Add benchmark script for measuring performance

This makes it easier to optimize performance in the future.

See #167

.gitignore

@@ -29,5 +29,6 @@ Thumbs.db
 coverage
 dist
 node_modules
+!scripts/files/node_modules
 !test/bugfix/*/files/node_modules
 !test/files/node_modules

package.json

@@ -11,6 +11,7 @@
     "watch": "lerna run watch",
     "build": "lerna run build",
     "clean": "lerna run clean",
+    "benchmark": "node scripts/benchmark.js",
     "lint": "tslint **/*.ts -e **/node_modules/** -e **/dist/**",
     "coverage": "jest --coverage --maxWorkers=4",
     "coveralls": "npm run coverage && cat coverage/lcov.info | coveralls",

scripts/benchmark.js

@@ -0,0 +1,22 @@
+#!/usr/bin/env node
+const { performance } = require(`perf_hooks`);
+const path = require(`path`);
+const sass = require(`node-sass`);
+
+const magicImporter = require(`../packages/node-sass-magic-importer/dist/index`);
+
+const start = performance.now();
+
+for (let i = 0; i < 100; i += 1) {
+  sass.renderSync({
+    file: `scripts/files/benchmark.scss`,
+    importer: magicImporter({
+      cwd: path.resolve(__dirname, `files`),
+    }),
+  }).css.toString();
+}
+
+const end = performance.now();
+const duration = end - start;
+
+console.log(`Duration: ${duration}ms`)

scripts/files/benchmark.scss

@@ -0,0 +1,5 @@
+@import '~test-package1';
+@import '~test-package2/**/*.scss';
+@import '{ .partial-1-1 as .replaced1 } from partials/_partial*';
+@import '{ .partial-1-2 as .replaced2 } from partials/_partial*';
+@import '{ .partial-1-3 as .replaced3 } from partials/_partial*';

scripts/files/partials/_partial-1.scss

@@ -0,0 +1,11 @@
+.partial-1-1 {
+  content: 'Partial 1-1';
+}
+
+.partial-1-2 {
+  content: 'Partial 1-2';
+}
+
+.partial-1-3 {
+  content: 'Partial 1-3';
+}