three.js/examples/js/shaders/BasicShader.js

( function () {

	/**
 * Simple test shader
 */

	const BasicShader = {
		uniforms: {},
		vertexShader: /* glsl */`

		void main() {

			gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );

		}`,
		fragmentShader: /* glsl */`

		void main() {

			gl_FragColor = vec4( 1.0, 0.0, 0.0, 0.5 );

		}`
	};

	THREE.BasicShader = BasicShader;

} )();