Simplify/modernize test run and code coverage calculations.

.travis.yml

@@ -4,9 +4,10 @@ node_js:
 before_script:
   - npm install
 script:
-  - gulp test
-  - gulp lint
-  - gulp coveralls
+  - npm run test
+  - npm run lint
+after_success:
+  - npm run coverage
 cache:
   directories:
     - "node_modules"

README.md

@@ -249,4 +249,4 @@ Array mutations **can** be observed through the use of the array mutation method
 
 ## Contributing
 
-Contributions are most welcome! Please be sure to run `gulp test` and `gulp lint` against your code before submitting a pull request.
+Contributions are most welcome! Please be sure to run `npm run test` and `npm run lint` against your code before submitting a pull request.

gulpfile.js

@@ -1,31 +1,10 @@
-const process = require('process');
-const path = require('path');
 const gulp = require('gulp');
 const uglify = require('gulp-uglify-es').default;
 const useref = require('gulp-useref');
 const rename = require('gulp-rename');
-const mocha = require('gulp-mocha');
 const babel = require('gulp-babel');
-const eslint = require('gulp-eslint');
-const shell = require('gulp-shell');
 
-const observableSlimPath = './observable-slim.js';
-const proxyPath = './proxy.js';
-const testPath = './test/test.js';
-const coverallsCoverageDirPath = './coverage';
-const coverallsCoverageLcovPath = `${coverallsCoverageDirPath}/lcov.info`;
-const coverallsBinPath = './node_modules/coveralls/bin/coveralls.js';
-const coverallsCommand = (process.platform === 'win32')
-// Windows (we have to resolve the paths).
-	? `nyc report --reporter=lcov`
-	+ ` && type ${path.resolve(coverallsCoverageLcovPath)} | ${path.resolve(coverallsBinPath)}`
-	+ ` && rmdir /s /q ${path.resolve(coverallsCoverageDirPath)}`
-// Linux.
-	: `nyc report --reporter=lcov`
-	+ ` && cat ${coverallsCoverageLcovPath} | ${coverallsBinPath}`
-	+ ` && rm -rf ${coverallsCoverageDirPath}`;
-
-gulp.task('default', (done) => gulp.src([observableSlimPath, proxyPath])
+gulp.task('default', (done) => gulp.src(['./observable-slim.js', './proxy.js'])
 	.pipe(babel({
 		presets: ['@babel/preset-env'],
 		sourceType: 'script' // Prevent insertion of "use strict".
@@ -38,19 +17,3 @@ gulp.task('default', (done) => gulp.src([observableSlimPath, proxyPath])
 	.pipe(gulp.dest('./')) // Write it to the current directory.
 	.on('end', done)
 );
-
-gulp.task('test', (done) => gulp.src([testPath])
-	.pipe(mocha({
-		compilers: babel
-	}))
-	.on('end', done)
-);
-
-gulp.task('coveralls', shell.task([coverallsCommand]));
-
-gulp.task('lint', (done) => gulp.src([observableSlimPath, proxyPath, testPath])
-	.pipe(eslint())
-	.pipe(eslint.format())
-	.pipe(eslint.failOnError()) // Brick on failure to be super strict.
-	.on('end', done)
-);