this.installDependencies is not a function

[nazarhussain]

Installing dependencies is any generator is failing.

public install(): void {
    this.installDependencies({ npm: true, bower: false, yarn: false, skipMessage: false });
}

It throws the following error.

(node:58529) UnhandledPromiseRejectionWarning: TypeError: this.installDependencies is not a function
   ......
    at Object.<anonymous> (node_modules/yeoman-generator/lib/index.js:1009:25

This probably caused because the actions/install is not registered to the Generator class.

generator/lib/index.js

Lines 1408 to 1413 in d8dfd10

	// Mixin the actions modules
	_.extend(Generator.prototype, require('./actions/help'));
	_.extend(Generator.prototype, require('./actions/spawn-command'));
	_.extend(Generator.prototype, require('./actions/fs'));
	_.extend(Generator.prototype, require('./actions/package-json'));
	Generator.prototype.user = require('./actions/user');

This above code block is missing.

_.extend(Generator.prototype, require('./actions/install'));

[mshima]

It is not included by default anymore.
https://github.com/yeoman/generator/releases/tag/v5.0.0

[nazarhussain]

Thanks for the information @mshima

[schorfES]

The documentation is not up to date and quite misleading

• https://yeoman.github.io/generator/Generator.html#installDependencies
• https://yeoman.io/authoring/dependencies.html