A extension to add support for imagemin images compression

docs/imagemin.md

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+# RollupJS Extension
+
+**Task Definitions**: _None_<br />
+**Template Definitions**: _['imagemin'](#imagemin-template)_<br />
+**Batcher Definitions**: _None_
+
+Performs compression on images with the default settings from `imagemin-cli`
+
+### Template Options
+
+* `auto-install` (_Boolean_, default: `true`): Whether to automatically install `rollup` if not present (using the [npm extension](npm.md)). The global npm extension `auto-install` option will take precedence here if not otherwise set.
+* `entry` (_String_): List of application entry points.
+* `outdir` (_String_): The build output directory.
+* `plugins` (_String_): Any valid imagemin plugins (eg: `mozjpeg`)
+
+### Example
+
+_chompfile.toml_
+```toml
+version = 0.1
+
+extensions = ['[email protected]:rollup']
+
+[[task]]
+name = 'build:assets'
+deps = ["public/assets"]
+template = 'imagemin'
+[task.template-options]
+plugins = ['mozjpeg']
+entry = 'public/assets'
+```
+
+## Roadmap
+
+This plugin is very simple currently and needs to be extended to support comprehensive Imagemin pipelines and customization options.

imagemin.js

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+Chomp.addExtension("[email protected]:npm");
+
+Chomp.registerTemplate("imagemin", function (task) {
+  const {
+    outdir = "dist",
+    entry,
+    autoInstall,
+    plugins = [],
+  } = task.templateOptions;
+  if (!entry) {
+    throw new Error(`Images entry is mandatory`);
+  }
+
+  const imageminPlugins = plugins.map((plugin) => `imagemin-${plugin}`);
+  const statement = `imagemin ${entry}/* --out-dir=${outdir}/${entry} ${
+    plugins.length > 0
+      ? plugins.reduce((acc, plugin) => {
+          acc = acc + `--plugin=${plugin}`;
+          return acc;
+        }, "")
+      : ""
+  }`;
+
+  return [
+    {
+      name: task.name,
+      deps: [
+        ...task.deps,
+        ...(ENV.CHOMP_EJECT
+          ? ["npm:install"]
+          : [
+              "node_modules/imagemin-cli",
+              /* 
+                While reading through cli imagemin don't need prefix 
+                https://github.com/imagemin/imagemin-cli/blob/main/cli.js#L55 
+              */
+              ...imageminPlugins.map((plugin) => `node_modules/${plugin}`),
+            ]),
+      ],
+      targets: [...new Set([...task.targets])],
+      run: statement,
+    },
+    ...(ENV.CHOMP_EJECT
+      ? []
+      : [
+          {
+            template: "npm",
+            templateOptions: {
+              autoInstall,
+              packages: ["imagemin-cli", ...imageminPlugins],
+              dev: true,
+            },
+          },
+        ]),
+  ];
+});