Error TS2307: TypeScript could not locate the 'moment' module

Currently, I am in the process of developing a web application utilizing angular version 1.5 along with typescript 2.4.0. Additionally, I am integrating moment version 2.18.1 and gulp for handling project assembly.

Here is an excerpt from my tsconfig.json file:

{
  "files": [
    "src/app/main.ts",
    "types/**/*.ts"
  ],
  "compilerOptions": {
    "noImplicitAny": false,
    "target": "es2015",
    "allowSyntheticDefaultImports": true
  }
}

Within my date-range-picker.component.ts, I am importing the moment library as recommended in the primary documentation available at here:

import * as moment from 'moment'; 

This setup works seamlessly with the main project assembly task in gulp that relies on the tsify plugin:

var browserifyIt = browserify({
    basedir: '.',
    debug: true,
    entries: paths.browserifyEntries,
    cache: {},
    packageCache: {}
}).plugin(tsify);

gulp.task('bundle', ['views'], function () {
    return browserifyIt
        .transform('babelify', {
            presets: ['es2015'],
            extensions: ['.ts']
        })
        .bundle()
        .on('error', interceptErrors)
        .pipe(source(fileNames.buildJs))
        .pipe(ngAnnotate())
        .pipe(buffer())
        .pipe(sourcemaps.init({loadMaps: true}))
        .pipe(sourcemaps.write(paths.sourcemapPath))
        .pipe(gulp.dest(paths.build));
});

However, when it comes to compiling tests, I have decided to utilize a task that employs tsProject():

const testSrcPaths = {
    ....,
    componentTests: 'src/app/components/**/*.test.ts',
    ....
};
gulp.task('component-tests:compile', function () {
       return gulp.src(testSrcPaths.componentTests).pipe(tsProject())
        .on('error', interceptErrors)
        .js.pipe(gulp.dest(`${paths.testsDist}/components`));
});

This approach has resulted in the following error message:

date-range-picker/date-range-picker.component.ts(2,25): error TS2307: Cannot find module 'moment'.

How can I go about resolving this issue?

Answer №1

After much trial and error, I finally managed to solve my problem by including moduleResolution: "node" in the compilerOptions. As a result, my updated tsconfig.json configuration looks like this:

{
  "files": [
    "src/app/main.ts"
  ],
  "compilerOptions": {
    "noImplicitAny": false,
    "target": "es2015",
    "moduleResolution": "node"
  }
}

If you want to dive deeper into TypeScript module resolution, feel free to check out this informative link.

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