javascriptangularangular-cli

Angular Cannot Find Name Buffer


I keep getting this error when trying to use Jimp to execute the code bellow. I read around the issues and found that there were issues with buffer in version .28. I downgraded to .27 and this didn't help. I was wondering if this was still an issue or if I incorrectly imported the files.

ERROR in node_modules/jimp/jimp.d.ts(18,24): error TS2304: Cannot find name 'Buffer'.

I think this may be an error with the .d.ts file because I'm not using buffer in the code.

I have imported the type for Jimp into my dev dependencies (npm i --save-dev @types/node), but the new version of Jimp says it doesnt need these types it has its own. I have also put "types":["node"] into my tsconfig.json file.

Code

import { Component, OnInit } from '@angular/core';
import * as jimp from 'jimp';

@Component({
  selector: 'app-jimp-test',
  templateUrl: './jimp-test.component.html',
  styleUrls: ['./jimp-test.component.css']
})
export class JimpTestComponent implements OnInit {

  constructor() { }

  ngOnInit() {
    this.testJimp();
  }

  testJimp() {
    jimp.read('assets/testInput.jpg').then( (img) => {
      img.clone().blur(1).write('assets/testOutput.jpg');
    });
  }

}

Dependencies

{
  "name": "my-playground",
  "version": "0.0.0",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^6.0.3",
    "@angular/common": "^6.0.3",
    "@angular/compiler": "^6.0.3",
    "@angular/core": "^6.0.3",
    "@angular/forms": "^6.0.3",
    "@angular/http": "^6.0.3",
    "@angular/platform-browser": "^6.0.3",
    "@angular/platform-browser-dynamic": "^6.0.3",
    "@angular/router": "^6.0.3",
    "core-js": "^2.5.4",
    "jimp": "^0.2.28",
    "rxjs": "^6.0.0",
    "zone.js": "^0.8.26"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.6.8",
    "@angular/cli": "~6.0.8",
    "@angular/compiler-cli": "^6.0.3",
    "@angular/language-service": "^6.0.3",
    "@types/jasmine": "~2.8.6",
    "@types/jasminewd2": "~2.0.3",
    "@types/jimp": "^0.2.28",
    "@types/node": "^8.9.5",
    "codelyzer": "~4.2.1",
    "jasmine-core": "~2.99.1",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~1.7.1",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.0",
    "karma-jasmine": "~1.1.1",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.3.0",
    "ts-node": "~5.0.1",
    "tslint": "~5.9.1",
    "typescript": "~2.7.2"
  }
}

Angular Versions

@angular-devkit/architect         0.6.8
@angular-devkit/build-angular     0.6.8
@angular-devkit/build-optimizer   0.6.8
@angular-devkit/core              0.6.8
@angular-devkit/schematics        0.6.8
@angular/cli                      6.0.8
@ngtools/webpack                  6.0.8
@schematics/angular               0.6.8
@schematics/update                0.6.8
rxjs                              6.2.1
typescript                        2.7.2
webpack                           4.8.3

Jimp Version

0.2.28

tsconfig.json

{
  "compileOnSave": false,
  "compilerOptions": {
    "baseUrl": "./",
    "outDir": "./dist/out-tsc",
    "sourceMap": true,
    "declaration": false,
    "moduleResolution": "node",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "target": "es5",
    "typeRoots": [
      "node_modules/@types"
    ],
    "lib": [
      "es2017",
      "dom"
    ]
  }
}

tsconfig.app.json

{
  "extends": "../tsconfig.json",
  "compilerOptions": {
    "outDir": "../out-tsc/app",
    "module": "es2015",
    "types": []
  },
  "exclude": [
    "src/test.ts",
    "**/*.spec.ts"
  ]
}

Solution

  • You can try this:

    This line should be on top:

    declare const Buffer
    

    and it should compile without errors.

    With new version of Typescript, you can also use official declaration files:

    npm i -g typescript@next
    npm i --save-dev @types/node
    

    and add "types" : ["node"] in tsconfig.app.json file.