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Experiencing difficulties integrating 'amazon-cognito-identity-js' in my Ionic app due to the error message "cannot find name 'Buffer'"
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Experiencing difficulties integrating 'amazon-cognito-identity-js' in my Ionic app due to the error message "cannot find name 'Buffer'"
After some digging, I stumbled upon the solution right here:
The key is to include "types": ["node"] in the tsconfig.app.json file that is generated by angular-cli within the src directory. By default, this field is usually left empty.
https://github.com/aws/aws-sdk-js/issues/1271#issuecomment-291658668
Encountered a similar issue when integrating amazon-cognito-identity-js into an Angular 4 application. It seems that Typescript struggles with certain Node types such as Buffer, http, stream, fs, and more. To delve deeper into this matter, it is essential to refer to how Typescript specifies packages for inclusion.
By default, all visible "@types" packages are automatically included in your compilation. Packages located in node_modules/@types within any parent folder are considered visible. This includes packages within ./node_modules/@types/, ../node_modules/@types/, ../../node_modules/@types/, and so forth.
If a specific typesRoots is specified, only packages under that typesRoots directory will be included, as demonstrated below:
{
"compilerOptions": {
"typeRoots" : ["./typings"]
}
}
This configuration file will exclusively include packages from the ./typings directory, omitting those from ./node_modules/@types.
If a list of specific types is defined, only those listed types will be included, like so:
{
"compilerOptions": {
"types" : ["node", "lodash", "express"]
}
}
With this tsconfig.json setup, only packages from ./node_modules/@types/node, ./node_modules/@types/lodash, and ./node_modules/@types/express will be included. Other packages under node_modules/@types/* will not be accounted for.
It may seem cliché, but sometimes copying/pasting the answer is the most efficient way, as the documentation already explains it concisely.
To troubleshoot, verify if the "typeRoots" and/or "types" properties are defined in any of the existing tsconfig.json files (angular-cli projects usually have both a ./tsconfig.json and ./app/tsconfig.app.json file).
If "typeRoots" is specified, make sure to include "node_modules/@types". If "types" is declared, ensure that "node" is part of the list.
To include all @types without filtering, consider removing the "typeRoots" and "types" properties altogether from the "compilerOptions". However, this approach might lead to conflicts between different type declarations. A safer option would be to at least include "node" in the "types" property.
Upon investigating, I discovered several factors that seemed to be contributing to the issue at hand. Special thanks to Benny Neugebauer for providing valuable insights on this topic in his response here: error TS2304: Cannot find name 'Buffer'
The crucial steps I took to resolve this problem were as follows:
Opting for the stable release of Node.js instead of the latest version
Installing the typings tool using npm install -g typings
Adding Type definitions with typings install dt~node --global --save
Ensuring that conflicting type installations are removed – a critical step for compatibility across both Windows and OSX platforms. Execute npm remove @types/node
Removing the node_modules directory and rebuilding it using yarn
Including a reference path in app.component.ts
/// <reference path="../../typings/index.d.ts" />
export class YourClass {
Following these actions, everything started working seamlessly. This approach proved effective in resolving issues faced within both Windows 10 and OSX environments. For reference, below is my updated tsconfig.json file:
{
"compilerOptions": {
"allowSyntheticDefaultImports": true,
"declaration": false,
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"lib": [
"dom",
"es2015"
],
"module": "es2015",
"moduleResolution": "node",
"sourceMap": true,
"target": "es5"
},
"include": [
"src/**/*.ts"
],
"exclude": [
"node_modules"
],
"compileOnSave": false,
"atom": {
"rewriteTsconfig": false
}
}
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