Encountering errors in Typescript build due to issues in the node_modules directory

While running a typescript build, I encountered errors in the node_modules folder. Despite having it listed in the exclude section of my tsconfig.json file, the errors persist. What's puzzling is that another project with identical gulpfile.js, tsconfig.json, and node_modules folders doesn't throw these errors. What other factors should I investigate?

The errors are as follows:

c:/Dev/streak-maker/node_modules/angular2/src/core/change_detection/parser/locals.d.ts(3,14): error TS2304: Cannot find name 'Map'.
c:/Dev/streak-maker/node_modules/angular2/src/core/change_detection/parser/locals.d.ts(4,42): error TS2304: Cannot find name 'Map'.
... (additional error list)

Here is an excerpt from my tsconfig.json file:

{
  "version": 3,
  "compilerOptions": {
    "target": "es5",
    "module": "system",
    "moduleResolution": "node",
    "sourceMap": false,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "removeComments": false,
    "noImplicitAny": false
  },
  "exclude": [
    "node_modules",
    "jspm_packages"
  ]
}

Additionally, here is the relevant part of my gulpfile.js where I'm executing the build-typescript task:

/// <binding Build='default' />

var del = require('del'),
    gulp = require("gulp"),
    ts = require('gulp-typescript'),
    watch = require('gulp-watch');
... (remaining code)

Answer №1

I had a similar issue too.

To resolve it, I included this snippet at the beginning of the TypeScript file where the import {bootstrap} line is located:

///<reference path="../node_modules/angular2/typings/browser.d.ts"/>

Keep in mind that the path may vary depending on your specific file structure.

Answer №2

To bypass type checking in declaration files (*.d.ts), simply include the skipLibCheck property with a value of true in your tsconfig.json:

{
  "compilerOptions": {
    [...]
    "skipLibCheck": true
  },
  "include": ["./src/**/*.*"],
  "exclude": [
    "node_modules"
  ]
}

This setting will help you avoid type checking errors when working with external libraries.

Credit to the original source

Answer №3

To ensure compatibility with ES5, insert "node_modules/typescript/lib/lib.es6.d.ts" into the tsconfig.json configuration file:

{
    "compilerOptions": {
        "module": "commonjs",
        "target": "es5",
        "noImplicitAny": false,
        "outDir": "built",
        "rootDir": ".",
        "sourceMap": false
    },
    "files": [
      "helloworld.ts",
      "node_modules/typescript/lib/lib.es6.d.ts"
    ],
    "exclude": [
        "node_modules"
    ]
}

Answer №4

When attempting to solve this issue

/// <reference path="../typings/browser.d.ts" />
import {bootstrap} from 'angular2/platform/browser';
import {AppComponent} from './app/main';

bootstrap(AppComponent);

Although the previous method works effectively, I personally prefer including typings file directly within the gulpjs task instead of cluttering the source file with comments. An alternative approach would be like this:

gulp.task('typescript', function () {
  return gulp
    .src([
      'typings/browser.d.ts',
      tsSrc + '**/*.ts'
    ])
    .pipe(sourcemaps.init())
    .pipe(typescript(tscConfig.compilerOptions))
    .pipe(sourcemaps.write('.'))
    .pipe(gulp.dest(appSrc + 'js/'));
});

Answer №5

During the RC1 demonstration, the shim is supplied by the core-js module and type definitions are managed using the typings tool. To resolve any issues, simply include typings/index.d.ts in the gulp.src code snippet:

function compileTypeScript(files) {
  files = files || ['app/**/*.ts','typings/index.d.ts'];

  return function () {
    var tsResult = gulp.src(files)
        .pipe(changed(paths.dirs.build, { extension: '.js' }))
        .pipe(ts(tscConfig.compilerOptions));

    return merge(tsResult.dts, tsResult.js)
        .pipe(gulp.dest(paths.dirs.build));
  }
}

gulp.task('typescript', compileTypeScript());

Answer №6

I encountered a similar issue, and found that running the application using "npm run lite" instead of "npm start" provided a more streamlined experience. Give it a try!

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