Add gegl:plasma.

source/gegl/exports.ts

@@ -4,6 +4,7 @@ export * from './focus-blur.js';
 export * from './generic.js';
 export * from './mirrors.js';
 export * from './newsprint.js';
+export * from './plasma.js';
 export * from './simplex-noise.js';
 export * from './softglow.js';
 export * from './stereographic-projection.js';

source/gegl/plasma.ts

@@ -0,0 +1,32 @@
+import {BaseOperation} from './base.js';
+
+export interface PlasmaParameters {
+  height: number;
+  seed: number;
+  turbulence: number;
+  width: number;
+  x: number;
+  y: number;
+}
+
+export class Plasma extends BaseOperation<PlasmaParameters> {
+  public static default: PlasmaParameters = {
+    height: 768,
+    seed: 0,
+    turbulence: 1,
+    width: 1024,
+    x: 0,
+    y: 0,
+  };
+
+  public get default() {
+    return Plasma.default;
+  }
+
+  public appendCrop = false;
+  public name = 'gegl:plasma';
+
+  constructor(parameters?: Partial<PlasmaParameters>) {
+    super({...Plasma.default, ...parameters});
+  }
+}