.json file:

{
  "compilerOptions": {
    /* Language and Environment */
    "target": "es2018",

    /* Modules */
    "module": "commonjs",
    "moduleResolution": "node",

    /* Emit */
    "outDir": "./build",
    "rootDir": "./src",
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,

    /* Type Checking */
    "strict": true,
    "skipLibCheck": true
  },
  "include": ["src/**/*"],
  "exclude": ["node_modules"]
}

This is my package.json file:

{
  "scripts": {
    "dev": "nodemon --watch \"src/**/*.ts\" --exec \"ts-node\" src/app.ts",
    "build": "tsc -p tsconfig.json",
    "start": "node build/app.js",
    "prepare": "husky install",
    "lint-staged": "lint-staged"
  }
  ...
}

UPDATE: The issue has been resolved!

I managed to fix it by re-installing Prisma in the devDependencies section, and now everything is working smoothly.

typescriptprismaprisma2

Answer №1

In order to ensure compatibility, it is recommended to update both packages to the most recent version available

yarn add prisma@latest / npm i prisma@latest
yarn add @prisma/client@latest / npm i @prisma/client@latest

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