How to execute gulp.task inside docker?

Question

Node.js

There is a docker file that installs nodejs, copies package.json from the local environment and then installs all dependencies from it (gulp, gulp-cli is installed).

FROM node
COPY scripts .
RUN npm install
EXPOSE 8081

Also copies gulpfile, with a simple task

var gulp = require('gulp');

gulp.task('say', function() {
    console.log('hello');
});

It is not possible to execute this task inside the container, although there is a file and all dependencies are
gulp say
not working, it says in the console that the command was not found

Answer 1

In order for the command to be available to run from the shell, gulp must be installed with the -g (global) switch for npm. Or run like this:
$ node node_modules/.bin/gulp